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首页> 外文期刊>Contributions to Mineralogy and Petrology >Mesoproterozoic rifting and Pan-African continental collision in SE India: evidence from the Khariar alkaline complex
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Mesoproterozoic rifting and Pan-African continental collision in SE India: evidence from the Khariar alkaline complex

机译：印度东南部中元古代裂谷和泛非大陆碰撞：哈里亚尔碱性复合物的证据

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摘要

The suture zone between the Bhandara craton and the granulite-facies rocks of the Eastern Ghats Province in SE India contains a number of deformed alkaline and tholeiitic intrusives. The Khariar alkaline complex is one of the several occurrences which intruded in the Mesoproterozoic (1,480 + -17 Ma, 2a) and was deformed during the Pan-African tectonothermal event. The geochemical signatures indicate a rift-related setting for the magmatic activity. The nepheline syenite parent magma may have been produced by in-mantle frac-tionation of clinopyroxene and Ti-rich amphibole from a basanitic primary magma derived from an enriched spinel lherzolite mantle source in the sub-continental lithosphere. Geochemical variations in the Khariar alkaline suite can be modeled by the fractionation of clinopyroxene, amphibole, titanite, zircon, apatite and allanite. The Mesoproterozoic alkaline magmatism at Khariar marks the initiation of a NE-SW rift which formed several craton margin basins and opened an ocean towards the south. The sediments of the crato-genic basins and the Eastern Ghats Province were deposited in these rift-related basins. A K-Ar age of 1,330 + - 53 Ma from glauconites in sandstone suggests that the NW-SE trending Godavari-Pranhita graben formed at approximately the same time as the rift at the craton margin. If the two are related, the Godavari-Pranhita graben may represent the failed arm of a rift system in which the NE-SW arm was the active segment. The granulite-facies deformation and metamorphism of the Eastern Ghats Province sediments may be related to an episode of Grenvillian basin inversion. The Mesoproterozoic rifting and Grenvillian basin closure may thus represent two well-defined parts of a Wilson cycle i.e. the opening and closure of an ocean. The Khariar and other alkaline bodies were, however, deformed during a Pan-African collisional event associated with the westward thrusting of the Eastern Ghats Province granulites over the cratonic foreland.
机译：印度东南部高止山脉省的班达拉克拉通与花岗石相岩之间的缝合带包括许多变形的碱性和生孔岩侵入体。 Khariar碱性复合物是侵入中元古代（1,480 + -17 Ma，2a）并在泛非构造热事件中变形的几种事件之一。地球化学特征表明岩浆活动与裂谷有关。霞石正长岩浆母岩可能是由次大陆岩石圈富集尖晶石水纹石地幔来源的玄武质原生岩浆中的亚基闪辉岩和富钛闪石形成的。 Khariar碱性组中的地球化学变化可以通过亚斜辉石，角闪石，钛矿，锆石，磷灰石和尿石的分馏来模拟。 Khariar中元古生代碱性岩浆作用标志着NE-SW裂谷的形成，该裂谷形成了几个克拉通边缘盆地，并向南开辟了大洋。裂谷成因盆地和东高止山脉省的沉积物沉积在这些与裂谷有关的盆地中。砂岩中的青绿岩的K-Ar年龄为1,330 +-53 Ma，这表明NW-SE趋势的Godavari-Pranhita en陷与克拉通边缘的裂谷几乎同时形成。如果两者相关，则Godavari-Pranhita抓爪可能代表裂痕系统的失效支臂，其中NE-SW支臂是活动段。东高止山脉省沉积物的花岗石相变形和变质作用可能与格伦维利盆地逆转的发生有关。中元古代裂谷和格林维尔盆地的封闭可能代表了威尔逊循环的两个明确定义的部分，即海洋的开放和封闭。然而，在与东高止山脉省花岗岩向克拉通前陆的向西推动有关的泛非碰撞事件中，哈里亚尔和其他碱性物体变形。

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