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首页> 外文期刊>facies >Carbonate deposition in accretionary prism settings: Early miocene coral limestones and corals of the Makran mountain range in Southern Iran
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Carbonate deposition in accretionary prism settings: Early miocene coral limestones and corals of the Makran mountain range in Southern Iran

机译：增生棱镜环境中的碳酸盐沉积：伊朗南部马克兰山脉的中新世早期珊瑚石灰岩和珊瑚

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摘要

The regional mapping of the Makran mountain range on behalf of the Geological Survey of Iran represents a unique coverage: the entire area of the mountain range was compiled in a unified programme. During this mapping, Miocene limestones containing rich coral and foraminiferal faunas were recorded over a strike length of several hundred kilometres, as minor developments within thick neritic clastic sequences which in turn overlie great thicknesses of Eocene-Miocene flysch. These limestones include rigid bioconstructional frame-works, loosely compacted coralline assemblages and foraminiferal calcarenites: they includein siturecfal deposits and material redeposited quite close to their original site of deposition. Most are Burdigalian, as shown by the benthonic foraminifera, but some are Aquitanian. The geotectonic setting was an accretionary prism in a zone of plate convergence. The limestones and enclosing clastic sediments comprise an intensely folded, reverse-faulted and locally dislocated sequence, the duplex structure being the result of a major Late Miocene-Pliocene episode of regional deformation. This concentration of the intense tectonic deformation in a late major episode requires a different model for this zone of plate convergence to the model widely applied to such zones. The possible controls on limestone deposition are discussed-tectonic uplift and shallowing of the sea, climatic warming and eustatic factors. Depositional features of reefal formations in the late Jurassic of the Caucasus, the Pliocene-Recent of Halmahera, and the early Miocene of SE France are discussed in comparison with the Makran model.
机译：代表伊朗地质调查局对马克兰山脉进行的区域测绘代表了一种独特的覆盖面：整个山脉区域都是在一个统一的方案中编制的。在这次测绘中，在数百公里的走向长度上记录了含有丰富珊瑚和有孔虫动物群的中新世石灰岩，作为厚厚的碎屑岩序列中的微小发展，而这些碎屑岩序列又覆盖了始新世-中新世的大片。这些石灰岩包括刚性生物建筑框架工程、松散压实的珊瑚群落和有孔虫钙质：它们包括非常靠近其原始沉积地点的沉积物和重新沉积的材料。大多数是布尔迪加利亚人，如底栖有孔虫所示，但有些是阿基坦人。大地构造环境是板块辐合带中的吸积棱柱。石灰岩和封闭的碎屑沉积物构成了一个强烈褶皱、反断层和局部错位的序列，双相结构是晚中新世-上新世区域变形的主要事件的结果。在晚期主要事件中强烈构造变形的这种集中需要该板块辐合带的模型与广泛应用于此类区域的模型不同。讨论了对石灰岩沉积的可能控制——构造抬升和海平面浅化、气候变暖和静力因素。本文讨论了高加索晚侏罗世、哈马黑拉上新世-近代和法国东南部中新世早期礁石地层的沉积特征。

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  • 来源
    《facies》 |2006年第1期|141-177|共页
  • 作者

    Dr.JoeMcCall; Dr.BrianRosen; JillDarrell;

  • 作者单位

    Liverpool University;

    The Natural History Museum;

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