Geochemistry of the Fhyllites of the Copper Mountain Region, Sandur Schist Belt, Karnatafca

B. Krishna Rao; M. Hanuma Prasad

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Geochemistry of the Fhyllites of the Copper Mountain Region, Sandur Schist Belt, Karnatafca

机译：卡纳塔夫卡州桑杜尔岩长岩带铜山区闪长岩的地球化学

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Chemical composition of the phyllites of the Copper Mountain region of the late Archaean Sandur Schist belt in the eastern block of the Dharwar cralon indicates that the fine-grained clastic sediments from which they were formed, were derived from a provenance comprising -60% felsic, -30% mafic and -10% ultramafic rocks. High Zr/Nb and Zr/Y ratios and lack of strong -ve Eu anomalies suggest that the felsic component of the provenance was dominantly made up of tonalites-yrondivjemites; granites and grariodiorites were very subordinate constituents. The sediments appear to have accumu-lated in a continental island arc environment. Rarity of granitic constituents in the pre-Dharwar provenance of Sandur basin contrasts with the abundance of such constituents in the provenance for the fine-grained clastic sediments of basins in the western block of the Dharwar craton. The continental crust of ihe eastern block was apparently less evolved during/the pre-Dharwar time as compared to that in thewestern block of the Dharwar craton.

机译：Dharwar cralon东部地块的Archaean Sandur Schist带晚期的铜山地区的页岩的化学成分表明，形成它们的细粒碎屑沉积物是由-60％的长英质物源形成的， -30％的镁铁质岩石和-10％的超镁铁质岩石。高的Zr / Nb和Zr / Y比值以及缺乏强烈的-ve Eu异常现象表明，物源的长英质成分主要由同质色菱铁矿组成。花岗岩和绢闪石是非常重要的组成部分。沉积物似乎在大陆岛弧形环境中积累。达杜尔前克拉通盆地西部地区的达特尔盆地前达拉斯地源的花岗岩成分稀少，而这些成分的丰富与之形成对比。与达瓦尔克拉通的西部地块相比，东部地块在/之前的地壳演化似乎较少。

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《Journal of the Geological Society of India》 |1995年第5期|共11页
作者
B. Krishna Rao; M. Hanuma Prasad;
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正文语种 eng
中图分类地质学;
关键词
Geochemistry; Phyllites; Copper Mountain; Sandur Schist Belt; Kamataka;

机译：地球化学;玄武岩;铜山;Sandur Schist带;Kamataka;

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Geochemistry of the Fhyllites of the Copper Mountain Region, Sandur Schist Belt, Karnatafca

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