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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Stratigraphy and volcanic facies architecture of the Torres Syncline, Southern Brazil, and its role in understanding the Parana-Etendeka Continental Flood Basalt Province
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Stratigraphy and volcanic facies architecture of the Torres Syncline, Southern Brazil, and its role in understanding the Parana-Etendeka Continental Flood Basalt Province

机译：巴西南部Torres Syncline的地层和火山岩相结构及其在理解Parana-Etendeka大陆洪水玄武岩省中的作用

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The Torres Syncline is a large structure that constitutes the eastmost outcrop of the Parana-Etendeka CFB in South American side, and this work focuses the stratigraphy and facies architecture of the volcanic pile in the syncline. The volcanic sequence along the study area permits the division of three regions: main valley, intermediate zone and south hinge, each of them with distinct stratigraphy, which probably reflects the structural evolution of the syncline. The stratigraphy of the Torres Syncline is composed by: 1 - Botucatu palaeoerg; 2 - Basic volcanic episode I; 3 - Basic volcanic episode II, 4 - Acidic volcanic I, 5 - Basic volcanic episode III and 6 - Acidic volcanic episode II. The five volcanic episodes recognized in study area can be related to five volcanic facies architecture: compound-braided, tabular-classic, tabular/lobate escoriaceous, dome-field (acidic lavas) and tabular flows (acidic lavas). The basic episode I is composed by pahoehoe flows with a compound-braided facies architecture that covered the Botucatu palaeoerg. The basic episode II is a tabular-classic facies architecture predominantly composed by simple flows (10-20 m thick) reaching the total thickness of ～500 m in main valley. The acidic episode I is exposed in main valley and south hinge, and is composed by acidic lavas forming lava dome-field facies architecture with a thickness of ～150 m. The basic episode III is predominantly constituted by 'a'a flows with tabular/lobate escoriaceous facies architecture. The acidic episode II is constituted by tabular flow volcanic facies (acidic flows) and outcrops all along the study area. The Torres Syncline constitute the eastmost on-shore exposures of the Parana-Etendeka CFB in South American side and detailed stratigraphic, volcanological and structural studies in these area, coupled with correlation with Huab Basin (NW Namibia, Africa) will aim the understanding of the Gondwana breakup process and the early stages of the South Atlantic margin opening.
机译：Torres Syncline是一个大型结构，构成南美侧Parana-Etendeka CFB的最东端露头，这项工作着眼于Synline中火山桩的地层和相结构。沿研究区的火山序列允许划分三个区域：主谷，中间带和南铰链，每个区域都有不同的地层，这可能反映了向斜的结构演化。 Torres Syncline的地层由：1-Botucatu palaeoerg； 2-基本火山第一集； 3-基本火山爆发II，4-酸性火山爆发I，5-基本火山爆发III和6-酸性火山爆发II。在研究区中识别出的五个火山事件可能与五个火山相构造有关：复合辫状，板状经典，板状/叶状粘骨质，圆顶场（酸性熔岩）和板状流（酸性熔岩）。我的基本情节是由Pahoehoe流和覆盖Botucatu古生物的复合编织相构造组成的。基本情节II是一种表层-经典相结构，主要由简单的水流（10-20 m厚）组成，在主河谷中总厚度达到〜500 m。酸性集I暴露于主谷和南铰，由酸性熔岩组成，形成了约150 m厚度的熔岩穹顶-岩相相构造。基本的第三集主要由具有板状/叶状粘质相构造的“ a”流构成。酸性事件II由整个研究区的板状流火山相（酸性流）和露头组成。 Torres Syncline构成了南美侧Parana-Etendeka CFB最东端的陆上曝露，这些地区的详细地层，火山学和构造研究以及与Huab盆地（非洲纳米比亚西北部）的相关性旨在了解冈瓦纳解体过程和南大西洋边缘开放的早期阶段。

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