Late Cretaceous Adakite in Sinongduo Area, Tibet: Implications for Petrogenesis and Mineralization

被引：0
|
作者：
Yang X. [1 ]
Tang J. [2 ]
Yang Z. [3 ]
Xie F. [4 ]
Hao J. [4 ]
Wu X. [4 ]
Song Z. [4 ]
机构：
[1] School of Earth Sciences and Resources, China University of Geosciences, Beijing
[2] MNR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Science, Beijing
[3] Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu
[4] College of Earth Science, Chengdu University of Technology, Chengdu
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 05期
关键词：
Adakite; Cu mineralization; Gangdese belt; Late Cretaceous; Mineral deposit; Sinongduo;
D O I：
10.3799/dqkx.2020.157
中图分类号：
学科分类号：
摘要：
The genesis of the Late Cretaceous adakite in the Gangdese belt, Tibet, has been debated for decades, and research on the productivity of these intrusions is limited. To provide a further understanding of this issue, it presents zircon U-Pb data, geochemical and zircon trace element data of the biotite monzogranite from Sinongduo-Jiaduobu area, Xietongmen County, Tibet. New age data indicate that the biotite monzogranite emplaced in the Late Cretaceous (83.1±1.6 Ma). These rocks are characterized by relatively high contents of SiO2 (60.21%-62.54%), MgO (2.19%-3.02%), Mg# (41.25-50.73), low contents of Y (15.9×10-6-17.8×10-6), Yb (1.46×10-6-1.73×10-6) and high Sr/Y (35.0-47.6), La/Yb (29.6-38.6) ratios, showing high-SiO2 adakitic rock affinity. These rocks belong to high-K calc-alkaline and metaluminous series (A/CNK=0.84-0.92), and enriched in LREE, LILE (large ion lithophile element) and depleted in HREE, HFSE (high field strength element), such as Nb and Ta. The zircon trace element data show high V/Sc, Ce/Ce*, 10 000×(Eu/Eu*), and moderate Eu/Eu* ratios. By comparing with typical adakitic rocks from the Gangdese belt, it is proposed that these rocks with high oxygen fugacity were derived from the partial melting of subducted Neo-Tethyan slab, and have good potential for Cu-Au mineralization. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：1597 / 1612
页数：15
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