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Upper Katian (Upper Ordovician) trans-Atlantic δ13 C chemostratigraphy: the geochronological equivalence of the ELKHORN and PAROVEJA excursions and its implications
Lethaia ( IF 1.5 ) Pub Date : 2020-04-01 , DOI: 10.1111/let.12351
Stig M. Bergström 1 , Mark Kleffner 2 , Mats E. Eriksson 3
Affiliation  

Since 2010 when the North American ELKHORN and Baltoscandic PAROVEJA isotope excursions were first described and named, their mutual age relations have remained uncertain, if not controversial. This was at least partly due to the incompleteness of the ELKHORN excursion in its reference section in western Ohio. The unexpected discovery of an apparently complete ELKHORN excursion in a drill core from St Marys in western Ohio has led to the conclusion that in terms of stratigraphical position and δ13C curve correspondence, the ELKHORN and PAROVEJA excursions are so similar that they apparently represent the same isotopic curve perturbation. The ELKHORN/PAROVEJA excursion occurs in the D. pacificus Graptolite Zone and uppermost A. ordovicicus Conodont Zone in the uppermost Katian Stage (Stage Slice Ka4 of Bergstrom et al. Lethaia 42, 97–197, 2009). Because the designation PAROVEJA was published two months before that of ELKHORN, it has priority as excursion designation. This excursion is particularly well represented in the carbonate successions in the Great Basin of western United States. Chemostratigraphy and biostratigraphy in that region show that the Richmondian transgression was contemporaneous with the beginning of the middle Katian WHITEWATER/MOE excursion. The onset of the Richmondian transgression has long been controversial but now available evidence suggests that it is of essentially the same age across large regions of the southern, western and central United States. (Less)

中文翻译:

上卡蒂安(上奥陶纪)跨大西洋 δ13 C 化学地层学:ELKHORN 和 PAROVEJA 远足的地质年代学等价性及其影响

自 2010 年首次描述和命名北美 ELKHORN 和波托斯堪的 PAROVEJA 同位素游览以来,他们之间的年龄关系即使没有争议,也一直不确定。这至少部分是由于 ELKHORN 游览在俄亥俄州西部的参考部分不完整。在俄亥俄州西部 St Marys 的一个钻芯中意外发现明显完整的 ELKHORN 偏移,得出的结论是,就地层位置和 δ13C 曲线对应而言,ELKHORN 和 PAROVEJA 偏移非常相似,以至于它们显然代表了相同的同位素曲线扰动。ELKHORN/PAROVEJA 偏移发生在 D. pacificus 笔石带和最上端的 Katian 阶段的 A. ordovicicus 牙形石带(Bergstrom 等人的阶段 Slice Ka4,Lethaia 42, 97–197, 2009)。由于 PAROVEJA 的名称比 ELKHORN 的名称早两个月发布,因此它作为游览名称具有优先权。这种偏移在美国西部大盆地的碳酸盐岩系列中表现得尤为突出。该地区的化学地层学和生物地层学表明,里士满海侵与中卡蒂安白水/MOE 漂移的开始同时期。里士满海侵的开始长期以来一直存在争议,但现在可用的证据表明,它在美国南部、西部和中部的大片地区的年代基本相同。(较少的)这种偏移在美国西部大盆地的碳酸盐岩系列中表现得尤为突出。该地区的化学地层学和生物地层学表明,里士满海侵与中卡蒂安白水/MOE 漂移的开始同时期。里士满海侵的开始长期以来一直存在争议,但现在可用的证据表明,它在美国南部、西部和中部的大片地区的年代基本相同。(较少的)这种偏移在美国西部大盆地的碳酸盐岩系列中表现得尤为突出。该地区的化学地层学和生物地层学表明,里士满海侵与中卡蒂安白水/MOE 漂移的开始同时期。里士满海侵的开始长期以来一直存在争议,但现在可用的证据表明,它在美国南部、西部和中部的大片地区的年代基本相同。(较少的)里士满海侵的开始长期以来一直存在争议,但现在可用的证据表明,它在美国南部、西部和中部的大片地区的年代基本相同。(较少的)里士满海侵的开始长期以来一直存在争议,但现在可用的证据表明,它在美国南部、西部和中部的大片地区的年代基本相同。(较少的)
更新日期:2020-04-01
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