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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The Bero Volcanic Complex: Extension of the Parana-Etendeka Igneous Province into SW Angola
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The Bero Volcanic Complex: Extension of the Parana-Etendeka Igneous Province into SW Angola

机译：贝罗火山群：将巴拉那-埃滕德卡火成岩省扩展到西南安哥拉

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An extension of the Etendeka-Parana Igneous Province into SW Angola occurs as minor basalt lavas, intrusive gabbro sheets, minor mafic dykes and thick sheets and lava flows (with minor pyroclastics) of quartz latite composition This suite crops out along the eastern margin of the Cretaceous Namibe Basin in SW Angola. The quartz latites from one locality have been referred to informally as the Giraul volcanics but the name 'Giraul' has previously been used for Cretaceous conglomerates. We propose the name Bero Volcanic Complex for this suite of intrusive and extrusive rocks on the basis that the full compositional range of this diverse suite crops out along the Rio Bero. Major and trace element compositions and Sr-, Nd-, and Pb-isotopic compositions indicate that the basalts and gabbros are equivalent to the high-Ti Khumib/Urubici and Pitanga types from the Etendeka and Parana. The basalts underlie the quartz latites which are cut by mafic dykes some of which are compositionally equivalent to the Paranapanema lavas in the Parana. Five different geochemical types of high-Ti quartz latite are recognised amongst the silicic volcanics, 3 of which have very close geochemical affinities to the Ventura, Sarusas, and Khoraseb types of the northern Etendeka. Their relative stratigraphic position in the Bero volcanic sequence is the same as in the Etendeka sequence and extend significantly the area over which these types were erupted. The two remaining types, Chinguau and High-Nb are not known from either the Etendeka or the Parana provinces. (C) 2016 Elsevier B.V. All rights reserved.
机译：Etendeka-Parana火成岩省扩展到安哥拉西南部时，发生了玄武岩熔岩，侵入性辉长岩片，较小的铁镁质岩堤和厚板岩以及石英岩组成的熔岩流（含少量火成碎屑）。安哥拉西南部白垩纪纳米贝盆地。来自一个地方的石英岩被非正式地称为Giraul火山岩，但是“ Giraul”这个名字以前曾用于白垩纪砾岩。我们建议将这种侵入性和挤压性岩石组合命名为“ Bero火山综合体”，原因是该多样化组合的整个成分范围都沿着Rio Bero种植。主要和微量元素组成以及Sr，Nd和Pb同位素组成表明，玄武岩和辉长岩等同于Etendeka和Parana的高Ti Khumib / Urubici和Pitanga类型。玄武岩位于石英岩的下方，石英岩由铁镁质岩脉切割而成，其中某些岩性与巴拉那州的巴拉那帕内玛熔岩相同。硅质火山岩中公认有五种不同的地球化学类型的高钛石英花岗石，其中三种与埃滕德卡北部的文图拉，萨鲁萨斯和科拉塞布类型具有非常接近的地球化学亲和力。它们在Bero火山层序中的相对地层位置与Etendeka序列中的相对地层位置相同，并且显着扩展了这些类型喷发的区域。埃滕德卡省或巴拉那州尚不知道其余的两种类型，Chinguau和High-Nb。 （C）2016 Elsevier B.V.保留所有权利。

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