塔里木盆地新元古代裂谷盆地层序样式
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中石化石油勘探开发研究院无锡石油地质研究所


The Style of Sequence Stratigraphy of Neoproterozoic Rift Basin in the Tarim Basin
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    摘要:

    塔里木盆地是位于Rodinia超大陆边缘的小陆块,随着新元古代Rodinia超大陆裂解,在塔里木盆地周边和内部形成了大量裂谷盆地,通过对裂谷体系的演化和地层充填特征研究,对认识Rodinia超大陆的裂解过程具有重要意义。按照盆地动力学、层序地层学和沉积学等理论为指导,以露头、钻井和地震剖面为基础,进行不整合面、层序地层和沉积相研究,探讨层序样式及控制因素,分析塔里木盆地和扬子盆地裂谷演化过程的差异。塔里木盆地新元古代南华系-震旦系为1个一级层序,由两个一级不整合界面限定——Td(南华系/前南华系基底)和T1(震旦系/寒武系),其中Td界面为塔里木运动导致,即新元古代早期-中期Rodinia大陆裂解作用开始,而T1界面与塔里木板块内部表现为垂直上升作用的柯坪运动有关。按照裂谷盆地演化的三个阶段——快速裂陷期、稳定沉降期和裂谷萎缩期,分为3个二级层序。快速裂陷期为二级层序SQ1,发育大量小型地垒-地堑盆地,水体由浅变深,发育滨浅海相-河流-三角洲等沉积;稳定沉降期为二级层序SQ2,盆地连通性加强,形成统一的盆地,发育滨岸-三角洲-浅水陆棚-盆地相;裂谷盖处于裂谷萎缩阶段,受地幔柱冷却,地壳回弹影响,断裂活动减弱并逐渐停止,地层向隆起上超,地层分布范围广,主要发育碳酸盐岩台地相,该阶段构成二级层序SQ3。受到海平面变化、冰川和气候等因素控制,发育13个三级层序,其中冰期发育冰碛岩-盖帽碳酸盐岩的一类特殊三级层序。南华纪末期的Marinoan冰期是全球冰期事件,相应在中国南方扬子地区发育典型的南沱组冰碛岩和陡山沱组白云岩的组合,而塔里木盆地库鲁克塔格地区为特瑞爱肯组冰碛岩之上直接覆盖了扎摩提克组的粉砂岩地层,不发育盖帽碳酸盐岩。这和裂谷体系演化有关,塔里木裂谷盖形成的滞后了约70Ma,冰碛岩沉积之后,水体快速加深,碎屑物质供给充足,没有适合碳酸盐岩的生长环境。通过新元古代裂谷盆地的结构样式和层序地层研究,对认识新元古代构造、沉积环境,和烃源岩、储层的分布等具有重要在指导意义,而不同盆地之间大陆裂解响应过程的差异也是值得深入研究问题。

    Abstract:

    With the breakup of Rodinia in Neoproterozoic, some rift basins are formed aroud or in Tarim basin which is a small plate in Rodinia. By studying the evolution of rift basin and stratum, sedimentary, we can know the breakup process of Rodinia. According to the theory of basin dynamics,sequence stratigraphy and sedimentology, the unconformity surface, sequence stratigraphy and sedimentary facies are analyzed with outcrop, well, seismic data, and the evolution and cause of rifting basin are further studied, and the differences of the evolution of rifting between Tarim Basin and Yangtze Basin are studied. The Nanhua and Cathay is the first grade sequence, limited by the unconformity of Td (between the Nanhua and basement) and T1 (between the cambrian and Cathay). Td, acting as the stratum on metamorphosed basement, is caused by the Tarim movement which represents the continental break-up of Rodinia in the Early to Middle Neoproterozoic. And T1 is caused by the vertical lift of Keping movement in Tarim. By the evolution of rift basin, there are three stages, namely rapid chasmic stage, steady subsidence stage and the rift valley shrinking period, respectively corresponding to three second-order sequences. In the rapid chasmic stage which is SQ1, there are many small rift basins of horst and graben, the main facies include shore shelf, fluvial facies and delta facies, when water depth deepens. In the steady subsidence stage which is SQ2, connectivity of the basin strengthens, and then it forms into a unified basin with shoreline facies, delta facies, shallow shelf facies, and basin facies. In the rift valley shrinking period which is SQ3, fault activity is weakened by the mantle plume cooling and Crustal Rebound, and the stratums onlap on the uplift, when the carbonates deposit surrounding the basin. Controlled by the sea level change, glaciations and climate, there are 13 three-order sequences including a special sequence composing of titles and cap-carbontate in the glacial epoch. The titles in Marinoanglacia epoch are distributed in the world, corresponding to the titles in Nantuo formation and cap-carbonate in Doushantuo formation. However, in Quruqtagh area of Tarim basin these titles in Teruiaiken Formation are buried by the siltstone in Zamotike Formation, which is caused by the rifting evolution, and the rift valley cover is lagged about 70Ma. After the sediment of titles, the water deepens fast. Meanwhile there are clastic stones to supply, which restrains the growth of carbonate. The study of Rodina evolution is well for known of Neoproterozoic structural and sedimentary environment, source rocks and reservoirs. A comparison with the responses of break-up of Rodinia among different rifting basins is worth deeper research.

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姜海健,陈强路,杨鑫,储呈林.2017.塔里木盆地新元古代裂谷盆地层序样式[J].地质学报,91(3):588-604.
JIANG Haijian, CHEN Qianglu, YANG Xing, CHU Chenglin.2017. The Style of Sequence Stratigraphy of Neoproterozoic Rift Basin in the Tarim Basin[J]. Acta Geologica Sinica,91(3):588-604.

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历史
  • 收稿日期:2015-08-31
  • 最后修改日期:2015-11-06
  • 录用日期:2017-03-16
  • 在线发布日期: 2017-03-16