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Evidence of Mid-Cretaceous carbon cycle perturbations and OAE2 recorded in Cenomanian to middle Campanian carbonates of the Zagros fold–thrust belt basin, Iran
Journal of Asian Earth Sciences ( IF 3 ) Pub Date : 2021-06-10 , DOI: 10.1016/j.jseaes.2021.104863
Elham Asadi Mehmandsoti , Ahmad Asadi , Jahanbakhsh Daneshian , Adam D. Woods , Sean J. Loyd

The Cenomanian to middle Campanian succession of the Zagros fold-thrust belt basin in Iran was investigated to evaluate the sedimentologic and geochemical response to Oceanic Anoxic Event 2 (OAE2), the Cenomanian–Turonian Boundary Event (CTBE) and Mid Cenomanian Event I (MCEI). The succession was examined at the Chenareh anticline locality, which is situated between the two main tectonic zones of the Zagros fold-thrust belt basin. Petrographic analysis led us to define 10 carbonate microfacies and a shale petrofacies that were deposited in four facies belts: tidal flat, lagoon, shoal, and open marine within a larger platform ramp environment. Carbon isotope and trace element data indicate that the Coniacian to middle Campanian Ilam Formation formed within anoxic to dysoxic settings, with lower amounts of water/rock interaction compared to the underlying Sarvak Formation. Carbon isotope chemostratigraphy allows the CTBE and MCEI evidence to be distinguished within the Zagros Basin, however, values measured by this study are depleted compared to other published chemostratigraphic records of the event. The results, therefore, demonstrate that diagenesis or a local CTB hiatus affected the record of these global events in the study area at the Zagros Basin.



中文翻译:

在伊朗扎格罗斯褶皱冲断带盆地的森诺曼阶至中坎帕阶碳酸盐岩中记录的中白垩世碳循环扰动和 OAE2 的证据

研究了伊朗 Zagros 褶皱冲断带盆地的森诺曼阶至中坎帕阶序列,以评估对大洋缺氧事件 2 (OAE2)、森诺曼阶-土伦边界事件 (CTBE) 和森诺曼阶中期事件 I (MCEI) 的沉积学和地球化学响应)。在位于 Zagros 褶皱冲断带盆地的两个主要构造带之间的 Chenareh 背斜位置检查了该序列。岩相学分析使我们确定了 10 个碳酸盐微相和一个页岩岩相,它们沉积在四个相带中:潮滩、泻湖、浅滩和更大的平台斜坡环境中的开阔海相。碳同位素和微量元素数据表明 Coniacian 至中 Campanian Ilam 组形成于缺氧至缺氧环境中,与下伏的 Sarvak 地层相比,水/岩石相互作用较少。碳同位素化学地层学允许在扎格罗斯盆地内区分 CTBE 和 MCEI 证据,但是,与其他已发表的事件化学地层学记录相比,本研究测量的值已经耗尽。因此,结果表明,成岩作用或局部 CTB 中断影响了 Zagros 盆地研究区域中这些全球事件的记录。

更新日期:2021-06-15
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