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首页> 外文OA文献 >Integrated Ladinian bio-chronostratigraphy and geochrononology of Monte San Giorgio (Southern Alps, Switzerland)
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Integrated Ladinian bio-chronostratigraphy and geochrononology of Monte San Giorgio (Southern Alps, Switzerland)

机译：monte san Giorgio（瑞士南阿尔卑斯山）的综合Ladinian生物年代地层学和地质年代学

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New biostratigraphic data significantly improve the age assignment of the Ladinian succession of Monte San Giorgio (UNESCO World Heritage List site, Southern Alps, Switzerland), whose world-famous fossil marine vertebrate faunas are now dated to the substage and zone levels. High-resolution single-zircon U–Pb dating was performed using ID-TIMS and chemical abrasion (CA) pre-treatment technique on volcanic ash layers intercalated in the biostratigraphically-defined intervals of the Meride Limestone. It yielded ages of 241.07 ± 0.13 Ma (Cava superiore beds, P. gredleri Zone), 240.63 ± 0.13 Ma (Cassina beds, P gredleri/P. archelaus transition Zone) and 239.51 ± 0.15 Ma (Lower Kalkschieferzone, P. archelaus Zone). Our results suggest that the time interval including the vertebrate-bearing Middle Triassic section spans around 4 Myr and is thus significantly shorter than so far assumed. The San Giorgio Dolomite and the Meride Limestone correlate with intervals of the Buchenstein Formation and the Wengen Formation in the reference section at Bagolino, where the Global boundary Stratotype Section and Point (GSSP) for the base of the Ladinian was defined. The new radio-isotopic ages of the Meride Limestone are up to 2 Myr older than those published for the biostratigraphically-equivalent intervals at Bagolino but they are consistent with the recent re-dating of the underlying Besano Formation, also performed using the CA technique. Average sedimentation rates at Monte San Giorgio are by more than an order of magnitude higher compared to those assumed for the Buchenstein Formation, which formed under sediment-starved pelagic conditions, and reflect prevailing high subsidence and high carbonate mud supply from the adjoining Salvatore/Esino platforms. Finally, the high-resolution U–Pb ages allow a correlation of the vertebrate faunas of the Cava superiore/Cava inferiore beds with the marine vertebrate record of the Prosanto Formation (Upper Austroalpine), so far precluded by the poor biostratigraphic control of the latter.
机译：新的生物地层学数据显着改善了蒙特圣乔治（瑞士世界遗产名录站点，瑞士南阿尔卑斯山）的拉丁裔继承的年龄分配，其世界著名的化石海洋脊椎动物区系现已确定为亚阶段和区域水平。使用ID-TIMS和化学磨蚀（CA）预处理技术对插在Meride石灰岩生物地层学定义区间中的火山灰层进行了高分辨率单锆石U-Pb测年。它产生的年龄为241.07±0.13 Ma（上卡瓦河床，格雷德里区），240.63±0.13 Ma（卡西纳床，P格雷德里/ P。archelaus过渡区）和239.51±0.15 Ma（下加尔克斯基弗带，P. archelaus区）。 。我们的结果表明，包括有脊椎动物的中三叠纪剖面在内的时间间隔大约为4 Myr，因此比目前设想的要短得多。 San Giorgio白云岩和Meride灰岩与Bagolino参考剖面中的Buchenstein组和Wengen组的间隔相关，在其中定义了拉迪尼亚基底的全球边界层状剖面和点（GSSP）。 Meride石灰岩的新放射性同位素年龄比在Bagolino的生物地层等效间隔公布的年龄高2 Myr，但它们与最近使用CA技术进行的Besano地层重新定年相符。与在贫瘠的中上层条件下形成的布痕斯坦组的假设相比，蒙特圣乔治的平均沉积速率高出一个数量级以上，反映出临近的萨尔瓦托/埃西诺地区普遍存在高沉降和高碳酸盐泥供应。平台。最后，高分辨率的U–Pb年龄使上层Cava /下层Cava底栖动物的脊椎动物区系与Prosanto地层（上奥土阿尔平）的海洋脊椎动物记录相关联，迄今为止，后者的生物地层控制差。

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