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首页> 外文期刊>Cretaceous Research >Palynology of the Morro do Chaves Formation (Lower Cretaceous), Sergipe Alagoas Basin, NE Brazil: Paleoenvironmental implications for?the early history of the South Atlantic
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Palynology of the Morro do Chaves Formation (Lower Cretaceous), Sergipe Alagoas Basin, NE Brazil: Paleoenvironmental implications for?the early history of the South Atlantic

机译：Morro的斑族族野外组织形成（下白垩纪），Sergipe Alagoas Basin，Ne Brazil：古环境影响？南大西洋的早期历史

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摘要

The break-up of Gondwana and the origin of related source rocks and reservoir intervals of the Brazilian coastal basins are being increasingly studied in the last decades. In this context the Sergipe-Alagoas Basin, which lies to the north of the Campos Basin hydrocarbon province, becomes relevant for the completeness of its depositional sequences. This paper presents, for the first time, the detailed palynological record from the Morro do Chaves Formation, located at the InterCement Quarry, near S?o Miguel dos Campos, Alagoas. The analysis of samples from the mudstone intervals of the unit mainly composed by coquinas has enabled new biostratigraphic, paleoenvironmental and paleogeographic interpretations of the evolution of the South Atlantic. The occurrence of the speciesDicheiropollis etruscus, with a vertical distribution ranging from the Berriasian to the Barremian, supports the late Barremian age for the lowermost part of the Morro do Chaves Formation, traditionally interpreted as having been deposited in a lacustrine environment, close to herbaceous plants, surrounded by remote mountainous areas with arboreal vegetation. The occurrence of algae phycomata of the Class Prasinophyceae, associated withScenedesmusandBotryoccocus, organisms that tolerate some salinity in its uppermost part, together with other biotic and abiotic data, corroborate the possibility of relating the Morro do Chaves Formation to a marine and/or brackish depositional environment, which may have resulted from a marine flooding in the northern sector of the Sergipe-Alagoas Basin during Early Cretaceous times. The results of this work support a paleogeographic model characterized by an episodic input of Tethyan waters towards the north of the South American continent.
机译：在过去的几十年里，越来越多地研究了Gondwana的分解和巴西沿海盆地的相关源岩石和水库间隔。在这种情况下，Sergipe-Alagoas盆地位于坎波斯盆地碳氢化合物省的北部，与其沉积序列的完整性相关。本文首次呈现来自Morro的详细的腭术记录，位于Qualry的Chaves Chormation，靠近S？O Miguel DoS Campos，Alagoas。来自Coquinas主要组成的单位的泥岩间隔的样本分析已经使新的生物学，古环境和古地理解释的南大西洋的演变。 Speciesdicheiropollis etruscus的出现，垂直分布从Berriasian到Barremian，支持莫罗的最低部位的后期巴拉姆，传统上被解释为已经在湖泊环境中沉积，接近草本植物，周围环绕着具有树栖植被的远程山区。普通植物藻类藻类的发生，与索辛段和非生物数据中耐受一些盐度的生物，与其他生物和非生物数据一起，使莫罗与海洋和/或咸沉积沉积环境相关的可能性。 ，这可能是在早期白垩纪时期北部北部部门的海洋洪水引起的。这项工作的结果支持一个古地理模型，其特征，其特征在于朝南南美洲大陆北部的Tethyan Waters的情节输入。

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