摘要
紫阳石门湾铅锌矿位于扬子地块西北缘的活动大陆边缘,其构造环境为古生代的弧后盆地。该矿处于马元地区大型铅锌矿带与湖北竹溪朝阳铅锌矿带之间,备受关注。经地表追索及工程控制,共圈出铅锌矿体6条。矿体呈似层状、透镜状,长度72～292m,厚度0.78～4.06m;Pb平均品位为1.47%～2.83%,Zn平均品位为2.38%～8.45%。矿体产于上震旦统第二岩性段上亚段白云岩中,矿体与地层产状基本一致,受一组顺层断层破碎带控制。初步认为矿石中的微量元素来源于成矿围岩,矿床中的原始Pb主要来源于壳幔混合的造山带。紫阳石门湾铅锌矿与沉积有关,后期有不同程度的改造。初步认为本区铅锌矿成因类型属于沉积-改造型。
The lead-zinc mine in Shimenwan, Ziyang county is situated in the active continental margin of northwestern Yangtze Block, with the tectonic setting of Paleozoic back-arc basin. Lying between the large lead-zinc metallogenic belt in Mayuan area and that in Chaoyang, Zhuxi County, Hubei Province, the mine is attracting more and more attention. By surface recourse and engineering control, 6 belts of lead-zinc ore body were delineated. Being stratiform and lenticular, the ore body is 72-292 m long and 0. 78-4.06 m thick. The average grade of Pb con- centration is 1.47%-2.83% and the average grade of Zn is 2. 38%-8. 45%. Formed in the dolostone in upper second lithologic section of upper Sinian series, the occurrence of ore body is consistent with that of stratum, and is controlled by a group of bedding fault fractured zone. It is considered that the trace elements in the ore comes from the metallogenic surrounding rock, the premitive Pb is largely from the crust-mantle orogenic belt. The lead-zinc mine in Shimenwan is realted to sedimentation, and experienced different degrees of reformation later. The genetic type of studied lead-zinc mine is therefore regarded as reformed sedimentary deposit.
出处
《西北地质》
CAS
CSCD
2013年第2期128-140,共13页
Northwestern Geology
基金
"十一五"国家科技支撑计划项目"中西部大型矿产基地综合勘查技术与示范--西秦岭成矿地质背景与铅锌
银
铜
金资源评价技术研究"(2006BAB01A11)
关键词
扬子地块西北缘
铅锌矿
地质特征
紫阳石门湾
northwestern margin of Yangtze block
lead-zinc deposit
geological characteristics
Shimenwan
Ziyang county
