Age, origin, and tectonic significance of the Entabeni granite, northern Transvaal, South Africa

J.M. Barton Jr.; R. Doig; C. B. Smith

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Age, origin, and tectonic significance of the Entabeni granite, northern Transvaal, South Africa

机译：南非德兰士瓦北部的恩塔贝尼花岗岩的年龄，成因和构造意义

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New U-Pb isotopic data for zircon, Sm-Nd whole rock isotopic data, and REE whole-rock data indicate that the anorogenic Entabeni pluton of two-mica, alkali granite was emplaced 1957 ± 3 Ma ago and derived from tonalitic to trondbjemitic rocks. These rocks in turn were derived from a mafic source with an age of about 2810 Ma. The tonalitic and trondhjemitic rocks probably were not the Baviaanskloof Gneiss. The anorogenic emplacement of the Entabeni pluton conflicts tectoni-cally with the high-grade metamorphism and tectonism in the Central Zone of the Limpopo Belt between 2200 Ma and 1900 Ma ago and hence, apparently occurred before the Central Zone assumed its present position relative to the Southern Marginal Zone.

机译：新的锆石U-Pb同位素数据，Sm-Nd整岩同位素数据和REE整岩数据表明，两云母碱性花岗岩的成矿恩塔伯尼岩体始建于1957±3 Ma之前，从成色岩到三叠纪假山岩。这些岩石依次来自年龄约为2810 Ma的镁铁质岩浆。色母质和白垩纪的岩石可能不是Baviaanskloof片麻岩。恩塔贝尼岩体的造山作用与林波波带中部地区在2200 Ma至1900 Ma之前的高级变质作用和构造运动在构造上发生了冲突，因此，显然发生在中部地区相对于中部地区占据现在位置之前。南部边缘地区。

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《South African journal of geology》 |1995年第3期|p.326-330|共5页
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J.M. Barton Jr.; R. Doig; C. B. Smith;
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Department of Geology, Rand Afrikaans University, P.O. Box 524, Auckland Park, 2006 Republic of South Africa;

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中图分类地质学;
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Age, origin, and tectonic significance of the Entabeni granite, northern Transvaal, South Africa

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