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首页> 外文期刊>Acta Geologica Sinica >LA-ICPMS Zircon U-Pb Dating for Three Indosinian Granitic Plutons from Central Hunan and Western Guangdong Provinces and Its Petrogenetic Implications
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LA-ICPMS Zircon U-Pb Dating for Three Indosinian Granitic Plutons from Central Hunan and Western Guangdong Provinces and Its Petrogenetic Implications

机译：湘中和粤西三种印支期花岗岩质岩的LA-ICPMS锆石U-Pb定年及其成岩意义

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摘要

The LA-ICPMS zircon U-Pb geochronology of three typically Indosinian granitic plutons yielded weighted mean ~(206)Pb/~(238)U ages of 214.1+ -5.9 Ma and 210.3+ -4.7 Ma for the biotite monzomitic granites from the Xiema and Xiangzikou plutons In Hunan Province, and 205.3+ -1.6 Ma for biotite granite from the Napeng pluton,, western Guandong Province, respectively, showing a similar late Indosinian age of crystallization. In combination with other geochronological data from Indosinian granites within the South China Block (SCB), it is proposed that those late Indosinian granites with an age of approx 210 Ma and the early Indosinian granites (230-245 Ma) have the similar petrogenesis in identical tectonic setting. The Indosinian granites within the SCB might be the products of anatexis of the thickening crust in a compressive regime. These data provide a further understanding for the temporal and spatial distribution of the Indosinian granites and the dynamic evolution of the SCB.
机译：三种典型的印支期花岗岩岩体的LA-ICPMS锆石U-Pb年代学产生的Xiema黑云母独生岩花岗岩的加权平均〜（206）Pb /〜（238）U年龄为214.1+ -5.9 Ma和210.3+ -4.7 Ma分别位于湖南省的湘潭口和湘子口岩体，以及来自粤西那鹏岩体的黑云母花岗岩的205.3+ -1.6 Ma都显示出相似的印度支那晚期结晶年龄。结合华南地块（SCB）内印支期花岗岩的其他年代学数据，建议那些年龄约210 Ma的印支期晚期花岗岩和早期印支期花岗岩（230-245 Ma）具有相似的成岩作用。构造环境。 SCB内的印支期花岗岩可能是在压缩状态下增厚地壳的厌食症的产物。这些数据为印度支那花岗岩的时空分布和SCB的动态演化提供了进一步的了解。

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