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Petrogenesis of the Kanker Granites From the Bastar Craton: Implications for Crustal Growth and Evolution During the Archean-Proterozoic Transition
Frontiers in Earth Science ( IF 2.0 ) Pub Date : 2020-05-20 , DOI: 10.3389/feart.2020.00212
Ajay Dev Asokan , R. Elangovan , Neeraj Vishwakarma , K. R. Hari , M. Ram Mohan

Archean-Proterozoic boundary represents a significant transitional phase in the Earth's history. Bastar Craton is one of the major Archean cratons in the Indian subcontinent with voluminous granites, supracrustal rocks, and tectonic belts. Malanjkhand, Dongargarh, and Kanker are the three major granitic plutons emplaced during the Archean-Proterozoic transition in the Bastar Craton, and this study is confined to the granites of Kanker pluton. Based on geochemical systematics, the Kanker granites are classified into sanukitoids, biotite and two-mica granites, and hybrid granites. The compositional diversity of the Kanker granites is attributed to two end-member sources, i.e., the enriched mantle and an older felsic crust, and the interactions between them. The sanukitoids were derived from an enriched mantle source that was metasomatized by the subducted sediments. Heat supplied by the sanukitoid magmas induced the crustal melting to form the biotite and two-mica granites. The interaction between these two mutually end-member sources, i.e., the enriched mantle and an older felsic crust, resulted in the formation of hybrid granites. The evolution of the Kanker granites can be accounted for a transitional geodynamic environment, involving subduction, and collisional tectonics during the Archean-Proterozoic transition.



中文翻译:

来自Bastar Craton的Kanker花岗岩的成岩作用:太古代-元古代过渡期对地壳生长和演化的影响

太古代-元古代界代表了地球历史上一个重要的过渡阶段。Bastar Craton是印度次大陆主要的太古宙克拉通之一,拥有大量的花岗岩,地壳岩石和构造带。Malanjkhand,Dongargarh和Kanker是在Bastar Craton的太古代至元古代过渡时期植入的三个主要花岗质岩体,这项研究仅限于Kanker岩体的花岗岩。根据地球化学系统,Kanker花岗岩可分为sanukitoids,黑云母和两云母花岗岩,以及杂化花岗岩。Kanker花岗岩的成分多样性归因于两个端部成员来源,即富集的地幔和较老的长英质地壳,以及它们之间的相互作用。sanukitoids来源于丰富的地幔源,该源被俯冲的沉积物交代。sanukitoid岩浆提供的热量促使地壳融化,形成了黑云母和两云母花岗岩。这两个互为末端的烃源(即富集的地幔和较旧的长英质地壳)之间的相互作用导致了杂花岗岩的形成。Kanker花岗岩的演化可以解释为过渡的地球动力学环境,包括俯冲和太古代至元古代的过渡时期的碰撞构造。导致形成了混合花岗岩。Kanker花岗岩的演化可以解释为过渡的地球动力学环境,包括俯冲和太古代至元古代的过渡时期的碰撞构造。导致形成了混合花岗岩。Kanker花岗岩的演化可以解释为过渡的地球动力学环境,包括俯冲和太古代至元古代的过渡时期的碰撞构造。

更新日期:2020-06-30
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