Paleoenvironmental interpretations of outcrops of the Capianga Member in the Jatobá Basin: petrographic and micropaleontological aspects
DOI:
https://doi.org/10.11606/issn.2316-9095.v24-211617Keywords:
Carbonate, Evaporitic rocks, Limnic ostracods, Capianga Member, Aliança Formation, Jatobá BasinAbstract
The Capianga Member, upper unit of the Aliança Formation, is a succession of pelitic rocks with subordinate carbonate layers from the Upper Jurassic, which records the flooding of the Afro-Brazilian Depression by an extensive lake, but not very deep. As in other Brazilian and African passive margin basins and in aborted continental rifts associated with the extensional events that gave rise to the South Atlantic Ocean, lacustrine deposits mark the Rift Initiation Sequence and are directly associated with the incipient tectonics of these events. These deposits bring together a very characteristic lithology that communicates a lot about the paleoenvironment, in addition to a very relevant faunal assemblage of ostracods. These micro-crustaceans are recognized for their sensitivity to variations in the physicochemical characteristics of the environment in which they live, which makes them excellent paleoenvironmental indicators and therefore widely applied for this purpose. This study presents faciological, petrographic and micropaleontological analyzes of carbonate layers from samples taken from outcrops in the municipalities of Ibimirim and Tacaratu, Pernambuco; northeastern and southern portions of the Jatobá Basin, respectively. The samples were prepared according to standard laboratory techniques for the study of ostracods and used to make thin sections for petrographic classification. Here are reported two ostracods taxa: Theriosynoecum pricei and Alicenula sp. in the studied outcrops and a quantitative analysis of these genera between levels of each locality. The dominance of one genus (Theriosynoecum) to the detriment of another (Alicenula), and variations in the thickness of the evaporitic rock layers in the regions, show that in the southern portion the lake reached greater depths and concentrated more salt during periods of evaporation.
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