当前位置: X-MOL 学术Tectonics › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Comment on “Tectono Metamorphic Evolution of the Central Ribeira Belt, Brazil: A Case of Late Neoproterozoic Intracontinental Orogeny and Flow of Partially Molten Deep Crust During the Assembly of West by Meira et al.
Tectonics ( IF 3.3 ) Pub Date : 2020-07-11 , DOI: 10.1029/2019tc005897
Monica Heilbron 1, 2 , Claudio Morisson Valeriano 1, 2
Affiliation  

The commented article contributes with new metamorphic petrology and U‐Pb geochronology data concerning the sin‐collisional stage of two terranes (Embu and Costeiro) belonging to the southern Ribeira orogen (not Central Ribeira belt, as the title suggests), in order to propose an intracontinental evolution for the Ribeira‐Araçuaí orogenic system. Several issues regarding their review of the literature and interpretation of data should be considered in face of the proposition for an intracontinental evolution of an orogenic system that has long been considered as having developed through a Wilsonian sequence of events, involving continental rifting and ocean development, subduction and building of magmatic arc, terrane accretion, and continental collision in the context of amalgamation of Gondwana. In order to contribute to a comprehensive discussion of the tectonic evolution of the Ribeira‐Araçuaí orogenic system, we bring forward the following points that have not been properly acknowledged by the authors in their proposed tectonic scheme. Without substantial new data set and without integrating all the available age, petrologic and deformational data, there seems not to be commented enough evidence for the proposal of an intracontinental evolution for the Ribeira‐Araçuaí orogenic system. In contrary, an accretionary to collisional model is preferred because it in fact integrates all the documented tectonic features: subduction of passive São Francisco paleocontinental margin, generation of magmatic arcs with typical signatures of modern ones elsewhere in the world, three accretionary‐collisional episodes, and an episode of orogenic collapse in the Cambro‐Ordovician transition, associated to slab breakoff and upwelling of asthenosphere.

中文翻译:

评论:“巴西中里贝拉带的构造变质演化:Meira等人在西部组装期间晚新元古代陆内造山作用和部分熔融深壳流动的案例。

这篇评论文章为新的变质岩石学和U-Pb年代学数据做出了贡献,该数据涉及属于南部Ribeira造山带(如标题所示,不是Central Ribeira带)的两个地层(Embu和Costeiro)的正碰撞阶段。 Ribeira-Araçuaí造山系统的洲内演化。面对造山系统的洲内演化的主张,应该考虑一些有关文献回顾和数据解释的问题,长期以来一直认为该造山系统是通过威尔逊主义一系列事件发展而成的,涉及大陆裂谷和海洋发育,在冈瓦纳合并的背景下俯冲并形成岩浆弧,地层增生和大陆碰撞。为了有助于全面讨论里贝拉-阿拉索阿造山带系统的构造演化,我们提出了以下在作者提出的构造方案中未得到适当承认的观点。没有大量新的数据集,也没有整合所有可用的年龄,岩石学和变形数据,似乎没有评论到足够的证据来提出里贝拉-阿拉索阿造山系统的陆内演化建议。相反,应优先考虑增生模型,因为它实际上整合了所有已记录的构造特征:俯冲被动圣弗朗西斯科古大陆边缘,生成具有世界其他地方现代特征的岩浆弧,三个增生-碰撞事件,
更新日期:2020-07-11
down
wechat
bug