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首页> 外文期刊>Journal of Asian earth sciences >Platform-slope transition during rifting: The mid-Cretaceous succession of the Amasya Region (Northern Anatolia), Turkey
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Platform-slope transition during rifting: The mid-Cretaceous succession of the Amasya Region (Northern Anatolia), Turkey

机译：裂谷过程中的平台坡过渡：土耳其阿马西亚地区（北安纳托利亚）的白垩纪中期演替

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摘要

The mid-Cretaceous rocks of the Amasya region, North Central Anatolia record the geological processes that occurred during the break up of the eastern Pontide carbonate platform which existed from mid-Jurassic to Early Cretaceous. The mid-Cretaceous sedimentary rocks consists of benthic foraminiferal packstones/grainstones of Ferhatkaya Formation, and limestone breccias, turbidites, pelagic foraminiferal wackestones/packstones and radiolarites of Sarilar Formation corresponding to platform, and slope/apron environments, respectively. The lithological development of these units was controlled mainly by active subsidence due to block-faulting affecting the Eastern Pontide carbonate platform. Due to the break-up of the platform during Late Barremian-Early Aptian times, slope and basin sediments were deposited on the deeper parts of the platform. Re-deposited sediments such as limestone breccias and calciturbidites document the infilling of asymmetric grabens during the mid-Cretaceous rifting phase. Re-deposited sequences, which were formed as a fault slope-apron sedimentary prism related to this rifting, were deposited during thinning-and-fining upward megacycles. A typical megacycle commences with breccias deposited at the base of a fault-scarp association. In addition, the upper part of the platform carbonates (Ferhatkaya Formation) includes neptunian dykes composed of red mudstones with pelagic fossils, indicating a period of extension.
机译：中安纳托利亚中部北部阿马西亚地区的白垩纪中段岩石记录了从侏罗纪中期到白垩纪早期存在的东部庞帝特碳酸盐岩台地破裂过程中发生的地质过程。白垩纪中段沉积岩由Ferhatkaya组的底栖有孔虫堆积岩/粒岩，以及分别对应于平台和斜坡/围裙环境的Sarilar组的石灰岩角砾岩，浊积岩，浮游有孔虫威克石/堆积岩和放射闪石组成。这些单元的岩性发育主要受活动塌陷的控制，这是由于断层作用影响了东部庞帝碳酸盐岩台地。由于巴里米亚晚期至阿普提安晚期平台破裂，斜坡和盆地沉积物沉积在平台的较深部分。重新沉积的沉积物，例如石灰岩角砾岩和钙铁矿，记录了白垩纪中段裂谷阶段不对称grab石的充填。重新沉积的序列形成为与此裂谷有关的断层斜坡-围裙沉积棱镜，在稀疏和细化向上的大周期中沉积。一个典型的大循环始于角砾岩，沉积在断层-陡坡联合的底部。此外，台地碳酸盐岩的上部分（Ferhatkaya组）包括由红色泥岩和浮游性化石组成的海王星脉，表明其发育期。

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