印支晚期冲断-褶皱活动在黔西南中部卡林型金矿成矿中的作用——以地震勘探资料为例.pdf

2011年10月
矿床地质
第30卷第5期
October. 2011
MINERAL DEPOSI'TS
Vol. 30 No. 5
文章编号:0258-7106(2011)05-0815-13
印支晚期冲断-褶皱活动在黔西南中部卡林型金矿
成矿中的作用
以地震勘探资料为例
胡煜昭,王津津2,韩润生,衣成利3
(1昆明理工大学国土资源工程学院,云南昆明650093;2陕西省地质矿产勘査开发院,陕西西安700100
3浙江省有色金属地质勘查局地质环境研究院,浙江绍兴31200
摘要地震勘探资料对黔西南中部卡林型金矿赋存层位上二叠统龙潭组煤系地层、东吴不整合面和广西不
整合面显示良好。该地区卡林型金矿主要受古隆起和冲断-褶皱构造的双重控制。根据卡林型金矿在沖断-褶皱构
造中的位置,可以将其划分为2类,即断层控制型金矿和断层伴生型金矿。在断层控制型金矿床中,断层“上陡下
级”,为低角度逆冲断层,断层上甜常发育不对称背斜,断层向下在上二叠统龙潭组煤系地层、“大厂层”凝灰岩和东
吴运动形成的不整合面间滑脱,并造成地层明显増厚,金矿体产于低角度逆冲断层中,在浅部为脉状矿体,在深部渐
变为缓倾斜穿层矿体。断层伴生型金矿床发育于由高角度断层引起的层间滑动带中,呈似层状。印支晚期华南古
特提斯洋的相继闭合是形成北西向和北东向两组主要冲断-褶皱构造的构造动力学背景。尽管前期占隆起对卡林型
金矿具有初始富集作用,但冲断-褶皱活动则是金矿形成的关键。地震探资料揭示,黔西南中部还存在找矿前景较
好的冲断-褶皱构造。
关键词地质学;卡林型金矿;神断-褶皱构造;古隆起;黔西南中部
中图分类号:P618.51
文献标志码:A
Role of Late Indosinian thrust-folding in ore-forming process of Carlin
type gold deposits, central southwestern Guizhou: Seismic evidence
HU Yuzhao-, WANG Jinjin, HAN Runsheng and YI Chengli
(I Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2 Institute of Geology and Mineral Exploration of Shaanxi Province, Xi'an 700100, Shaanxi, China; 3 Instiute of
Geological Environment, Zhejiang Bureau of Geolgy for Nonferrous Metal Resources, Shaoxing 312000, Zhejiang, China
Abstract
Seismic refection data collected across central southwestern Guizhou have shed a light on coal measures Of
upper Permian Longtan Formation as well as on wu and Guangxi unconformities in Carlin-type gold deposits
Seismic profiles and regional gravity have also indicated that most Carlin-type gold deposits are controlled by both
baleo-uplift and thrust-fold in this area. On the basis of the seismic profile, gold deposits can be divided into two
types, namely thrust-controlled and thrust- accompanied desits according to the position of the ore deposit in
the thrust-fold belt. In thrust-controlled deposits, the thrust characterized by steeply dip angles in the shallow
part and smoothly dip angles in the depth detaches into coal measures, tuffs and Dongwu unconformable contact
x本文得到全国危机⑩山西南地区典型矿床成矿規律总结研究项日(项目编号:20089943)资助
第一作者简介胡煜昭,男,1964年生,博土,高级丁程师,主要从事沉积盆地资源、能源劫查和研究。Fmai: huvuzhao155@sohu.corm
收稿口期2010-06-08;改同用期2011-07-04张绮玲编辑。