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The 2.26 to 2.18 Ga Arc-Related Magmatism of the Almas-Conceição do Tocantins Domain: An Early Stage of the São Francisco Paleocontinent Assembly in Central Brazil
Journal of South American Earth Sciences ( IF 1.704 ) Pub Date : 2020-07-31 , DOI: 10.1016/j.jsames.2020.102757
André Menezes Saboia, Claudinei Gouveia de Oliveira, Elton Luis Dantas, Jaime Estevão Scandolara, Pedro Cordeiro, Joseneusa Brilhante Rodrigues, Isabela Moreno Cordeiro de Sousa

Paleoproterozoic (Rhyacian) rocks dominate within the basement of the Neoproterozoic Brasília Belt and their genesis has been attributed to the orogenic amalgamation event that assembled the São Francisco-Congo paleocontinent from 2.18 to 2.07 Ga. However, the tectonic framework and genesis of the building blocks involved in this continent-wide amalgamation event are unclear, particularly in relation to terranes from the Almas-Conceição do Tocantins Domain, in the Goiás Massif, central Brazil. This work provides new whole-rock chemical and geochronological data, which indicate the generation of felsic to intermediate magmatism around 2.29 and 2.28 Ga corresponding to the Monzogranitic Unit and the Quartz-dioritic Suite, respectively. Later magmatic events occurred in a continental arc setting, around 2.26 to 2.2 Ga represented by metaluminous to peraluminous I-type magmatism of the Granodioritic to Tonalitic Suite (GTS) and the Serra do Boqueirão Suite. Around 2.2 to 2.18 Ga a peraluminous I-type magmatism took place and generated the Peraluminous Suite (PS). Our data show that after an earlier Siderian magmatic event around 2.45–2.34 Ga, reported in previous works, the Almas do Conceição do Tocantins Domain oversaw additional Rhyacian events of magmatic activity around 2.29 Ga to 2.18 Ga. Regional geotectonic correlations with the São Francisco Craton and other pericratonic belts indicate coeval magmatic events taking place during the early stages of the Columbia Supercontinent amalgamation.



中文翻译:

Almas-Conceiçãodo Tocantins域的2.26至2.18 Ga弧相关岩浆作用:巴西中部圣弗朗西斯科古大陆大会的早期阶段

古元古代(Rhyacian)岩石在新元古代巴西利亚带的基底中占主导地位,其成因归因于造山带合并事件,该事件将圣弗朗西斯科-刚果古大陆从2.18 Ga组装到2.07 Ga。但是,构造框架和构造块的成因目前尚不清楚该事件是否涉及整个大陆,特别是与巴西中部戈亚斯断层的Almas-Conceiçãodo Tocantins域中的地雷有关。这项工作提供了新的全岩石化学和年代学数据,表明在2.29和2.28 Ga左右分别发生了长岩质到中等岩浆作用,分别对应于Monzogranitic单元和Quario-dioritic套件。后来的岩浆事件发生在2.26到2左右的大陆弧环境中。2 Ga以花岗I至岩浆I型岩浆作用为代表,由花岗岩到Tonalitic Suite(GTS)和Serra doBoqueirãoSuite。大约2.2至2.18 Ga发生了I型岩浆作用,并产生了Peraluminous Suite(PS)。我们的数据显示,在先前的工作中报道过,在2.45–2.34 Ga附近发生了较早的Siderian岩浆事件之后,Almas doConceiçãodo Tocantins域观测到了大约2.29 Ga至2.18 Ga附近的其他Rhyacian岩浆活动事件。其他克拉通带则表明在哥伦比亚超大陆合并的早期阶段发生了岩浆事件。18 Ga发生了I型岩浆作用,并产生了Peraluminous Suite(PS)。我们的数据显示,在先前的工作中报道过,在2.45–2.34 Ga附近发生了较早的Siderian岩浆事件之后,Almas doConceiçãodo Tocantins域观测到了大约2.29 Ga至2.18 Ga附近的其他Rhyacian岩浆活动事件。其他克拉通带则表明在哥伦比亚超大陆合并的早期阶段发生了岩浆事件。18 Ga发生了I型岩浆作用,并产生了Peraluminous Suite(PS)。我们的数据显示,在先前的工作中报道过,在2.45–2.34 Ga附近发生了较早的Siderian岩浆事件之后,Almas doConceiçãodo Tocantins域观测到了大约2.29 Ga至2.18 Ga附近的其他Rhyacian岩浆活动事件。其他克拉通带则表明在哥伦比亚超大陆合并的早期阶段发生了岩浆事件。

更新日期:2020-07-31
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