Seismic Evidence of Thrust-Fold in Carlin-Type Gold Deposit, Central Southwestern Guizhou and Its Significance
详细信息
- 责任者：Hu Yuzhao (Faculty of Land and Resource Engineering ; Kunming University of Science and Technology ; Kunming 650093 ; China) ; Zhang Guiquan
- 刊名：Earth Science Frontiers
- 出版年：2012
- 卷期：19(4)
- 关键词：卡林型金矿床 ; Carlin-type gold deposit ; 贵州 ; Guizhou Province
- 页码：p.63-71
- 图表：4 illus., 45 refs.
- 分类号：1001
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
///The seismic reflection data collected across central southwestern Guizhou clearly revealed the coal measures of upper Permian Longtan Formation and Dongwu and Guangxi unconformities in Carlin-type gold deposit.Most Carlin-type gold deposits are controlled by thrust-fold in this area.Based on seismic profile,the gold deposits could be divided into two types,i.e.,thrust-controlled and thrust-accompanied deposit according to the position of deposit in the thrust-fold belt.In thrust-controlled deposits,the thrust with steep dip in superficial part and shallow dip in deep level was detached from coal measures,tuffs and Dongwu unconformable contact;fault-related fold always occurred on the hanging wall block;gold ore bodies occurred in thrust with vein shape in shallow level and low angle strata-dissecting shape in deep level.The thrust-accompanied gold ores occurred in interlayer-gliding structures caused by high-angle faults with stratiform-like ore bodies.Northwestern and northeastern trending thrust-fold zone were generated by successional closure of Paleo-Tethys Ocean in South China during the late Indosinian epoch.The seismic data also show that there are some thrust-folds similar to the structure of the structure zones where Carlin-type gold deposits were discovered,suggesting an ore prospective area.