摘要
以羌北坳陷龙尾错地区雪山组地层为例,通过对沉积物来源、古生态、碳氧同位素、粒度特征及其沉积序列、古水流向的研究,揭示了上侏罗统—下白垩统雪山组地层沉积时期的沉积环境及古地理格局,认为该区雪山组地层是在中央隆起带露出水面并向羌北地区提供物源的古构造—地理条件下形成的三角洲沉积体系,具辫状河成因的显著特点。
Taken the Xueshan Formation in the Northern Depression of Qiangtang Basin as an example,the source of the Xueshan Formation deposits,the paleoecology,the carbon and oxygen isotope character,the sedimentary sequence,the granulometric character and palaeocurrent indicator have been studied in this paper,accordingly discussing the sedimentary environment and its significance. With all the proofes and relevant discusses presented above, we can see that the Upper Jurassic--Lower Cretaceous Xueshan Formation should be formed in palaeodelta sedimentary environment. During that time, the central uplift zone of the Qiangtang Basin raised above sea level for tectonic reason, and provided stable deposits from central uplift to the Northern Depression. The deposits of the Xueshan Formation therefore show manifest braided river characters.
出处
《地层学杂志》
CSCD
北大核心
2008年第1期33-40,共8页
Journal of Stratigraphy
基金
国家油气专项(XQ2004-06)资助
关键词
辫状河
三角洲
雪山组
侏罗系
白垩系
羌北坳陷
西藏
braided river, delta, Xueshan Formation, Jurassic, Cretaceous, Northern Depression, Qiangtang Basin, Tibet
