摘要
利用大量钻测井及地震资料,通过对邻近前缘隆起的隆后坳陷地层特征的分析以及与库车河露头的对比,探讨了塔里木盆地三叠纪前缘隆起的迁移演化规律。结果表明,三叠纪前缘隆起发生了 3 次往复迁移,隆后坳陷地区发育多期不整合面,且最大不整合面均发育于地层的底部。早三叠世,隆后坳陷地层南厚北薄,早期前缘隆起向天山方向迁移,隆后坳陷地层超覆其上,前陆坳陷变窄; 晚期则向克拉通方向迁移隆升,邻近的隆后坳陷地层遭受强烈剥蚀。由于前缘隆起的遮挡作用,该时期前陆坳陷与隆后地区尚未贯通,山前发育冲积扇。中、晚三叠世前缘隆起又发生两次迁移,其迁移特征与早三叠世类似,但中三叠世前陆坳陷与隆后坳陷仍未相连,而晚三叠世两者相互连通。
Based on a large amount of logging and seismic data,and a comparison with Kuqa River outcrop,the characteristics of back-bulge strata and unconformities of the Triassic which developed near forebulge area in Tarim Basin are comprehensively analyzed,and then the forebulge migration and evolution are discussed.The results show that during the Triassic the forebulge had experienced three times reciprocating migration,with Early,Middle and Late Triassic once respectively.Many unconformities were developed in the back-bulge area,with maximum unconformity located at the bottom. During the earlier Early Triassic, the forebulge which migrated toward Tianshan Mountain was onlapped by back-bulge strata,with the strata being thinner to the north and a narrower foredeep left. However,during the late Early Triassic,the forebulge moved and uplifted toward craton,with nearby back-bulge strata severely eroded.Simultaneously,because of the blocking of forebulge,the foredeep couldn't connect with back-bulge zone,and the alluvial fan developed under mountains.The characteristics of two later migrations were similar to that of the Early Triassic,but the back-bulge and forebulge were separated during the Middle Triassic and connected during the Late Triassic.
出处
《古地理学报》
CAS
CSCD
北大核心
2013年第2期219-230,共12页
Journal of Palaeogeography：Chinese Edition
基金
国家重点基础研究发展计划项目(编号:2009CB219407)
国家自然科学基金项目(编号:40972077)共同资助
