Relevant bibliographies by topics / Geochemical signatures

Academic literature on the topic 'Geochemical signatures'

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Published: 10 December 2022
Last updated: 29 January 2023

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Journal articles on the topic "Geochemical signatures"

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Brotodewo, Adrienne, Caroline Tiddy, Diana Zivak, Adrian Fabris, David Giles, Shaun Light, and Ben Forster. "Recognising Mineral Deposits from Cover; A Case Study Using Zircon Chemistry in the Gawler Craton, South Australia." Minerals 11, no. 9 (August 25, 2021): 916. http://dx.doi.org/10.3390/min11090916.

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Detrital zircon grains preserved within clasts and the matrix of a basal diamictite sequence directly overlying the Carrapateena IOCG deposit in the Gawler Craton, South Australia are shown here to preserve U–Pb ages and geochemical signatures that can be related to underlying mineralisation. The zircon geochemical signature is characterised by elevated heavy rare-earth element fractionation values (GdN/YbN ≥ 0.15) and high Eu ratios (Eu/Eu* ≥ 0.6). This geochemical signature has previously been recognised within zircon derived from within the Carrapateena orebody and can be used to distinguish zircon associated with IOCG mineralisation from background zircon preserved within stratigraphically equivalent regionally unaltered and altered samples. The results demonstrate that zircon chemistry is preserved through processes of weathering, erosion, transport, and incorporation into cover sequence materials and, therefore, may be dispersed within the cover sequence, effectively increasing the geochemical footprint of the IOCG mineralisation. The zircon geochemical criteria have potential to be applied to whole-rock geochemical data for the cover sequence diamictite in the Carrapateena area; however, this requires understanding of the presence of minerals that may influence the HREE fractionation (GdN/YbN) and/or Eu/Eu* results (e.g., xenotime, feldspar).
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Halla, Jaana. "Highlights on Geochemical Changes in Archaean Granitoids and Their Implications for Early Earth Geodynamics." Geosciences 8, no. 9 (September 17, 2018): 353. http://dx.doi.org/10.3390/geosciences8090353.

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The Archaean (4.0–2.5 Ga) continental crust is mainly composed of granitoids, whose geochemical characteristics are a function of their formation mechanisms and components, as well as physical conditions of their source. Therefore, revealing changes in Archaean geodynamic processes requires understanding of geochemical changes in Archaean granitoids. This paper compares key geochemical signatures in granitoid occurrences from the Eoarchaean to Neoarchaean Eras and aims to highlight changes or variations in their geochemical signatures. The study is performed by exploring and comparing geochemical and geochronological datasets of Archaean granitoids compiled from literature. The results show that two end-members of sodic TTGs (tonalite–trondhjemite–granodiorite) occur throughout the Archaean: low- and high-HREE (heavy rare earth elements) types. A profound change in granitoid geochemistry occurred between 3.0 and 2.5 Ga when multi-source high-K calc-alkaline granitoid batholiths emerged, possibly indicating the onset of modern-type plate tectonics.
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Brenko, Tomislav, Tena Karavidović, Sibila Borojević Šoštarić, and Tajana Sekelj Ivančan. "The contribution of geochemical and mineralogical characterization of iron slags in provenance studies in the Podravina region, NE Croatia." Geologia Croatica 75, no. 1 (February 28, 2022): 165–76. http://dx.doi.org/10.4154/gc.2022.11.

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Archaeological excavations in the Podravina region led to discovery of sites with traces of bloomery iron production during Late Antiquity and the Early Middle Ages. Mineralogical analysis of the slags recognized fayalite as the main mineral phase, while geochemical analysis confirmed high Fe contents, typical for bloomery iron smelting. Based on the previously established occurrences of bog iron ores in the study area, provenance studies were carried out using trace and rare earth elements to create a geochemical signature. Similar shapes and patterns of bog iron ores and iron slag signatures imply a genetic connection between the ore and the slag, as well as variation related to the temporal and spatial context of both slags and ores.
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Steenfelt, A. "Geochemical signatures of gold provinces in South Greenland." Applied Earth Science 109, no. 1 (April 2000): 14–22. http://dx.doi.org/10.1179/aes.2000.109.1.14.

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Tiddy, Caroline, Diana Zivak, June Hill, David Giles, Jim Hodgkison, Mitchell Neumann, and Adrienne Brotodewo. "Monazite as an Exploration Tool for Iron Oxide-Copper-Gold Mineralisation in the Gawler Craton, South Australia." Minerals 11, no. 8 (July 26, 2021): 809. http://dx.doi.org/10.3390/min11080809.

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The chemistry of hydrothermal monazite from the Carrapateena and Prominent Hill iron oxide-copper-gold (IOCG) deposits in the IOCG-rich Gawler Craton, South Australia, is used here to define geochemical criteria for IOCG exploration in the Gawler Craton as follows: Monazite associated with IOCG mineralisation: La + Ce > 63 wt% (where La > 22.5 wt% and Ce > 37 wt%), Y and/or Th < 1 wt% and Nd < 12.5 wt%; Intermediate composition monazite (between background and ore-related compositions): 45 wt% < La + Ce < 63 wt%, Y and/or Th < 1 wt%. Intermediate monazite compositions preserving Nd > 12.5 wt% are considered indicative of Carrapateena-style mineralisation; Background compositions: La + Ce < 45 wt% or Y or Th > 1 wt%. Mineralisation-related monazite compositions are recognised within monazite hosted within cover sequence materials that directly overly IOCG mineralisation at Carrapateena. Similar observations have been made at Prominent Hill. Recognition of these signatures within cover sequence materials demonstrates that the geochemical signatures can survive processes of weathering, erosion, transport and redeposition into younger cover sequence materials that overlie older, mineralised basement rocks. The monazite geochemical signatures therefore have the potential to be dispersed within the cover sequence, effectively increasing the geochemical footprint of mineralisation.
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Hamud, A. Al, S. V. Rasskazov, I. S. Chuvashova, T. A. Yasnygina, and A. Hassan. "Comparative analysis of geochemical signatures for sources of Cenozoic sedimentary deposits laterally to South Baikal." Geology and Environment 2, no. 1 (2022): 110–21. http://dx.doi.org/10.26516/2541-9641.2022.1.110.

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Geochemical signatures of Oligocene and Miocene sedimentary deposits from the Khoygot Paleovalley of Vitim Plateau changed successively over time that reflected change in sources of terrigenic material in the context of the migratory nature of the development of the river network. Geochemical signatures of Eocene-Miocene sedimentary deposits from the eastern (Mishikha-Klyuevka) and western (Osinovka) paleovalleys of the Tankhoy tectonic step of South Baikal were uniform that indicates long-term intake of sedimentary material from a common source. Composition of sedimentary material from paleovalleys of the Tankhoy step was controlled by a limited catchment. After the early Pliocene structural reorganization, geochemical signatures of sedimentary deposits from the eastern part of the Tankhoy tectonic step became similar to those of the Pliocene-Quaternary alluvium frpm the Proto-Manzurka valley of the opposite (north-western) coast of Lake Baikal. It is assumed that the common source of Pliocene-Quaternary sedimentary material was located in Jurassic (Pra-Manzurka) and Upper Jurassic-Lower Cretaceous (eastern part of the Tankhoy tectonic step) sedimentary rocks, disintegrated and eroded on the uplifts of the Primorsky and Khamar-Daban ranges.
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Silva, A. J. F., M. R. Azevedo, B. Valle Aguado, J. A. Nogueira Neto, T. J. S. Santos, and F. D. O. Silva. "Petrographical and geochemical signatures of the Granja paragneisses (Médio Coreaú Domain, NW Ceará, Brasil)." Estudios Geológicos 70, no. 2 (August 25, 2014): e014. http://dx.doi.org/10.3989/egeol.41750.326.

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Ramkumar, Muthuvairavasamy. "Discrimination of tectonic dynamism, quiescence and third order relative sea level cycles of the Cauvery Basin, South India." Annales g?ologiques de la Peninsule balkanique, no. 76 (2015): 19–45. http://dx.doi.org/10.2298/gabp1576.

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Application of integrated stratigraphic modeling of sedimentary basins with the help of sequence and chemostratigraphic methods for improved understanding on the relative roles of depositional pattern and history of a Barremian-Danian stratigraphic record of the Cauvery Basin, India was attempted. Through enumeration of facies characteristics, tectonic structures and geochemical characteristics of the sedimentary rocks the use of geochemical signatures in distinguishing the relative roles of major factors has been evaluated. The results indicate that the geochemical signatures of the sedimentary rocks accurately record the prevalent geological processes and an ability to distinguish them through employing stratigraphic variations of compositional values and discrimination diagrams help in understanding the basinal history better. In addition, predomination of relative sea level fluctuations and active nature of tectonic movements during few time slices, which in turn was overwhelmed by sea level fluctuations are also inferred.
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Silliman, Alan H., and Rick Schrynemeeckers. "Microseepage through evaporite sequences — A Gulf of Suez example." Interpretation 10, no. 1 (December 24, 2021): SB39—SB47. http://dx.doi.org/10.1190/int-2021-0078.1.

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Salt is one of the most effective agents for trapping oil and gas. As a ductile material, it can move and deform surrounding sediments and create traps. However, effective sealing of reservoirs for movement of hydrocarbons along breaching faults or fracture swarms (i.e., macroseepage) is a different mechanism than the movement of hydrocarbons on a molecular scale along grain boundaries and microfractures as happens with microseepage. To address salt seal integrity, Forum Exploration has chosen to evaluate the applicability of passive surface geochemical surveys for mapping hydrocarbons in their onshore West Gebel El Zeit lease in part due to difficulties in seismic imaging through salt and anhydrite sequences. Two economic producing wells have been drilled in the lease, but due to compartmentalization and complexity in the area, three dry wells also have been drilled. Target formations include the Kareem Formation at approximately 2700 m and the Rudeis Formation at approximately 3000 m. The geochemical survey encompasses 100 passive geochemical modules. Passive samplers also have been deployed around two producing wells and one dry well for geochemical calibration. Calibration data indicate positive thermogenic signatures around the two producing wells in contrast to the background or baseline signature from around the dry well. The Kareem Formation calibration signature ranges from approximately C6 to C12 with the Rudeis Formation calibration signature ranging from C5 to C9. This suggests that the Rudeis calibration signature is lighter than the Kareem, in agreement with independent measurement of American Petroleum Institute (API) gravity on produced oil samples (API gravity 41° oil for the Rudeis and 35° oil for the Kareem). A postsurvey well, Fh85-8, has been drilled based on combined geochemical and seismic data results. The well is a Kareem oil discovery, with an initial production of approximately 800 barrels of oil per day. We have developed evidence in this Gulf of Suez example to show that microseepage occurs through substantial salt sequences. Consequently, ultrasensitive passive surface geochemical surveys provide a powerful tool for derisking salt plays.
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Jackson, Matthew G., Janne Blichert-Toft, Saemundur A. Halldórsson, Andrea Mundl-Petermeier, Michael Bizimis, Mark D. Kurz, Allison A. Price, et al. "Ancient helium and tungsten isotopic signatures preserved in mantle domains least modified by crustal recycling." Proceedings of the National Academy of Sciences 117, no. 49 (November 23, 2020): 30993–1001. http://dx.doi.org/10.1073/pnas.2009663117.

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Rare high-3He/4He signatures in ocean island basalts (OIB) erupted at volcanic hotspots derive from deep-seated domains preserved in Earth’s interior. Only high-3He/4He OIB exhibit anomalous182W—an isotopic signature inherited during the earliest history of Earth—supporting an ancient origin of high3He/4He. However, it is not understood why some OIB host anomalous182W while others do not. We provide geochemical data for the highest-3He/4He lavas from Iceland (up to 42.9 times atmospheric) with anomalous182W and examine how Sr-Nd-Hf-Pb isotopic variations—useful for tracing subducted, recycled crust—relate to high3He/4He and anomalous182W. These data, together with data on global OIB, show that the highest-3He/4He and the largest-magnitude182W anomalies are found only in geochemically depleted mantle domains—with high143Nd/144Nd and low206Pb/204Pb—lacking strong signatures of recycled materials. In contrast, OIB with the strongest signatures associated with recycled materials have low3He/4He and lack anomalous182W. These observations provide important clues regarding the survival of the ancient He and W signatures in Earth’s mantle. We show that high-3He/4He mantle domains with anomalous182W have low W and4He concentrations compared to recycled materials and are therefore highly susceptible to being overprinted with low3He/4He and normal (not anomalous)182W characteristic of subducted crust. Thus, high3He/4He and anomalous182W are preserved exclusively in mantle domains least modified by recycled crust. This model places the long-term preservation of ancient high3He/4He and anomalous182W in the geodynamic context of crustal subduction and recycling and informs on survival of other early-formed heterogeneities in Earth’s interior.
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Dissertations / Theses on the topic "Geochemical signatures"

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Smith, Jennifer Mae. "Geochemical signatures in the coral Montastraea modern and mid-Holocene perspectives /." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001593.

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Mellicant, Emily. "Geochemical signatures of parent materials and lake sediments in northern Minnesota." Thesis, Kansas State University, 2017. http://hdl.handle.net/2097/35446.

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Master of Arts
Department of Geography
Kendra K. McLauchlan
The importance of local parent material has been recognized as a fundamental control on the geochemistry of lake sediments, but there have been relatively few broad-scale surveys of catchment sources of terrigenous lake sediments. In this paper, I present a geochemical study of catchment parent materials and lake sediments from four lakes in Northern Minnesota. Similar climate and vegetation conditions are present at all four lakes, which vary mainly in catchment parent material and lake morphometry. Geochemical data including major, trace and rare earth elements (REEs) from catchment parent material samples was compared with lake sediment geochemical data using PCA, linear regression, geological indices and elemental ratios. In homogenous till-dominated catchments, patterns of elemental variation in the catchment till could be extended to predict elemental concentrations in the lake sediments. Simple ratios, which are commonly used to analyze lake sediment geochemical data, were not good predictors of lake sediment composition, however. Catchments with mixed bedrock and till were compositionally heterogeneous, and comparison with lake sediments was difficult. Lack of grain size control and biogenic silica measurements further confounded analysis. However, ΣREE/Y ratio was found to be diagnostic of the catchment parent materials and present within the lake sediments. This study makes a contribution to an improved understanding of lacustrine sedimentary archives by analyzing the spatial linkages among catchment, water and sedimentary geochemistry.
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Chhun, Eath. "Ordovician igneous rocks of the central Lachlan Fold Belt : geochemical signatures of ore-related magmas /." University of Sydney. Geosciences, 2004. http://hdl.handle.net/2123/610.

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The majority of economic gold deposits in NSW are associated with Ordovician-aged igneous rocks and are examples of the Cu-Au porphyry-skarn-epithermal association commonly developed in convergent margin to orogenic settings. They are among the oldest porphyry Cu-Au deposits in the Pacific Rim region. They are similar to younger deposits in terms of tectonic setting and structure, but the largest are chemically distinct, being associated with shoshonite magmas (Cadia, Ridgeway and Northparkes). The Lachlan Fold Belt (LFB) porphyries are subdivided into four sub-groups based mainly on their age relative to development of the Lachlan Transverse Zone (LTZ) structure. Two subgroups pre-date the LTZ, one group is syn�LTZ and one group post-dates the LTZ. No mineralisation has been found or reported among pre-I.TZ porphyries. but it is common in post- . l Z_ porphyries. Petrographic analysis and microprobe results establish a wide range of primary and secondary features within the Ordovician rocks examined in this study. Cale alkaline to shoshonitic affinities are supported by the variable abundance of primary K-feldspars. Primary mineral phases such as pyroxenes and igneous magnetite provide an indication of fractioning mineral assemblages responsible for igneous trends in magma chemistry. The hydrothermal mineral assemblages documented in these LFB study areas are characteristic of younger Cu-Au Porphyry style mineralisation. As expected, the most pervasive alteration is associated with highly mineralised shoshonitic Ordovician rocks at Ridgeway, and Cadia. the less strongly mineralised calc alkaline Ordovician rocks at Cargo. Copper Ilill and Fairholme. are correspondingly less strongly altered overall. although secondary mineral assemblages are locally abundant. Many varieties of oxides and carbonates are observed at the different study localities. Most of the studied samples conform to igneous chemical trends because they are weakly altered, although post magmatic processes, such as veining, are detectable in certain trends. The K2O enrichment of the studied samples is consistent with subductionmoditied mantle wedge sources. A few effects, such as the high Fe203 contents of some Ridgeway samples, probably reflect porphyry-style hydrothermal alteration processes. Host rocks at the Cadia and Ridgeway are entirely alkalic on the K2O versus SiO2 plot and shoshonitic on the Total Alkalies versus SiO2 plot. Igneous rocks at the other deposits display a range of compositions between low K tholeiites to shoshonites that in some cases reflects multiple igneous suites. The LREE and L1LE enrichments, and HFSE depletions (Nb, Ta and Ti) of the magmas associated with these deposits are characteristics of a subduction-related tectonic setting. They all fall in the volcanic-arc granite and syn-collisional granite field of the Nb-Y tectonic discrimination diagram. Several magma types are identified by differences in the HFSE and REE trends. Differences in the extent and style of magma fractionation are evident in the trace element data. The Ridgeway samples define a wider range of trace element concentrations than the Cadia samples that may indicate a greater extent of fractionation during emplacement of the Ridgeway magmas. Fairholme samples display a high Nh and /If trends that are distinct from the main fields on Zr variation diagrams. Compositional differences between larger Cu-Au deposits, Cadia-Ridgeway and smaller deposits, Copper Ifill, Cargo and Fairholme are evident in terms of Nb-Ta depletion and variation. The smaller deposits show constant Nb/Ta or negative Nb/Ta trends that extend to high Nb. The larger deposits display positive Nb/Ta trends that do not extend to high Nb. This distinction reflects a difference of preferential incorporation of Nb in a mineral phase (magnetite). Comparisons between Cadia-Ridgeway and other shoshonite (altered samples of Bajo de la Alumbrera, Argentina), calc alkaline magmas from New Zealand and rocks from other areas indicate that Nb/Ta is not directly correlated with the shoshonitic classification, K2O vs. SiO2, and that the Cadia-Ridgeway Nb and Ta variation is not the result of alteration. The fact that the weakly altered LFB Capertee shoshonites exhibit a narrow range of Nb and low Nb/Ta suggest the shoshonite trend for the LFB as a whole is a steep one on the Nb/Ta versus Nb plot. The results of this study could provide important information for exploration within the LFB. Only the Cadia and Ridgeway deposits display a wide range of Nb/Ta values and lack the near-horizontal trend seen for other localities associated with smaller deposits. The tectonic evolution of the LFB is a major factor contributing to occurrence of large porphyry Cu-Au deposits. The sequence of important events, however, commences with sub-crustal generation of oxidised magma and finishes with efficient Cu-Au accumulation by hydrothermal processes at favourable structural sites. The increase in Au-Cu deposit size from small (Copper Hill-Cargo) to world class (Cadia-Ridgeway) indicates the importance of magma composition during this process. The most obvious differences between the Cadia-Ridgeway and New Zealand rocks is that the latter are volcanic in origin and associated with an arc-back arc system. Therefore, they did not form in a tectonic regime suitable for the evolution of porphyries and the focussed movement of hydrothermal fluids during dilatant episodes. As a result, they are not linked to mineralisation despite having Nb-Ta and Nb/Ta variations that are typical of the high oxidation states in Au-prospective magmas of the LFB.
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Miyajima, Yusuke. "Origin of methane at ancient methane seeps inferred from organic geochemical signatures in seep carbonates." Kyoto University, 2018. http://hdl.handle.net/2433/232261.

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Ice, Bryan w. "RECONSTRUCTING THE PALEOCLIMATE OF THE MIDDLE DEVONIAN USING MARCELLUS SHALE GEOCHEMICAL SIGNATURES, SENECA FALLS, NY." Kent State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=kent1566402595586501.

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Che-Alota, Vukenkeng. "Temporal geophysical and geochemical signatures due to contaminant source reduction at Wurtsmith Air Force Base in Oscoda Michigan, USA." Click HERE to connect, 2009. http://digital.library.okstate.edu/etd/CheAlota_okstate_0664M_10176.pdf.

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Harden, Judy Ann. "Light element and lithium isotope signatures of the emii reservoir - the society islands, french polynesia geochemical results and an educational application /." [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001069.

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Brown, Megan Elizabeth. "Geochemical and Taphonomic Signatures of Freshwater Mussel Shells as Evidence of Mercury-Related Extirpations in the North Fork Holston River, Virginia." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/33028.

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This study utilized freshwater mussel shells to assess the role of mercury contamination in the North Fork Holston River, an aquatic habitat affected by extensive extirpations of mussel populations starting in the early 1970â s. Mussel shells (n=366) collected from 5 sites, upstream and downstream of Saltville (where mercury was used from 1950-1972) were analyzed to test if: (1) geochemical signatures of shells record variation in mercury levels relative to the contamination source; and (2) shell taphonomy could be used to differentiated affected and unaffected sites. Analysis of 40 shells for geochemical signatures using atomic absorption spectroscopy indicated a strong longitudinal pattern. Mercury content was as follows: upstream sites had low Hg concentrations (<5 to 31ppb), shells directly below Saltville had high concentrations (23-4,637ppb), shells 18km downstream of Saltville displayed intermediate values (7-115ppb), and those 38.4km downstream were comparable to upstream sites (<10ppb). Two pre-industrial shells collected from Saltville in 1917 also yielded Hg estimates (5-6ppb) comparable with upstream estimates. The Hg content was not correlated with shell length (r=-0.3; p=0.2) or degree of taphonomic alteration (r=0.18; p=0.28). Analysis of 366 shells for taphonomic signatures indicated that shells are most heavily altered and fragmented directly downstream of Saltville. In contrast, upstream sites, inhabited by reproducing mussel populations, contain many fresh-dead shells. Taphonomic signatures can thus be used to differentiate sites with different extirpation histories. Relic mussel shells can provide useful spatial and temporal data on Hg concentrations in polluted ecosystems and offer a tool for delineating areas with unknown extirpation histories.
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Himmler, Tobias [Verfasser], Jörn [Akademischer Betreuer] Peckmann, and Gerhard [Akademischer Betreuer] Bohrmann. "Signatures of geochemical changes at methane-seeps as recorded by seep carbonates / Tobias Himmler. Gutachter: Jörn Peckmann ; Gerhard Bohrmann. Betreuer: Jörn Peckmann." Bremen : Staats- und Universitätsbibliothek Bremen, 2011. http://d-nb.info/1071842048/34.

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Drouin, Marc. "Application of Factor Analysis in the Identification of a Geochemical Signature of Buried Kimberlites in Near-surface Groundwaters in the Attawapiskat Area of the James Bay Lowlands of Northern Ontario, Canada." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/22872.

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In the James Bay Lowlands of northern Ontario, kimberlite pipes are concealed by peat, thick layers of till, and Tyrell sea sediments. Studies have shown that buried ore bodies produce geochemical signatures in surface media. This thesis explores the geochemistry of near-surface groundwater above concealed kimberlite pipes using factor analysis to determine whether (1) a factor analysis can reveal an underlying structure (factors) in a multivariate groundwater geochemical dataset, and whether (2) those factors are related to the presence of concealed kimberlite. Factor analysis was performed on two datasets of nearsurface groundwater, collected at 0.2 m and 1.1 m below ground surface in peat. Results revealed that (1) there is a significant difference in the behaviour of elements in groundwater near the surface compared to those in deeper groundwater, which is sheltered from the effects of the atmosphere; (2) for both datasets, the first factor is dominated by elements known to be enriched in kimberlite, notably rare earth elements (REE), U, Th, Ti – the composition of factor one is consistent with their derivation from kimberlite in a limestone background where such elements are in very low concentration; (3) high-valence and lowvalence kimberlite indicator elements (KIE) are found separated into distinct factors suggesting that once released from the kimberlite after weathering, KIE are subjected to various geochemical processes to be differentiated as they migrate upward to the surface; and (4) Fe and Mn load on a factor distinct from other metals, suggesting that in this environment Fe-Mn-O-OH is not a significant controller of metal mobility in groundwater. Overall, this research has further highlighted the multivariate nature of geochemical processes in groundwater. Compared with previous work in geochemical exploration where often only univariate or bivariate statistics or single element profiles over concealed ore bodies were used, this thesis has shown that factor analysis, as a multivariate data analysis technique, is a robust exploration tool, able to shed light on relevant geochemical processes hidden within geochemical datasets. This thesis shows that high-valence KIE, notably U,V, Th, Ti and the REE, as a group, are better indicators of the presence of kimberlites than other well-known KIE. Single element concentration profiles such as Ni or Cr (known KIE) show similar anomalies over a concealed kimberlite as a factor score profile for factor one (U, V, Th, Ti, REE, Ni) would; however, it is the peculiar assemblage of elements in factor one that makes it unique to kimberlites, a feature that can be used in future exploration work for concealed kimberlites in similar surficial environments, such as the Siberian wetlands. The results suggest that future geochemical exploration work involving groundwater should focus on the more stable groundwater located below the zone of oxidation, sheltered from the effects of the atmosphere.
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Books on the topic "Geochemical signatures"

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Madden, Dawn J. Geochemical signatures of mineral deposits and rock types as shown in stream sediments from the Chugach and Prince William terranes, Anchorage quadrangle, southern Alaska. [Denver, Colo.]: U.S. Dept. of the Interior, Geological Survey, 1987.

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Nash, J. Thomas. Geochemical signatures of ores and altered rocks in the Gilbert District, Esmeralda County, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of ores and altered rocks in the Gilbert District, Esmeralda County, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of ores and altered rocks in the Gilbert District, Esmeralda County, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of ore deposits and mineralized rocks from the Pilot Mountains, Mineral County, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of ore deposits and mineralized rocks from the Pilot Mountains, Mineral County, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of ore deposits and mineralized rocks in the Cedar Mountains, Mineral and Nye Counties, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of ore deposits and mineralized rocks in the Cedar Mountains, Mineral and Nye Counties, Nevada. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1985.

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Nash, J. Thomas. Geochemical signatures of silver and gold deposits, Tonopah 1⁰ x 2⁰ quadrangle, Nevada: Description and applications to exploration. Washington: U.S. G.P.O., 1994.

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Mosier, Elwin L. Analytical results, geochemical signatures and sample locality map of lode gold, placer gold, and heavy-mineral concentrates from the Koyukuk-Chandalar mining district, Alaska. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Book chapters on the topic "Geochemical signatures"

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Glikson, Andrew Y. "Extraterrestrial Geochemical, Isotopic and Mineralogical Signatures." In The Asteroid Impact Connection of Planetary Evolution, 57–65. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6328-9_7.

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Padmanabhan, E., and D. Jeffrey Over. "Geochemical Signatures of Some Devonian Black Shales." In ICIPEG 2014, 277–81. Singapore: Springer Singapore, 2015. http://dx.doi.org/10.1007/978-981-287-368-2_26.

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Vogt, P. R. "Geophysical and Geochemical Signatures and Plate Tectonics." In The Nordic Seas, 413–664. New York, NY: Springer New York, 1986. http://dx.doi.org/10.1007/978-1-4615-8035-5_11.

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Muñoz-Espadas, María-Jesús, Jesús Martínez-Frías, and Rosario Lunar. "Main Geochemical Signatures Related to Meteoritic Impacts in Terrestrial Rocks: A Review." In Impact Studies, 65–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55463-6_3.

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do Rego Barros Fernandes de Lima, Marta M., Virgínio Henrique Neumann, Maria Teresa Taboada Castro, Enjôlras de A. Medeiros Lima, Edmilson Santos de Lima, and Ricardo Ferreira da Silva. "Geochemical Signatures of Recent Holocene Estuarine Sediments of the Jaboatão River, Pernambuco, Brazil." In Springer Geology, 857–61. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04364-7_161.

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Marques, José Manuel, Hans Eggenkamp, Paula M. Carreira, and Manuel Antunes da Silva. "Chlorine Geochemical and Isotopic (37Cl/35Cl) Signatures of CO2-Rich Mineral Waters (N-Portugal): Revisited." In Advances in Sustainable and Environmental Hydrology, Hydrogeology, Hydrochemistry and Water Resources, 211–13. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-01572-5_51.

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Hickey-Vargas, Rosemary, Ivan P. Savov, Michael Bizimis, Teruaki Ishii, and Kantaro Fujioka. "Origin of diverse geochemical signatures in igneous rocks from the West Philippine Basin: Implications for tectonic models." In Back-Arc Spreading Systems: Geological, Biological, Chemical, and Physical Interactions, 287–303. Washington, D. C.: American Geophysical Union, 2006. http://dx.doi.org/10.1029/166gm15.

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Rushmer, Tracy, and Kurt Knesel. "Defining Geochemical Signatures and Timescales of Melting Processes in the Crust: An Experimental Tale of Melt Segregation, Migration and Emplacement." In Timescales of Magmatic Processes, 181–211. Chichester, UK: John Wiley & Sons, Ltd, 2010. http://dx.doi.org/10.1002/9781444328509.ch9.

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McDonald, Iain, Gordon J. Irvine, Eveline de Vos, Andrew S. Gale, and Wolf Uwe Reimold. "Geochemical Search for Impact Signatures in Possible Impact-generated Units Associated with the Jurassic-Cretaceous Boundary in southern England and northern France." In Impact Studies, 257–86. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/3-540-25736-5_12.

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Chenaker, Hichem, Belgacem Houha, and Mohamed Rida Mohmadi. "Hydro-geochemical Signature in the Thermal Waters in Algeria." In Sustainable Energy-Water-Environment Nexus in Deserts, 263–66. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-76081-6_32.

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Conference papers on the topic "Geochemical signatures"

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Schrynemeeckers, Rick. "Acquire Ocean Bottom Seismic Data and Time-Lapse Geochemistry Data Simultaneously to Identify Compartmentalization and Map Hydrocarbon Movement." In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/30975-ms.

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Abstract Current offshore hydrocarbon detection methods employ vessels to collect cores along transects over structures defined by seismic imaging which are then analyzed by standard geochemical methods. Due to the cost of core collection, the sample density over these structures is often insufficient to map hydrocarbon accumulation boundaries. Traditional offshore geochemical methods cannot define reservoir sweet spots (i.e. areas of enhanced porosity, pressure, or net pay thickness) or measure light oil or gas condensate in the C7 – C15 carbon range. Thus, conventional geochemical methods are limited in their ability to help optimize offshore field development production. The capability to attach ultrasensitive geochemical modules to Ocean Bottom Seismic (OBS) nodes provides a new capability to the industry which allows these modules to be deployed in very dense grid patterns that provide extensive coverage both on structure and off structure. Thus, both high resolution seismic data and high-resolution hydrocarbon data can be captured simultaneously. Field trials were performed in offshore Ghana. The trial was not intended to duplicate normal field operations, but rather provide a pilot study to assess the viability of passive hydrocarbon modules to function properly in real world conditions in deep waters at elevated pressures. Water depth for the pilot survey ranged from 1500 – 1700 meters. Positive thermogenic signatures were detected in the Gabon samples. A baseline (i.e. non-thermogenic) signature was also detected. The results indicated the positive signatures were thermogenic and could easily be differentiated from baseline or non-thermogenic signatures. The ability to deploy geochemical modules with OBS nodes for reoccurring surveys in repetitive locations provides the ability to map the movement of hydrocarbons over time as well as discern depletion affects (i.e. time lapse geochemistry). The combined technologies will also be able to: Identify compartmentalization, maximize production and profitability by mapping reservoir sweet spots (i.e. areas of higher porosity, pressure, & hydrocarbon richness), rank prospects, reduce risk by identifying poor prospectivity areas, accurately map hydrocarbon charge in pre-salt sequences, augment seismic data in highly thrusted and faulted areas.
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Hussain, Maaruf, Abduljamiu Amao, Khalid Al-Ramadan, Lamidi Babalola, and John Humphrey. "Utilization of Geochemical Signatures for Unconventional Reservoir Characterization, Saudi Arabia." In Abu Dhabi International Petroleum Exhibition & Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/203212-ms.

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Ice, Bryan, and Jeremy C. Williams. "RECONSTRUCTING THE MIDDLE DEVONIAN PALEOCLIMATE USING MARCELLUS SHALE GEOCHEMICAL SIGNATURES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-322720.

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Frisk, Madilyn, and Thomas A. Hickson. "IMPLICATIONS OF GEOCHEMICAL SIGNATURES OF MICROBIALITES IN A MIOCENE LAKE SYSTEM." In 54th Annual GSA North-Central Section Meeting - 2020. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020nc-348178.

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McCusker Hill, Megan, William B. Ouimet, and Sean Gonzales. "SPATIAL VARIATION IN GEOCHEMICAL SIGNATURES OF THE ANTHROPOCENE IN NORTHEASTERN US." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-308184.

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Slabic, Ane, and Daniel Imrecke. "GEOCHEMICAL SIGNATURES OF MARTIAN SHOCKED CALCIUM PHOSPHATE MINERALS: IMPACTS AND IMPLICATIONS." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-383185.

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Hussain, Maaruf, Ardiansyah Negara, Abduljamiu Amao, and Khalid Al-Ramadan. "Prediction of Rock Mechanical Properties from Geochemical Signatures using Machine Learning Algorithm." In Abu Dhabi International Petroleum Exhibition & Conference. Society of Petroleum Engineers, 2020. http://dx.doi.org/10.2118/202708-ms.

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Mellicant, Emily Maria, and Kendra K. McLauchlan. "GEOCHEMICAL SIGNATURES OF PARENT MATERIALS IN LAKE SEDIMENTS IN NORTHERN MINNESOTA, USA." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287477.

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Whitacre, Macy J., and Lee J. Florea. "STRATIGRAPHIC AND GEOCHEMICAL SIGNATURES OF EOGENETIC PALEOKARST IN VISEAN CARBONATES, SOUTHEAST KENTUCKY." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-279202.

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Abidin, N. S. Zainal, K. A. Mustapha, W. H. Abdullah, and M. H. Hakimi. "STRATIGRAPHIC CHANGES OF GEOCHEMICAL SIGNATURES OF THE CENOZOIC BALINGIAN COAL, SARAWAK, MALAYSIA." In 30th International Meeting on Organic Geochemistry (IMOG 2021). European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202134221.

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Reports on the topic "Geochemical signatures"

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Robinson, S. V. J., R. C. Paulen, C. W. Jefferson, M. B. McClenaghan, D. Layton-Matthews, D. Quirt, and P. Wollenberg. Till geochemical signatures of the Kiggavik uranium deposit, Nunavut. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2014. http://dx.doi.org/10.4095/293857.

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Poulin, R. S., A. M. McDonald, D. J. Kontak, and M. B. McClenaghan. Scheelite geochemical signatures and potential for fingerprinting ore deposits. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/296473.

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Karen E. Wright and Carl D. Palmer. Geochemical Signatures as a Tool for Vermiculite Provenance Determination. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/941739.

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McClenaghan, M. B., M. A. Parkhill, A. A. Seaman, A. G. Pronk, M. Pyne, J. M. Rice, and S. Hashmi. Till geochemical signatures of the Sisson W-Mo deposit, New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/292837.

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Xie, YuLong, Christopher J. Murray, George V. Last, and Robert D. Mackley. Mineralogical and Bulk-Rock Geochemical Signatures of Ringold and Hanford Formation Sediments. Office of Scientific and Technical Information (OSTI), March 2003. http://dx.doi.org/10.2172/15010111.

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King, R. D., S. J. Piercey, R. C. Paulen, S. J. A. Day, I R Smith, and J. A. Petrus. Isotopic and geochemical signatures of base-metal indicator minerals in the southern Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2019. http://dx.doi.org/10.4095/315440.

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Kupsch, B. G., and O. Catuneanu. Alteration features and geochemical signatures of the Maybelle River uranium zone, Athabasca Basin, Alberta. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2007. http://dx.doi.org/10.4095/223780.

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McClenaghan, M. B., M. A. Parkhill, A. G. Pronk, G. R. Boldon, R M Pyne, and J. M. Rice. Till geochemical signatures of the Mount Pleasant Sn-W-Mo-Bi-In deposit, New Brunswick. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2015. http://dx.doi.org/10.4095/295614.

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Oviatt, N. M., M. B. McClenaghan, R. C. Paulen, and S. A. Gleeson. Till geochemical signatures of the Pine Point Pb-Zn Mississippi Valley-type district, Northwest Territories. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2013. http://dx.doi.org/10.4095/292906.

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Matte, S., M. Constantin, and R. Stevenson. Mineralogical and geochemical characterisation of the Kipawa syenite complex, Quebec: implications for rare-earth element deposits. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329212.

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The Kipawa rare-earth element (REE) deposit is located in the Parautochton zone of the Grenville Province 55 km south of the boundary with the Superior Province. The deposit is part of the Kipawa syenite complex of peralkaline syenites, gneisses, and amphibolites that are intercalated with calc-silicate rocks and marbles overlain by a peralkaline gneissic granite. The REE deposit is principally composed of eudialyte, mosandrite and britholite, and less abundant minerals such as xenotime, monazite or euxenite. The Kipawa Complex outcrops as a series of thin, folded sheet imbricates located between regional metasediments, suggesting a regional tectonic control. Several hypotheses for the origin of the complex have been suggested: crustal contamination of mantle-derived magmas, crustal melting, fluid alteration, metamorphism, and hydrothermal activity. Our objective is to characterize the mineralogical, geochemical, and isotopic composition of the Kipawa complex in order to improve our understanding of the formation and the post-formation processes, and the age of the complex. The complex has been deformed and metamorphosed with evidence of melting-recrystallization textures among REE and Zr rich magmatic and post magmatic minerals. Major and trace element geochemistry obtained by ICP-MS suggest that syenites, granites and monzonite of the complex have within-plate A2 type anorogenic signatures, and our analyses indicate a strong crustal signature based on TIMS whole rock Nd isotopes. We have analyzed zircon grains by SEM, EPMA, ICP-MS and MC-ICP-MS coupled with laser ablation (Lu-Hf). Initial isotopic results also support a strong crustal signature. Taken together, these results suggest that alkaline magmas of the Kipawa complex/deposit could have formed by partial melting of the mantle followed by strong crustal contamination or by melting of metasomatized continental crust. These processes and origins strongly differ compare to most alkaline complexes in the world. Additional TIMS and LA-MC-ICP-MS analyses are planned to investigate whether all lithologies share the same strong crustal signature.
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