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首页> 外文期刊>Facies >Episodic sedimentation on a peri-Tethyan ridge through the Middle-Late Jurassic transition (Villny Mountains,southern Hungary)
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Episodic sedimentation on a peri-Tethyan ridge through the Middle-Late Jurassic transition (Villny Mountains,southern Hungary)

机译：中侏罗世过渡时期（特里山脉，匈牙利南部）在特提斯洋脊上的阵发性沉积

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The Villány area, as a central part of the Tisza microcontinent/terrane along the European margin of Tethys, was characterized by intense subsidence in th Early and Middle Triassic, followed by a long interruption of subsidence in the Late Triassic to Middle Jurassic. During the Middle-Late Jurassic transition, marine sedi-mentation started with three distinct sedimentary episodes dated as Late Bathonian, Early Callovian, and Middle-Late Callovian, respectively. The succession is terminated by a thick limestone of Middle Oxfordian age. The sedimentary features, microfacies, and macroinvertebrate associations of these four stratigraphic units are documented and illus-trated. The Middle to Late Jurassic sedimentary episodes of the Villány succession record an interplay of local and global factors and paleogeographical changes. At the beginning, local tectonic movements governed the main features of sedimentation, though the role of eustasy was also essential. From the mid-Callovian onwards, global climatic, biotic, and paleoceanographical changes controlled the nature and formation of the local carbonate sediments. The Callovian stromatolites are attributed to the activity of sulphate-reducing bacteria in a deep sublittoral,current-swept environment. Upwelling of eutrophic Tethyan waters is recorded by the prevalence of the Bositra filament microfacies in the Callovian. The long submarine hiatus at around the Callovian-Oxfordian transition mirrors a serious restriction of the carbonate budget, due to sudden cooling and a change in the oceanic current system(opening of a circumglobal Tethyan Passage), and to a higher amount of dissolved CO2. In the Middle Oxfordian, the carbonate production considerably increased in accordance with the sudden global warming.
机译：Villány地区是蒂瑟斯欧洲边缘的Tisza微洲/地心的中部地区，其特征是早三叠世和中三叠世强烈下沉，随后是三叠纪晚期至中侏罗世的长期沉陷中断。在中晚期侏罗纪过渡时期，海洋沉积开始于三个不同的沉积时期，分别为晚巴东期，早期卡洛夫期和中晚期卡洛夫期。继承被中牛津时期的厚厚石灰岩终止。这四个地层单元的沉积特征，微相和大型无脊椎动物的联系都得到了记录和说明。 Villány演替的中侏罗纪至晚侏罗纪沉积事件记录了局部和全球因素与古地理变化的相互作用。刚开始时，局部构造运动控制着沉积的主要特征，尽管摇头丸的作用也很重要。从卡洛维中期开始，全球气候，生物和古海洋学变化控制了局部碳酸盐沉积物的性质和形成。 Callovian叠层石归因于深层近海，电流扫掠环境中硫酸盐还原细菌的活性。富营养性的特提斯（Tethyan）水域的上升沿被卡洛维期的Bositra细丝微相的普遍程度所记录。由于突然降温和洋流系统的变化（环绕全球的特提斯通道的开放）以及大量溶解的二氧化碳，在卡洛夫-牛津过渡带周围长的海底裂隙反映出碳酸盐预算的严重限制。在牛津中部，由于全球突然变暖，碳酸盐产量大大增加。

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