巴颜喀拉构造带二叠-三叠纪岩相特征及构造演化  

Lithostratigraphy Character and Tectonic-Evolvement of Permian-Trias in the Bayankala Tectonic Belt

作　　者：陈守建[1] 李荣社[1] 计文化[1] 赵振明[1] 李国栋[1] 刘荣丽[1] 戴传固 朱迎堂[1,3] 

机构地区：[1]西安地质矿产研究所,陕西西安710054 [2]贵州省地质调查研究院,贵州贵阳550005 [3]成都理工大学地球科学学院,四川成都610059

出　　处：《地球科学（中国地质大学学报）》2011年第3期393-408,共16页Earth Science-Journal of China University of Geosciences

基　　金：中国地质调查局重点项目"青藏高原北部空白区基础地质调查与研究"(No.1212010310101);"青藏高原前寒武纪地质古生代构造-古地理研究"(No.1212010610102);国家自然科学基金(No.40872084)

摘　　要：特提斯洋的形成与演化问题是青藏高原重大基础地质问题之一,通过多年的野外观察、分析测试和综合研究,结合覆盖全区及相邻地区的1∶25万区域地质调查资料及其他前人研究成果,尤其是对巴颜喀拉构造带二叠-三叠纪地层、岩相特征及构造古地理环境进行了系统研究,并探讨了其构造演化,以期对提高青藏高原特提斯洋演化历史和潘吉亚大陆形成特征等方面的研究工作有所禆益.巴颜喀拉构造带未出露前二叠纪地层,二叠-新近纪地层均有出露,尤以三叠纪地层广泛出露为其主要特征.其中,二叠-三叠系主要为海相沉积,比较连续,尤以海相三叠系最具特色,著名的巴颜喀拉山群横贯全区,分布广泛,厚度巨大,侏罗-第四系主要为陆相河湖沉积.二叠系黄羊岭群岩性为碎屑岩、碳酸盐岩夹火山岩,自下而上表现为浅海相-深海、半深海相-浅海相沉积演化特征;三叠系主要为巴颜喀拉山群,岩性单调,主要为砂泥质类复理石沉积,局部地区夹钙质及火山物质,沉积环境总体表现为浅海相-深海、半深海相-滨浅海相-陆相沉积演化序列.二叠-三叠纪构造古地理环境表现为拉张裂陷形成洋(海)盆-汇聚、部分碰撞形成残留洋(海)盆、前陆盆地-拉张裂陷形成洋(海)盆-汇聚、部分碰撞形成残留洋(海)盆、前陆盆地-完全碰撞造山,海水退出,进入陆相沉积演化的历史.巴颜喀拉地区是塔里木-中朝陆块与南方大陆(冈瓦纳陆块)之间古特提斯洋域的主洋盆所在地区之一,与其南部龙木错-双湖洋盆共同构成古特提斯洋域的双洋域.Tethys Ocean formation and evolvement poses one of the important foundamental geological issues in studies concerning the Tibetan Plateau Integrating the field work,data analysis,previous studies,and particularly with the 1∶250 000 regional geology data,in Bayankala tectonic belt during Permian-Trias,including the normal stratum,lithofacies character and tectonic-paleogeography,we discussed the tectonic evolvement in order to improve the research level of the Tethys ocean development in Tibetan Plateau and Rodinia continent formation.The Permian-Neogene’s stratum appears in the main body of Bayankala tectonic belt,characterized by disappearing portion of Trias stratum before Permian.Permian-Trias stratum was continuously aggraded in ocean environment.Bayankala Group is distributed widely and formatting thick in Trias in continent and ocean environment being flysch and little volcanic sediment.Jurassic-Quaternary aggraded in continent formatting river and lake environment.Huangyangling Group aggraded in shallow and deep ocean environment formatting carbonate and fragmentary rock.It evolved from ocean environment to continent environment during Permian-Trias after collision,orogenesis and the blue water vanish,as the north part of main double ocean region contrasting with the south Longmu lake-Shuanghu ocean of Palaeo Tethys ocean lying between Talimu-China-Korea plate and south big continent（Gangwana continent）.

关 键 词：巴颜喀拉构造带 二叠一三叠纪 构造古地理 古特提斯洋 主洋域 构造演化. 

分 类 号：P313[天文地球—固体地球物理学]