西藏冈底斯西段鲁尔玛晚三叠世二长闪长岩的成因

刘洪; 张林奎; 黄瀚霄; 李光明; 欧阳渊; 吕梦鸿; 刘函; 兰双双; 闫国强

doi:10.3799/dqkx.2019.051

Volume 44 Issue 7

Jul. 2019

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Article Navigation > Earth Science > 2019 > 44(7): 2339-2352

Liu Hong, Zhang Linkui, Huang Hanxiao, Li Guangming, Ouyang Yuan, Lü Menghong, Liu Han, Lan Shuangshuang, Yan Guoqiang, 2019. Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China. Earth Science, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051

Citation:

Liu Hong, Zhang Linkui, Huang Hanxiao, Li Guangming, Ouyang Yuan, Lü Menghong, Liu Han, Lan Shuangshuang, Yan Guoqiang, 2019. Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China. Earth Science, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051

Citation:

Liu Hong, Zhang Linkui, Huang Hanxiao, Li Guangming, Ouyang Yuan, Lü Menghong, Liu Han, Lan Shuangshuang, Yan Guoqiang, 2019. Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China. Earth Science, 44(7): 2339-2352. doi: 10.3799/dqkx.2019.051

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Petrogenesis of Late Triassic Luerma Monzodiorite in Western Gangdise, Tibet, China

doi: 10.3799/dqkx.2019.051

1.
Chengdu Center, China Geological Survey, Chengdu 610081, China
2.
Sichuan Institute of Metallurgical Geology & Exploration, Chengdu 610051, China
3.
Tianjin Center, China Geological Survey, Tianjin 300170, China

Received Date: 2019-01-31
Publish Date: 2019-07-15

Abstract

Abstract

The study on the evolution model of the New Tethys Ocean in Yarlung Zangbo has been seriously restricted due to the lack of in-depth research on magmatism during and even before the Late Triassic In order to discuss the geodynamic background of the Late Triassic magmatism in Dajia Co area of western Gangdise, this paper presents a study on petrology, geochemistry and chronology of the Ruerma monzodiorite. LA-ICP-MS zircon U-Pb analyses suggest that monzodiorite has two weighted mean ²⁰⁶Pb/²³⁸U ages of 212.1±0.6 Ma (mean square weighted deviation=0.97), and 212.8±0.2 Ma (mean square weighted deviation=0.74), which suggests that the Luerma magmatism event took place during the late Triassic epoch. The rocks contain plagioclase, potassium feldspar and amphibole, and contain a small amount of quartz, pyroxene, biotite, magnetite and apatite. They have moderate contents of SiO₂ (50.75%-54.69%), and A1₂O₃ (13.77%-19.17%), high contents of K₂O (2.71%-3.99%), total K₂O+Na₂O (5.84%-8.65%), and CaO (4.90%-10.14%), with a Reitman index (σ₄₃) of 3.40 to 7.65, and A/CNK values of 0.56 to 1.00. These characteristics suggest that the Luerma monzodiorite is a quasi-aluminous and alkaline-shoshonite series. The rocks are enriched in light rare earth elements (LREE) and large ion lithofile elements (LILE), and depleted in heavy rare earth elements (HREE) and high field strength elements(HFSE), with LREE/HREE ratios of 7.45 to 11.10. They have weakly negative Eu anomalies of 0.83 to 0.95 without obvious Ce anomalies (δCe=0.93-1.04). The relatively low initial ⁸⁷Sr/⁸⁶Sr ratios of 0.705 532 to 0.706 135, positive ε_Hf(t) values of 4.97 to 14.10, and two-stage Hf model ages (T_DM2) ranging from 348 Ma to 930 Ma, indicate that the rocks derived from a juvenile crust. The monzodiorite's (¹⁴³Nd/¹⁴⁴Nd)_t values range from 0.512 639 to 0.512 669, their ε_Hf(t) values range from 0.08 to 0.67, their (²⁰⁶Pb/²⁰⁴Pb)_t values range from 18.235 to 18.521, their (²⁰⁷Pb/²⁰⁴Pb)_t values range from 15.593 to 15.651, and their (²⁰⁸Pb/²⁰⁴Pb)_t values range from 39.948 to 38.579. These data indicate that the Luerma monzodiorite was formed by partial melting of the juvenile crust. We propose that the Luerma monzodiorite was formed during the northward subduction of Yarlu Zangbo oceanic crust of the Neo Tethys Ocean.
- Lhasa terrane,
- Dajia Co,
- zircon U-Pb chronology,
- Sr-Nd-Pb-Hf isotopes,
- petrogenesis,
- geochemistry

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References(56)

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