Thematische Bibliographien / Sr/Nd isotopes

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Auswahl der wissenschaftlichen Literatur zum Thema „Sr/Nd isotopes“

Autor: Grafiati
Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "Sr/Nd isotopes"

1

Jo, Hui Je, Hyo Min Lee, Go-Eun Kim, Won Myung Choi und Taehoon Kim. „Determination of Sr–Nd–Pb Isotopic Ratios of Rock Reference Materials Using Column Separation Techniques and TIMS“. Separations 8, Nr. 11 (10.11.2021): 213. http://dx.doi.org/10.3390/separations8110213.

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Thermal ionization mass spectrometry (TIMS) can provide highly accurate strontium (Sr), neodymium (Nd), and lead (Pb) isotope measurements for geological and environmental samples. Traces of these isotopes are useful for understanding crustal reworking and growth. In this study, we conducted a sequential separation of Sr, Nd, and Pb and subsequently measured the 87Sr/86Sr, 143Nd/144Nd, 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb ratios of 13 widely used rock certified reference materials (CRMs), namely BCR-2, BHVO-2, GSP-2, JG-1a, HISS-1, JLk-1, JSd-1, JSd-2, JSd-3, LKSD-1, MAG-1, SGR-1, and 4353A, using TIMS. In particular, we reported the first isotopic ratios of Sr, Nd, and Pb in 4353A, Sr and Nd in HISS-1 and SGR-1, and Sr in JLk-1, JSd-2, JSd-3, and LKSD-1. The Sr–Nd–Pb isotopic compositions of most in-house CRMs were indistinguishable from previously reported values, although the Sr and Pb isotopic ratios of GSP-2, JSd-2, JSd-3, and LKSD-1 obtained in different aliquots and/or batches varied slightly. Hence, these rock reference materials can be used for monitoring the sample accuracy and assessing the quality of Sr–Nd–Pb isotope analyses.
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Zhang, Bang-Lu, Zhi-Cheng Lv, Zhi-Guo Dong, Xin Zhang, Xiao-Fei Yu, Yong-Sheng Li, Shi-Min Zhen und Chang-Le Wang. „Source Characteristics of the Carboniferous Ortokarnash Manganese Deposit in the Western Kunlun Mountains“. Minerals 12, Nr. 7 (21.06.2022): 786. http://dx.doi.org/10.3390/min12070786.

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The specific source of ancient sedimentary manganese (Mn) deposits is commonly complex. Here we use systematic major and trace element data with strontium (Sr) and neodymium (Nd) isotopic analyses of the Ortokarnash Mn(II) carbonate ores and associated carbonate rocks from the Upper Carboniferous Kalaatehe Formation (ca. 320 Ma) in order to constrain the Mn source. This formation consists of three members: the first member is a volcanic breccia limestone, the second member is a sandy limestone, and the third member is a black marlstone with the Mn(II) carbonate interlayers. Petrographic observations in combination with low Al2O3 (<3.0 wt%) and Hf (<0.40 ppm) contents and the lack of correlations between the Al2O3 and 87Sr/86Sr ratios as well as εNd(t) values demonstrate a negligible influence of terrigenous detrital contamination on both Sr and Nd isotopic compositions of the Mn(II) carbonate ores. The Sr isotopes of Mn(II) carbonate ores are most likely affected by post-depositional alteration, while Nd isotopes remain unaltered. The initial 87Sr/86Sr ratios in the associated carbonate rocks are likely the result of a mixture of the chemical components (i.e., seawater) and the Al-rich components (e.g., volcanoclastic material), while the detrital effects on Nd isotopes are negligible. In addition, both Sr and Nd isotopes in these non-mineralized wall rocks remained unchanged during post-depositional processes. The relatively low Th/Sc ratios and positive εNd(t) values suggest that the aluminosilicate fraction in the calcarenite and sandy limestone was mainly derived from the weathering of a depleted mafic source, representing the riverine input into the seawater. Given that the Mn(II) carbonate ores are characterized by negative εNd(t) values, these suggest that seafloor-vented hydrothermal fluids derived from interaction with the underlying old continental crust mainly contribute to the source of the Mn(II) carbonates.
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PE-PIPER, GEORGIA, und DAVID J. W. PIPER. „Late Cenozoic, post-collisional Aegean igneous rocks: Nd, Pb and Sr isotopic constraints on petrogenetic and tectonic models“. Geological Magazine 138, Nr. 6 (November 2001): 653–68. http://dx.doi.org/10.1017/s0016756801005957.

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Nd isotopic composition has been determined for 16 igneous rocks, representing the wide geochemical, spatial and temporal range of post-collisional, late Cenozoic magmas in the Aegean area. Nd isotopes are used to further interpret previously published Pb and Sr isotope data. The overall pattern of late Cenozoic volcanism resulted from rapid extension, with thermal effects causing melting of hydrated, enriched, subcontinental lithosphere to produce widespread K-rich magmas. Slab break-off and intrusion of hot asthenosphere caused partial melting of rift-related continental margin basalts at the detachment point to generate adakitic magmas. Further outboard, mafic magma from enriched lithospheric mantle melted thickened lower crust to produce the granitoid plutons of the Cyclades. Nd isotopic variation in these varied rock types correlates with pre-Cenozoic palaeo-geography. Proterozoic subduction-related enrichment in Th and U, together with other large-ion lithophile elements, produced distinctive Pb isotope composition. This was later modified where Mesozoic subduction of terrigenous sediment was important, whereas subduction of oceanic carbonate sediments produced enrichment in radiogenic Sr and low Ce/Sr ratios. Late Cenozoic magmas sourced in eastern Pelagonian zone sub-continental lithospheric mantle have Nd model ages of about 1.0 Ga, and generally high 87Sr/86Sr and high 207Pb/204Pb (∼ 15.68) and 208Pb/204Pb (∼ 39.0) for low 206Pb/204Pb (∼ 18.6), but rocks to the west have more radiogenic Pb and higher Ce/Sr as a result of greater subduction of terrigenous sediment from the northern Pindos ocean. Magmas sourced from sub-continental lithosphere beneath the Apulian continental block were strongly influenced by subduction of oceanic crust and sediments north of the passive margin of north Africa. Subduction of Nile-derived terrigenous sediment in the east resulted in Nd model ages of 0.7 to 0.8 Ga and radiogenic Pb isotopes. Greater subduction of oceanic carbonate in the west resulted in magmas with higher 87Sr/86Sr and lower Ce/Sr. The strongly negative εNd for adakites in the central Aegean rules out a source from subducted oceanic basalt, and the adakite magma was probably derived from melting of hydrated Triassic sub-alkaline basalt of continental origin. Where trachytic rocks are succeeded by nepheline-normative basalts (e.g. Samos), Nd isotope data imply that early partial melting of the enriched subcontinental lithospheric mantle involved hydrous amphibole and phlogopite, but once these minerals were consumed, younger magmas were produced by partial melting dominated by olivine and orthopyroxene.
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Alatarvas, Raisa, Ninna Immonen und Kari Strand. „Clay mineral and Nd, Pb, and Sr isotope provenance of a MIS 4-3 sediment record from the Lomonosov Ridge, central Arctic Ocean“. Bulletin of the Geological Society of Finland 95, Nr. 1 (22.06.2023): 35–46. http://dx.doi.org/10.17741/bgsf/95.1.003.

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Modern techniques for detrital mineral provenance were applied to sediment core 96/12-1pc from the Lomonosov Ridge in the central Arctic Ocean. The techniques include quantitative clay mineralogy analysis combined with determination of Nd, Pb, and Sr isotopes from clay fraction. The clay mineral assemblage and the isotope signatures depict distinct changes during the Marine Isotope Stage (MIS) 4-3 transition corresponding to the Middle Weichselian deglaciation. This transition is characterised by a homogenous, 48 cm thick, dark grey, silty clay layer with a distinctive IRD concentration, forming a prominent marker bed for the central Arctic Ocean sediments. The elevated smectite and kaolinite contents in the transitional interval are possible weathering products of the Siberian basaltic rocks, such as the Putorana Plateau, feeding the shelves of the Kara Sea and the western Laptev Sea. The Nd and Sr isotope values are compatible with input from the basaltic rocks and fall within the isotopic range of sediments from these shelves. The abrupt changes in the Nd, Pb and Sr isotopic data from the distinct grey layer attributed to the MIS 4-3 transition likely mark a pronounced deglaciation event. An increase in coarse debris in the grey layer indicates a change in the sedimentation regime with a strong iceberg rafting component. This change may also be related to a sudden release of meltwater from a large ice-dammed lake in the northern Siberia.
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Jin, Luying, Kezhang Qin, Guangming Li, Junxing Zhao, Zhenzhen Li, Zhuyin Chu und Guoxue Song. „Formation of the Chalukou High Fluorine-Type Mo (–Zn–Pb) Deposit, NE China: Constraints from Fluorite and Sphalerite Rare Earth Elements and Sr–Nd Isotope Compositions“. Minerals 13, Nr. 1 (03.01.2023): 77. http://dx.doi.org/10.3390/min13010077.

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Fluorite is a widespread mineral in porphyry and hydrothermal vein Mo-polymetallic deposits. Here, fluorite is utilised as a probe to trace the fluid source and reveal the fluid evolution process in the Chalukou giant Mo (Pb‒Zn) deposit, Northeast China, which is characterised as early porphyry Mo and later vein-style Zn–Pb mineralisation. A detailed rare earth element (REE) and Sr–Nd isotope study of fluorite combined with Sr isotopes of sphalerite is conducted for the Chalukou deposit. The chondrite-normalised REE patterns of fluorites from molybdenite veins show light REE (LREE)-enriched patterns, with negative Eu anomalies (δEu = 0.60) and weakly negative Y anomalies (Y/Y* = 0.72). The fluorites associated with sphalerite veins exhibit rare earth element (REE)-flat patterns with negative Eu anomalies (δEu = 0.65 to 0.99) and positive Y anomalies (Y/Y* = 1.37 to 3.08). In addition, during the progression from Mo to Zn–Pb mineralisation, the total concentration of REEs decreases from 839 ppm to 53.7 ppm, and Y/Ho ratios increase from 22.1 to 92.5. These features may be explained by the different mobilities of REE complexes during fluid migration. The Eu anomalies are considered to be inherited from source fluids. All the initial 87Sr/86Sr ratios of fluorite and sphalerite are between those of ore-forming porphyries and wall rocks (rhyolite), with fluorite ratios ranging from 0.706942 to 0.707386 and sphalerite ratios varying from 0.705221 to 0.710417. The majority of εNd(t) values of fluorite varying from −6.4 to −3.6 are also located between the ratios exhibited by ore-forming porphyries and rhyolite, whereas three εNd(t) values of fluorites ranging from −0.26 to 0.36 are close to those of ore-forming porphyries. All the isotopic features indicate that the Sr-Nd isotope ratios of hydrothermal fluid are derived from porphyries and disturbed by fluid–rock reactions. Together with a two-stage Sr–Nd isotope mixing model, we suggest that different sources and fluid‒rock interactions (syn-ore intrusions and strata) finally influence the Sr–Nd isotopes of the ore-forming fluids, which are recorded by the majority of fluorite and sphalerite.
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Linghu, Miaomiao, Zimu Li, Jinfeng Sun und Jiheng Zhang. „Magma Source and Petrogenesis of the Early Cretaceous Granites in The Liaodong Peninsula: Evidence from In Situ Apatite Sr-Nd and Zircon Hf-O Isotopes“. Minerals 13, Nr. 4 (12.04.2023): 545. http://dx.doi.org/10.3390/min13040545.

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Apatite Sr-Nd and zircon Hf-O isotopes are broadly used to trace magma sources and constrain magma evolution processes, further improving our understanding of the origin of granitoids. We present zircon U-Pb ages, whole-rock major and trace elements, and whole-rock Sr-Nd-Hf, zircon Hf-O, and apatite Sr-Nd isotopic data for the coarse-grained quartz monzonite, biotite monzogranite, and granite porphyry in the Yushulinzi pluton in the Liaodong Peninsula, the eastern North China Craton, to establish their magma sources and petrogenesis. The coarse-grained quartz monzonite, biotite monzogranite, and granite porphyry were formed contemporaneously, with zircon U-Pb ages of 123–119 Ma. They share enriched whole-rock Sr-Nd-Hf and zircon Hf isotopic compositions, and the coarse-grained quartz monzonite has crust-like δ18O values (5.7–6.7‰). The coarse-grained quartz monzonite and biotite monzogranite have variable apatite (87Sr/86Sr)i ratios and negative apatite εNd(t) values. These isotopic characteristics indicate that the different rock types in the Yushulinzi pluton were derived from the partial melting of ancient crustal material in the North China Craton. Their geochemical and petrographic characteristics indicate that the crystal-melt segregation model can be employed to elucidate the genetic links among different rock types, with the coarse-grained quartz monzonite representing crystal accumulation and the biotite monzogranite and granite porphyry representing interstitial melts extracted from a crystal-rich magma chamber. Furthermore, the variable apatite Sr isotopic compositions and subtle differences in the peak zircon εHf(t) values of the studied rock samples confirm the possibility of a contribution from shallow crustal components and materials with high εHf(t) values during magma evolution, which is not readily revealed by their whole-rock Sr-Nd-Hf isotopic compositions. These results demonstrate that in situ apatite Sr-Nd and zircon Hf-O isotopic analyses have the potential to provide distinctive insights into the magma sources and evolution of magmatic systems.
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Bonev, Nikolay, Zornitsa Dotseva und Massimo Chiaradia. „Comparative Nd-Sr-Pb isotopes geochemistry of the eastern Circum-Rhodope belt ophiolitic mafic suites, Greece-Bulgaria“. Review of the Bulgarian Geological Society 83, Nr. 3 (Dezember 2022): 69–72. http://dx.doi.org/10.52215/rev.bgs.2022.83.3.69.

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We report on the isotopic compositions of the Jurassic supra-subduction zone Evros ophiolite mafic rocks exposed in the eastern Circum-Rhodope Belt in the Thrace region of northeastern Greece. These mafic units consist of low-Ti gabbroic and basaltic rocks, which Nd-Sr-Pb isotopes are compatible with dominant mantle-derived Mid-Ocean Ridge Basalt (MORB) component mixed with a detectable amount of crustal material and/or sediment involved in their melt source in the subduction zone. These isotopic features are consistent with an intra-oceanic arc origin of the mafic ophiolite rocks, and the Evros ophiolite Nd and Pb isotopes are comparable to those of the counterpart mafic rocks from the Mandritsa Unit in the eastern Rhodope Massif of southern Bulgaria.
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He, Jun, Xiaochun Xu, Zhongyang Fu, Yuhua An, Tianhu Chen, Qiaoqin Xie und Fukun Chen. „Decoupling of Sr-Nd Isotopic Composition Induced by Potassic Alteration in the Shapinggou Porphyry Mo Deposit of the Qinling–Dabie Orogenic Belt, China“. Minerals 11, Nr. 8 (23.08.2021): 910. http://dx.doi.org/10.3390/min11080910.

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In our previous study on petrogenesis of quartz syenite and granite porphyry, the host rocks of the Late Mesozoic Shapinggou Mo deposit in the Qinling–Dabie orogenic belt, we found that the initial Sr isotopic composition of the host rocks is strongly affected by the degree of K-alteration. Here, we provide further isotopic evidence of the host rocks and their minerals to investigate the geochemical behaviour of trace elements and isotopes during the alteration and to explain the phenomenon of decoupling of Sr–Nd isotopic composition. The quartz syenite and granite porphyry are altered by K-alteration in varying degrees and have high K2O and Rb contents and low Na2O, CaO, Sr, and Ba contents. Rock samples of both quartz syenite and granite porphyry have variable Rb/Sr ratios and initial 87Sr/86Sr values (even < 0.70) but contain quite homogeneous εNd(t) values (−12.8 to −14.8). Minerals from the rocks of moderate to intense K-alteration have very low initial 87Sr/86Sr values (even < −17), while those from the weakly altered rocks have 87Sr/86Sr(t) values of 0.7044 to 0.7084. The same phenomenon of the decoupling in Sr–Nd isotopic composition can be observed from several Mo deposits within the eastern Qinling–Dabie orogenic belt. This fact suggests similar hydrothermal features and a comparable origin for both the magmatic rocks and hydrothermal fluids in this belt. A comparison between porphyry Mo and porphyry Cu deposits shows that elements and the Rb–Sr isotope system have different behaviours during the K-alteration, implying distinct material sources and igneous rocks for porphyry Mo and porphyry Cu deposits, respectively.
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Hindshaw, Ruth S., Nicholas J. Tosca, Alexander M. Piotrowski und Edward T. Tipper. „Clay mineralogy, strontium and neodymium isotope ratios in the sediments of two High Arctic catchments (Svalbard)“. Earth Surface Dynamics 6, Nr. 1 (05.03.2018): 141–61. http://dx.doi.org/10.5194/esurf-6-141-2018.

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Abstract. The identification of sediment sources to the ocean is a prerequisite to using marine sediment cores to extract information on past climate and ocean circulation. Sr and Nd isotopes are classical tools with which to trace source provenance. Despite considerable interest in the Arctic Ocean, the circum-Arctic source regions are poorly characterised in terms of their Sr and Nd isotopic compositions. In this study we present Sr and Nd isotope data from the Paleogene Central Basin sediments of Svalbard, including the first published data of stream suspended sediments from Svalbard. The stream suspended sediments exhibit considerable isotopic variation (εNd = −20.6 to −13.4; 87Sr ∕ 86Sr = 0.73421 to 0.74704) which can be related to the depositional history of the sedimentary formations from which they are derived. In combination with analysis of the clay mineralogy of catchment rocks and sediments, we suggest that the Central Basin sedimentary rocks were derived from two sources. One source is Proterozoic sediments derived from Greenlandic basement rocks which are rich in illite and have high 87Sr ∕ 86Sr and low εNd values. The second source is Carboniferous to Jurassic sediments derived from Siberian basalts which are rich in smectite and have low 87Sr ∕ 86Sr and high εNd values. Due to a change in depositional conditions throughout the Paleogene (from deep sea to continental) the relative proportions of these two sources vary in the Central Basin formations. The modern stream suspended sediment isotopic composition is then controlled by modern processes, in particular glaciation, which determines the present-day exposure of the formations and therefore the relative contribution of each formation to the stream suspended sediment load. This study demonstrates that the Nd isotopic composition of stream suspended sediments exhibits seasonal variation, which likely mirrors longer-term hydrological changes, with implications for source provenance studies based on fixed end-members through time.
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Huang, Chao, Yue-Heng Yang, Jin-Hui Yang und Lie-Wen Xie. „In situ simultaneous measurement of Rb–Sr/Sm–Nd or Sm–Nd/Lu–Hf isotopes in natural minerals using laser ablation multi-collector ICP-MS“. Journal of Analytical Atomic Spectrometry 30, Nr. 4 (2015): 994–1000. http://dx.doi.org/10.1039/c4ja00449c.

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This study presents a combined methodology of simultaneously measuring Rb–Sr/Sm–Nd or Sm–Nd/Lu–Hf isotopes in natural minerals by a means of two multiple collector inductively coupled plasma mass spectrometers connected to a 193 nm excimer laser ablation system.
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Dissertationen zum Thema "Sr/Nd isotopes"

1

Bayon, Germain. „An investigation into ND and SR isotopes in marine sediments and their application to paleoceanography“. Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250079.

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Partey, Frederick Kenneh. „SOURCE OF FLUORINE AND PETROGENESIS OF THE RIO GRANDE RIFT TYPE BARITE-FLUORITE-GALENA DEPOSITS“. Miami University / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=miami1092262697.

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Munier, Thomas. „Évolution des conditions d’altération et des paléoclimats au cours de l'intervalle Albien-Santonien (113-83 Ma) : apports des minéraux argileux et de la géochimie“. Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS156.pdf.

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L’intervalle Albien-Santonien (~113-83 Ma) est une période charnière dans l’histoire du Crétacé. Cet intervalle est caractérisé par un fort taux de production de croûte océanique, associée à la dislocation de la Pangée et par une activité importante des provinces magmatiques. Ces conditions engendrent une augmentation notable de la pCO2 (Arthur et al., 1985) et une hausse progressive des températures océaniques jusqu’au maximum thermique mi-Crétacé, enregistré à la limite Cénomanien/Turonien (~94 Ma). Ce maximum thermique est suivi, dès la fin du Turonien, par une baisse des températures et de la pCO2 (Linnert et al., 2014). La diminution du volcanisme, une production carbonatée accrue et un stockage de carbone organique important lors de l’événement océanique anoxique OAE 2 à la limite Cénomanien-Turonien participent à la diminution du CO2. Néanmoins l’altération des silicates peut également jouer un rôle dans cette baisse. L’étude de nouveaux forages, réalisés dans le cadre de la mission IODP 369 sur les marges sud et sud-ouest de l’Australie, couplés à d’anciens forages, obtenus lors des missions ODP 122 et 123 sur la marges nord-ouest, nous a permis d’étudier l’évolution des conditions d’altération durant cet intervalle aux moyennes et hautes latitudes dans une zone peu étudiée jusqu’à présent. Une étude détaillée, basée sur la minéralogie des argiles a été réalisée sur six sites dans le bassin de la Grande Baie (site U1512), le bassin Mentelle (sites U1513 et U1516), le bassin Carvarnon (sites 763 et 766) et la plaine abyssale d’Argo (site 765). Sur trois des sites étudiés (U1512, U1513 et 763), des observations au MEB et au MET et des analyses géochimiques (isotopie du Sr et du Nd, concentrations en éléments majeurs et traces) ont complété cette étude. Ces nouvelles données ont été comparées aux nombreux travaux déjà réalisés dans l’océan Atlantique et le domaine péri-téthysien. Au cours de l’intervalle Albien-Turonien, les assemblages de minéraux argileux sont caractérisés par une augmentation des proportions de smectites, observée sur l’ensemble des régions étudiées. Cette augmentation résulte de la combinaison de paramètres globaux et locaux. La stabilisation tectonique des marges africaines et nord-américaines réduit l’altération physique, ce qui entraine une diminution des proportions d’illites et de chlorites, et permet la mise en place de processus pédogénétiques favorisant la formation de smectites. L’altération préférentielle des roches volcaniques dès la fin du Cénomanien, mise en évidence par les mesures isotopiques du Sr et du Nd sur certains sites au large de l’Australie (U1513), entraine également une augmentation des smectites. Enfin, la hausse du niveau marin, enregistrée de l’Albien au Turonien inférieur et associé à un enrichissement en smectites, témoigne de l’influence de la sédimentation différentielle sur les cortèges argileux. L’intervalle Cénomanien/Turonien, caractérisé par une augmentation des kaolinites aux basses et moyennes latitudes de l’hémisphère nord, est marqué par des conditions plus hydrolysantes. Ces kaolinites sont abondantes dans les secteurs soumis aux contraintes tectoniques à la fin du Crétacé inférieur (Aptien-Albien). Ainsi, malgré un climat favorable à leurs formations, l’absence de ces kaolinites dans l’hémisphère sud caractérise l’influence de la topographie et la nécessité de bonnes conditions de drainage pour former ces argiles. L’intervalle Albien-Santonien est ainsi caractérisé par une intensification de l’altération chimique qui culmine au moment du maximum thermique mi-Crétacé. Cette hausse des conditions d’hydrolyse, découplée de l’altération physique, parait néanmoins insuffisante pour faire diminuer la pCO2 lors de ce maximum thermique. Il apparait alors que, malgré un climat favorable à l’hydrolyse, le haut niveau marin et l’aplanissement des masses continentales inhibent l’altération chimique des silicates qui ne tient plus son rôle de puits de CO2
The Albian-Santonian interval (~113-83 Ma) is a key period in Cretaceous history. This interval is characterised by a high seafloor spreading rate, related to the breakup of Pangea, and by a significant activity of large igneous provinces, which generate an increase in pCO2 (Arthur et al., 1985). These conditions lead to a progressive temperature increase until the mid-Cretaceous thermal maximum, recorded at the Cenomanian/Turonian boundary (~94 Ma). This latter is followed from the late Turonian by a decline in temperature and pCO2 (Linnert et al., 2014; Wang et al., 2014). A decrease of volcanic activity, an increase of carbonate production, and an enhanced organic carbon storage during the anoxic oceanic event OAE 2 (Cenomanian-Turonian boundary) are frequently cited to explain the pCO2 decline. However, silicate weathering can also be involved as a triggered mechanism for this decrease. The analyse of new boreholes, drilled during the IODP Leg 369 on the southern and southwestern margins of Australia, coupled with some old boreholes of the ODP Legs 122 and 123 on the northwestern margin, allowed us to investigate the evolution of weathering conditions during this interval at the middle and high latitudes in a poorly studied sector. A detailed work, based on clay mineralogy, has been done on six sites located in the Great Bay Basin (Site U1512), in the Mentelle Basin (sites U1513 & U1516), in the Carnarvon Basin (sites 763 & 766) and the Argo Abyssal Plain (Site 765), respectively. For 3 sites (U1512, U1513 and 763), these studies have been completed by SEM and TEM observations and geochemical analyses (Sr and Nd isotopic ratios and concentrations of major & trace elements). These new data have been compared to the several studies, already done in the Atlantic Ocean and in the peri-Tethyan domain. During the Albian-Turonian interval, the clay mineral assemblages are characterised by an increase in smectite proportions, observed over all the studied regions. This increase results from a combination of global and local parameters. The tectonic stabilisation of the African and North American margins reduces the physical weathering, which leads to a decrease in illite and chlorite proportions, and permits the implementation of pedogenetic processes, which favours the formation of smectites. The preferential weathering of volcanic rocks from the end of the Cenomanian, highlighted by Sr and Nd isotopic measurements on some sites of Australia (U1513) or Africa (959) margins, also results in a relative increase of smectites. Finally, the sea level rise, recorded from the Albian to the Lower Turonian and associated with an enrichment in smectites, highlights the influence of the differential settling process on clay assemblages. The Cenomanian-Turonian interval, characterised by an increase in the proportions of kaolinites at the low and middle latitudes of the Northern Hemisphere, is interpreted as marked by more hydrolysing conditions. These kaolinites are present only in sectors, where tectonic was active at the end of the Early Cretaceous (Aptian-Albian). Thus, despite a climate favourable to their formation, the absence of kaolinites in favour of smectites in the Southern Hemisphere characterizes the influence of topography and good drainage conditions to form these minerals. The Albian-Santonian interval is thus characterised by an increase in chemical weathering that was maximal at the mid-Cretaceous thermal maximum. Nevertheless, this increase in hydrolysing conditions, associated to the denudation of the continental landmasses, seems to be insufficient to cause the pCO2 decrease during this thermal maximum. It appears then, despite a climate favourable for hydrolysis, high sea level and flattening of the continental masses prevent the chemical weathering of silicates which cannot regulate pCO2
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Lahd, Geagea Majdi. „Caractérisation chimique et isotopique des aérosols organiques/inorganiques et détermination de l'impact de la pollution atmosphérique sur l'environnement urbain“. Université Louis Pasteur (Strasbourg) (1971-2008), 2007. http://www.theses.fr/2007STR1GE14.

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Des écorces d'arbres et des aérosols ont été analysés pour déterminer la pollution par les métaux dans l'environnement urbain en utilisant les isotopes. Cette étude s'est focalisée sur trois aspects: 1) La composition isotopique du fond "naturel" dans la vallée du Rhin, les montagnes des Vosges et les Alpes Centrales (Suisse). 2) Les caractéristiques des terres rares et des isotopes du Pb, Sr, Nd des émissions d'une aciérie. 3) Le traçage des émissions industrielles dans un environnement urbain en utilisant les isotopes de Pb, Sr et Nd. Les poussières provenant des principales sources de pollution (incinérateurs, centrale thermique, aciérie) et les suies provenant des voitures et des bateaux ont été analysées. Les sources industrielles montrent des valeurs en εNd et en 87Sr/86Sr bien variables. Les aérosols collectés dans le centre urbain de Strasbourg montrent l'influence des différentes sources industrielles et naturelles
The aim of this study was to determine the heavy metal pollution in the urban environment of Strasbourg and Kehl with help of isotopes. This study focused on three aspects: 1) The « natural » background isotopic composition in the Rhine Valley, Vosges Mountains and the Central Swiss Alps. 2) The REE characteristics and Pb, Sr and Nd isotopic compositions of steel plant emissions. 3) Tracing of industrial aerosol sources in an urban environment using Pb, Sr and Nd isotopes. Filter dust of the principal pollutant sources (waste incinerators, thermal power plant, and steel plant) and soot of car and ship exhaust have been analyzed. The industrial sources have variable εNd values and 87Sr/86Sr ratios. PM10 collected in the urban centre of Strasbourg show the influence of different industrial and natural sources
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Wei, Ran [Verfasser]. „Application of Sr-Nd-Pb isotopes to the late quaternary paleoceanography of the Atlantic Ocean / Ran Wei“. Mainz : Universitätsbibliothek Mainz, 2016. http://d-nb.info/1120442559/34.

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Moragues, Quiroga Cristina. „Water mixing processes in the critical zone : evidence from trace elements and Sr-Nd-Pb-U isotopes“. Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAH002.

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Les fonctions hydrologiques de captage, stockage et rejet d’eau ont des signatures géochimiques dans les cours d'eau reflétant énormément celles trouvées dans les compartiments de la zone critique. Ces signatures sont fortement contrôlées par des processus bio-géophysico-chimiques produits dans l'interface régolite-plante. Jusqu'à présent, les recherches sur régolithes et processus hydrologiques sont restées largement découplées - conduisant à une utilisation généralisée de traceurs non conservateurs d'origines multiples, bloquant ainsi notre capacité à identifier les sources et les voies d'écoulement d’eau. Nous étudions ici le mélange d'eau dans la subsurface à travers un portefeuille unique de traceurs (éléments traces et isotopes O-H-Sr-Nd-Pb-U) permettant d'étudier les processus d'évolution du régolithe et le transport des solutés dans la zone critique. Nous signalons l'intérêt de cette approche pour renforcer la caractérisation des sources et voies d'écoulement d’eau
Catchment hydrological functions of water collection, storage and release have geochemical signatures in stream water largely mirroring those found in critical zone compartments. These signatures are strongly controlled by the different bio-geo-physico-chemical processes that occur within the regolith-plant interface. Until now, investigations into the critical zone’s regolith and hydrological processes research have largely remained uncoupled –leading to a widespread use of non-conservative tracers with multiple origins and thereby stymieing our capability for identifying water pools and flow paths. Here we study the mixing of water in the subsurface through a unique portfolio of complementary groups of tracers (trace elements O-Hand Sr-Nd-Pb-U isotopes) which enables investigating regolith evolution processes and solutes transport within the critical zone. We report the interest of this approach to strengthen water flowpaths and end-members characterization
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Meng, Qing. „Geochemistry and Sr-Nd-Pb-Os isotope systematics of peridotites from the Sulu ultrahigh-pressure metamorphic belt, Eastern China“. Miami University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1250045812.

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Romeur, Monique, und René Maury. „Séries magmatiques arc et arrière-arc de la Sonde : nature des sources impliquées (éléments en trace et isotopes Sr-Nd-Pb)“. Brest, 1991. http://www.theses.fr/1991BRES2006.

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Les volcans quaternaires arriere-arc de java presentent une importante variabilite dans la composition petrologique de leurs produits et dans leur distance par rapport a la fosse. Les laves des ces volcans montrent des caracteristiques en elements en trace typiquement orogeniques, compatibles avec une origine liee a la subduction. Elles ont des compositions isotopiques pb et sr un peu plus faibles que celles des magmas d'arc; les compositions isotopiques du nd sont similaires dans les deux types de magma. Deux correlations compositions isotopiques du nd-rapports th/ta sont mises en evidence: l'une comprend les laves arriere-arc; la seconde les magmas d'arc. A l'aide de ces correlations, trois zones geochimiques ont ete reconnues: un domaine arc, un domaine arriere-arc et un domaine intermediaire comprenant les volcans situes geographiquement entre l'axe de l'arc et les volcans arriere-arc. On propose que les magmas d'arc resultent du melange entre une source murb appauvri (comportant les caracteristiques dupal) et les fluides issus de la plaque subductee. Un melange entre un manteau morb enrichi en elements hygromagmaphiles (contamine par la fusion de croute oceanique subductee, sumatra) et les sediments subductes (par l'intermediaire de fluides metasomatiques) (java) genere les magmas arriere-arc. Les magmas intermediaires sont le resultat d'un melange entre les sources des domaines arc et arriere-arc. Un modele de repartition de ces sources est propose: il est compatible avec la remontee d'un manteau enrichi (domaine arriere-arc) dans un manteau appauvri superficiel (domaine arc)
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Marques, Rodson de Abreu. „Litogeoquímica, geocronologia (U-Pb) e geoquímica isotópica (Sr-Nd) dos granitoides do Domínio Cambuci (Faixa Ribeira) na região limítrofe dos Estados do Rio de Janeiro e Espírito Santo“. Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8830.

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Conselho Nacional de Desenvolvimento Científico e Tecnológico
Os granitoides do Domínio Cambuci, na região limítrofe entre os estados do Rio de Janeiro e Espírito Santo, foram separados em quatro principais grupos: (1) Complexo Serra da Bolívia (CSB) - Ortogranulitos e Ortognaisses Heterogêneos; Ortognaisse Cinza Foliado; e charnockitos da Região de Monte Verde (2) Leucogranitos/leucocharnockitos gnaissificados da Suíte São João do Paraíso (SSJP) (3) Granito Cinza Foliado (4) Leucogranito isotrópico. O CSB é caracterizado pelo magmatismo de caráter calcioalcalino do tipo I, oriundo em ambiente de arco vulcânico (Suíte Monte Verde) e retrabalhamento crustal (ortogranulitos leucocráticos). O Ortogranulito esverdeado fino, é considerado no presente estudo como rocha do embasamento para o Terreno Oriental, cristalizada durante o paleoproterozoico - Riaciano (2184,3 21 Ma) e recristalizada durante o evento metamórfico Brasiliano no neoproterozoico - Edicariano (607,2 1,5 Ma), cuja idade TDM é de 2936 Ma. O Ortogranulito leucocrático médio cristalizou-se no neoproterozoico Edicariano (entre 592 e 609 Ma) e idade TDM ca. 2100 Ma, ao qual apresenta registro de herança no paleoproterozoico. A Suíte Monte Verde caracteriza-se por um magmatismo calcioalcalino e a Suíte Córrego Fortaleza, por um magmatismo calcioalcalino de alto K, ambas com assinatura de arco magmático. Registram dois pulsos magmáticos, em no Neoproterozoico - Edicarano: um em 592 2 Ma, idade do charnoenderbito, com idade TDM 1797 Ma, e outro em 571,2 1,8 Ma (injeção de um charnockitoide). Para todas as rochas do CSB são registradas feições protomiloníticas, miloníticas e localmente ultramiloníticas. Os dados geoquímicos indicam que os granitoides da SSJP são da série calcioalcalina de alto K, gerados no Neoproterozoico (idades que variam desde 610,3 4,7 Ma até, 592,2 1,3 Ma. As idades TDM revelam valores discrepantes para duas amostras: 1918 Ma e 2415 Ma, sugerindo que tenham sido geradas de diferentes fontes. O Granito Cinza Foliado é da Série Shoshonítica, metaluminoso do tipo I e, de ambiência tectônica de granitos intraplaca. Entretanto, poderiam ter sido fomados em ambiente de arco cordilheirano, havendo contaminação de outras fontes crustais. Fato este pode ser confirmado pelas as idades TDM calculadas ≈ 1429 1446 Ma. O Leucogranito isotrópico ocorre em forma de diques de direção NW, possui textura maciça e é inequigranular. Dados geoquímicos revelam que são granitoides metaluminosos do tipo I da série shoshonítica, e, de acordo com a ambiência tectônica, são granitos intraplaca. O Leucogranito Isotrópico representa o magmatismo pós-colisional ao qual ocorreu entre 80 a 90 Ma de anos após o término do evento colisional na região central da Faixa Ribeira. O Leucogranito Issotrópico cristalizou-se no cambriano (512,3 3,3 Ma e 508,6 2,2 Ma) e com idades TDM ca. 1900
The granitoids of Cambuci Domain, situated between Rio de Janeiro and Espírito Santo states, were divided into four main groups: (1) Serra Bolivia Complex (CSB) - Heterogeneous Orthogranulites and Orthogneisses; Grey Fine grained Orthogneiss; and charnockites of Monte Verde Region (2) leucogranites / leucocharnockites gness of the São João do Paraíso Suite (SSJP) (3) Grey Foliated Granite (4) Isotropic Leucogranite. The CSB is characterized by type I calc character of magmatism, generate in volcanic arc environment (Monte Verde Suite) and crustal reworking (Leucocratic ortogranulites). The Fine grained Greenish, is considered in this research as the embasement rock for the Oriental Terrain, crystallized during the Paleoproterozoic - Riacian (2184.3 21 Ma) and recrystallized during in the metamorphic event in the Neoproterozoic - Edicarian (607.2 1.5 Ma), whose TDM age is 2936 Ma. The Medium grained Leucocratic Ortogranulite was crystallized in the Neoproterozoic - Edicarian (between 592 and 609 Ma) and its TDM age is ca. 2100 Ma, which features heritage record in the Paleoproterozoic. The Monte Verde Suite is characterized by a magmatism calcialcalin and the Córrego Fortaleza Suite, magmatism calc-alkaline high K, both show magmatic arc signature. Records two magmatic pulses in a sample (JP-RM-08A) in the Neoproterozoic - Edicaran: the first one in 592 2 Ma, and TDM age 1797 Ma, and the second one in 571.2 1.8 Ma (injecting a charnockitoids). For all CSB rocks, protomylonítics, Mylonitic and locally ultramilonítics features were portrayed. Geochemical data show these SSJP granitoids are the calc-alkaline series of high-K, crystallyzed in Neoproterozoic (ranging from 610.3 4.7 Ma to 592.2 1.3 Ma). TDM ages show outliers in two samples: 1918 Ma and 2415 Ma, suggesting that have been generated from different sources. The Gray Foliated Granite belongs to the shoshonitic series, type I and metaluminous and are intraplate granites. However, could have been formed into arc cordilheirano, with crustal contamination of other sources. This fact would be confirmed by the TDM ages calculated ≈ 1429 - 1446 Ma. The Isotropic Leucogranite occurs in the form of dykes, NW direction, has massive texture and is inequigranular. Geochemical data show these granitoids are metaluminous the type I shoshonitic series. They are intraplate granites. The Isotropic Leucogranite represents the post-collisional magmatism which took place between 80 and 90 Ma years after the collisional event in central sector of Ribeira Belt. It is crystallized in the Cambrian (512.3 3.3 Ma e 508.6 2.2 Ma) and TDM ages, ca. 1900 Ma
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Imbert, Stulc Anna. „Provenances géographiques des bois de la cathédrale de Notre-Dame de Paris. Compositions élémentaires et isotopiques en Sr et Nd : effet de la carbonisation, référentiels régionaux et applications“. Electronic Thesis or Diss., Sorbonne université, 2023. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2023SORUS594.pdf.

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La charpente de la cathédrale de Notre-Dame de Paris a failli disparaître lors de l’incendie qui l’a ravagé dans la journée du 15 avril 2019. Les vestiges des bois calcinés sont certes sans intérêt pour la reconstruction du bâtiment, mais ils recèlent en eux l’histoire d’un chantier qui s’est déroulé il y a plus de 800 ans. L’étude de ces archives archéologiques est ainsi une opportunité extraordinaire d’en apprendre plus sur son déroulement et sur la relation entre la société et la forêt au Moyen Âge Central (XIe-XIIIe siècles). Une des questions qui permettrait de mieux comprendre la gestion sylvicole et le commerce de bois à cette époque est celle de la provenance des bois. Cette thèse a pour but de préciser l’origine des bois utilisés pour la construction de la charpente avec l’aide des traceurs géochimiques, en particulier la composition multi-élémentaire et les rapports isotopiques du strontium (Sr) et néodyme (Nd) dans le bois. L’intérêt de ces traceurs est de discriminer des sites en fonction des contextes géologiques et pédologiques différents. Au cours de son développement, l’arbre absorbe des nutriments d’origine minérale qui sont en partie transférés dans les parois cellulaires du bois. Les teneurs en nutriments et leurs signatures isotopiques dans le bois reflètent celle des roches et sols sur lesquels l’arbre a poussé. Cette approche est appliquée ici pour la première fois sur le bois archéologique carbonisé. Avant de procéder à l’identification de l’origine des bois de Notre-Dame, 1) la conservation des traceurs géochimiques au cours de la carbonisation a été vérifiée expérimentalement, et 2) un référentiel des signatures multi-élémentaires et isotopiques dans des bois actuels a été réalisé à l’échelle du bassin versant de la Seine. L’exposition à la haute température n’a pas affecté la composition isotopique du Sr et Nd, mais a provoqué une volatilisation et la perte d’une partie des éléments. Des traceurs élémentaires ont été sélectionnés à partir des rapports d’éléments thermostables i.e., ceux dont la baisse de concentration a été négligeable (< 20 % à 800 °C). Le référentiel a été constitué à partir de 12 sites forestiers, chacun représentant un type de substrat spécifique, l’ensemble couvrant la diversité géologique et pédologique du bassin versant de la Seine. L’origine des bois actuels a pu être retracée avec une précision d’environ 80 % et la discrimination des sites s’est avérée fortement contrôlée par le rapport isotopique 87Sr/86Sr, et les rapports élémentaires Sr/Ca et Nd/Ca. Des bois archéologiques provenant de la charpente de Notre-Dame ont été caractérisés selon leur phase d’approvisionnement et leur signatures géochimiques ont été comparées entre elles, et avec celles des forêts référentielles. Les signatures géochimiques de la plupart des bois médiévaux sont caractéristiques des peuplements sur des sols limoneux profonds, en accord avec l'origine affirmée par des sources historiques, au sud-est de Paris
The wooden framework of the Notre-Dame de Paris Cathedral was almost destroyed by fire on April 15, 2019. Although the remains of the charred timbers are not of interest for the reconstruction, they conceal more than 800 years of the monument’s history. Their investigation thus constitutes an extraordinary opportunity to shed light on the construction techniques and relationships between society and forest resources during the Central Middle Ages (11th-13th centuries). A key point to better understand past forestry management and timber trade is the provenance of the timber woods. The aim of this work is to determine the geographical origin of the wood used to build the Notre-Dame's framework with the help of geochemical tracers, in particular the multi-elemental composition and isotope ratios of strontium (Sr) and neodymium (Nd). The strength of geochemical source tracing relies on the ability to discriminate sites based on their geological and soil contexts. During growth, trees absorb mineral-derived nutrients which are partially transferred to the wood cell walls. The abundance and isotopic signature of these mineral-derived nutrients in wood thus reflect those of rocks and soils on which the tree grew. This approach is applied here for the first time to carbonized archeological wood. Before proceeding to identification of the origin of the Notre-Dame timber woods, 1) the preservation of geochemical signals during carbonization was verified experimentally, and 2) a referential database of multi-elemental and Sr-Nd isotopic signatures in modern wood was built at the scale of the Seine River catchment. Although the carbonization led to volatilization and loss of some of the studied elements, it did not affect Sr and Nd isotopic composition of charred wood. Additionally, reliable elemental tracers for provenance were selected on the basis of the ratios of thermostable elements i.e., those whose decrease in concentration was negligible (< 20% at 800°C). The geochemical tracers were tested on modern wood from the 12 referential forests, each representing one type of substrate characteristic of the Seine River catchment area. Determination of the origin of modern wood could be achieved with an accuracy of around 80% and was strongly controlled by the 87Sr/86Sr isotope ratio, as well as by the Sr/Ca and Nd/Ca elemental ratios. The carbonized timbers from the Notre-Dame framework were characterized for cutting dates of trees and their geochemical signatures were compared with one another, and with those of wood from the referential forests. The geochemical signatures of most of the medieval woods were found to be characteristic of forest stands growing on deep silty soils, in agreement with findings from historical archives pointing towards an origin of the timbers in the south-east of Paris
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Bücher zum Thema "Sr/Nd isotopes"

1

Vroon, Pieter Zeger. Subduction of continental material in the Banda Arc, eastern Indonesia: Sr-Nd-Pb isotope and trace-element evidence from volcanics and sediments. [Utrecht: Faculteit Aardwetenschappen der Rijksuniversiteit Utrecht, 1992.

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Valbracht, Peter Jan. The origin of the continental crust of the Baltic shield, as seen through Nd and Sr isotopic variations in 1.89-1.85 Ga old rocks from western Bergslagen, Sweden. Utrecht: Drukkeru Elinkwuk, 1991.

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Survey, Ontario Geological. Geochronology Compilation Map For Ontario : Sheet 2: Southern Ontario: Grenville : Province and Environs : rb-sr, nd-sm, U-pb, and Other Isotopic Systems. S.l: s.n, 1986.

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Kwon, Sung-Tack. Pb-Sr-Nd isotope study of the 100 to 2700 Ma old alkalic rock-carbonatite complexes in the Canadian Shield: Inferences on the geochemical and structural evolution of the mantle. Ann Arbor, MI: University Microfilms International, 1987.

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Buchteile zum Thema "Sr/Nd isotopes"

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Tripathy, Gyana Ranjan, Sunil Kumar Singh und S. Krishnaswami. „Sr and Nd Isotopes as Tracers of Chemical and Physical Erosion“. In Advances in Isotope Geochemistry, 521–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-10637-8_26.

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Okano, Osamu, und Mitsunobu Tatsumoto. „Petrogenesis of Ultramafic Xenoliths from Hawaii Inferred From Sr, Nd, and Pb Isotopes“. In Earth Processes: Reading the Isotopic Code, 135–47. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm095p0135.

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Grousset, F. E., und P. E. Biscaye. „Nd and Sr Isotopes as Tracers of Wind Transport: Atlantic Aerosols and Surface Sediments“. In Paleoclimatology and Paleometeorology: Modern and Past Patterns of Global Atmospheric Transport, 385–400. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0995-3_16.

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Tanimizu, Masaharu, und Tsuyoshi Tanaka. „Ce-Nd-Sr Isotope Systematics of Eucrites and Lunar Rocks“. In Origin of Elements in the Solar System, 555–72. Boston, MA: Springer US, 2002. http://dx.doi.org/10.1007/0-306-46927-8_41.

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D'Antonio, Massimo, George R. Tilton und Lucia Civetta. „Petrogenesis of Italian Alkaline Lavas Deduced from Pb-Sr-Nd Isotope Relationships“. In Earth Processes: Reading the Isotopic Code, 253–67. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm095p0253.

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Bell, K., und J. B. Dawson. „Nd and Sr Isotope Systematics of the Active Carbonatite Volcano, Oldoinyo Lengai“. In IAVCEI Proceedings in Volcanology, 100–112. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79182-6_8.

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Soroka, Elena I., Oksana B. Azovskova, Mikhail Yu Rovnushkin, Mikhail E. Pritchin, Irina V. Smoleva, Natalia G. Soloshenko, Maria V. Streletskaya und Maria V. Zaitceva. „Isotopic (δ13C, δ18O, Rb-Sr and Sm-Nd) Studies of Carbonates from the Vorontsovskoe Gold Deposit (Northern Urals)“. In Springer Proceedings in Earth and Environmental Sciences, 245–52. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-00925-0_36.

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Jourdan, Fred, Andrea Marzoli, Herve Bertrand, Michael Cosca und Denis Fontignie. „The northernmost CAMP: 40Ar/39Ar age, petrology and Sr-Nd-Pb isotope geochemistry of the Kerforne dike, Brittany, France“. In The Central Atlantic Magmatic Province: Insights From Fragments of Pangea, 209–26. Washington, D. C.: American Geophysical Union, 2003. http://dx.doi.org/10.1029/136gm011.

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Krymsky, R. S., B. V. Belyatsky, A. K. Rub und M. G. Rub. „The genesis of the rare-metal greisen Tigrinoe ore-deposit (Sikhote-Alin, Russia): Sm-Nd and Rb-Sr isotope constraints“. In Mineral Deposits at the Beginning of the 21st Century, 433–36. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003077503-110.

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Briqueu, L., C. Mével und F. Boudier. „Sr, Nd and Pb Isotopic Constraints in the Genesis of a Calc-Alkaline Plutonic Suite in Oman Ophiolite Related to the Obduction Process“. In Ophiolite Genesis and Evolution of the Oceanic Lithosphere, 517–42. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3358-6_26.

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Konferenzberichte zum Thema "Sr/Nd isotopes"

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Chen, Lie-Meng, Xie-Yan Song, Rui-Zhong Hu, Song-Yue Yu, Jun-Nian Yi und Jie-Hua Yang. „Petrogenesis of the Xiarihamu Mafic-Ultramafic Intrusion, NW China: Evidence from Mg-Sr-Nd Isotopes“. In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.388.

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Cohen, Maia, Forrest Horton, Marc-Antoine Longpré, Matthew Pankhurst, Jurek Blusztajn und Peter Barry. „Covariance of radiogenic isotopes (Sr, Nd, and Pb) and trace elements in 2021 Cumbre Vieja lavas“. In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.19907.

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Suhrhoff, Tim Jesper, Derek Vance, Jörg Rickli, Marcus Christl und Alexander Prokopenko. „Investigating paleo-silicate weathering at Lake Baikal using radiogenic Sr, Nd, Pb, and meteoric Be isotopes“. In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.15559.

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Koornneef, Janne M., Igor Nikogosian, Natascia Luciani, Antoine J. J. Bracco Gartner, Tim Elliott und Gareth R. Davies. „Coupled Trace Element and Sr-Nd-(Pb) Isotopes in Olivine-Hosted Melt Inclusions from the Mariana Arc“. In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.1357.

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Suhrhoff, Tim Jesper, Jörg Rickli, Marcus Christl, Alexander Prokopenko und Derek Vance. „Reconstructing past weathering conditions at Lake Baikal using radiogenic Sr, Nd, and Pb and meteoric Be isotopes“. In Goldschmidt2022. France: European Association of Geochemistry, 2022. http://dx.doi.org/10.46427/gold2022.10523.

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Conwell, Christopher T., Matthew R. Saltzman und Elizabeth M. Griffith. „TACONIC WEATHERING AND ORDOVICIAN COOLING: TESTING THE LINK USING PAIRED SR AND ND ISOTOPES, ANTELOPE VALLEY, CENTRAL NV“. In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-320575.

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Koornneef, Janne, Yaakov Weiss und Gareth Davies. „Sr-Nd-Pb isotopes of fluids in fibrous diamond record two-stage modification of the Canadian continental root“. In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.16690.

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Meeuws, Fun, Carl Spandler, Mistrel Fetzer Boegheim und Lauren Peters. „Insights into the formation of rhyolite suites of the Peak Ranges, Queensland, Australia, using geochemistry and Sr-Nd isotopes.“ In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.14406.

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Wang, Feng, Kai-Chen Xing, Wen-Liang Xu und Fang-Zhen Teng. „Sr-Nd-Pb-Hf-Mg Isotopes Tracing Fossil Ridge Subduction: A Case Study in the Easternmost Central Asian Orogenic Belt“. In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2719.

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10

Brennan, Eilish, Ivan Savov, Samuele Agostini, Tatiana Churikova, Boris Gordeychik, Alexander Iveson, Daniel Morgan und Madeleine Humphreys. „Boron and B-Sr-Nd isotopes as tracers of FME and volatile enrichments in the mantle source of Kamchatka arc basalts.“ In Goldschmidt2023. France: European Association of Geochemistry, 2023. http://dx.doi.org/10.7185/gold2023.19409.

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Berichte der Organisationen zum Thema "Sr/Nd isotopes"

1

Macêdo Filho, Antomat Avelino, und Maria Helena Hollanda. The Effect of Alteration on Sr-Nd Isotopes of Mafic Rocks: Examples From Rio Ceará-Mirim Dyke Swarm, NE Brazil. Peeref, September 2022. http://dx.doi.org/10.54985/peeref.2209p1380949.

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2

Scanlan, E. J., M. Leybourne, D. Layton-Matthews, A. Voinot und N. van Wagoner. Alkaline magmatism in the Selwyn Basin, Yukon: relationship to SEDEX mineralization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328994.

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Annotation:
Several sedimentary exhalative (SEDEX) deposits have alkaline magmatism that is temporally and spatially associated to mineralization. This report outlines interim data from a study of potential linkages between magmatism and SEDEX mineralization in the Selwyn Basin, Yukon. This region is an ideal study site due to the close spatial and temporal relationships between SEDEX deposits and magmatism, particularly in the MacMillan Pass, where volcanic rocks have been drilled with mineralization at the Boundary deposit. Alkaline volcanic samples were analysed from the Anvil District, MacMillan Pass, Keno-Mayo and the Misty Creek Embayment in the Selwyn Basin to characterise volcanism and examine the relationship to mineralization. Textural and field relationships indicate a volatile-rich explosive eruptive volcanic system in the MacMillan Pass region in comparison to the Anvil District, which is typically effusive in nature. High proportions of calcite and ankerite in comparison to other minerals are present in the MacMillan system. Cathodoluminescence imaging reveals zoning and carbonate that displays different luminescent colours within the same sample, likely indicating multiple generations of carbonate precipitation. Barium contents are enriched in volcanic rocks throughout the Selwyn Basin, which is predominately hosted by hyalophane with rare barite and barytocalcite. Thallium is positively correlated with Ba, Rb, Cs, Mo, As, Sb and the calcite-chlorite-pyrite index and is negatively correlated with Cu. Anvil District samples display a trend towards depleted mid-ocean ridge mantle on a plot of Ce/Tl versus Th/Rb. Hydrothermal alteration has likely led to the removal of Tl from volcanic rocks in the region. Ongoing research involves: i) the analysis of Sr, Nd, Pb and Tl isotopes of volcanic samples; ii) differentiating magmatic from hydrothermal carbonate using O, C and Sr isotopes; iii) examining sources of Ba in the Selwyn Basin; iv) and constraining age relationships through U-Th-Pb geochronology.
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3

Inglis, Jeremy. Utility of Sr and Nd isotope signatures in U ores and UOCs. Office of Scientific and Technical Information (OSTI), Februar 2022. http://dx.doi.org/10.2172/1846891.

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4

Theriault, R. J. Methods for Rb-Sr and Sm-Nd isotopic analyses at the geochronology laboratory, Geological Survey of Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129062.

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5

Whalen, J. B. Geochemical and isotopic (Nd, O, Pb and Sr) data from igneous rocks of the Notre Dame Subzone and adjacent tectonostratigraphic zones, western and central Newfoundland. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2012. http://dx.doi.org/10.4095/291593.

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