| 阿尔金山东端余石山铌钽矿区霓辉正长岩的LA-ICP-MS定年及对成矿时代的制约 |
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| 引用本文： | 杨再朝,;校培喜,;高晓峰,;康磊,;谢从瑞,;余君鹏.阿尔金山东端余石山铌钽矿区霓辉正长岩的LA-ICP-MS定年及对成矿时代的制约[J].西北地质,2014(4):187-197. |
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| 作者姓名： | 杨再朝 ;校培喜 ;高晓峰 ;康磊 ;谢从瑞 ;余君鹏 |
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| 作者单位： | [1]中国地质大学(武汉)地质调查研究院,湖北武汉430074; [2]中国地质调查局西安地质调查中心,陕西西安710054; [3]甘肃省地质调查院,甘肃兰州730000 |
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| 基金项目： | 中国地质调查局国土资源大调查研究（1212011085034,12120113044500）国家自然科学基金（41202044） |
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| 摘 要： | 余石山铌钽矿床是近年来发现的一大型矿床,位于阿尔金造山带之红柳沟-拉配泉蛇绿构造混杂岩带、祁连造山带、欧龙布鲁克微陆块的结合部位。对矿区进行成矿背景研究时发现,矿区赋矿地层主要为长城系熬油沟组,岩性组合为变质火山岩及大理岩,穿插有霓辉正长岩体,其中发育细粒烧绿石与霓辉石等富铌钽矿物。并对霓辉正长岩进行锆石LA-ICP-MS年代学测定,结果表明霓辉石正长岩成岩年龄为(776.8±2.5)Ma,成矿与成岩年龄相近或稍晚,表明该霓辉正长岩和铌钽矿床可能形成于南华纪Rodinia超大陆裂解时所产生的大陆边缘裂谷构造环境。
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| 关 键 词： | 阿尔金东段 余石山铌钽矿床霓辉正长岩 LA-ICP-MS锆石U-Pb定年 |
LA-ICP-MS Dating of the Aegirine-Augite Syenite of Yushishan Nb-Ta Deposit in Eastern Altun and Its Constraints on the Metallogenetic Age |
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| Institution: | YANG Zai-chao , XIAO Pei-Xi , GAO Xiao-Feng , KANG Lei , XIE Cong-Rui , YU Jun-Peng (1. Geological Survey, China University of Geosciences , Wuhan 430074, China; 2. Xi ＇ an Center of Geological Survey, CGS, Xi＇ an 71005, China; 3. Gansu Geological Survey, Lanzhou 73000, China) |
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| Abstract: | Lying in the joint of Hongliugou-Lapeiquan ophiolitic melange zone （eastern part of the Ahun Mountains）, Qilian orogenic belt and Oulongbuluke microcontinent, Yushishan Nb-Ta De- posit is a large-size deposit recently discovered. Based on the study of its metallogenic back- ground, the major ore-bearing strata is found to be Ao＇ yougou Formation of Changchengian Pe- riod. The lithological association includes metamorphic volcanic rock and marble, mixed with aegirine-augite syenite, where develop minerals rich in Nb-Ta such as fine-grain pyrochlore and ae- girine-augite. The LA-ICP-MS dating for zircons from an aegirine-augite syenite sample yields the diagenetic age of 776.8±2.5 Ma, indicating that the metallogenic age is similar or slightly later than the mineralization of the rock. Combined with petrological-mineralogical characteristic under the microscope and metallogenic age, the aegirine-augite syenite and Nb-Ta deposit were probably formed in continental rift tectonic background induced by the breakup of Rodinia supercontinent in Nanhua Period. |
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| Keywords: | Eastern Altun aegirine-augite syenite of Yushishan Nb Tadeposit LA-ICP-MSzir-con U-Pb dating |
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