滇西点苍山新元古代斜长角闪岩的成因：来自锆石U-Pb年龄和全岩地球化学的证据

麻艺超; 蔡永丰; 马莉燕; 周云; 赵锴

doi:10.3799/dqkx.2020.288

Volume 46 Issue 8

Aug. 2021

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Ma Yichao, Cai Yongfeng, Ma Liyan, Zhou Yun, Zhao Kai, 2021. Genesis of Neoproterozoic Amphibolite in Diancangshan, West Yunnan: Evidence from Zircon U-Pb Age and Whole-Rock Geochemistry. Earth Science, 46(8): 2860-2872. doi: 10.3799/dqkx.2020.288

Citation:

Ma Yichao, Cai Yongfeng, Ma Liyan, Zhou Yun, Zhao Kai, 2021. Genesis of Neoproterozoic Amphibolite in Diancangshan, West Yunnan: Evidence from Zircon U-Pb Age and Whole-Rock Geochemistry. Earth Science, 46(8): 2860-2872. doi: 10.3799/dqkx.2020.288

Citation:

Ma Yichao, Cai Yongfeng, Ma Liyan, Zhou Yun, Zhao Kai, 2021. Genesis of Neoproterozoic Amphibolite in Diancangshan, West Yunnan: Evidence from Zircon U-Pb Age and Whole-Rock Geochemistry. Earth Science, 46(8): 2860-2872. doi: 10.3799/dqkx.2020.288

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Genesis of Neoproterozoic Amphibolite in Diancangshan, West Yunnan: Evidence from Zircon U-Pb Age and Whole-Rock Geochemistry

doi: 10.3799/dqkx.2020.288

Ma Yichao^{1
,
,},
Cai Yongfeng^{1, 2
,
,
,},
Ma Liyan¹,
Zhou Yun¹,
Zhao Kai¹

1.
Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology, Guilin 541004, China
2.
Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi, Guilin University of Technology, Guilin 541004, China

Received Date: 2020-07-05
Available Online: 2021-09-14
Publish Date: 2021-08-15

Abstract

Abstract

The current research on Neoproterozoic magmatism on the southwestern Yangtze Block is still weak, which restricts the complete understanding of the Neoproterozoic tectonic evolution of the South China Plate. Detailed zircon U-Pb geochronological and whole-rock geochemical analyses of amphibolite in the Diancangshan area in western Yunnan were carried out in this study. The amphibolite samples can be divided into two groups based on their Nb/La ratios. Group 1 has Nb/La ratios of 0.75-0.76, greater than 0.5, resembling those of Nb-enriched basalt, while Group 2 has Nb/La ratios of 0.20-0.21, and shows obvious negative Nb and Ta anomalies, and thus are similar to those of arc basalt. The group 1 samples have SiO₂ contents of 52.4%-52.6%, MgO of 4.1%-4.2%, FeO_t of 8.7%-8.8%, and Mg^# of 53. The group 2 samples are characterized by lower SiO₂ contents (47.4%-47.5%), and higher MgO (5.4%-5.5%), FeO_t (9.8%-9.9%) contents, and Mg^# (57). Both of the two group samples show slightly high degree of fractionation. The group 1 samples have (La/Yb)_cn ratios of 3.0-3.2, and (Gd/Yb)_cn ratios of 1.42-1.51, and show negative Eu anomalies (δEu=0.75-0.76). The group 2 samples have (La/Yb)_cn ratios of 14.0-14.3, and (Gd/Yb)_cn ratios of 1.85-1.93, and show unobvious Eu anomalies (δEu=0.99-1.13). LA-ICP-MS zircon U-Pb dating results show that two representative amphibolite samples yield ages of 764±6 Ma and 779±9 Ma, suggesting that there is mafic magmatic activity in the Diancangshan area during the Neoproterozoic. Integrated with regional data, the amphibolite was likely to be produced in a back-arc basin which was caused by oceanic crustal subduction along the southwestern Yangtze Block in the Neoproterozoic.
- zircon U-Pb dating,
- amphibolite,
- back-arc basin,
- Neoproterozoic,
- Diancangshan,
- geochronology,
- geochemistry

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References(56)

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Genesis of Neoproterozoic Amphibolite in Diancangshan, West Yunnan: Evidence from Zircon U-Pb Age and Whole-Rock Geochemistry

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