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The Lower Triassic Sorkh Shale Formation of the Tabas block, east central Iran: Succession of a failed-rift basin at the paleotethys margin

机译：伊朗东部中部塔巴斯区块的下三叠世苏尔克页岩组：古断陷边缘断陷裂陷盆地的演替

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摘要

The Lower Triassic Sorkh Shale Formation is a dominantly red colored marginal marine succession deposited in the north-south trending Tabas Basin of east central Iran. It is correlated with the unconformity-bounded lower limestone member of the Elika Formation of the Alborz Mountains of northern Iran. The Sorkh Shale is bounded by the pre-Triassic and post-Lower Triassic interregional unconformities and consists mainly of carbonates, sandstones, and evaporites with shale being a minor constituent. Detailed facies analysis of the Sorkh Shale Formation resulted in recognition of several genetically linked peritidal facies that are grouped into restricted subtidal, carbonate tidal flat, siliciclastic tidal flat, coastal plain and continental evaporite facies associations. These were deposited in a low energy, storm-dominated inner-ramp setting with a very gentle slope that fringed the Tabas Block of east central Iran and passed northward (present-day coordinates) into deeper water facies of the Paleotethys passive margin of northern Cimmerian Continent. Numerous carbonate storm beds containing well-rounded intraclasts, ooids and bioclasts of mixed fauna are present in the Sorkh Shale Formation of the northern Tabas Basin. The constituents of the storm beds are absent in the fair weather peritidal facies of the Sorkh Shale Formation, but are present throughout the lower limestone member of the Elika Formation.
机译：下三叠世索尔克页岩组是沉积在伊朗中东部的南北向塔巴斯盆地的主要为红色的边缘海相演替。它与伊朗北部Alborz山脉Elika组的不整合面受限的下部石灰岩成员相关。 Sorkh页岩受三叠纪前和下三叠纪后区域间不整合的限制，主要由碳酸盐，砂岩和蒸发岩组成，页岩为次要成分。通过对Sorkh页岩层的详细相分析，人们认识到了几种遗传相关的围岩相，这些相被分为受限制的潮下带，碳酸盐岩潮带，硅质碎屑潮带，沿海平原和大陆蒸发岩相。这些沉积物沉积在低能量，以风暴为主的内斜坡环境中，其斜坡非常平缓，环绕在伊朗中东部的塔巴斯区块边缘，并向北（目前的坐标）通过，进入了西奇米扬州北部古生物的被动边缘的深水相大陆。塔巴斯盆地北部的Sorkh页岩组中存在大量碳酸盐岩风暴床，其中包含完整的碎屑，卵石和混合的动物碎屑。 Sorkh页岩组的晴天围岩期不存在风暴床的成分，但整个Elika组的下部石灰岩段都存在。

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  • 来源
    《Carbonates and Evaporites》 |2008年第1期|21-38|共18页
  • 作者

    Yaghoob Lasemi; Mostafa Ghomashi; Hadi Amin-Rasouli; Ali Kheradmand;

  • 作者单位

    Department of Geology Tarbiat Moallem University Tehran Iran;

    Department of Geology Sistan and Baluchestan University Zahedan Iran;

    Faculty of Natural Resources Kurdistan University Sanandaj Iran;

    Department of Geology Shahid Bahonar University Kerman Iran;

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