| 辽宁排山楼金矿床黑云母花岗岩成岩时代及地质意义 |
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| 引用本文： | 聂世嘉,杨言辰,韩世炯,张琳,王凤博.辽宁排山楼金矿床黑云母花岗岩成岩时代及地质意义[J].延边大学理工学报,2017,0(2):161-174. |
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| 作者姓名： | 聂世嘉 杨言辰 韩世炯 张琳 王凤博 |
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| 作者单位： | 吉林大学 地球科学学院，吉林 长春 130061 |
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| 摘 要： | 排山楼金矿床是华北克拉通北缘东段赤峰—朝阳—阜新金矿成矿带中的韧性剪切带型金矿，矿体主要赋存于EW向韧性剪切带的太古宙变质岩中。选择控矿韧性剪切带北部的黑云母花岗岩为研究对象，对其进行了全岩主量、微量元素地球化学特征分析及LA-ICP-MS锆石U-Pb定年研究，探讨其成因类型、形成时代和构造背景。地球化学特征表明，岩石属于I型高钾钙碱性、准铝质—弱过铝质花岗岩，富集轻稀土元素及大离子亲石元素，呈弱的负Eu异常，亏损高场强元素，具有活动大陆边缘岩浆岩的地球化学亲缘性。锆石U-Pb定年结果显示，黑云母花岗岩侵入时代为早白垩世燕山期（(121.8±1.1)Ma）。通过野外观察黑云母花岗岩与控矿韧性剪切带之间的接触关系，对比岩矿间微量元素、同位素特征，结合华北克拉通区域构造演化，认为排山楼金矿床形成于岩石圈伸展的构造背景之下，成矿时代为早白垩世晚期，是韧性剪切作用导致矿源层成矿元素发生活化、迁移、富集的产物。
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| 关 键 词： | 黑云母花岗岩 I型花岗岩 岩石地球化学 锆石U-Pb年龄 成矿时代 金矿 华北克拉通 |
Formation Age and Geological Significance of Biotite Granite in Paishanlou Au Deposit of Liaoning,China |
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| NIE Shi-jia,YANG Yan-chen,HAN Shi-jiong,ZHANG Lin,WANG Feng-bo.Formation Age and Geological Significance of Biotite Granite in Paishanlou Au Deposit of Liaoning,China[J].Journal of Yanbian University (Natural Science),2017,0(2):161-174. |
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| Authors: | NIE Shi-jia YANG Yan-chen HAN Shi-jiong ZHANG Lin WANG Feng-bo |
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| Affiliation: | College of Earth Sciences, Jilin University, Changchun 130061, Jilin, China |
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| Abstract: | Paishanlou Au deposit，which is located in Chifeng-Chaoyang-Fuxin gold metallogenic belt, the eastern segment of northern periphery of North China Craton, is ductile shear belt-hosted. The ore body is mainly hosted in Archean metamorphic rocks of EW-trending ductile shear belt. The biotite granite outcropped in the north of ore-controlling ductile shear belt was taken as the research object; the geochemical characteristics of whole-rock major and trace elements were analyzed; LA-ICP-MS zircon U-Pb age was measured; and the petrogenesis, formation age and tectonic setting were discussed. The biotite granite belongs to I-type granite with high-K calc-alkaline and quasi-aluminous-weak peraluminous, showing the characteristics of minor negative Eu anomaly, enrichment of light rare earth elements and large ion lithophile elements, and loss of high field strength elements; thus, the rocks have geochemical affinity of active continental margin magmatic rock. LA-ICP-MS zircon U-Pb age is (121.8±1.1)Ma, so that the biotite granite is emplaced during Early Cretaceous Yanshanian. Based on the observation of contact relationship between biotite granite and ore-controlling ductile shear belt, the relationship of trace element and isotope characteristics between biotite granite and gold ore was contrasted. Combined with the tectonic evolution in North China Carton, it is indicated that Paishanlou Au deposit is formed in Early Cretaceous by the background of the regional extensional tectonism and lithosphere thinning process, and the mineralogenetic epoch is late Early Cretaceous. In general, Paishanlou Au deposit is the product of the activation, migration and enrichment of source bed by ductile shearing. |
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| Keywords: | biotite granite I-type granite petrogeochemistry zircon U-Pb age ore-forming age Au deposit North China Craton |
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