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首页> 外文期刊>Stratigraphy >Permian Sequence stratigraphy in east-central Iran: Microplate records of Peri-Tethyan and Peri-Gondwanan events
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Permian Sequence stratigraphy in east-central Iran: Microplate records of Peri-Tethyan and Peri-Gondwanan events

机译：伊朗中东部的二叠纪层序地层：Peri-Tethyan和Peri-Gondwanan事件的微孔板记录

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摘要

Permian rocks in east-central Iran (Posht-e-Badam and Tabas blocks) belong to well-defined sequences in juxtaposed Early and Late Permian biogeographic provinces. The Lower Permian Khan Formation in the Kalmard area (Within the Posht-e-Badam) block) is composed of cyclic sequences of thick compositionally and texturally mature sandstones and thin carbonates. The sequences reflect several nearshore microfacies, which constitute three major paleoenvironmental associations: tidal flat, lagoon, and shoal (open marine microfacies are missing or very rare). The carbonate rocks of the Lower through Upper Permian Jamal Formation in the Shotori and Shirgesht areas (within the Tabas block) are comprised of four microfacies indicative of tidal flat, lagoon, foreshore and open marine paleoenvironments. The Jamal Formation was deposited on a homoclinal carbonate ramp, which deepens to the north (Bagh-e-Vang section) and thins in southern locations (near the Jamal Formation type section). The Khan Formation succession is composed of second- and third-order cyclically siliciclastic and carbonate sequences. The Jamal carbonate is composed of second- and third-order shallowing-upward sequences. Both local tectonic activity and global eustacy may have controlled the cyclicity of the Khan and Jamal formations.
机译：伊朗中东部的二叠纪岩石（Posht-e-Badam和Tabas地块）属于并列的早二叠世和晚二叠纪生物地理省中的明确序列。卡尔马德地区（在Posht-e-Badam地块内）的下二叠系可汗组由厚的组成和质地成熟的砂岩和薄的碳酸盐的循环层序组成。这些序列反映了几个近岸微相，它们构成了三个主要的古环境关联：滩涂，泻湖和浅滩（开放的海洋微相缺失或非常罕见）。 Shotori和Shirgesht地区（塔巴斯地块内）的下至上二叠统Jamal组的碳酸盐岩由四个微相组成，分别表示潮滩，泻湖，前滨和开放的海洋古环境。贾马尔组沉积在同质碳酸盐岩斜坡上，向北加深（Bagh-e-Vang剖面），在南部位置变薄（靠近贾马尔组类型剖面）。可汗层序由二阶和三阶的周期性硅质碎屑岩和碳酸盐岩层序组成。贾马尔碳酸盐岩由二阶和三阶浅向上序列组成。局部构造活动和整体节水都可能控制了汗和贾马尔形成的周期性。

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