塔里木盆地肖尔布拉克上震旦统苏盖特布拉克组层序界面与沉积相

The stratigraphic and sedimentation analysis of Sugaitbulak Formation of the Upper Sinian at Xianerbulak of Aksu in Tarim Basin

震旦纪是塔里木盆地被动大陆边缘盆地重要发育期。通过对阿克苏肖尔布拉克剖面中的上震旦统苏盖特布拉克组实测工作,利用层序地层学和沉积相分析方法,提出了苏盖特布拉克组发育了海侵不整合、陆上暴露不整合和隆升侵蚀不整合面等Ⅱ—Ⅲ(Ⅳ)层序界面成因类型;揭示了下亚段(潮坪)滨岸—浅海沉积体系中的潮间—潮上、滨岸沙丘、风暴等沉积;上亚段浅海—陆架(碎屑陆棚)体系中的潮道—外滨、浅水陆棚沉积;下亚段发育了玄武岩墙、上亚段夹有酸性火山岩;上述沉积建造与火山活动反映了被动大陆边缘盆地裂陷早-中期发育的特征。

Sinian is one of the most important stage of development of passive continental margin basin in Tarim Basin. Based on the measurement and analysis of section of Sugaitbulak Fro. （Z2s） of the Upper Sinian at Xianerbulak of Aksu with regarded to lithofacies, sequence stratigraphy and facies succession fabric features and the orderly stacking patterns, The uplift- corrosion unconformity in the lower,transgressive onlap unconformity between upper and lower section and exposure meteoric-formation and facies change-correlative conformity on the top of Sugaitbulak Fm. （Z2s）have been identified as Ⅱto Ⅲ（Ⅳ） sequence boundary surfaces. The sedimentation environment of Sugaitbulak Fm. （Z2s） is believed to the coastal to shore to open shalf-ramp and slope clastic system,The lower section of Sugaitbulak Fm. consists of the tidal- flat, shore-dune, shore and foreshore and outer upper shore sedimentation; while the upper the nearshore, tidal channel-outer shore and open shalf-ramp and slope sedimentation; The terrestrial eruption of the basalt-rhyolite and tuff, which are used to interpolation of diabase dyke, suggested as the continental break-up product in the development of passive continental margin basin of the Sinian to the early Palaeozoic stage.