干旱区生态环境知识资源中心(Arid): Facies analysis, petrography, and palynology of the Pirara Formation (Upper Jurassic-Lower Cretaceous)-Tacutu Basin (Roraima, Brazil)

Arid

DOI	10.1016/j.jsames.2021.103574
	Facies analysis, petrography, and palynology of the Pirara Formation (Upper Jurassic-Lower Cretaceous)-Tacutu Basin (Roraima, Brazil)
	Castro, Raissa; Giorgioni, Martino; de Souza, Vladimir; Ramos, Moeme; Feitoza, Lorena Malta; Dino, Rodolfo; Antonioli, Luzia
通讯作者	Castro, R (corresponding author), Univ Brasilia UnB, Inst Geociencias, Campus Univ Darcy Ribeiro, BR-70910900 Brasilia, DF, Brazil.
来源期刊	JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
ISSN	0895-9811
EISSN	1873-0647
出版年	2021
卷号	112
英文摘要	The Tacutu Basin formed from the rifts system that occurred in the Caribbean region during the Mesozoic and culminated with in the opening of the North Atlantic Ocean. It evolved as a half-graben inserted in the Guiana Shield north of the Amazonian Craton. The Pirara Formation corresponds to the rift phase of the evolution of this basin, however the studies characterizing this unit are very scarce and little accurate due to the absence of outcrops. Therefore, there is much debate about the origin and depositional environment of the Pirara Formation, as some authors argue that the basin was episodically connected to the sea during the rifting, whereas others claim that was a continental-lacustrine environment, under arid to semi-arid climatic conditions. This work was based on investigations carried out on recently drilled rock cores of the Pirara Formation, which provides substantial new information regarding lithological and sedimentological data. The main objective was to characterize the lithofacies petrography palynofacies and constrains the paleoenvironmental interpretation of this unit. Three main lithofacies were identified: marlstone, siltstone, and black shale, with the latter yielding TOC content between 5% and 13.7% and organic matter consisting of phytoclasts, palynomorphs, and amorphous particles. Highly hypersaline conditions are indicated by the presence of pseudomorphs of evaporitic minerals, occurring in the marlstone and siltstone facies. Conversely no marine components take place in the palynological assemblages. The results demonstrate that the Pirara Formation represents a playa lake environment that evolved in the Southern Caribbean region in the Late Jurassic-Early Cretaceous during the opening of the Central Atlantic Ocean.
英文关键词	Mesozoic Rift Palynomorphs TOC Playa lake
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000708233600001
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/364036
作者单位	[Castro, Raissa; Giorgioni, Martino] Univ Brasilia UnB, Inst Geociencias, Campus Univ Darcy Ribeiro, BR-70910900 Brasilia, DF, Brazil; [de Souza, Vladimir; Ramos, Moeme; Feitoza, Lorena Malta] Univ Fed Roraima UFRR, Inst Geociencias, Rua A Ene Garces 2913, BR-69310000 Boa Vista, Parana, Brazil; [Dino, Rodolfo; Antonioli, Luzia] Univ Estado Rio de Janeiro UERJ, Fac Geol, Rua Sao Franscisco Xavier 524, BR-20550013 Rio De Janeiro, RJ, Brazil
推荐引用方式 GB/T 7714	Castro, Raissa,Giorgioni, Martino,de Souza, Vladimir,et al. Facies analysis, petrography, and palynology of the Pirara Formation (Upper Jurassic-Lower Cretaceous)-Tacutu Basin (Roraima, Brazil)[J],2021,112.
APA	Castro, Raissa.,Giorgioni, Martino.,de Souza, Vladimir.,Ramos, Moeme.,Feitoza, Lorena Malta.,...&Antonioli, Luzia.(2021).Facies analysis, petrography, and palynology of the Pirara Formation (Upper Jurassic-Lower Cretaceous)-Tacutu Basin (Roraima, Brazil).JOURNAL OF SOUTH AMERICAN EARTH SCIENCES,112.
MLA	Castro, Raissa,et al."Facies analysis, petrography, and palynology of the Pirara Formation (Upper Jurassic-Lower Cretaceous)-Tacutu Basin (Roraima, Brazil)".JOURNAL OF SOUTH AMERICAN EARTH SCIENCES 112(2021).