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首页> 外文期刊>Contributions to Mineralogy and Petrology >Unravelling the complexities in high-grade rocks using multiple techniques: the Achankovil Zone of southern India
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Unravelling the complexities in high-grade rocks using multiple techniques: the Achankovil Zone of southern India

机译：使用多种技术揭示高品位岩石的复杂性：印度南部的阿尚科维尔带

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摘要

The Achankovil Zone of southern India forms a distinct isotopic and structural boundary separating the Madurai Block to the north from the Trivandrum Block to the south. We combine isotopic and trace element geochemistry of major and accessory phases with phase equilibria modelling to provide quantitative constraints on the timing and conditions of peak metamorphism and the nature of the protoliths within the Achankovil Zone. The results suggest a clockwise pressure-temperature path with peak metamorphic temperatures of up to 950 degrees C at pressures of around 0.7 GPa followed by high-temperature decompression. The metamorphic peak occurred at 545-512 Ma. U-Pb and Hf isotopic analysis of detrital zircon shows that the rocks have a strong affinity with the southern part of the Madurai Block. The Achankovil Zone is interpreted as the reworked southern margin of the Madurai Block, which was metamorphosed during the final stages of the assembly of Gondwana.
机译：印度南部的Achankovil区形成了一个独特的同位素和结构边界，将北部的Madurai区块与南部的Trivandrum区块分隔开。我们将主要相和副相的同位素和痕量元素地球化学与相平衡建模相结合，以提供对峰值变质时间和条件以及Achankovil区内原岩性质的定量约束。结果表明，在约0.7 GPa的压力下，最高变质温度达到950℃时，是顺时针方向的压力-温度路径，然后进行高温减压。变质峰出现在545-512 Ma。碎屑锆石的U-Pb和Hf同位素分析表明，这些岩石与Madurai区块的南部具有很强的亲和力。 Achankovil地带被解释为Madurai街区的改造后南部边缘，该区域在冈瓦纳组装的最后阶段变形。

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