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首页> 外文期刊>South African Journal of Geology: Being the Transaction of the Geological Society of South African: Syndie die Verhandelinge van die Geologiese Vereniging van Suid-Afrika >Lithostratigraphy of the Mesoproterozoic Garies Granite
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Lithostratigraphy of the Mesoproterozoic Garies Granite

机译：Mesoproterozoice Gries Granite的岩石岩

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摘要

The Garies Granite is a mesocratic to leucocratic, porphyritic post -tectonic member of the Spektakel Suite in the Mesoproterozoic Namaqua-Natal Belt of western Namaqualand. It is a composite unit, showing a continuum of rock types from mesocratic porphyritic biotite granite with characteristic slender phenocrysts (Rooiberg-type) to coarse grained equigranular leucocratic granite (Karkams-type) with few or no phenocrysts at all. Metamict zircons prevented accurate dating, but field relationships suggest the Garies Granite is synchronous to slightly younger than the spatially associated Kliphoek Granite, which has recently been dated at 1078 +/- 5 Ma and 1060 +/- 9 Ma. The acidic, potassic and weakly peraluminous granite yielded epsilon(Nd) values of between -1.39 and 0.61 and T-DM values of between 1579 and 1710 Ma indicating a significant contribution of older crustal material to the source magma.
机译：花岗岩花岗岩是一种孢子型卟啉柱的青霉素，位于Namaqualand西部的中塞曲群岛南野纳米宫颈带的Spektakel套件。 它是一种复合单元，显示来自青蛙卟啉生物偶像石的岩石类型的连续体，具有特征细长的苯杂交（Rooiberg型）到粗粒粒细胞的平静花岗岩（Karkams-型）根本没有苯杂交。 代购锆石防止准确的约会，但场合关系表明，花岗岩花岗岩比空间相关的Kliphoek花岗岩同步，最近被约为1078 +/- 5 mA和1060 +/- 9 mA。 酸性，型大钾和弱衰弱的花岗岩产生ε-1.39和0.61和0.61和T-DM值的ε值为1579和1710 mA，表明旧地壳材料对源岩浆的显着贡献。

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