| 幕阜山地区断峰山铌钽矿的矿物学、年代学和赋存状态 |
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| 引用本文： | 祝明明,邹建林,王闯,冯超,付宏林,赵鹏,陈阳,徐海军.幕阜山地区断峰山铌钽矿的矿物学、年代学和赋存状态[J].地质科技通报,2021,40(6):55-69. |
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| 作者姓名： | 祝明明 邹建林 王闯 冯超 付宏林 赵鹏 陈阳 徐海军 |
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| 基金项目： | 湖北省自然资源厅科研计划项目ZRZY2019KY05国家自然科学基金项目41772222 |
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| 摘 要： | 幕阜山复式花岗岩体位于湖北、湖南和江西三省交界处，在岩体北缘的断峰山和南缘的仁里地区相继发现两个大型铌钽矿床。围绕断峰山铌钽矿床，在野外调查基础上开展矿物学和年代学测试分析，旨在揭示铌钽矿赋存状态、成矿时代和成矿特征，为理解幕阜山地区铌钽矿的矿床成因和指导找矿工作提供基础地质约束资料。断峰山铌钽矿床位于幕阜山复式花岗岩体北缘与冷家溪群接触带的伟晶岩密集区，属于典型花岗伟晶岩型铌钽矿床。铌钽矿主要产出于白云母钠长石伟晶岩中，多以半自形-自形铌锰矿矿物赋存，常见伴生矿物有钠长石、白云母和石英。铌钽矿LA-ICP-MS U-Pb测年数据为136.6~136.2 Ma，反映铌钽矿结晶和成矿年龄。断峰山铌钽矿的形成与幕阜山复式花岗岩体多期次多阶段演化分异作用密切相关，成矿元素可能受到岩浆演化后期熔流体活动和围岩黑云母片岩共同控制。
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| 关 键 词： | LA-ICP-MS U-Pb测年 断峰山铌钽矿 幕阜山 |
| 收稿时间： | 2021-01-12 |
Mineralogy,geochronology and occurrence state of the Duanfengshan Nb-Ta deposit in Mufushan area |
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| Abstract: | The two large niobium-tantalum deposits, Duanfengshan in the north margin and Renli in the south margin, were reported in the Mufushan area located in the junction of Hubei, Hunan and Jiangxi provinces.In this paper, we present field geological survey, mineralogical and geochronological investigations on the Duanfengshan Nb-Ta deposit, which are important to reveal the metallogenic characteristic, ore genesis and prospecting direction of the Nb-Ta deposit in the Mufushan area.The Duanfengshan Nb-Ta deposit is a typical granitic pegmatite type Nb-Ta deposit.It is mainly located in the densely distributed pegmatite area within the contact zone between the northern Mufushan composite granite and Lengjiaxi Group.The Nb and Ta elements are commonly enriched in the muscovite-ablite pegmatite, and are mainly hosted in the independent manganocolumbite minerals which commonly associated with albite, muscovite and quartz.Laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb dating of columbotantalite from the Nb-Ta pegmatite yielded concordant ages of 136.6-136.2 Ma, which denotes the Nb-Ta mineralization age.The data indicate that the ore forming elements of Nb and Ta are probably enriched from the evolution and differentiation of Mufushan granite magma, while the crystal nucleation and growth of Nb and Ta bearing minerals are influenced and controlled by many factors especially the fluid melt of late stage magma as well as the host country rock of biotite gneiss. |
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