塔里木盆地南华纪—震旦纪盆地类型及早期成盆构造背景
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摘要
通过对比塔里木盆地南华系—震旦系盆缘露头和盆内岩心,辅以全盆地震解释成果的制约探讨盆内震旦系分布特征,同时结合大地构造背景恢复探讨其早期原型盆地及构造演化。塔里木陆块在罗迪尼亚超大陆聚合过程中加入较晚并且于南华纪最早裂离,发育新元古代冰碛岩和多期火成岩事件,大陆裂谷广泛发育,在盆地东北和西南地区优先发育,塔东南阿尔金地区进入寒武纪后开始发育。盆地南北缘差异明显,南华—震旦纪北部发育伸展断陷,并且在东北部发生强烈伸展,塔里木北部存在东西向裂谷以及满加尔拗拉谷,震旦系主要分布在塔里木盆地北部,该地区为主要的沉积中心,北部沉积在盆地中部地区尖灭,南部地区可能长期为隆起剥蚀区,南缘在新元古代晚期可能涉及陆缘的俯冲增生改造抬升。
The prototype and tectonic evolution of Tarim Basin from the Nanhua to the Sinian Period are discussed based on the field observations in the northern margin of Tarim Basin and combined with seismic interpretation and comparison of drilling wells'data.It is concluded that the Tarim block aggregated into Rodinia supercontinent at latest and departed from Gondwana supercontinent at the earliest,which caused that the continental rift system mainly formed in Northeast and Southwest Tarim.Neoproterozoic diamictite and multi-phased igneous events impacted the whole Tarim block.The northern and southern parts of Tarim show distinct differences;the northern has undergone extensional events corresponding to the breakup of Rodinia and crustal thinning during the Sinian-Cambrian Period and developed graben basins and Sinian strata that were gradually pinching out in the central Tarim and mainly distributed in the north as the depocenter;the south may have been the uplift-erosion area for a long period,and the southern margin was possibly involved plate in marginal subduction,accretion and uplift in the late Neoproterozoic.
引文
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