Integrated stratigraphy of the Upper Hauterivian to Lower Barremian Agua de la Mula Member of the Agrio Formation, Neuquén Basin, Argentina
Integrated stratigraphy of the Upper Hauterivian to Lower Barremian Agua de la Mula Member of the Agrio Formation, Neuquén Basin, Argentina
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阿根廷内乌肯盆地阿格里奥组上欧特里维安至下巴雷姆亚阿瓜德拉穆拉段的综合地层学
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发表时间：
2011
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通讯作者：
H. Leanza
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作者：
F. Archuby;M. Wilmsen;H. Leanza
应用综合地层学方法和相分析，研究了阿根廷内乌肯盆地阿格里奥组的上奥特里维安-下巴雷姆统阿瓜德拉穆拉段。在逐层采集的基础上，完善了该段菊石生物地层。已经确定的生物带（Spitidiscus riccardii、Crioceratites schlagintweiti、Crioceratites diamantensis和Paraspiticeras groeberi）被确认，与演替精确相关，并提出了进一步的细化。通过堆叠的饥饿/稀释（S/D）序列构建不同阶的序列，在此将其视为具有仅两个可以明确区分的分量的六阶序列：下饥饿半序列和上稀释半序列。层序地层学分析结果表明，该段可划分为4个主要的沉积层序（dsAM-1 ~ dsAM-4）和多个次级层序。以前出版的内乌肯盆地层序地层图没有将沉积层序与生物带联系起来，因此不能与这里介绍的方案和其他图表进行比较。我们的研究表明，与欧洲盆地的层序-年代地层方案有很好的一致性，因此，主张主张在晚Hauterivian到早Barremian期间，主要是海平面升降控制层序的发展。最新的早期Barremian年龄提出了几乎菊石贫瘠的上部的阿格里奥组，根据层序边界的相关性。
the Upper Hauterivian to Lower Barremian Agua de la Mula Member of the Agrio Formation (Neuquen Basin, Argentina) was studied applying an integrated stratigraphic approach and facies analysis. the ammonite biostratigraphy of the member has been improved based on bed-by-bed collecting. the already defined biozones ( Spitidiscus riccardii , Crioceratites schlagintweiti , Crioceratites diamantensis and Paraspiticeras groeberi ) were recognized, precisely related to the succession, and further refinement was proposed. sequences of different order are built by stacked starvation/dilution (s/d) sequences, regarded here as sixth-order sequences with only two components that can be unequivocally distinguished: the lower starvation hemisequence and the upper dilution hemisequence. Pro- and retrogradational stacking pattern of s/d sequences define supra-ordinate sequences. the sequence-stratigraphic analysis resulted in the subdivision of the member into four main depositional sequences (dsAM-1 to -4) and several subordinate sequences. Previously published sequence stratigraphic charts of the Neuquen Basin did not relate sedimentary sequences to biozones, and are hence not comparable to the scheme presented here and other charts. our study shows a good agreement with the sequence-chronostratigraphic scheme of european basins, thus arguing in favour of a predominantly eustatic control on sequence development during the Late Hauterivian to early Barremian. A latest early Barremian age is proposed for the almost ammonite-barren upper part of the Agrio Formation, based on correlations of sequence boundaries.