投稿时间：2015-12-17
修订日期：2016-12-23
网络发布日期：2017-03-11
中文摘要:骆驼山硫多金属矿床位于豫西栾川钼多金属矿集区，矿体主要呈似层状和透镜状产于新元古界栾川群三川组和南泥湖组的层间断裂带内的矽卡岩中，受NWW向层间断裂带的控制。该矿床在成因方面的争论的焦点在于：是否存在元古代的喷流沉积成矿作用?具有纹层状构造的硫化物矿石以往被认为是喷流沉积成因矿床的关键证据，但这种矿石结构也可能为热液交代成因。通过详细的野外地质观察，纹层状矿石在空间上主要产于矽卡岩与致密块状硫化物矿石之间，在透辉石长英角岩、矽卡岩及大理岩等围岩中也有分布，纹层状矿石交代了矽卡岩。针对纹层状矿石中的金属硫化物开展LA-ICP-MS原位微区分析，结果表明：①闪锌矿形成于中高温环境，其微量元素以富Fe、Mn、In、Co（均值分别为8.5%、6144×10-6、321×10-6和28.54×10-6），贫Ga、Ge、Tl（均值分别为4.31×10-6、0.98×10-6和0.0476×10-6）等元素为特征；②磁黄铁矿和黄铁矿的微量元素组成均具有富Co（均值分别为57.75×10-6和2787.68×10-6）、贫Ni（均值分别为19.24×10-6和11.29×10-6）的特征，二者的Ni-Co关系图指示其与岩浆热液密切相关。以地质现象为基础，结合硫化物原位微区分析数据，笔者认为骆驼山硫多金属矿床中的纹层状矿石属于岩浆热液成因。
Abstract:The Luotuoshan sulfur polymetallic deposit is located in the Luanchuan Mo polymetallic ore concentration area of western Henan Province. The orebodies mainly occur in the skarn of interbedded fault zone of Sanchuan Formation and Nannihu Formation of Neoproterozoic Luanchuan Group, controlled by NWW-trending interbedded fault zone. The focus of controversy concerning ore genesis lies in whether it was formed from the exhalative sedimentary mineralization or not. The lamellar ores are considered as key evidence for the exhalative sedimentary deposit, but previous studies argue that the hydrothermal metasomatic genesis might also hold water. In the spatial distribution, the lamellar ores mainly occur between skarns and dense massive sulfide ores and some are distributed in minerals of wall rocks such as diopside feldspar and quartz hornfels, skarns and marbles, as shown by detailed field geological observation. The geological features suggest that the lamellar ores have replaced skarns. The authors investigated the trace elements compositional characteristics of metal sulfide of the lamellar ores in the Luotuoshan sulfur polymetallic deposit by using new technology of LA-ICP-MS in situ microanalysis. Some results have been obtained:① The sphalerite formed under the condition of medium-high temperature and is characterized by rich Fe, Mn, In, Co (with average value of 8.5%, 6144×10-6, 321×10-6 and 28.54×10-6, respectively) and poor Ga, Ge and Tl (with average value of 4.31×10-6, 0.98×10-6 and 0.0476×10-6, respectively). ② The trace elements of pyrrhotite and pyrite are characterized by rich Co (with average value of 57.75×10-6 and 2787.68×10-6) and poor Ni (with average value of 19.24×10-6 and 11.29×10-6). The Ni-Co binary diagrams of pyrrhotite and pyrite indicate that this deposit is closely related to magmatic hydrothermal. Based on field geological features and the data in situ microanalysis of sulfides, the authors hold that the lamellar ores are of magmatic hydrothermal genesis, and this discovery provides effective constraint on the genesis of the Luotuoshan sulfur polymetallic deposit.
keywords:geochemistry in situ microanalysis of sulfides lamellar ores magmatic-hydrothermal genesis submarine exhalative sedimentary genesis western Henan Province
文章编号：
中图分类号：P618.41
文献标志码：
基金项目:本文得到中央级公益性科研院所基本科研业务费专项资金（编号：K1308）和栾川铅锌矿集区成岩、成矿系统的时空结构专题研究（编号：2011BAB04B06）联合资助
引用文本：
邢波,向君峰,叶会寿,陈小丹,张国苏,杨晨英,金雪,胡志中.2017.豫西骆驼山硫多金属矿床的成因——来自纹层状矿石中硫化物LA-ICP-MS微量元素证据[J].矿床地质,36(1):83~106XING Bo,XIANG JunFeng,YE HuiShou,CHEN XiaoDan,ZHANG GuoSu,YANG ChenYing,JIN Xue,HU Zhizhong.2017.Genesis of Luotuoshan sulfur polymetallic deposit in western Henan Province: Evidence from trace elements of sulfide revealed by using LA-ICP-MS in lamellar ores[J].Mineral Deposits36(1):83~106
图/表
