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Journal articles on the topic 'Sm-Nd geochronology'

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Published: 10 December 2022

Last updated: 29 January 2023

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1

Cavell, P. A., and H. Baadsgaard. "Geochronology of the Big Spruce Lake alkaline intrusion." Canadian Journal of Earth Sciences 23, no. 1 (January 1, 1986): 1–10. http://dx.doi.org/10.1139/e86-001.

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A zircon age of [Formula: see text] has been determined for the silica-saturated syenites of the Big Spruce Lake alkaline complex. Pb–Pb whole-rock ages of [Formula: see text] and 2155 ± 16 Ma were obtained for the silica-undersaturated rocks of the complex and for the complex as a whole, respectively. The Sm–Nd whole-rock data yield an age of 2183 ± 75 Ma for the complex as a whole. By weighting the ages by the inverse square of the standard deviations, an average age for the complex of 2174 ± 20 Ma is determined. However, it is felt the zircon age is the most reliable for the time of crystallization of the complex. Minor contamination by country rock (Sm–Nd model ages of 2467–2595 Ma) and metasomatism contribute to scattered Sm–Nd data points and large errors in the ages obtained for the five individual units. The Pb–Pb data enable a limiting estimate of about 50 Ma for the maximum time span for the intrusion of centres 1–4.

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2

Bast, R., E. E. Scherer, P. Sprung, M. Fischer-Gödde, A. Stracke, and K. Mezger. "Correction: A rapid and efficient ion-exchange chromatography for Lu–Hf, Sm–Nd, and Rb–Sr geochronology and the routine isotope analysis of sub-ng amounts of Hf by MC-ICP-MS." Journal of Analytical Atomic Spectrometry 30, no. 12 (2015): 2554. http://dx.doi.org/10.1039/c5ja90054a.

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Correction for ‘A rapid and efficient ion-exchange chromatography for Lu–Hf, Sm–Nd, and Rb–Sr geochronology and the routine isotope analysis of sub-ng amounts of Hf by MC-ICP-MS’ by R. Bast et al., J. Anal. At. Spectrom., 2015, 30, 2323–2333.

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3

Serov, P. A. "Pt-bearing Fedorovo-Pansky Layered Complex (Kola Peninsula): Sm-Nd geochronology and Nd-Sr characteristics." IOP Conference Series: Earth and Environmental Science 539 (August 13, 2020): 012166. http://dx.doi.org/10.1088/1755-1315/539/1/012166.

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4

Cutts, K. A., K. A. Maneiro, G. Stevens, and E. F. Baxter. "Metamorphic evolution for the Inyoni shear zone: Investigating the geodynamic evolution of a 3.20 Ga terrane boundary in the Barberton granitoid greenstone terrane, South Africa." South African Journal of Geology 124, no. 1 (March 1, 2021): 163–80. http://dx.doi.org/10.25131/sajg.124.0009.

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Abstract The Inyoni shear zone represents an important tectonic boundary between (i) the ca. 3.45 Ga high-pressure amphibolite facies, granite-greenstone domain south of the Barberton greenstone belt, termed the Stolzburg terrane, and (ii) the ca. 3.29 to 3.23 Ga rocks of the trondhjemitic Badplaas pluton to the west. The Stolzburg terrane is separated from the greenschist facies rocks of the rest of the Barberton greenstone belt by the Komati fault, which records >10 km uplift of the Stolzburg terrane relative to the lower-grade rocks of the greenstone belt at ca. 3.23 Ga. A number of studies within the Stolzburg terrane have documented high-pressure amphibolite facies metamorphism that occurred concurrently with exhumation, with the lowest apparent geothermal gradients documented in the Inyoni shear zone, where strong constraints on the age of metamorphism are most limited. In addition, different studies on Inyoni metamorphism have produced significantly different temperature estimates. This study utilizes garnet Sm-Nd geochronology in combination with P-T modelling to directly date the metamorphism and re-evaluate the P-T conditions of the Inyoni shear zone. Two petrologically distinct samples produce similar P-T evolutions. A heterogeneous sample with both garnet-bearing and garnet-absent domains gives up-P evolutions reaching conditions of 550 to 675°C and 7 to 10 kbar, whereas a homogenous sample containing garnet and clinopyroxene produces a similar dominantly up-P evolution reaching peak conditions of 650°C and 8 to 10 kbar. Sm-Nd garnet ages of 3 201.6 ± 4.7 Ma (MSWD = 1.02) and 3 200.3 ± 5.3 Ma (MSWD = 0.44) were obtained from two samples of the homogenous garnet and clinopyroxene-bearing amphibolite. The Sm-Nd garnet geochronology provides accurate ages for the metamorphism of the Inyoni shear zone, with age results suggesting activity on the Inyoni shear zone may have continued after the regional metamorphism at ca. 3.23 Ga previously established by zircon U-Pb geochronology. However, 147Sm decay constant uncertainty leaves open the possibility that Inyoni garnet growth could have coincided with the previously recognized 3.23 Ga regional metamorphism.

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5

Wang, Zepeng, Qinping Tan, Yong Xia, Jianzhong Liu, Chengfu Yang, Songtao Li, Junhai Li, et al. "Sm–Nd Isochron Age Constraints of Au and Sb Mineralization in Southwestern Guizhou Province, China." Minerals 11, no. 2 (January 21, 2021): 100. http://dx.doi.org/10.3390/min11020100.

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Southwestern Guizhou, China, is famous for hosting clusters of Carlin-type Au, Sb, and Hg-Tl deposits. These deposits are thought to be the products of a low-temperature hydrothermal metallogenic event. Calcite and fluorite are common and widespread gangue minerals in Au and Sb deposits, respectively. Ore-related calcite commonly coexists with stibnite, realgar, and orpiment at the periphery of high-grade orebodies in Au deposits, while ore-related fluorite is generally intergrown with stibnite in Sb deposits. In this study, ore-related calcite and fluorite samples from representative Au (Zimudang) and Sb (Dachang) deposits, respectively, were separated, and the rare earth element (REE) concentrations, Sm/Nd isotope ratios, and Sm–Nd isochron ages were analyzed. This study aims to determine the formation ages of the calcite and fluorite and to constrain the age of low-temperature metallogenic event in Southwestern Guizhou. The calcite and fluorite samples contain relatively high total concentrations of REEs (8.21–22.5 μg/g for calcite, 21.7–36.6 μg/g for fluorite), exhibit variable Sm/Nd ratios (0.51–1.01 for calcite, 0.35–0.49 for fluorite), and yield Sm–Nd isochron ages of 148.4 ± 4.8 and 141 ± 20 Ma, respectively. These ages are consistent with the age range constrained by the low-temperature thermochronology of zircon (132–160 Ma), crosscutting relationships of stratigraphy or intrusions (96–160 Ma), and previous dating results (135–150 Ma) in Southwestern Guizhou. Collectively, the ages obtained in this study add new evidence to previous geochronology studies, such that the low-temperature hydrothermal mineralization in Southwestern Guizhou can be constrained to 135–150 Ma, corresponding to the Yanshanian orogeny, which was associated with a weak extensional tectonic environment.

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6

Pollington, Anthony D., and Ethan F. Baxter. "High precision microsampling and preparation of zoned garnet porphyroblasts for Sm–Nd geochronology." Chemical Geology 281, no. 3-4 (February 2011): 270–82. http://dx.doi.org/10.1016/j.chemgeo.2010.12.014.

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7

Wendlandt, Eric, Donald J. DePaolo, and W. Scott Baldridge. "Thermal history of Colorado Plateau lithosphere from Sm-Nd mineral geochronology of xenoliths." Geological Society of America Bulletin 108, no. 7 (July 1996): 757–67. http://dx.doi.org/10.1130/0016-7606(1996)108<0757:thocpl>2.3.co;2.

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8

Pollington, Anthony D., and Ethan F. Baxter. "High resolution Sm–Nd garnet geochronology reveals the uneven pace of tectonometamorphic processes." Earth and Planetary Science Letters 293, no. 1-2 (April 2010): 63–71. http://dx.doi.org/10.1016/j.epsl.2010.02.019.

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9

GIOIA, S. M. C. L., and M. M. PIMENTEL. "The Sm-Nd isotopic method in the geochronology laboratory of the University of Brasília." Anais da Academia Brasileira de Ciências 72, no. 2 (June 2000): 219–45. http://dx.doi.org/10.1590/s0001-37652000000200009.

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10

Taylor, P. N., J. D. Kramersb, S. Moorbatha, J. F. Wilson, J. L. Orpen, and A. Martin. "Pb/Pb, SmNd and RbSr geochronology in the Archean Craton of Zimbabwe." Chemical Geology: Isotope Geoscience section 87, no. 3-4 (October 1991): 175–96. http://dx.doi.org/10.1016/0168-9622(91)90020-w.

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11

SAMSON, SCOTT D., and RICHARD S. D’LEMOS. "U–Pb geochronology and Sm–Nd isotopic composition of Proterozoic gneisses,Channel Islands, UK." Journal of the Geological Society 155, no. 4 (July 1998): 609–18. http://dx.doi.org/10.1144/gsjgs.155.4.0609.

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12

FISCHEL, DANIELLE P., MÁRCIO M. PIMENTEL, REINHARDT A. FUCK, and RICHARD ARMSTRONG. "U-Pb SHRIMP and Sm-Nd geochronology of the Silvânia Volcanics and Jurubatuba Granite: juvenile Paleoproterozoic crust in the basement of the Neoproterozoic Brasília Belt, Goiás, central Brazil." Anais da Academia Brasileira de Ciências 73, no. 3 (September 2001): 445–60. http://dx.doi.org/10.1590/s0001-37652001000300012.

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U-Pb SHRIMP and Sm-Nd isotopic ages were determined for felsic metavolcanic rocks from the Silvânia Sequence and Jurubatuba Granite in the central part of the Brasília Belt. Zircon grains from a metavolcanic sample yielded 2115 ± 23 Ma and from the granite yielded 2089 ± 14 Ma, interpreted as crystallization ages of these rocks. Six metavolcanic samples of the Silvânia Sequence yielded a six-point whole-rock Sm-Nd isochron indicating a crystallization age of 2262 ± 110 Ma and positive epsilonNd(T) = +3.0 interpreted as a juvenile magmatic event. Nd isotopic analyses on samples from the Jurubatuba Granite have Paleoproterozoic T DM model ages between 2.30 and 2.42 Ga and epsilonNd(T) values vary between -0.22 and -0.58. The oldest T DM value refers to a sedimentary xenolith in the granite. These results suggest crystallization ages of Silvânia volcanics and Jurubatuba Granite are the first evidence of a ca. 2.14-2.08 juvenile magmatic event in the basement of the central part of the Brasília Belt that implies the presence of arc/suture hidden in reworked basement of the Brasília Belt.

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13

Gao, Jian, Sheng He, Jian-xin Zhao, Zhiliang He, Changwu Wu, Yuexing Feng, Ai Duc Nguyen, Jiaxi Zhou, and Zhixing Yi. "Sm-Nd isochron dating and geochemical (rare earth elements, 87Sr/86Sr, δ18O, δ13C) characterization of calcite veins in the Jiaoshiba shale gas field, China: Implications for the mechanisms of vein formation in shale gas systems." GSA Bulletin 132, no. 7-8 (December 17, 2019): 1722–40. http://dx.doi.org/10.1130/b32015.1.

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Abstract The Wufeng and Longmaxi organic-rich shales host the largest shale gas plays in China. This study examined the petrography, rare earth element (REE) and other trace-element geochemistry, Sm-Nd geochronology, and isotope geochemistry (87Sr/86Sr, δ18O, δ13C) of fracture-cementing minerals within core samples of the Wufeng and Longmaxi Formations from the Jiaoshiba shale gas field in order to (1) characterize the mineral phases occurring in the veins (mineralized fractures); (2) determine the ages of the calcite by the Sm-Nd isochron dating method; (3) understand the sources of calcite-precipitating fluids; and (4) explore the possible mechanisms responsible for calcite vein formation in shale gas systems. The fractures hosted in the Longmaxi Formation are mineralized with quartz as the predominant fracture cement, and calcite as an intracementation phase postdating the earlier quartz cement. In contrast, the fractures hosted in the Wufeng Formation are dominantly mineralized by calcite, which occurs either as the only cement present or as a cement phase predating later quartz cement. Calcite veins within the Longmaxi Formation have a Sm-Nd isochron age of 160 ± 13 Ma and δ13C values of –4.71‰ to –3.11‰, δ18O values of 17.1‰–17.4‰, and 87Sr/86Sr values of 0.72437–0.72869. Calcite veins within the Wufeng Formation yielded a Sm-Nd isochron age of 133 ± 15 Ma and are characterized by δ13C values of –2.29‰ to –1.03‰, δ18O values of 17.3‰–17.7‰, and 87Sr/86Sr values of 0.72202–0.72648. The similarity between 87Sr/86Sr values of the calcite and those of their respective surrounding host rocks (0.72670–0.72875 of the Longmaxi shales; 0.72030–0.72648 of the Wufeng shales), combined with relatively depleted δ13C and uniform fluid δ18O isotopic features, indicates that the calcite-precipitating fluids within the Wufeng and Longmaxi Formations were derived largely from their respective surrounding host-rock sources. REE data equally indicate that the distinguishable Eu anomalies (6.20–19.35; 4.45–11.91), Y anomalies (1.03–1.50; 1.44–1.70), and Y/Ho ratios (28.80–39.16; 38.86–45.18) of calcite veins within the Longmaxi and Wufeng Formations were controlled by their respective surrounding host rocks. The Sm-Nd isochron ages and fluid inclusion data of fracture cements suggest that fracture opening and calcite precipitation in composite veins within the Wufeng and Longmaxi Formations were triggered by gas generation overpressurization.

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14

JianTang, PENG, WANG Chuan, LI YuKun, HU A'Xiang, LU YuLong, and CHEN XianJia. "Geochemical characteristics and Sm-Nd geochronology of scheelite in the Baojinshan ore district, central Hunan." Acta Petrologica Sinica 37, no. 3 (2021): 665–82. http://dx.doi.org/10.18654/1000-0569/2021.03.02.

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15

Ducharme, Yan, Ross K. Stevenson, and Nuno Machado. "Sm–Nd geochemistry and U–Pb geochronology of the Preissac and Lamotte leucogranites, Abitibi Subprovince." Canadian Journal of Earth Sciences 34, no. 8 (August 1, 1997): 1059–71. http://dx.doi.org/10.1139/e17-086.

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The Lacorne Block in the Southern Volcanic Zone of the Abitibi Subprovince is composed of interleaved metavolcanic and metasedimentary rocks that are intruded by syn- to posttectonic diorites, granodiorites, and granites. These rocks form the Lacorne, Lamotte, and Preissac plutons, which can be divided into an early suite of dioritic–granodioritic rocks and a later suite of S-type, leucocratic granites with an estimated age of 2640 Ma. This study presents Sm–Nd data and U–Pb monazite and titanite ages for the late leucocratic granites of the Preissac and Lamotte plutons. A biotite–muscovite monzogranitic phase of the Lamotte pluton is dated at 2647 ± 2 Ma, but similar phases of the Preissac pluton are dated at 2681–2660 Ma. These ages extend the period of leucogranitic plutonism for this area to 40 Ma and suggest that the age of collision of the Abitibi and the Pontiac subprovinces occurred before 2685 Ma. The εNd values for the leucogranites range from −1 to +3 and suggest an origin largely through melting of sediments having a juvenile isotopic signature (i.e., a short crustal residence time). Possible sources of the leucogranites include metasedimentary rocks of the Pontiac Subprovince, the Lacorne Block, and the Southern Abitibi Volcanic Zone, but the εNd values of the granites are most consistent with melting of metasediments of the Southern Volcanic Zone. We suggest that sediments of the Southern Volcanic Zone formed an accretionary prism along the southern continental margin of the Abitibi before collision with the Pontiac Subprovince. This prism was subsequently trapped between the two colliding margins, subducted, and partially melted to produce the Lamotte, Preissac, and Lacorne leucogranites.

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16

Smit, Matthijs A., Erik E. Scherer, and Klaus Mezger. "Lu–Hf and Sm–Nd garnet geochronology: Chronometric closure and implications for dating petrological processes." Earth and Planetary Science Letters 381 (November 2013): 222–33. http://dx.doi.org/10.1016/j.epsl.2013.08.046.

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17

Vrublevskii, V. V., I. F. Gertner, G. Gutiérrez-Alonso, M. Hofmann, O. M. Grinev, and P. A. Tishin. "Isotope (U–Pb, Sm–Nd, Rb–Sr) geochronology of alkaline basic plutons of the Kuznetsk Alatau." Russian Geology and Geophysics 55, no. 11 (November 2014): 1264–77. http://dx.doi.org/10.1016/j.rgg.2014.10.002.

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18

Fletcher, I. R., K. J. R. Rosman, and W. G. Libby. "Sm-Nd, Pb-Pb and Rb-Sr geochronology of the manfred complex, Mount Narryer, Western Australia." Precambrian Research 38, no. 4 (April 1988): 343–54. http://dx.doi.org/10.1016/0301-9268(88)90032-0.

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19

Kullerud, Lars, and Sven H. Dahlgren. "SmNd geochronology of Sveconorwegian granulite facies mineral assemblages in the Bamble Shear Belt, South Norway." Precambrian Research 64, no. 1-4 (December 1993): 389–402. http://dx.doi.org/10.1016/0301-9268(93)90089-k.

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20

Babinski, Marly, Farid Chemale, W. R. Van Schmus, Leo Afrâneo Hartmann, and Luiz Carlos Da Silva. "U-Pb and Sm-Nd geochronology of the neoproterozoic granitic-gneissic Dom Feliciano belt, Southern Brazil." Journal of South American Earth Sciences 10, no. 3-4 (May 1997): 263–74. http://dx.doi.org/10.1016/s0895-9811(97)00021-7.

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21

De Laeter, J. R., I. R. Fletcher, M. J. Bickle, J. S. Myers, W. G. Libby, and I. R. Williams. "Rb‐Sr, Sm‐Nd and Pb‐Pb geochronology of ancient gneisses from Mt Narryer, Western Australia." Australian Journal of Earth Sciences 32, no. 4 (December 1985): 349–58. http://dx.doi.org/10.1080/08120098508729338.

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22

Cao, Xiaofeng, Xiang Gao, Xinbiao Lü, Qie Qin, Shentai Liu, Chao Chen, Ruiqing Guo, Bin Zhang, and Qitao Hu. "Sm–Nd geochronology and geochemistry of a Neoproterozoic gabbro in the Kuluketage block, north-western China." International Geology Review 54, no. 8 (December 20, 2011): 861–75. http://dx.doi.org/10.1080/00206814.2011.639946.

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23

Prevec, S. A. "Sm–Nd isotopic evidence for crustal contamination in the ca. 1750 Ma Wanapitei Complex, western Grenville Province, Ontario." Canadian Journal of Earth Sciences 32, no. 4 (April 1, 1995): 486–95. http://dx.doi.org/10.1139/e95-041.

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The Wanapitei Complex consists of a variably metamorphosed gabbronorite lying immediately adjacent to the Grenville Front Boundary Fault. U–Pb zircon geochronology indicates a crystallization age of [Formula: see text] for a noritic component, with both Grenville-aged (ca. 1000 Ma) metamorphism and minor older inheritance indicated. Geochemical evidence is consistent with plagioclase–pyroxene fractionation, but indicates additional open-system behaviour. [Formula: see text] data indicate contamination of a depleted mantle by light rare earth element-enriched material during the Penokean. This was followed during emplacement by extensive contamination of the then isotopically near-chondritic magma with variable amounts of evolved Archean crustal material, on the order of 40% in extreme cases, generating εNd(1.75) values between 0 and −7.5.

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24

Villeneuve, M. E., R. J. Thériault, and G. M. Ross. "U–Pb ages and Sm–Nd signature of two subsurface granites from the Fort Simpson magnetic high, northwest Canada." Canadian Journal of Earth Sciences 28, no. 7 (July 1, 1991): 1003–8. http://dx.doi.org/10.1139/e91-091.

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Two undeformed biotite granites recovered from exploratory hydrocarbon drill holes that penetrated basement in the Fort Simpson magnetic high were analyzed for U–Pb zircon geochronology and Sm–Nd isotopic composition. Both samples give crystallization ages of 1845 Ma, with errors of less than 5 Ma. This age overlaps with the waning stages of magmatism in the Great Bear magmatic zone of Wopmay Orogen, 200 km to the east. One sample has an initial εNd of +1.3 and a TDM of 2.14 Ga, whereas the other yielded an initial εNd of −2.1 and a TDM of 2.45 Ga. The latter sample indicates that Early Proterozoic light rare-earth element enriched lithosphere with a crustal history dating back to at least 2.45 Ga is present in the subsurface west of Wopmay Orogen.

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25

Cheng, Hao. "Garnet Lu–Hf and Sm–Nd geochronology: a time capsule of the metamorphic evolution of orogenic belts." Geological Society, London, Special Publications 474, no. 1 (May 11, 2018): 47–67. http://dx.doi.org/10.1144/sp474.7.

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26

Hamamoto, Takuji, Yasuhito Osanai, and Yhiroo Kagami. "Sm–Nd, Rb–Sr and K–Ar geochronology of the Higo metamorphic terrane, west‐central Kyushu, Japan." Island Arc 8, no. 2 (June 1999): 323–34. http://dx.doi.org/10.1046/j.1440-1738.1999.00240.x.

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27

Klein, Evandro L., Candido A. V. Moura, and Bruno L. S. Pinheiro. "Paleoproterozoic Crustal Evolution of the São Luís Craton, Brazil: Evidence from Zircon Geochronology and Sm-Nd Isotopes." Gondwana Research 8, no. 2 (April 2005): 177–86. http://dx.doi.org/10.1016/s1342-937x(05)71116-3.

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28

Prince, Christophe I., Jan Kosler, Derek Vance, and Detlef Günther. "Comparison of laser ablation ICP-MS and isotope dilution REE analyses — implications for Sm–Nd garnet geochronology." Chemical Geology 168, no. 3-4 (August 2000): 255–74. http://dx.doi.org/10.1016/s0009-2541(00)00203-5.

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29

Gruau, Gerard, Herve Martin, Bernard Leveque, Raymond Capdevila, and Alain Marot. "Rb—Sr and Sm—Nd geochronology of lower Proterozoic granite—greenstone terrains in French Guiana, South America." Precambrian Research 30, no. 1 (August 1985): 63–80. http://dx.doi.org/10.1016/0301-9268(85)90029-4.

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30

Spandler, Carl, Johannes Hammerli, Peng Sha, Hannah Hilbert-Wolf, Yi Hu, Eric Roberts, and Mark Schmitz. "MKED1: A new titanite standard for in situ analysis of Sm–Nd isotopes and U–Pb geochronology." Chemical Geology 425 (May 2016): 110–26. http://dx.doi.org/10.1016/j.chemgeo.2016.01.002.

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31

Weerakoon, M. W. K., T. Miyazaki, K. Shuto, and H. Kagami. "Rb-Sr and Sm-Nd Geochronology of the Eppawala Metamorphic Rocks and Carbonatite, Wanni Complex, Sri Lanka." Gondwana Research 4, no. 3 (July 2001): 409–20. http://dx.doi.org/10.1016/s1342-937x(05)70340-3.

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32

Skora, Susanne, Lukas P. Baumgartner, Nancy J. Mahlen, Clark M. Johnson, Sébastien Pilet, and Eric Hellebrand. "Diffusion-limited REE uptake by eclogite garnets and its consequences for Lu–Hf and Sm–Nd geochronology." Contributions to Mineralogy and Petrology 152, no. 6 (August 30, 2006): 703–20. http://dx.doi.org/10.1007/s00410-006-0128-x.

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33

Smit, Matthijs A., Erik E. Scherer, Michael Bröcker, and Herman L. M. van Roermund. "Timing of eclogite facies metamorphism in the southernmost Scandinavian Caledonides by Lu–Hf and Sm–Nd geochronology." Contributions to Mineralogy and Petrology 159, no. 4 (August 28, 2009): 521–39. http://dx.doi.org/10.1007/s00410-009-0440-3.

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34

Sommer, Carlos Augusto, Felipe Padilha Leitzke, Evandro Fernandes de Lima, Carla Joana Santos Barreto, Jean Michel Lafon, Vinicius Matté, Ruy Paulo Philipp, Rommulo Vieira Conceição, and Miguel Ângelo Stipp Basei. "Zircon U-Pb geochronology, Sm-Nd and Pb-Pb isotope systematics of Ediacaran post-collisional high-silica Acampamento Velho volcanism at the Tupanci area, NW of the Sul-Rio-Grandense Shield, Brazil." Brazilian Journal of Geology 47, no. 4 (December 2017): 545–60. http://dx.doi.org/10.1590/2317-4889201720170064.

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ABSTRACT: We present new U-Pb zircon ages and Sm-Nd-Pb isotopic data for volcanic and hypabyssal acid rocks from the northernmost exposure of the Acampamento Velho Formation in the NW portion of the Sul-Rio-Grandense Shield, Brazil. The first volcanic episode, grouped in the high-Ti rhyolites from the Tupanci hill, shows age of 579 ± 5.6 Ma, which is in agreement with the post-collisional Acampamento Velho Formation volcanism in the Bom Jardim Group of the Camaquã Basin. A poorly constrained age of 558 +/- 39 Ma was obtained for rhyolites from the low-Ti group at the Picados Hill, which may indicate a younger acid volcanism, or a greater time span for the volcanism of the Acampamento Velho Formation in southernmost Brazil. Regarding magmatic sources, Sm/Nd isotopic data coupled to Pb isotopes and a review of trace element geochemistry indicate different amounts of Paleoproterozoic (Dom Feliciano, Pinheiro Machado Suite) to Neoproterozoic (Rio Vacacaí terrane) lower crust melting. Our data, coupled with literature data, contribute to a better understanding of the stratigraphic evolution for the Neoproterozoic post-collisional volcanic successions of the Camaquã Basin in the Sul-Rio-Grandense Shield.

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35

Zu, Xue, Dong, and Zhao. "Mineralogy and Garnet Sm–Nd Dating for the Hongshan Skarn Deposit in the Zhongdian Area, SW China." Minerals 9, no. 4 (April 19, 2019): 243. http://dx.doi.org/10.3390/min9040243.

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The Hongshan deposit is one of the largest Cu-polymetallic deposits in the Zhongdian area, southwest China. Two types of Cu–Mo ores, mainly developed in the skarns, have been recognized in the Hongshan deposit, i.e., massive or layered skarn and vein-type, with the former being dominant. The highly andraditic composition of garnet (Adr100 to Adr64Gr32) and diopsidic composition of pyroxene (Di90Hd9 to Di1Hd99) indicate the layered skarn ores are of magmatic-hydrothermal origin that formed under oxidized conditions. Sm–Nd dating of garnet yield a well-constrained isochron age of 76.48 ± 7.29 Ma (MSWD = 1.2) for the layered skarn ores. This age was consistent with the Re–Os age for the pyrrhotite from the layered skarn ores, and thereby indicated that the layered skarn mineralization was formed in the Late Cretaceous, rather than in the Triassic as was previously thought. The coincidence of the geochronology from the layered skarn ores and vein-type mineralization further indicated that both ores were the result of a single genetic event, rather than multiple events. The recognition of the Late Cretaceous post-collisional porphyry–skarn Cu–Mo–W belt in the Zhongdian area exhibited a promising prospecting potential.

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36

Li, Yang, and Pieter Vermeesch. "Short communication: Inverse isochron regression for Re–Os, K–Ca and other chronometers." Geochronology 3, no. 2 (August 2, 2021): 415–20. http://dx.doi.org/10.5194/gchron-3-415-2021.

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Abstract. Conventional Re–Os isochrons are based on mass spectrometric estimates of 187Re/188Os and 187Os/188Os, which often exhibit strong error correlations that may obscure potentially important geological complexity. Using an approach that is widely accepted in 40Ar/39Ar and U–Pb geochronology, we here show that these error correlations are greatly reduced by applying a simple change of variables, using 187Os as a common denominator. Plotting 188Os/187Os vs. 187Re/187Os produces an “inverse isochron”, defining a binary mixing line between an inherited Os component whose 188Os/187Os ratio is given by the vertical intercept, and the radiogenic 187Re/187Os ratio, which corresponds to the horizontal intercept. Inverse isochrons facilitate the identification of outliers and other sources of data dispersion. They can also be applied to other geochronometers such as the K–Ca method and (with less dramatic results) the Rb–Sr, Sm–Nd and Lu–Hf methods. Conventional and inverse isochron ages are similar for precise datasets but may significantly diverge for imprecise ones. A semi-synthetic data simulation indicates that, in the latter case, the inverse isochron age is more accurate. The generalised inverse isochron method has been added to the IsoplotR toolbox for geochronology, which automatically converts conventional isochron ratios into inverse ratios, and vice versa.

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Maneiro, Kathryn A., Ethan F. Baxter, Scott D. Samson, Horst R. Marschall, and Jack Hietpas. "Detrital garnet geochronology: Application in tributaries of the French Broad River, Southern Appalachian Mountains, USA." Geology 47, no. 12 (October 15, 2019): 1189–92. http://dx.doi.org/10.1130/g46840.1.

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Abstract Nineteen single-grain detrital garnet ages from a tributary to the French Broad River (North Carolina, USA) establish a novel approach to Sm-Nd detrital garnet geochronology wherein the equilibrium bulk-rock composition lost during weathering and transport is replaced with the composition of inclusions leached from within each garnet grain. Detrital garnet ages were compared to published detrital zircon and monazite ages from the same river tributary system. Results show that 87% of the zircons have inherited Proterozoic ages; only zircon rims give Paleozoic ages. Monazites are exclusively Ordovician (weighted average: 460.9 ± 3.0 Ma). Our new detrital garnet ages (and the detrital zircon rims) record younger ages spanning the Late Ordovician to Early Devonian, likely reflecting prolonged metamorphic heating. The weighted average age of the detrital garnet population is Silurian (430.1 ± 7.2 Ma). Statistical tests confirm that the garnet population is younger than the monazite. The new detrital garnet ages illuminate a previously uninterpreted Silurian tectonometamorphic signal in this region.

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Bast, R., E. E. Scherer, P. Sprung, M. Fischer-Gödde, A. Stracke, and K. Mezger. "A rapid and efficient ion-exchange chromatography for Lu–Hf, Sm–Nd, and Rb–Sr geochronology and the routine isotope analysis of sub-ng amounts of Hf by MC-ICP-MS." Journal of Analytical Atomic Spectrometry 30, no. 11 (2015): 2323–33. http://dx.doi.org/10.1039/c5ja00283d.

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Karaoğlan, Fatih, Osman Parlak, Urs Klötzli, Martin Thöni, and Friedrich Koller. "U–Pb and Sm–Nd geochronology of the ophiolites from the SE Turkey: implications for the Neotethyan evolution." Geodinamica Acta 25, no. 3-4 (December 2012): 146–61. http://dx.doi.org/10.1080/09853111.2013.858948.

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YANG, Yaomin. "Sm-Nd isotopic geochronology of the Yinachang Fe-Cu-REE deposit at Wuding, YunnanProvince and its genetic significance." Chinese Science Bulletin 50, no. 18 (2005): 2090. http://dx.doi.org/10.1360/04wd0145.

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Zhang, Zhenjie, Renguang Zuo, and Qiuming Cheng. "The mineralization age of the Makeng Fe deposit, South China: implications from U–Pb and Sm–Nd geochronology." International Journal of Earth Sciences 104, no. 3 (November 11, 2014): 663–82. http://dx.doi.org/10.1007/s00531-014-1096-4.

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42

D'el-Rey Silva, Luiz José Homem, Elton Luiz Dantas, João Batista Guimarães Teixeira, Jorge Henrique Laux, and Maria da Glória da Silva. "U–Pb and Sm–Nd geochronology of amphibolites from the Curaçá Belt, São Francisco Craton, Brazil: Tectonic implications." Gondwana Research 12, no. 4 (November 2007): 454–67. http://dx.doi.org/10.1016/j.gr.2006.11.008.

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43

Cheng, Hao, Jeffrey D. Vervoort, Besim Dragovic, Diane Wilford, and Lingmin Zhang. "Coupled Lu–Hf and Sm–Nd geochronology on a single eclogitic garnet from the Huwan shear zone, China." Chemical Geology 476 (January 2018): 208–22. http://dx.doi.org/10.1016/j.chemgeo.2017.11.018.

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44

Stewart, E. M., Ethan F. Baxter, and Jay J. Ague. "Initiation and duration of Grampian orogenesis constrained by refined Sm–Nd garnet geochronology of the Ballantrae ophiolite, Scotland." Journal of the Geological Society 174, no. 6 (June 5, 2017): 968–78. http://dx.doi.org/10.1144/jgs2017-010.

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45

Buchwaldt, Robert, Theofilos Toulkeridis, Wolfgang Todt, and Elias K. Ucakuwun. "Crustal age domains in the Kibaran belt of SW-Uganda: Combined zircon geochronology and Sm–Nd isotopic investigation." Journal of African Earth Sciences 51, no. 1 (April 2008): 4–20. http://dx.doi.org/10.1016/j.jafrearsci.2007.11.001.

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46

Rankenburg, K., A. D. Brandon, and M. D. Norman. "A Rb–Sr and Sm–Nd isotope geochronology and trace element study of lunar meteorite LaPaz Icefield 02205." Geochimica et Cosmochimica Acta 71, no. 8 (April 2007): 2120–35. http://dx.doi.org/10.1016/j.gca.2007.01.014.

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47

Wang, Jianping, Xiu Wang, Jiajun Liu, Zhenjiang Liu, Degao Zhai, and Yinhong Wang. "Geology, Geochemistry, and Geochronology of Gabbro from the Haoyaoerhudong Gold Deposit, Northern Margin of the North China Craton." Minerals 9, no. 1 (January 21, 2019): 63. http://dx.doi.org/10.3390/min9010063.

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The Haoyaoerhudong gabbro is a mafic intrusion located in the Haoyaoerhudong gold deposit, which is a giant gold deposit (148 t Au) hosted in Proterozoic strata on the northern margin of the North China Craton. In this paper, we present integrated SHRIMP U–Pb, geochemical and Sr–Nd isotopic data from gabbro of the Haoyaoerhudong gold deposit to reveal the magmatic processes behind its origin. SHRIMP zircon U–Pb dating constrains the timing of crystallization of the Haoyaoerhudong gabbro to 278.8 ± 0.81 Ma. Whole-rock geochemical results indicate that the Haoyaoerhudong gabbro has calc-alkaline features with enrichments of large-ion lithophile elements (LILE) and light rare-earth elements (REE) as well as depletions of high-field strength elements (HFSE). The relatively high (87Sr/86Sr)i (0.7053 to 0.7078) and low εNd(t) (−4.6 to −15.1) values of the gabbro indicate the involvement of crustal materials. Low Ce/Pb ratios (1.35 to 7.38), together with nearly constant La/Sm and Th/Yb ratios and variable Ba/Th and Sr/Nd ratios, suggest that the ancient mantle was modified by slab dehydration fluids. Based on new geochemical data and regional geological investigations, we propose that both the Haoyaoerhudong gold deposit and the Haoyaoerhudong gabbro formed in a post-orogenic extensional setting.

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Dunning, G. R., and T. E. Krogh. "Geochronology of ophiolites of the Newfoundland Appalachians." Canadian Journal of Earth Sciences 22, no. 11 (November 1, 1985): 1659–70. http://dx.doi.org/10.1139/e85-174.

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Precise U/Pb zircon ages (2σ errors) are reported for four ophiolite complexes from the Newfoundland Appalachians.Zircons from trondhjemite from Blow Me Down Mountain, Bay of Islands Complex, give an age of [Formula: see text] (five points). Those from gabbro from Blow Me Down Brook give a minimum 207Pb/206Pb age of 480 Ma (one point), confirming that this is the age of the main plutonic episode. These data refute previously determined latest Cambrian U/Pb zircon and Sm/Nd (mineral–rock isochron) ages of 504 ± 10 and 505 Ma for the complex.Gabbro from the Betts Cove Complex yielded zircon that gives an age of [Formula: see text] (four points). This refutes the interpretation of an earlier U/Pb (zircon) age of 463 ± 6 Ma for a trondhjemite dyke as the age of the ophiolite. It was inconsistent with the presence of Arenigian graptolites in the overlying Snooks Arm Group.Two zircon ages from a pegmatitic and medium-grained trondhjemite of the Annieopsquotch Complex are [Formula: see text] (five points) and [Formula: see text] (two points). Zircon from trondhjemite of the Pipestone Pond Complex of central Newfoundland gives an age of [Formula: see text] (five points). Analysis of a single zircon fraction from the Coy Pond Complex gives a minimum 207pb/206pb age of 489 MaThe ages are comparable to those of the Lushes Bight Terrane, Newfoundland, the M'Clintock West Massif, Arctic Canada, and the Ballantrae Complex, Scotland, and together span 18 Ma of the Tremadocian and Arenigian stages. This short age range may imply that only young "hot" oceanic crust was emplaced and preserved in the Appalachian–Caledonian mountain belt.

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KARAOĞLAN, FATIH, OSMAN PARLAK, URS KLÖTZLI, MARTIN THÖNI, and FRIEDRICH KOLLER. "U–Pb and Sm–Nd geochronology of the Kızıldağ (Hatay, Turkey) ophiolite: implications for the timing and duration of suprasubduction zone type oceanic crust formation in the southern Neotethys." Geological Magazine 150, no. 2 (October 23, 2012): 283–99. http://dx.doi.org/10.1017/s0016756812000477.

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AbstractThe Kızıldağ (Hatay) ophiolite in Turkey represents remnants of the southern Neotethyan ocean and is characterized by a complete ocean lithospheric section. It formed in a fore-arc setting above a N-dipping intraoceanic subduction zone, and represents the undeformed, more northerly part of the same thrust sheet that also forms the Baer–Bassit ophiolite to the south. The ophiolite was emplaced southwards from the southerly Neotethyan ocean in Maastrichtian time. U–Pb and Sm–Nd dates are used to constrain the crystallization age and duration of magmatic activity of the Kızıldağ ophiolite. U–Pb dating yielded ages of 91.7 ± 1.9 Ma for a plagiogranite and 91.6 ± 3.8 Ma for a cumulate gabbro. The cumulate gabbro also yielded a Sm–Nd isochron age of 95.3 ± 6.9 Ma. The measured ages suggest that the oceanic crust of the Kızıldağ ophiolite formed in a maximum time period of 6 Ma, and that the plagiogranite may have formed later than the gabbroic section. The U–Pb zircon ages from the Kızıldağ ophiolite and the cooling age of a metamorphic sole beneath the Baer–Bassit ophiolite are indistinguishable within the analytical uncertainties. This indicates the presence of young and hot oceanic lithosphere at the time of intraoceanic subduction/thrusting in the southern Neotethys. The U–Pb zircon ages from the Kızıldağ, the Troodos and the Semail ophiolites overlap within analytical uncertainties, suggesting that these ophiolites are contemporaneous and genetically and tectonically related within the same Late Cretaceous southern Neotethyan ocean.

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He, Zhiliang, Jian Gao, Shuangjian Li, and Sheng He. "Mineralization of MVT Pb-Zn Deposits in the Process of Hydrocarbon Accumulation and Destruction in the Strong Structural Deformation Area of Eastern Sichuan, South China." Minerals 12, no. 10 (October 12, 2022): 1281. http://dx.doi.org/10.3390/min12101281.

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The Mississippi Valley-type (MVT) Pb-Zn deposits and hydrocarbon reservoirs coexist around the margin of the eastern Sichuan basin. This study examined the fluid inclusions, Sr isotope and systematic Rb-Sr, Sm-Nd geochronology for the distinct ore and gangue minerals of four orebodies from two MVT Pb-Zn deposits in the margin of the eastern Sichuan basin, combined with the existing research foundation of oil and gas accumulation and evolution, which was designed to understand the internal relationship between oil and gas accumulation and the involvement of organic matter in metal mineralization. High-density methane, moderate temperature, and salinity inclusions were discovered in the studied MVT Pb-Zn deposits, combined with relatively higher 87Sr/86Sr ratios (0.71088~0.714749), indicating that the ore-forming fluids were derived largely from the hydrocarbon associated basinal brines. Rb-Sr isochron of paragenetic sphalerites and pyrites and Sm-Nd isochron of paragenetic fluorites and calcite from the studied MVT Pb-Zn deposits define isochron ages of 144.5 Ma~138.5 Ma, and 147.6 Ma, respectively, indicating that the Late Jurassic to Early Cretaceous Yanshanian orogeny was an important metallogenic event in the margin of the eastern Sichuan basin. The close temporal and spatial relationship between the MVT mineralization and hydrocarbon accumulation and destruction in the strong structural deformation area of the margin of the eastern Sichuan basin allows us to propose a possible model in which the Yanshanian compressional tectonics drove a large-scale flow of metal- and sulfate- bearing basinal fluids passed under or through methane-bearing carbonate reservoirs, resulting in the MVT mineralization and hydrocarbon accumulation and destruction.

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