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首页> 外文期刊>Geochemistry, geophysics, geosystems >Early diagenetic greigite as an indicator of paleosalinity changes in the middle Miocene Paratethys Sea of central Europe
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Early diagenetic greigite as an indicator of paleosalinity changes in the middle Miocene Paratethys Sea of central Europe

机译：早期成岩型Greigite作为中部内部内部内部中部的古乳剂质变化的指标

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摘要

The Miocene epicontinental Paratethys Sea of central Eurasia has experienced multiple restriction and reconnection events to the open ocean. Magnetostratigraphy is an important dating tool to better understand the temporal and spatial paleoenvironmental variations associated with these changes. Magnetostratigraphy in the Paratethys domain, however, is complicated by the presence of greigite (Fe3S4). Here we report rock magnetic and X-ray fluorescence data of the Tisa section (Romania) which was previously magnetostratigraphically dated at the middle Miocene (base at 12.8 Ma and top at 12.2 Ma). This section comprises the Badenian Sarmatian Extinction Event (BSEE), which is marked by a major salinity change from marine to brackish environments, related to the opening of the connection between the Central and the Eastern Paratethys basins. In the marine Badenian sediments below the BSEE, the pyritization process is shown to be complete because of abundant sulfate supply. In the brackish Sarmatian deposits, four intervals with early diagenetic greigite are observed, and linked to insufficient sulfate in the water column. These four greigite intervals appear to correspond to maxima in the approximate to 100 kyr eccentricity cycle. We propose that increased fresh water from the Eastern Paratethys basin during eccentricity maxima restricted the sulfate availability in the Tisa area, leading to a reduced HS- production and enhanced greigite preservation. The early diagenetic formation of greigite enables a quasi syn-depositional recording of the paleomagnetic field, which allows reliable paleomagnetic dating in this section. Our results further suggest greigite as a potential indicator for salinity changes during marine/brackish transitions.
机译：欧洲中西亚中西部的中肾上腺素帕拉特斯米普拉斯海洋对开阔的海洋经历了多种限制和重新联系活动。磁通数据是一个重要的约会工具，以更好地了解与这些变化相关的时间和空间古环境变化。然而，ParateSthys结构域中的磁性数据通过Greigite（Fe3S4）的存在复杂。在这里，我们报告了TISA部分（罗马尼亚）的岩石磁性和X射线荧光数据，其先前在中间细胞（12.8 mA和12.2 mA的12.8 mA和顶部的碱基）上进行了磁性分层。本部分包括贝尼亚·萨尔马士灭绝事件（BSEE），其标志着从海洋到咸水环境的主要盐度变化，与中央和东部帕拉特斯盆地之间的联系开放有关。在BSEE下面的海洋Badenian沉积物中，由于丰富的硫酸盐供应，蒸馏过程被证明是完整的。在咸水沉积物中，观察到具有早期成岩石的四间隔，并与水柱中的硫酸不足。这四个Greigite间隔似乎对应于近似100kyr偏心循环的最大值。我们提出从偏心率最大的东部帕拉特米盆盆地增加了淡水，限制了TISA区域的硫酸盐可用性，导致HS-生产和增强的GReigite保存。 Greigite的早期成岩形成使得古磁场的准同步记录能够在本节中允许可靠的古磁性测定。我们的结果进一步推出Greigite作为海洋/咸水过渡期间盐度变化的潜在指标。

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