| 新疆尾亚—天湖地区花岗岩类剥蚀程度估算及对区域找矿的启示 |
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| 引用本文： | 李季霖,陈正乐,周涛发,韩凤彬,张文高,霍海龙,刘博,赵同阳,韩琼,李平,郑加行,陈贵民. 新疆尾亚—天湖地区花岗岩类剥蚀程度估算及对区域找矿的启示[J]. 地学前缘, 2021, 28(3): 355-378. DOI: 10.13745/j.esf.sf.2021.1.9 |
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| 作者姓名： | 李季霖 陈正乐 周涛发 韩凤彬 张文高 霍海龙 刘博 赵同阳 韩琼 李平 郑加行 陈贵民 |
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| 作者单位： | 中国地质科学院地质力学研究所国土资源部古地磁与古构造重建重点实验室,北京100081;合肥工业大学资源与环境工程学院,安徽合肥230009;中国地质科学院地质力学研究所国土资源部古地磁与古构造重建重点实验室,北京100081;东华理工大学核资源与环境国家重点实验室,江西南昌330013;合肥工业大学资源与环境工程学院,安徽合肥230009;中国地质科学院地质力学研究所国土资源部古地磁与古构造重建重点实验室,北京100081;新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000;新疆维吾尔自治区地质矿产勘查开发局第六地质大队,新疆哈密839000 |
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| 基金项目： | 国家科技支撑计划项目(2018YFC0604005);中国地质调查局项目(DD20190161);国家自然科学基金项目(41902214);中国地质调查局基本科研业务费项目(JYYWF20183702);中国地质调查局基本科研业务费项目(JYYWF20180602) |
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| 摘 要： | 尾亚—天湖地区位于新疆中亚造山带东南部的中天山地块内,晚古生代—中生代岩浆活动强烈,产出了战略性关键矿产尾亚钒铁磁铁矿.在详细岩相学观察的基础上,对尾亚、天湖和沙泉子南岩体中的角闪石和黑云母进行了电子探针(EMPA)测试分析,限定了 3个岩体结晶的温压条件、氧逸度、含水量和含铁指数等要素,为解析中天山地块的岩浆-成矿物...
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| 关 键 词： | 矿物学特征 物理化学条件 角闪石-黑云母温压计 隆升-剥蚀程度 中天山地块尾亚—天湖地区 |
| 收稿时间： | 2021-01-20 |
Estimation of the extend of granitoid exhumation in the Weiya-Tianhu area: Insight into ore prospecting in the Central Tianshan region,Xinjiang |
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| LI Jilin,CHEN Zhengle,ZHOU Taofa,HAN Fengbin,ZHANG Wengao,HUO Hailong,LIU Bo,ZHAO Tongyang,HAN Qiong,LI Ping,ZHENG Jiaxing,CHEN Guimin. Estimation of the extend of granitoid exhumation in the Weiya-Tianhu area: Insight into ore prospecting in the Central Tianshan region,Xinjiang[J]. Earth Science Frontiers, 2021, 28(3): 355-378. DOI: 10.13745/j.esf.sf.2021.1.9 |
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| Authors: | LI Jilin CHEN Zhengle ZHOU Taofa HAN Fengbin ZHANG Wengao HUO Hailong LIU Bo ZHAO Tongyang HAN Qiong LI Ping ZHENG Jiaxing CHEN Guimin |
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| Abstract: | The Weiya-Tianhu granitoid area is located on the Central Tianshan Terrane, Xinjiang, southeast of the Central Asian Orogenic Belt (CAOB), where Late Paleozoic-Early Mesozoic magmatic activities were widespread and the strategic key mineral Weiya V-Ti magnetite is produced. This paper reports the detailed petrographic observations of the region. Based on these observations, the compositions of amphiboles and biotites from the Weiya, Tianhu, and Shaquanzinan granitoids were obtained by electron microprobe analysis (EMPA) to constrain the crystallization controlling factors for the three granitoids. The constrained controlling factors such as temperature, pressure, oxygen fugacity, water content and Fe provide references for analyzing the physicochemical conditions of magmatic mineralization and ore prospecting in the region. The EMPA data show that the amphiboles are rich in Mg, Ca and Na, poor in K, and belong to calcic amphiboles. The biotites have the characteristics of high Mg, Ti, Al and K contents and low Si and Na contents, which suggests a magnesia origin. The chemical compositions of amphiboles and biotites revealed their host magma to be the calc-alkaline orogenic rock series from a hybrid crustal-mantle source, attributed probably to partial melting of mantle wedge and continental crust under the tectonic setting of plate subduction. The crystallization temperature and pressure of the Shaquanzinan quartz diorite, Weiya monzonitic granites and moyites, and Tianhu granodiorites, calculated by geothermometric method, were 651-753 ℃ and 31-79 MPa, 762-833 ℃ and 85-215 MPa, 668-812 ℃ and 31-117 MPa, respectively. The magmatic oxygen fugacity lgf(O2) in the three granitoids at crystallization varied from -15.7 to -9.4, with high water content in the melt during amphibole crystallization. Therefore, it is suggested that the granitoids in the region have the characteristics of high temperature, low pressure, high oxygen fugacity, water-rich and high Fe index, which are beneficial to elemental enrichment in ore-forming fluid and hence favoring Fe mineralization. The intrusive depth of these granitoids was further assessed by Al-in-hornblende barometry. The results show that the extend of granitoid exhumation is between 2.2-5.5 kilometers in the region, where the rates of uplifting and exhumation differ significantly. Together with the known ore distribution on land surface, it is proposed that Fe prospectivity is highly favorable at depth in the Tianhu granodiorite area. |
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| Keywords: | mineralogical characteristics physicochemical conditions Al-in-hornblende barometry uplifting-exhumation extend Weiya-Tianhu area in the Central Tianshan Terrane |
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