黔南基性岩墙岩石地球化学、SHRIMP锆石U-Pb年代学及地质意义

祝明金; 田亚洲; 聂爱国; 张恒; 杨华燊

doi:10.3799/dqkx.2018.724

Volume 43 Issue 4

Apr. 2018

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Article Navigation > Earth Science > 2018 > 43(4): 1333-1349

Zhu Mingjin, Tian Yazhou, Nie Aiguo, Zhang Heng, Yang Huashen, 2018. Petrogeochemistry, Zircon SHRIMP U-Pb Geochronology of Mafic Dykes in South Guizhou and Their Geological Implications. Earth Science, 43(4): 1333-1349. doi: 10.3799/dqkx.2018.724

Citation:

Zhu Mingjin, Tian Yazhou, Nie Aiguo, Zhang Heng, Yang Huashen, 2018. Petrogeochemistry, Zircon SHRIMP U-Pb Geochronology of Mafic Dykes in South Guizhou and Their Geological Implications. Earth Science, 43(4): 1333-1349. doi: 10.3799/dqkx.2018.724

Citation:

Zhu Mingjin, Tian Yazhou, Nie Aiguo, Zhang Heng, Yang Huashen, 2018. Petrogeochemistry, Zircon SHRIMP U-Pb Geochronology of Mafic Dykes in South Guizhou and Their Geological Implications. Earth Science, 43(4): 1333-1349. doi: 10.3799/dqkx.2018.724

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Petrogeochemistry, Zircon SHRIMP U-Pb Geochronology of Mafic Dykes in South Guizhou and Their Geological Implications

doi: 10.3799/dqkx.2018.724

1.
College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China
2.
College of Resources and Environmental Engineering, Guizhou Institute of Technology, Guiyang 550003, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China

Received Date: 2017-12-20
Publish Date: 2018-04-15

Abstract

Abstract

The rocks of Emeishan large igneous province (ELIP) are mainly composed of mafic dykes, layered and ring mafic complex, high Ti and low Ti basalts. The major elements, trace elements, Sr-Nd isotopes and zircon SHRIMP U-Pb ages of mafic dykes from South Guizhou Province were studied in order to further determine the temporal link between ELIP and related mass extinction events and research the genesis of ELIP in this paper. Results show ∑REE=135.66×10^-6-280.59×10^-6, LREE/HREE=6.42-7.54, (La/Yb)_N=7.94-9.85, relatively enriched LREE to HREE, δEu=1.0-1.3, enriched LILE, such as Ba, K, Sr, depleted HFSE, such as Nb, Ta, Zr, Hf, displaying similar geochemical characteristics of Emeishan high Ti basalts. The similar ratios of Th/Ta(1.80-1.94), Nb/U(30.8-39.88), Th/La(0.08-0.10), Nb/Th(7.89-8.40) to primitive mantle, low (⁸⁷Sr/⁸⁶Sr)_i(0.705 278-0.706 052)), ε_Nd(t)(-0.5~+1.6) and Th/Ta(< 2.13) imply no obvious crustal contamination, and the mafic rocks may have been caused by 10%-12% partial melting of the garnet peridotite in their source region that interacted with the upwelling Emeishan plume at the periphery of the plume. The 261.2±2.6 Ma age of zircon SHRIMP U-Pb may imply that the ELIP formed by a mantle plume at~260 Ma and was one of the likely causes of the end-Guadalupian mass extinction.
- mafic dyke,
- petrology,
- geochemistry,
- zircon SHRIMP U-Pb age,
- Emeishan large igneous province,
- South Guizhou

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References(107)

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