地质通报2018，Vol.37Issue(4)：621-633,13.
南祁连党河南山地区巴龙贡噶尔组的解体与岩石地层单位厘定——来自岩石学与年代学的证据
The disintegration of Balonggongge'er Formation and the definition of lithostratigraphic unit in Danghenanshan area of South Qilian Mountain:Evidence from petrology and chronology
摘要
Abstract
There exist a series of regional low-temperature dynamometamorphiic rocks in Danghenanshan area of South Qilian Mountain,which were previously classified as Balonggongge'er Formation.Studies of petrology,isotope chronology and stratigraphic correlation show that these rocks are obviously different from typical Balonggongge'er Formation and hence the authors redefined it as Guaizhangshan Formation.The Guaizhangshan Formation is composed of schists and volcanic rocks with strong structural deforma-tion.The original rocks of the schists are low mature greywacke and lithic sandstone,and the volcanic rocks are made of intermedi-ate-basic volcanic rock and pyroclastic rock.Therefore,the rock association indicates the characteristics of volcanic–sedimentary for-mation.The LA-ICP-MS U-Pb high precision age of the basaltic andesite in Guaizhangshan Formation is 734±8.5Ma,suggesting that it was formed in Neoproterozoic. The results of stratigraphic correlation suggest that the Guaizhangshan Formation had a wide distribution. The provenance and sedimentary characteristics of Guaizhangshan Formation indicate that its sedimentary environment was a continental rift basin and its formation resulted from the sedimentary response to the Rodinia supercontinent breakup event. Therefore, the discovery and establishment of the Guaizhangshan Formation provide important evidence for building stratatigraphic framework in Qilian block and studying tectonic evolution of the Qilian Mountain.关键词
新元古代/巴龙贡噶尔组解体/岩石地层单位厘定/拐杖山组/党河南山Key words
Neoproterozoic/disintegration of Balonggongge'er Formation/definition of lithostratigraphic unit/Guanzhangshan For-mation/Danghenanshan area分类
天文与地球科学引用本文复制引用
计波,余吉远,李向民,黄博涛,王磊..南祁连党河南山地区巴龙贡噶尔组的解体与岩石地层单位厘定——来自岩石学与年代学的证据[J].地质通报,2018,37(4):621-633,13.基金项目
中国地质调查局项目《祁连成矿带肃南—大柴旦地区地质矿产调查》(编号:DD20160012) （编号:DD20160012）
