粤北书楼丘矿床绿泥石成分特征及其指示意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

粤北书楼丘矿床绿泥石成分特征及其指示意义

Composition characteristics and indicative significance of chlorites in the Shulouqiu deposit, northern Guangdong

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DOI	10.20086/j.cnki.yskw.2024.0516
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2024, 43(5)
作者	孙国权，范洪海*，高永宝，庞雅庆，高飞，薛春纪，范堡程,
作者单位	1. 中国地质调查局西安矿产资源调查中心, 陕西西安 710100; 2. 核工业北京地质研究院铀资源勘查与评价技术重点实验室, 北京 100029; 3. 中国地质大学地球科学与资源学院, 北京 100083
摘要	绿泥石化是诸广南部长江岩体内书楼丘矿床中典型的成矿早期中低温热液蚀变类型。本文利用光学显微镜、电子探针和扫描电镜等手段对矿体外围水平蚀变带内绿泥石进行了综合研究,根据绿泥石的岩相学特征和成因等,将其划分为裂隙充填型绿泥石、黑云母蚀变型绿泥石、长石蚀变型绿泥石、白云母蚀变型绿泥石和球粒状绿泥石5种类型。这5种绿泥石结构类型相同,均为三八面体富铁型绿泥石,分别属于蠕绿泥石、铁镁绿泥石、鲕绿泥石3个种属。5种类型的绿泥石可能形成于成矿早期同一期流体作用之中,形成温度在219～282℃之间,成矿系统的log f_O₂值为-47.74～-43.69。综合区域上前人研究成果,认为成矿早期流体是以幔源物质为主的壳幔混合流体,其形成与区域上基性岩脉的侵入作用有关,同时,成矿早期流体具有强还原性,为成矿系统提供了还原性化学障,致使主成矿期流体中携带的U⁶⁺被还原沉淀成矿。
Abstract	Chloritization is a typical middle-low temperature hydrothermal alteration type of early ore-forming stage in Shulouqiu deposit of Changjiang rock mass in southern Zhuguang. In this paper, the chlorite in the horizontal alteration zone around the ore body are studied comprehensively by optical microscopy, electron probe and scanning electron microscopy. Based on the lithological characteristics and genesis of chlorite, they are divided into five types: fissure filling chlorite, biotite altered chlorite, feldspar altered chlorite, dolomite altered chlorite and spherical chlorite. The five types of chlorite are all trioctahedral iron-rich chlorite with the same structure type, belonging to three species: vermicular chlorite, ferromagnesian chlorite and uraninite chlorite. Then, the five types of chlorite may have formed in the same period of fluid action in the early ore-forming period, with the formation temperature between 219~282℃ and log f_O₂ between -47.74~-43.69. Combined with previous research results in the region, the early ore-forming fluid may be a crust-mantle mixed fluid dominated by mantle-derived materials, with strong reducibility. Its formation is related to the intrusion of regional basic veins, which provides a reducing field for the mineralization system, resulting in the reduction and precipitation of U⁶⁺ in the ore-forming fluid.
关键词	绿泥石；地质特征；地质温度计；氧逸度；书楼丘矿床
KeyWord	chlorite; geological feature; geological thermometer; oxygen fugacity; Shulouqiu deposit
基金项目
页码	1313-1327

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引用本文

孙国权，范洪海*，高永宝，庞雅庆，高飞，薛春纪，范堡程. 粤北书楼丘矿床绿泥石成分特征及其指示意义 [J]. 岩石矿物学杂志. 2024; 43; (5). 1313 - 1327.

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