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Genesis and Cu-Ni Metallogenetic Potential of Hongshigang Mafic-ultramafic Intrusion in East Tianshan, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第02期
Page:
156-169
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Genesis and Cu-Ni Metallogenetic Potential of Hongshigang Mafic-ultramafic Intrusion in East Tianshan, China
Author(s):
SHI Zhen1;  CHEN Hong-jun2;  QIAN Zhuang-zhi1*;  XU Gang1;  FENG Yan-qing1;  DUAN Jun1;  REN Meng3
(1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China; 2. South China Sea Bio-resource Exploitation and Utilization Collaborative Innovation Center, Sun Yat-sen University, Guangzhou 510006, Guangdong, China; 3. Institute of Earth Environment, Chinese Academy of Sciences, Xi’an 710061, Shaanxi, China)
Keywords:
zircon U-Pb dating;  mineral crystallochemistry;  petrogeochemistry;  mafic-ultramafic intrusion;  Cu-Ni sulfide;  metallogenetic potential;  East Tianshan
PACS:
P595; P612
DOI:
-
Abstract:
The Hongshigang mafic-ultramafic intrusion, a newly discovered Permian Cu-Ni sulfide-bearing intrusion, is located in the eastern margin of East Tianshan Cu-Ni metallogenic belt, the northern Xinjiang, China. The intrusion is consist of peridotite phase, gabbro phase and diorite phase. The Cu-Ni sulfide is mainly hosted in gabbro phase and peridotite phase. Zircons separated from gabbro yield a concordia age of(280±1)Ma, similar to the ages of other magmatic Cu-Ni sulfide-bearing mafic-ultramafic intrusions in East Tianshan Cu-Ni metallogenic belt. The Fo and Ni contents of olivine crystals from the sulfide-barren samples vary from 82.2 to 87.3 and from 1 240×10-6 to 3 470×10-6 respectively, exhibiting a positive Fo-Ni correlation that is consistent with the fractional crystallization of olivine plus removal of small amounts of immiscible sulfide liquid. The Hongshigang intrusive rocks are characterized by light REE enrichment and negative Nb-Ta anomalies. The Nb/Yb-Th/Yb diagram indicates that the parental magmas for Hongshigang intrusion experiences 10%-20% crustal contamination, which should play a major role in triggering sulfide saturation in Hongshigang magma. In addition, the similarities in formation age, parental magma characteristic and sulfide saturation mechanism between Hongshishan intrusion and other known magmatic Cu-Ni sulfide ore deposits in East Tianshan Cu-Ni metallogenic belt, indicate that Hongshigang intrusion has potential to host a sulfide deposit.

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Last Update: 2019-02-28