广西佛子冲矿田龙湾铅锌矿床深边部找矿预测研究
发布时间：2019-02-14 16:20
【摘要】：龙湾矿床位于佛子冲矿田南部,佛子冲矿田坐落于桂东南岑溪市北东约50Km与苍梧县的交界处,是我国华南地区重要的大型铅锌多金属矿田之一。本论文通过研究矿床地质特征,控矿因素,并结合地、物、化信息特征,运用GIS的空间分析功能进行了综合信息成矿预测,并圈定了靶区。通过研究主要取得以下认识：(1)通过光薄片鉴定和野外的详细调查,广西佛子冲龙湾矿床矿体主要赋存于奥陶系中统上组上段(O2b-2)层位中,围岩蚀变具有典型的岩浆热液蚀变的特点。根据矿石组构特征,以及矿物之间的穿插关系的研究,矿石具以下组构特怔：结构(交代结构和结晶结构),构造(块状构造、脉状构造和浸染状构造),由于该矿区岩浆活动、构造运动十分强烈,使得矿化具有多期性,矿物之间的交代作用十分普遍,类型繁多,多期多阶段是该矿床成矿的重要特点。(2)根据矿床地质和地层、岩体含矿性并结合矿床成矿物质来源的研究可以认为：佛子冲矿田龙湾铅锌矿床的成矿时间与燕山晚期花岗斑岩形成同期(或稍晚),其成矿物质一部分来源于奥陶系中统上组上段(O2b-2)和上统上组上段(O3b-2),一部分来自于燕山晚期岩浆携带的含矿物质。矿床的形成有两期。第一期为成岩成矿期,形成了奥陶系中统上组上段(O2b-2)和上统上组上段(O3b-2)地层为初始矿源层。矿床内奥陶系中统上组上段(O2b-2)和上统上组上段(O3b-2)铅锌元素含量大大高于中国陆壳元素丰度值,为后期的成矿提供了丰富的物质来源和良好的背景。第二期为燕山晚期岩浆侵入的叠加改造期。对地球化学同位素方面的研究,S同位素具有陨石硫的特征,与岩浆活动密切相关,因此,可以认为佛子冲矿田龙湾铅锌矿床成因应该为早期奥陶系沉积(形成初始矿源层)+燕山晚期岩浆热液叠加改造。(3)通过对该矿区矿床地质特征和控矿条件分析,认为该矿床是由地层岩性(泥质灰岩、钙泥质粉砂岩)、NNE构造破碎带和花岗斑岩三位一体联合控制。(4)通过对该区的地、物、化多源地学信息特征进行了分析,总结并建立了广西龙湾矿床的综合信息找矿模型。通过对矿区运用GIS的空间分析功能进行了综合信息成矿预测,圈定了找矿靶区8个：3个Ⅰ级靶区、2个Ⅱ级靶区、3个Ⅲ级靶区。
[Abstract]:Longwan deposit is located in the south of Fuzichong Orefield, which is located at the junction of 50Km and Cangwu County in the north east of Cenxi City, southeast of Guangxi. It is one of the important large Pb-Zn polymetallic fields in South China. By studying the geological characteristics of ore deposits, ore-controlling factors, and combining the characteristics of ground, material and chemical information, the paper makes use of the spatial analysis function of GIS to carry out the comprehensive information metallogenic prediction and delineates the target area. The main results are as follows: (1) through the identification of light sheet and the detailed investigation in the field, the orebody of Longwan deposit in Fucinchong, Guangxi is mainly located in the upper member of Upper Ordovician formation (O2b-2). The wall rock alteration is characterized by typical magmatic hydrothermal alteration. According to the characteristics of ore fabric and the intercalation relationship between minerals, the ore is characterized by the following structures: structure (metasomatic structure and crystalline structure), structure (block structure, vein structure and disseminated structure), As a result of magmatic activity and strong tectonic movement in this mine, mineralization is of multi-period nature, and the metasomatism between minerals is very common, and there are many types of metasomatism. Multi-period and multi-stage are the important characteristics of mineralization of the deposit. (2) according to the geological and stratigraphic characteristics of the deposit, The ore-forming time of Longwan Pb-Zn deposit in Fuzichong Orefield and the late Yanshanian granitic porphyry formed at the same time (or later) can be considered. Some of the ore-forming materials are derived from the upper member of Upper Ordovician formation (O2b-2) and the Upper member of Upper Ordovician formation (O3b-2), and partly from the ore-bearing materials carried by magma in the late Yanshanian period. There are two stages in the formation of the deposit. The first stage is the diagenetic and metallogenic period, forming the upper member of Upper Ordovician Upper formation (O2b-2) and Upper member of Upper Ordovician formation (O3b-2), which is the initial source bed. The contents of lead and zinc elements in upper member (O2b-2) and upper member (O3b-2) of Ordovician are much higher than the abundance of continental crust elements in China, which provides abundant material source and good background for late mineralization. The second stage is the stage of superposition and transformation of late Yanshanian magma intrusion. In the study of geochemical isotopes, S isotopes have the characteristics of meteorite sulfur and are closely related to magmatic activity. It can be concluded that the origin of the Longwan Pb-Zn deposit in Faozichong Orefield should be superimposed by magmatic hydrothermal superposition in the late Yanshanian period of early Ordovician sedimentation (formation of initial source bed). (3) by analyzing the geological characteristics and ore-controlling conditions of the deposit, It is considered that the deposit is controlled jointly by stratigraphic lithology (argillaceous limestone, calcareous siltstone), NNE structural fracture zone and granitic porphyry). The comprehensive information prospecting model of Longwan deposit in Guangxi is summarized and established. By using the spatial analysis function of GIS, this paper makes a comprehensive information metallogenic prediction, and delineates 8 ore prospecting targets: 3 鈪，
本文编号：2422380
[Abstract]:Longwan deposit is located in the south of Fuzichong Orefield, which is located at the junction of 50Km and Cangwu County in the north east of Cenxi City, southeast of Guangxi. It is one of the important large Pb-Zn polymetallic fields in South China. By studying the geological characteristics of ore deposits, ore-controlling factors, and combining the characteristics of ground, material and chemical information, the paper makes use of the spatial analysis function of GIS to carry out the comprehensive information metallogenic prediction and delineates the target area. The main results are as follows: (1) through the identification of light sheet and the detailed investigation in the field, the orebody of Longwan deposit in Fucinchong, Guangxi is mainly located in the upper member of Upper Ordovician formation (O2b-2). The wall rock alteration is characterized by typical magmatic hydrothermal alteration. According to the characteristics of ore fabric and the intercalation relationship between minerals, the ore is characterized by the following structures: structure (metasomatic structure and crystalline structure), structure (block structure, vein structure and disseminated structure), As a result of magmatic activity and strong tectonic movement in this mine, mineralization is of multi-period nature, and the metasomatism between minerals is very common, and there are many types of metasomatism. Multi-period and multi-stage are the important characteristics of mineralization of the deposit. (2) according to the geological and stratigraphic characteristics of the deposit, The ore-forming time of Longwan Pb-Zn deposit in Fuzichong Orefield and the late Yanshanian granitic porphyry formed at the same time (or later) can be considered. Some of the ore-forming materials are derived from the upper member of Upper Ordovician formation (O2b-2) and the Upper member of Upper Ordovician formation (O3b-2), and partly from the ore-bearing materials carried by magma in the late Yanshanian period. There are two stages in the formation of the deposit. The first stage is the diagenetic and metallogenic period, forming the upper member of Upper Ordovician Upper formation (O2b-2) and Upper member of Upper Ordovician formation (O3b-2), which is the initial source bed. The contents of lead and zinc elements in upper member (O2b-2) and upper member (O3b-2) of Ordovician are much higher than the abundance of continental crust elements in China, which provides abundant material source and good background for late mineralization. The second stage is the stage of superposition and transformation of late Yanshanian magma intrusion. In the study of geochemical isotopes, S isotopes have the characteristics of meteorite sulfur and are closely related to magmatic activity. It can be concluded that the origin of the Longwan Pb-Zn deposit in Faozichong Orefield should be superimposed by magmatic hydrothermal superposition in the late Yanshanian period of early Ordovician sedimentation (formation of initial source bed). (3) by analyzing the geological characteristics and ore-controlling conditions of the deposit, It is considered that the deposit is controlled jointly by stratigraphic lithology (argillaceous limestone, calcareous siltstone), NNE structural fracture zone and granitic porphyry). The comprehensive information prospecting model of Longwan deposit in Guangxi is summarized and established. By using the spatial analysis function of GIS, this paper makes a comprehensive information metallogenic prediction, and delineates 8 ore prospecting targets: 3 鈪，
本文编号：2422380
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