中拉萨地块晚白垩世曲桑格勒花岗岩的成因: 地球化学、锆石U-Pb年代学及Sr-Nd-Pb-Hf同位素的约束

王欣欣; 闫国强; 刘洪; 黄瀚霄; 赖杨; 田恩源; 欧阳渊

doi:10.3799/dqkx.2020.278

Volume 46 Issue 8

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Wang Xinxin, Yan Guoqiang, Liu Hong, Huang Hanxiao, Lai Yang, Tian Enyuan, Ouyang Yuan, 2021. Genesis of Late Cretaceous Qusang'gele Granitie in Central Lhasa Block, Tibet: Constraints by Geochemistry, Zircon U-Pb Geochronology, and Sr-Nd-Pb-Hf Isotopes. Earth Science, 46(8): 2832-2849. doi: 10.3799/dqkx.2020.278

Citation:

Wang Xinxin, Yan Guoqiang, Liu Hong, Huang Hanxiao, Lai Yang, Tian Enyuan, Ouyang Yuan, 2021. Genesis of Late Cretaceous Qusang'gele Granitie in Central Lhasa Block, Tibet: Constraints by Geochemistry, Zircon U-Pb Geochronology, and Sr-Nd-Pb-Hf Isotopes. Earth Science, 46(8): 2832-2849. doi: 10.3799/dqkx.2020.278

Citation:

Wang Xinxin, Yan Guoqiang, Liu Hong, Huang Hanxiao, Lai Yang, Tian Enyuan, Ouyang Yuan, 2021. Genesis of Late Cretaceous Qusang'gele Granitie in Central Lhasa Block, Tibet: Constraints by Geochemistry, Zircon U-Pb Geochronology, and Sr-Nd-Pb-Hf Isotopes. Earth Science, 46(8): 2832-2849. doi: 10.3799/dqkx.2020.278

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Genesis of Late Cretaceous Qusang'gele Granitie in Central Lhasa Block, Tibet: Constraints by Geochemistry, Zircon U-Pb Geochronology, and Sr-Nd-Pb-Hf Isotopes

doi: 10.3799/dqkx.2020.278

Wang Xinxin^{1
,
,},
Yan Guoqiang^{2, 3
,
,},
Liu Hong⁴,
Huang Hanxiao⁴,
Lai Yang⁵,
Tian Enyuan⁵,
Ouyang Yuan⁴

1.
Institute of Coal Engineering, Datong University, Datong 037003, China
2.
Tianjin Center of China Geological Survey, Tianjin 300170, China
3.
Key Laboratory of Uranium Geology of China Geological Survey, Tianjin 300170, China
4.
Chengdu Center of China Geological Survey, Chengdu 610081, China
5.
Institute of Multipurpose Utilization of Mineral Resources, Chengdu 610061, China

Received Date: 2020-04-12
Available Online: 2021-09-14
Publish Date: 2021-08-15

Abstract

Abstract

There are still many controversies about the tectonic evolution time and subduction direction of the Bangong Co-Nujiang suture zone. Many Early Cretaceous magmatic rocks lie in the north margin of the central Lhasa Block, it is helpful to understand the setting of magma activity and tectonic dynamics by researching the genesis and formation mechanism of the magma in the Cretaceous period of the Lhasa Block. Based on detailed field investigation upon the Qusang'gele granite, a comprehensive research of their petrography, geochemistry, zircon U-Pb geochronology and Sr-Nd-Pb-Hf isotope was carried out. Qusang'gele granite has high contents of SiO₂ (75.23%-77.66%), total (K₂O+Na₂O) (8.41%-8.94%), lower contents of A1₂O₃ (11.96%-12.38%) and CaO (0.18%-0.55%), with Reitman index of 2.05-2.33, and A/CNK values of 0.99 to 1.03; it is enriched in LILE such as Rb, Th, U, K, Pb, and depleted in HFSE such as Nb, Ta, P, Ti; all samples are enriched in LREE and depleted in HREE, the LREE/HREE ratios is 2.42 to 5.00, with typical seagull-shaped distribution pattern, strong negative Eu anomalies of 0.048 to 0.075, without obvious negative Ce anomalies (δCe=0.739-1.471).Caculated zircon saturated temperatures of Qusang'gele granite range from 763.50 to 850.65℃, averaged at 795.2℃.Combined with the geochemical characteristics above, the Qusang'gele granite should be defined as A-type granite. The syenogranite has a weighted mean ²⁰⁶Pb/²³⁸U age of 101±1 Ma (MSWD=0.45) by LA-ICP-MS zircon U-Pb analysis, suggesting that the Qusang'gele magmatism took place during the Early Late Cretaceous. It has positive ε_Hf(t) values of 4.44 to 5.85 and Hf model T_DM1 ages of 536-592 Ma and T_DM2 ages of 702-781 Ma; Qusang'gele granite is characterized with the (⁸⁷Sr/⁸⁶Sr)_t values of 0.706 2 to 0.710 6, (¹⁴³Nd/¹⁴⁴Nd)_t values of 0.512 315 to 0.512 441, and ε_Nd(t) values of -6.27 to -3.82; (²⁰⁶Pb/²⁰⁴Pb)_t values of 18.653 to 18.794, (²⁰⁷Pb/²⁰⁴Pb)_t values of 15.709 to 15.731, and (²⁰⁸Pb/²⁰⁴Pb)_t values of 38.960 to 39.100. It is showed that the partial melting of metamorphic mud in the upper crust during the post-collision stage between the Lhasa Block and the Qiangtang Block in the discrimination diagrams of tectonic setting. Therefore, the Qusang'gele granite occurred in post-collision extension stage when the deep Precambrian metamorphic basement underwent partially deep-melting due to the effect of thinning and decompression, which resulted in the A-type granite originated from the middle-upper crust of the thickened Lhasa Block.
- Tibet,
- Bangong Co-Nujiang suture zone,
- central Lhasa Block,
- Qusang'gele,
- A-type granite,
- geochemistry,
- geochronology

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References(107)

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Genesis of Late Cretaceous Qusang'gele Granitie in Central Lhasa Block, Tibet: Constraints by Geochemistry, Zircon U-Pb Geochronology, and Sr-Nd-Pb-Hf Isotopes

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