摘要
湖北远安杨家冲不整合面是2016年在该区进行早三叠世海生爬行动物化石发掘过程中被发现的,它是鄂西地区印支运动第一幕的有力证据。结合下三叠统嘉陵江组三段地层结构、构造特征和同位素资料,证实本处印支一幕起始于早三叠世晚期,主幕发生于早三叠世末期,其运动方式为大范围的隆拗运动和地表浅部的层间滑动和岩层穿层现象,岩层穿层形成近等距的地层产状陡缓相间分布。根据地层直观显示,陡处与上覆地层间形成角度不整合接触,缓处与上覆地层呈平行不整合接触。结合扬子区区域特征,证实鄂西地区是印支一幕隆起最高处。本不整合面具有非常重要的构造学、地层学和古地理古环境研究意义。
Yangjiachong unconformity in Yuan’an,Hubei province was discovered in 2016 during the excavation of the early Triassic Marine reptile fossil in this area.It is the strong evidence of the first act of Indosinian movement in western Hubei.Based on the structural characteristics and isotopic data of the lower Triassic Jialingjiang formation,this paper suggested that the Indosinian episode began in the late early Triassic and the main episode occurred in the latest early Triassic,the movement pattern was a wide range of uplift movement,interlayer sliding and strata penetration in the shallow part of the surface,and the strata penetration formed a nearly equidistant strata occurrence with steep and slow interphase distribution.According to the strata formation,angular unconformity contact is formed between the scarp and the overlying strata,and parallel unconformity contact is formed between the flat and overlying strata.Combined with the regional characteristics of Yangtze area,it is proved that the western Hubei area is the highest elevation of the the first indosinian uplift.This unconformity has important significance in the study of tectonics,stratigraphy and paleogeography and paleoenvironment.
作者
谭秋明
李姜丽
赵璧
邹亚锐
陈刚
尹伟
Tan Qiuming;Li Jiangli;Zhao Bi;Zou Yarui;Chen Gang;Yin Wei(Hubei Institute of Geoscience,Wuhan,Hubei 430034)
出处
《资源环境与工程》
2019年第4期449-453,共5页
Resources Environment & Engineering
基金
远安县地方财政项目——湖北远安下三叠统海生爬行动物化石发掘研究
湖北省地质局科技项目(KJ2018-2、KJ2019-1)资助
关键词
不整合面
地质意义
远安
unconformity
geological significance
Yuan’an
