冈底斯带甲玛矿区花岗斑岩类年代学、地球化学及岩石成因

孟元库; 马士委; 许志琴; 陈希节; 马绪宣

doi:10.3799/dqkx.2018.713

Volume 43 Issue 4

Apr. 2018

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Meng Yuanku, Ma Shiwei, Xu Zhiqin, Chen Xijie, Ma Xuxuan, 2018. Geochronology, Geochemistry and Petrogenesis of the Granitoid Porphyries from Jiama Ore Deposit in Gangdese Belt. Earth Science, 43(4): 1142-1163. doi: 10.3799/dqkx.2018.713

Citation:

Meng Yuanku, Ma Shiwei, Xu Zhiqin, Chen Xijie, Ma Xuxuan, 2018. Geochronology, Geochemistry and Petrogenesis of the Granitoid Porphyries from Jiama Ore Deposit in Gangdese Belt. Earth Science, 43(4): 1142-1163. doi: 10.3799/dqkx.2018.713

Citation:

Meng Yuanku, Ma Shiwei, Xu Zhiqin, Chen Xijie, Ma Xuxuan, 2018. Geochronology, Geochemistry and Petrogenesis of the Granitoid Porphyries from Jiama Ore Deposit in Gangdese Belt. Earth Science, 43(4): 1142-1163. doi: 10.3799/dqkx.2018.713

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Geochronology, Geochemistry and Petrogenesis of the Granitoid Porphyries from Jiama Ore Deposit in Gangdese Belt

doi: 10.3799/dqkx.2018.713

Meng Yuanku^{1,2,3
,},
Ma Shiwei³,
Xu Zhiqin^3,4,
Chen Xijie³,
Ma Xuxuan³

1.
College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
3.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
4.
School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, China

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

Abstract

Abstract

The petrogenesis of Miocene porphyries is still under debate, involving four different genetic models, such as, partial melting of residual oceanic crust, partial melting of thickened lower crust, partial melting of sub-continental lithospheric mantle and partial melting of metasomatized mafic lower crust related to subducted fluids. In order to clarify the petrogenesis and tectonic setting, petrological analyses and zircon LA-ICP-MS U-Pb dating in this study were carried out. In addition, whole-rock major and trace elements were analyzed by means of XRF and ICP-MS methods. The results demonstrate that the porphyries formed at 16.7-14.4 Ma, showing adakitic geochemical features. Geochemical characteristics, trace elemental ratios and discrimination diagrams suggest that magma source of the granitoid porphyries was derived from partial melting of the lower juvenile crustal material, whereas magma source of gabbro diorite porphyrite was sourced from the enriched lithospheric mantle. Together with published data, it is proposed that the Qinghai-Tibetan plateau was in the tectonic transformation from compression to extension or strike-slip during 18-13 Ma in the early stage of Miocene. The ore-bearing porphyries ascended through vertical fractures or faults and mingled with mid-upper crustal material generating granite porphyry, monzonitic granite porphyry, granodiorite porphyry and quartz diorite porphyrite. On the contrary, the coeval magma derived from the lithosphere mantle formed gabbro diorite porphyrite. Ore-bearing hydrothermal fluid was driven by tectonic stress and heat flow from magma took place at the sandstone slate and hornfel of the Linbuzong Formation, and marble and limestone of the Duodigou Formation characterized by inter-bedded tectonic fracture belts and collapse locations of folds, forming skarn-type copper polymetallic ore deposits.
- adakitic,
- porphyry pluton,
- Miocene,
- Jiama,
- Gangdese belt,
- petrology

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References(123)

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