新疆阿吾拉勒地区查岗诺尔铁矿床铜矿化的成因探讨*

南京大学学报(自然科学版) ›› 2012, Vol. 48 ›› Issue (3): 256–265.

新疆阿吾拉勒地区查岗诺尔铁矿床铜矿化的成因探讨*

牛贺才^1**，罗勇²，李宁波^1.3，姜玉航^1.3，杨武斌^1.3，单强¹，于学元¹

出版日期:2015-06-17 发布日期:2015-06-17
作者简介: (1.中国科学院广州地球化学研究所，广州，510640;2.南阳师范学院环境科学与旅游学院，
南阳，473061;3.中国科学院研究生院，北京,100049)
基金资助:
国家自然科学基金(41040029,41173040)

Study on the Cu-mineralization of the Chagangnuoer Fe-deposit
in the Awulale area，Xinjiang

Niu He-Cai¹，Luo Yong²,Li Ning Bo^1’3，Jiang Yu Hang^1’3 ,Yang Wu Bin ^1,3
Shun Qiang¹,Yu Xue-Yuan ¹

Online:2015-06-17 Published:2015-06-17
About author: (1 .Guangzhou lnsititutc of Geochemistry, Chinese Academy of Science, Guangzhou，510640，China;
2. School of Environmental Science and Tourism,Nanyang Normal University, Nanyang, 473061，China;
3. Graduate School of Chinese Academy of Science, Beijing, 100049，China)

摘要/Abstract

摘要： 与西天门!阿昔拉勒石炭纪火门!活动有关的铁矿床普遍发育含铜的方解石脉，在局部地段构成伴生或独立铜矿体.钻孔揭露显示，查岗诺尔铁矿体内含铜方解石脉穿插在磁铁矿、石榴石、阳起石和绿帘石中，其形成明显晚于铁矿化.流体包裹体研究显示，查岗诺尔铁矿床后期铜矿化的成矿流体应为CO₂ -CaCl₂- NaCl一H₂O体系的超临界流体.这种富含CO₂的超临界流体不但具有较强的渗透性，而且对铜等成矿元素具有较高的溶解度，可以携带巨量成矿元素进行长距离迁移.由于体系的温度及CO₂和H₂S等挥发分含量降低，铜等成矿元素在流体中的溶解度明显下降并沉淀成矿.碳、氧位素分析结果显示，查岗尔铁矿床晚期铜矿化与区内早二叠世的钾质一超钾质岩浆活动有关.

Abstract: The Cu-bearing calcite veins, usually in association with the accessory or independent Cu mineralization, were widespread in Fe-deposits associated with Carbonaceous volcanics in the Awulale Mountains, western Tianshan.The drillings show that the calcite veins occurred significantly later than the Fe-mineralization, with cutting across the magnetite, garnet，actinolitc and cpidotc.This study investigated the fluid inclusions forming after the Fe-mineralization in the Chagangnuocr deposit. The results suggest that the Cu-mineralization fluid was a supercritical fluid of CO₂一CaCl₂一NaCI一H₂O，Such CO₂一rich fluid was of high permeability and solubility in Cu,and of high ability to transfer abundant ore-forming elements over along distance. As the temperature down to
280?C一240?C，the fluid would change into sault solution.The solubility would drop and the orrforming elements would precipitate, since the decrease of temperature and violates of CO₂ and H₂S. C一Oisotopes indicate that the Cu-mineralization related fluids of the Chagangnuoer Fe deposit wrere
derived from the Permian potassic and shoshonitic magmatisims.

牛贺才^1**，罗勇²，李宁波^1.3，姜玉航^1.3，杨武斌^1.3，单强¹，于学元¹
. 新疆阿吾拉勒地区查岗诺尔铁矿床铜矿化的成因探讨*
[J]. 南京大学学报(自然科学版), 2012, 48(3): 256–265.

Niu He-Cai¹，Luo Yong²,Li Ning Bo^1’3，Jiang Yu Hang^1’3 ,Yang Wu Bin ^1,3
Shun Qiang¹,Yu Xue-Yuan ¹
. Study on the Cu-mineralization of the Chagangnuoer Fe-deposit
in the Awulale area，Xinjiang
[J]. Journal of Nanjing University(Natural Sciences), 2012, 48(3): 256–265.

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