个旧锡矿——红海型热水沉积登陆的实例  

GEJIU TIN-POLYMETALLIC ORE DEPOSIT: AN EXAMPLE OF LANDING OF RED SEA-TYPE SUBMARINE HYDROTHERMAL DEPOSITION

作　　者：张欢[1] 童祥 武俊德 罗泰义[1] 陶琰[1] 朱丹[1] 

机构地区：[1]中国科学院地球化学研究所矿床地球化学国家重点实验室,贵州贵阳550002 [2]云南锡业集团有限责任公司,云南个旧661000

出　　处：《矿物学报》2007年第3期335-341,共7页Acta Mineralogica Sinica

基　　金：国家自然科学基金(批准号:4060301340672053)

摘　　要："层间氧化矿"是个旧锡矿的主要矿石类型,大部分具有特征的层控性,传统的观点认为"层间氧化矿"是原生硫化矿石在后期被雨水氧化而形成,已有部分地质研究者注意到了"层间氧化矿"的特殊性并提出它们是沉积成因或热水沉积成因。根据个旧锡矿的矿床特征与红海型热水沉积的对比,结合稀土元素地球化学研究,本文认为个旧锡矿存在的"层间氧化矿"的原生矿化类型是特殊的红海型热水沉积,以大量铁锰氧化物为主要成矿标志。个旧锡矿可能是目前红海型热水沉积作用登陆的唯一实例,其成矿模式可概括为三叠纪拉张形成多层原生红海型热水沉积矿化,燕山期花岗岩侵入改造;进而提出通过系统岩相古地理研究以确定古扩张中心和古卤水盆地中心的找矿模式。＂Interstratified oxidized ore＂ is the main mineralization type in the Gejiu tin-polymetallic ore deposit, and it is traditionally suggested that this type of ore is the result of oxidation of primary sulfide ore by water. Although this type of ore has not been emphasized in the past, just based on geological observations, some geologists have suggested that this type of ore could be formed from sedimentary or submarine hydrothermal deposition. According to comparisons of the characteristics ofthe Gejiu tin-polymetallic ore deposit with those of the Red Sea-type hydmthermal deposition, and systematical REE geochemical studies, the authors further deduced that the ＂Interstratified oxidized ore＂ is the product of some special Red Seatype submarine hydrothermal deposition, which is characterized by a lot of Fe-Mn oxides. Till now, the Gejiu tin-polymetallic ore deposit may be the only example of landing of the Red Sea-type submarine hydrothermal deposition. Its metallogenic model includes the formation of multi-layer submarine hydrothermal mineralization firstly asa result of tectonic extension during the Triassic, then superimposed and reworked by Yanshanian magmatic intrusion. ]＇he authors also put forward a new prospecting model with an attempt to constrain the center of palaeo-extension and palaeo-brines basin through systematical lithofacies and paleogeography studies.

关 键 词：红海型热水沉积 层间氧化矿 个旧锡矿 

分 类 号：P611[天文地球—矿床学]