等深岩识别标志研究  

CHARACTERISTICS AND MECHANISM OF NEOTECTONIC MOVEMENT IN THE CHAIDAM BASIN

作　　者：李日辉[1] 张光威[1] 李维群[2] 

机构地区：[1]地质矿产部海洋地质研究所 [2]东北大学黄金学院地质系

出　　处：《海洋地质与第四纪地质》1997年第3期63-70,共8页Marine Geology & Quaternary Geology

基　　金：国家教委留学回国人员科研启动基金

摘　　要：等深岩的识别标志可分为沉积学标志、古生物学标志和古地理标志三大类。沉积学标志主要是成份、粒度、分选以及沉积构造等。研究发现，遗迹化石也是一个重要的识别标志。等深岩往往与Ｎｅｒｅｉｔｅｓ遗迹相伴生，特别与其中的网状遗迹类关系密切。而且，网状遗迹的Ｐａｌｅｏｄｉｃｔｙｏｎ遗迹属还可用来指示等深流方向。由于各种标志大多具有多解性，因此在识别等深岩时应采用多种标志的综合。In general,the Chaidam Basin in neotectonic period was considered as a compressive basin controlled by Indian plates collision.But based on the crust mantle structure,geophysical background,sedimentary cyclic texture,multi layered geomorphic accident and structural style,the author thinks that the Chaidam Basin is an extended basin compared with rift type basins in eastern China.The extension of the basin alternated with contraction.The former resulted from mantle diapir,while the latter was controlled by two factors:subordinate compressive stress from the basin extension and intraplate stress.Lastly,the double layer evolutional model of the Chaidam Basin is presented in the paper,that is,mantle diapir(uplift)→lower crust extension and passive compression+intraplate stress→upper crust contraction.

关 键 词：等深岩 识别 沉积特征 Nereites遗迹相 沉积岩 

分 类 号：P588.2[天文地球—岩石学]