| 山阳-柞水矿集区李家砭Ti-Fe矿床成矿构造背景研究 |
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| 引用本文： | 郭现轻,闫臻,王宗起,付长垒,陈雷.山阳-柞水矿集区李家砭Ti-Fe矿床成矿构造背景研究[J].岩石学报,2014,30(2):437-450. |
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| 作者姓名： | 郭现轻 闫臻 王宗起 付长垒 陈雷 |
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| 作者单位： | 中国地质科学院矿产资源研究所, 北京 100037;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 北京 100037;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 北京 100037;中国地质科学院矿产资源研究所, 北京 100037;中国地质科学院地质研究所, 大陆构造与动力学国家重点实验室, 北京 100037;中国地质科学院矿产资源研究所, 北京 100037 |
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| 基金项目： | 本文受“十二五”国家科技支撑计划课题（2011BAB04B05）和国家自然科学基金项目（41172178）联合资助. |
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| 摘 要： | 李家砭Ti-Fe矿床位于南秦岭山阳-柞水矿集区内南侧山阳-凤镇构造混杂带内,主要表现为钛磁铁矿和钛铁矿化,含矿围岩为堆晶辉长岩。矿物组合特征及结构分析表明,该矿床为典型的岩浆分异型矿床。矿物成分和岩石地球化学分析结果共同表明李家砭杂岩体具有岛弧钙碱性和大洋板内玄武岩双重岩浆性质。辉长岩SHRIMP锆石U-Pb测年结果表明,李家砭辉长岩和Ti-Fe矿床形成于621±6Ma,其中所含有的继承性锆石来自新元古代晚期岛弧中酸性岩浆岩,以上特征表明李家砭Ti-Fe矿床形成于新元古代晚期弧后盆地构造背景下。
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| 关 键 词： | 新元古代 Ti-Fe矿床 岩浆分异型矿床 弧后盆地 山阳-柞水矿集区 南秦岭 |
| 收稿时间： | 5/1/2013 12:00:00 AM |
| 修稿时间： | 2013/8/15 0:00:00 |
Tectonic setting of Lijiabian Ti-Fe deposit in Shanyang-Zhashui ore concentration area, Qinling Orogen. |
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| GUO XianQing,YAN Zhen,WANG ZongQi,FU ChangLei and CHEN Lei.Tectonic setting of Lijiabian Ti-Fe deposit in Shanyang-Zhashui ore concentration area, Qinling Orogen.[J].Acta Petrologica Sinica,2014,30(2):437-450. |
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| Authors: | GUO XianQing YAN Zhen WANG ZongQi FU ChangLei and CHEN Lei |
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| Institution: | Institute of Mineral and Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Mineral and Resources, Chinese Academy of Geological Sciences, Beijing 100037, China;State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;Institute of Mineral and Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
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| Abstract: | Lijiabian Ti-Fe deposit is located in Shanyang-Fengzhen tectonic mélange belt along the southern margin of Shanyang-Zhashui ore concentration area, South Qinling orogen. Ti-Fe mineralization is characterized by titanomagnetite and ilmenite, disseminated in cumulate gabbro. Mineral association and texture coevally indicate that Lijiabian Ti-Fe deposit is a typical magma differentiated deposit. The mineral and whole-rock geochemical data suggest that the host rocks of Lijiabian Ti-Fe deposit have a dual magmatic character of island arc calc-alkaline and ocean within-plate basalts. SHRIMP zircon U-Pb data of gabbro yield a weighted mean 206Pb/238U age of 621±6Ma. Inherited zircons demonstrate gabbro magma captured old mid-acid volcanic arc rock in Late-Neoproterozoic. These features demonstrate that the Lijiabian Ti-Fe deposit formed in a back-arc basin setting. |
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| Keywords: | Neoproterozoic Ti-Fe deposit Magma differentiated deposit Back-arc basin Shanyang-Zhashui ore concentration area South Qinling orogen |
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