Katian (Upper Ordovician) delta C-13 chemostratigraphy and sequence stratigraphy in the United States and Baltoscandia: A regional comparison
Katian (Upper Ordovician) delta C-13 chemostratigraphy and sequence stratigraphy in the United States and Baltoscandia: A regional comparison
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DOI：
10.1016/j.palaeo.2010.02.035
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发表时间：
2010-10
期刊：
影响因子：
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通讯作者：
S. M. Bergström;Seth A. Young;B. Schmitz
中科院分区：
文献类型：
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作者：
S. M. Bergström;Seth A. Young;B. Schmitz
来自俄克拉荷马州和上密西西比河谷Katian（上奥陶统）层序的大量石灰岩样品的δ C-13值证明，在俄亥俄州的辛辛那提地区的中下部Katian层段中，至少存在四个正偏移。肯塔基州和印第安纳州。与爱沙尼亚的比较表明，通过辛辛那提地区的卡蒂安继承，现在记录的六个正偏移中有五个出现在爱沙尼亚的同时代地层间隔中，这表明，这些代表全球扰动的碳循环洪水事件和三角洲C-13次偏移表明，只有一些偏移发生在海侵层段，而其他偏移则发生在海退层段，因此，这与正碳同位素偏移是由于海平面上升而被迫的观点相冲突。大西洋相关性与生物地层学和化学地层学严重不同步。在辛辛那提地区识别的几个层序在爱沙尼亚似乎没有对应的层序，这表明它们并不反映海平面变化，而是反映当地的条件（C）2010爱思唯尔B V保留所有权利。
delta C-13 values of numerous limestone samples from Katian (Upper Ordovician) successions in Oklahoma and the Upper Mississippi Valley document the presence of at least three of the four positive excursions that have been recognized in the lower-middle Katian interval in the Cincinnati region in Ohio. Kentucky, and Indiana. A comparison with Estonia reveals that five out of the six positive excursions now recorded through the Katian succession in the Cincinnati region are present in the coeval stratigraphic intervals in Estonia, which suggests that these represent global perturbations in the carbon cycle A study of the relations between flooding events and delta C-13 excursions shows that only some of the excursions occur in transgressive intervals whereas other excursions are in regressive strata and hence, this is in conflict with the idea that positive carbon isotope excursions are forced by rises in sea level Part of a previously published attempt to use Upper Ordovician sequence stratigraphy for trans-Atlantic correlation is shown to be seriously out of phase with the biostratigraphy and chemostratigraphy Several of the sequences recognized in the Cincinnati region do not appear to have counterparts in Estonia, which suggests that they do not reflect eustatic, but local, conditions (C) 2010 Elsevier B V All rights reserved.