Zircon U–Pb Ages and Geochemistry of Granite Porphyries in the Yangla Cu Deposit, SW China: Constraints on Petrogenesis and Tectonic Evolution of the Jinshajiang Suture Belt

Geofluids - Tập 2020 - Trang 1-35 - 2020
Bo Li1, Xinfu Wang1, Li‐Juan Du2, Zuopeng Xiang1, Tang Guo1, Zhilong Huang3
1Faculty of Land and Resource Engineering, Kunming University of Science and Technology, Kunming 650093, China
2College of Resources and Environmental Engineering, Guizhou University, Guiyang, 550025, China
3State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China

Tóm tắt

Located in the eastern part of the Tethyan tectonic domain, the Jinshajiang Suture Belt (JSB), northwestern Yunnan, China, is notable for its large-scale distribution of Jurassic to Triassic granitoids that are genetically related to the evolution of the Paleo-Tethys Ocean and polymetallic mineralization. In this study, geochronological and geochemical analyses were conducted on three samples of these granite porphyries (GPs) using laser ablation inductively coupled plasma mass spectrometry and zircon U–Pb aging to reveal ages of 213±15, 198.4±8.6, and 195.3±6.4 Ma, respectively. These ages are younger than the emplacement ages of the granodiorites, at 208–239 Ma, suggesting that magmatic activities in the Yangla mining district likely continued for ~44 Ma. These GPs are rich in large-ion lithophile elements such as Rb, Ba, Th, U, K, and La but are deficient in high field strength elements such as Ta, Nb, Ce, Zr, Hf, and Ti. Significant Pb enrichment and P depletion were noted, as were varying degrees of metallogenic element enrichment in the order of Cu>Pb>Zn. The total content of rare earth elements (ΣREEs) of the GPs is in the range of 50.41–127.27 ppm and the LREE/HREE ratio is in the rage of 4.46–10.54. The GPs are rich in LREEs, with a high degree of differentiation noted between the LREEs and HREEs. The δEu (EuN/Eu∗) and δCe (CeN/Ce∗) values, at 0.53–0.86 and 0.79–0.98, indicate weak and slightly weak negative anomalies, respectively. The geochemical characteristics of the GPs indicate that these bodies are slightly metaluminous to peraluminous S-type granites in a calc–alkaline series that formed in a late-collisional or postcollisional tectonic setting. Three-component mixing of magmas including those of upper crust, lower crust, and mantle materials in addition to subsequent partial melting could have been responsible for the generation of these GPs in an epithermal low-pressure setting at <5 kbar.

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Tài liệu tham khảo

2010

10.1016/j.lithos.2011.07.003

10.2113/econgeo.110.3.631

2011, Acta Petrologica Sinica, 2011, 27, 2553

10.1016/j.oregeorev.2017.01.026

2019, Resource Geology, 70, 28

2011

2010, Acta Petrologica Sinica, 26, 1833

1993

2003, Economic Geology, 98, 125

10.1016/j.oregeorev.2004.12.007

2011, Economic Geology, 106, 79, 10.2113/econgeo.106.1.79

10.1016/j.gr.2013.08.002

2012, Geotectonica et Metallogenia, 36, 248

10.2475/02.2013.02

10.1016/S1367-9120(00)00039-0

10.1029/2011tc002937

10.1016/j.lithos.2009.04.006

10.1016/j.jseaes.2007.11.006

10.1016/j.lithos.2012.04.020

10.1016/j.lithos.2012.02.006

1998

2014, Mineral Exploration, 5, 699

2000, Regional Geology of China, 19, 155

2012

2009, Acta Geologica Sinica, 83, 1415

2011, Acta Petrologica Sinica, 27, 2567

2016

1997, Geology and Mineral Resources of South China, 4, 50

2010, Earth Science-Journal of China University of Geosciences, 35, 186, 10.3799/dqkx.2010.019

1999, Geology and Mineral Resources of South China, 2, 1

2018, Earth Science Frontiers, 25, 092

2015

10.1111/rge.12006

2012

2012, Geoscience, 26, 229

2016, Gondwana Research, 40, 21, 10.1016/j.gr.2016.08.001

10.1016/S0009-2541(02)00195-X

2012, User's manual for Isoplot 3.75: a geochronological toolkit for Microsoft Excel

10.1016/j.chemgeo.2004.01.003

2000, Talanta, 51, 507, 10.1016/S0039-9140(99)00318-5

2004, Acta Petrologica Sinica, 20, 1007

1987, Contributions to Mineralogy and Petrology, 7, 205

2018, Minerals, 8, 1

10.1016/j.gr.2019.06.015

10.1016/j.oregeorev.2019.103119

10.1016/j.oregeorev.2009.03.003

10.1016/j.oregeorev.2015.11.024

10.1007/s11430-019-9595-8

2014, Soc Econ Geol Spec Publ, 18, 1

10.2113/gsecongeo.105.1.3

10.1155/2020/4391703

1999

10.1093/petrology/egm062

10.1016/0012-821X(76)90049-2

10.1016/j.oregeorev.2017.04.034

10.1007/BF00413167

2007, Acta Petrologica Sinica, 2007, 23, 1217

2020, Acta Geologica Sinica, 94, 1143

10.1016/j.lithos.2006.09.018

10.1016/j.jseaes.2009.05.004

2018, Earth Science Fronties, 25, 136

10.1016/S0024-4937(02)00222-0

1979, Geological Society of America Abstract with Programs, 11, 539

2003, Acta Geologica Sinica, 2003a, 77, 217

2003, Acta Geoscientia Sinica, 24, 337

2008

2006, Science in China Series D: Earth Sciences, 39, 123

10.1016/S0024-4937(99)00052-3

10.1016/S0024-4937(98)00024-3

10.1007/s11631-019-00316-2

10.1093/petrology/egm014

10.1016/0012-8252(94)90029-9

10.1016/0024-4937(80)90067-5

10.1016/0024-4937(89)90028-5

1993, New York: Longman Scientific and Technical, 58, 523

10.1017/S0016756800058222

10.1130/0016-7606(1989)101<0635:TDOG>2.3.CO;2

10.1144/GSL.SP.1989.042.01.19

10.1007/BF00402202

10.1144/GSL.SP.1984.016.01.06

10.1046/j.1525-1314.1999.00208.x

10.1017/S0263593300000985

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Geofluids

Tập 2020

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