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The Antimonio ramp in Sonora, Mexico

机译：墨西哥索诺拉的antimonio舷梯

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The Upper Permian to Lower Jurassic El Antimonio Group has been considered as part of the NW-SE-trending tectonostratigraphic Antimonio terrane in Sonora, Mexico. The Upper Triassic Rio Asuncion Formation of the El Antimonio Group comprises a shallow-marine detrital-carbonate succession at three major localities near Caborca and Hermosillo. Previous reconstructions have proposed differing depositional environments for the Rio Asuncion Formation (e.g., carbonate platform, carbonate ramp) and remained therefore nonconsensual. The present study has its focus on the Rio Asuncion Formation and includes the analyses of 129 thin-sections of carbonate and mixed siliciclastic-carbonate rocks from three localities (Barra los Tanques, Sierra del Alamo, and Sierra Santa Teresa). In Sierra del Alamo, ammonite findings allowed us to confirm the position of the Triassic-Jurassic boundary. Considering the lack of biostratigraphic markers and the clastic nature of the samples, a statistical approach was used to propose a depositional model that can provide more detailed insights into this sedimentary succession. Hierarchical cluster analyses were performed on the gathered abundance data to identify microfacies and to compare the results for each outcrop. Through these analyses, 22 microfacies were defined, which describe the depositional environments of the two main localities. Furthermore, it could be demonstrated through this approach that not only the localities of Barra los Tanques and Sierra del Alamo but also the outcrops near Sierra Santa Teresa belong to the Antimonio depositional system. To gain insights into the relative depositional conditions among the microfacies, non-metric multidimensional scaling was performed. The resulting trends of water energy and proximity to the shoreline of Laurentia were then used to propose a depositional model for the mixed siliciclastic-carbonate Antimonio ramp system.
机译：下二叠纪为降低侏罗纪EL antimonio集团被认为是墨西哥索诺拉的NW-SE趋势构造图案antimonio Terrane的一部分。 El Antimonio组的上三叠系Rio亚胺形成在Caborca和Hermosillo附近的三个主要地区，包括浅海洋碎屑 - 碳酸酯连续。以前的重建已经提出了用于RIO亚胺形成的不同沉积环境（例如，碳酸盐平台，碳酸盐坡道），因此仍然是非可呼吸的。本研究重点关注RIO亚胺形成，包括从三个地方（Barra Los Tanques，Sierra del Alamo和Sierra Santa Teresa）的129种碳酸酯和混合硅淤泥岩石的分析。在塞拉德·艾拉莫，允许我们确认三叠系侏罗纪边界的位置。考虑到生物数据库标记的缺乏和样品的碎屑性质，统计方法用于提出沉积模型，可以提供更详细的沉积连续洞察。在聚集的丰富数据上执行分层聚类分析以识别微缩醛，并比较每个露头的结果。通过这些分析，定义了22个微量面积，描述了两个主要地区的沉积环境。此外，可以通过这种方法证明，不仅是巴拉洛斯·塔克基和塞拉德尔阿拉莫的地方，而且还可以是塞拉斯塔特萨附近的露头属于锑沉积系统。为了进入微缩放中的相对沉积条件的见解，进行非公制多维缩放。然后，使用所得到的水能和邻近劳伦西亚海岸线的趋势，提出混合硅硅酸盐锑坡道系统的沉积模型。

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