埃迪卡拉系Tamengo组(corumb群)基底沉积角砾岩与构造角砾岩的对比研究

IF 1.3 4区 地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY
H. A. Fernandes, P. Boggiani, J. Afonso, K. Amorim, R. Trindade
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引用次数: 2

摘要

corumb群是位于巴西中部巴拉圭带南部的一个新元古代陆源和碳酸盐沉积岩序列。corumb群的上部单元包括Ediacaran碳酸盐岩Bocaina组和Tamengo组,其边界以从corumb到Serra da Bodoquena, Mato Grosso do Sul的几个地点发现的多角砾岩为特征。尽管角砾岩分布广泛,但对其描述甚少,起源也不确定。本研究的目的是提出沉积角砾岩与构造角砾岩的区别,并提出各自的成因模式。沉积角砾岩主要为基质支撑的混沌相,由斜坡边缘的海底块体流形成。海平面下降和/或断层速率的增加使下伏单元暴露出来,并通过形成陡坡触发重力通量。沉积角砾岩基底代表了柯仑组碳酸盐岩沉积中的一个主要不整合面,与其他埃迪卡拉系单元具有潜在的相关性。巴拉圭褶皱冲断带的后续发育导致逆断裂带构造角砾岩的形成。碎裂作用和糜棱岩化作用使白云质寄主岩石破碎变形,形成细片理基质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Sedimentary and tectonic breccias at the base of the Ediacaran Tamengo Formation (Corumbá Group): a comparative study
The Corumbá Group is a Neoproterozoic succession of terrigenous and carbonate sedimentary rocks located at the southern Paraguay Belt, central Brazil. The upper units of the Corumbá Group include the Ediacaran carbonate Bocaina and Tamengo formations, whose limit is characterized by polymictic breccias recognized in several sites from Corumbá to Serra da Bodoquena, Mato Grosso do Sul. Despite the widespread occurrence, the breccias are poorly described and their origin is uncertain. The aim of this study is to present the differences between sedimentary and tectonic breccias of the Corumbá Group and propose a genesis model for each. The sedimentary breccias comprise mainly matrix-supported chaotic facies that formed by submarine mass flows on slope aprons. Sea level fall and/or increased faulting rates exposed the underlying units and triggered the gravity fluxes by creating a steep slope. The base of the sedimentary breccia represents a major unconformity within the carbonate sedimentation of the Corumbá Group, with potential correlation to other Ediacaran units. The subsequent development of the Paraguay fold-thrust belt caused the formation of tectonic breccias in reverse fault zones. Cataclasis and mylonitization deformed the dolomitic host rock by fracturing and produced a fine foliated matrix.
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来源期刊
Brazilian Journal of Geology
Brazilian Journal of Geology GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.20
自引率
7.10%
发文量
12
审稿时长
11 weeks
期刊介绍: The Brazilian Journal of Geology (BJG) is a quarterly journal published by the Brazilian Geological Society with an electronic open access version that provides an in-ternacional medium for the publication of original scientific work of broad interest concerned with all aspects of the earth sciences in Brazil, South America, and Antarctica, in-cluding oceanic regions adjacent to these regions. The BJG publishes papers with a regional appeal and more than local significance in the fields of mineralogy, petrology, geochemistry, paleontology, sedimentology, stratigraphy, structural geology, tectonics, neotectonics, geophysics applied to geology, volcanology, metallogeny and mineral deposits, marine geology, glaciology, paleoclimatology, geochronology, biostratigraphy, engineering geology, hydrogeology, geological hazards and remote sensing, providing a niche for interdisciplinary work on regional geology and Earth history. The BJG publishes articles (including review articles), rapid communications, articles with accelerated review processes, editorials, and discussions (brief, objective and concise comments on recent papers published in BJG with replies by authors). Manuscripts must be written in English. Companion papers will not be accepted.
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