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

卷:

第41卷

期数:

2019年第02期

页码:

156-169

栏目:

基础地质与矿产地质

出版日期:

2019-03-15

文章信息/Info

Title:

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

文章编号:

1672-6561(2019)02-0156-14

作者:

师震¹; 陈宏骏²; 钱壮志^1*; 徐刚¹; 冯延清¹; 段俊¹; 任萌³

(1.长安大学 地球科学与资源学院,陕西 西安 710054; 2.中山大学 南海资源开发与保护协同创新中心,广东 广州 510006; 3.中国科学院地球环境研究所,陕西 西安 710061)

Author(s):

SHI Zhen¹;  CHEN Hong-jun²;  QIAN Zhuang-zhi^1*;  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)

关键词:

锆石U-Pb定年;  矿物晶体化学;  岩石地球化学;  镁铁—超镁铁质岩体;  铜镍硫化物;  成矿潜力;  东天山

Keywords:

zircon U-Pb dating;  mineral crystallochemistry;  petrogeochemistry;  mafic-ultramafic intrusion;  Cu-Ni sulfide;  metallogenetic potential;  East Tianshan

分类号:

P595; P612

DOI:

-

文献标志码:

A

摘要:

红石岗岩体是新疆东天山铜镍成矿带东段近年来新发现的含铜镍矿化的镁铁—超镁铁质岩体。红石岗岩体由橄榄岩相、辉长岩相和闪长岩相组成,铜镍硫化物主要赋存于辉长岩相和橄榄岩相中。辉长岩中锆石U-Pb定年表明红石岗镁铁—超镁铁质岩体的形成年龄为(280±1)Ma,与东天山其他主要含铜镍矿岩体形成年龄一致。红石岗岩体中橄榄石Fo牌号为82.2～87.3,Ni含量为(1 240～3 470)×10^-6,橄榄石Fo牌号与Ni含量的关系表明岩浆在橄榄石结晶过程存在硫化物熔离,但是模拟计算表明仅橄榄石分离结晶不能使岩浆中硫化物达到饱和。红石岗岩体全岩微量元素特征为轻稀土元素富集,具明显的Nb、Ta负异常,Nb/Yb-Th/Yb图解表明其母岩浆侵位过程中曾经历了10%～20%的地壳物质混染,这可能促使母岩浆中发生硫化物熔离。红石岗镁铁—超镁铁质岩体具有与东天山铜镍成矿带内其他含矿岩体相似的成岩成矿时代、母岩浆特征及硫化物饱和机制,表明红石岗岩体具有形成铜镍硫化物矿床的潜力。

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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备注/Memo

备注/Memo:

收稿日期:2018-11-10; 修回日期:2018-12-19 投稿网址:http://jese.chd.edu.cn/
基金项目:国家自然科学基金项目(41872076); 中央高校基本科研业务费专项资金项目(CHD300102279203)
作者简介:师 震(1994-),男,陕西榆林人,理学硕士研究生,E-mail:2016127036@chd.edu.cn。
 *通讯作者:钱壮志(1959-),男,陕西富平人,教授,博士研究生导师,理学博士,E-mail:zyxyqzz8@chd.edu.cn。

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更新日期/Last Update: 2019-02-28