地质通报2018，Vol.37Issue(2)：337-344,8.
阿尔金山北缘恰什坎萨依地区逆冲推覆构造的发现及其构造意义
摘要
Abstract
The Qiashikansayi area of Altun Mountains is located in the western segment of Hongliugou- Lapeiquan structural belt, which is bounded by the NE-trending Altun strike-slip faults to the north and EW-trending northern Altun fault. There volca-nic-sedimentary rocks are well developed,which are assigned to Lapeiquan Group and divided into three formations:the lower for-mation (volcanic rock formation), medium formation (fragmental rock formation) and upper formation (carbonate rock formation). Based on the field study and mapping in Qiashikansayi gully, Goukouquan iron ore area and Beiketan area, the author discovered a series of thick bedded carbonate rocks as an irregular top cover outcropped at high hills or ridge of hills and contacting with frag-mental rock or volcanic rock under them by lower angle fault, which constitute the typical thrust outlier structure. The volcanic rock and fragmental rock are dated as Ordovician,while the thick bedded carbonate rocks are not dated by any accurate biostrati-graphic or chronologic evidence.It is very probable that thick bedded carbonate rocks may be of Meso-Proterozoic period and the Lapeiquan Group was broken up into two parts: one was a new Lapeiquan Group (only consisting of volcanic rock formation and fragmental rock formation), and the other was carbonate rocks formation of Meso-Proterozoic period. According to the age of Binggou granite body which cut off the thrust nappe structural zone, the author considers that the thrust nappe formed in Middle to Late Ordovician epoch (about 460Ma). All these features are identical to specious tectonic setting of the closure of the Hongliu-gou-Lapeiquan rift (or back-arc basin or limited ocean basin)and of the collision belt of convergent plate in Middle to Late Ordo-vician epoch and their evolution history.关键词
逆冲推覆构造/恰什坎萨依/拉配泉群/构造演化/阿尔金山北缘Key words
thrust nappe structure/Qiashikansayi area/Lapeiquan Group/tectonic evolution/northern margin of Altun Mountain分类
天文与地球科学引用本文复制引用
陈柏林..阿尔金山北缘恰什坎萨依地区逆冲推覆构造的发现及其构造意义[J].地质通报,2018,37(2):337-344,8.基金项目
国家科技支撑计划重点项目《阿尔金成矿带多元信息成矿预测与找矿示范》(编号:2011BAB06B08-04)、《阿尔金山东段红柳沟矿带大型铜、金、铅锌矿床找矿靶区优选与评价技术与应用研究》(编号:2006BAB07B02-04)和中国地质调查局项目《阿尔金喀腊大湾地区铁多金属矿构造控矿研究与找矿预测》(编号:1212011085043) （编号:2011BAB06B08-04）
