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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Ion microprobe Pb-207/Pb-206 zircon ages for gneiss-granitoid rocks from Bundelkhand massif: Evidence for Archaean components
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Ion microprobe Pb-207/Pb-206 zircon ages for gneiss-granitoid rocks from Bundelkhand massif: Evidence for Archaean components

机译：Bundelkhand地块的片麻质-类质岩的离子微探针Pb-207 / Pb-206锆石年龄：太古成分的证据

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摘要

Radiometric Pb-207/Pb-206 ages of individual zircons from the Bundelkhand massif, central India, have been determined by an ion microprobe. Samples from various major lithe-units, viz, the granite gneiss, hornblende-, biotite- and leuco-granitoid are included in this study. The results provide evidence for the presence of Archaean crustal components within this massif. Zircons with ages of 3.0 to 3.2 Ga occur as xenocrysts in a sample of granite gneiss from Lalitpur having a minimum formation age of 2.5 Ga. Another sample of a highly deformed gneiss from Babina has a well-defined age of 2.7 Ga. Emplacement of hornblende-granitoid and biotite-granitoid took place in quick succession at similar to 2.5 Ga, No firm age for the youngest plutonic component, the leuco-granitoid, could be obtained due to poor recovery of zircons suitable for analysis, The geochronological data confirm the suggestion, based on geochemical studies, that the gneisses and the granitoids in this region represent Archaean and post-Archaean components, respectively. [References: 12]
机译：来自印度中部邦德尔汉德地块的单个锆石的放射性Pb-207 / Pb-206年龄已通过离子微探针测定。本研究包括来自各种主要的岩石单元的样品，即花岗岩片麻岩，角闪石，黑云母和无色粒状类固醇。结果提供了该地块内古生地壳成分的证据。在拉利特布尔的花岗岩片麻岩样品中，年龄为3.0至3.2 Ga的锆石以异变晶体形式存在，其最小形成年龄为2.5 Ga。巴比纳的另一个高度变形的片麻岩样品的明确年龄为2.7 Ga。 -类固醇和黑云母-类固醇以约2.5 Ga的速度快速连续发生，由于适合分析的锆石回收率低，因此无法获得最年轻的深部混溶成分（白垩系-类固醇）的稳定年龄，地质数据证实了这一建议，根据地球化学研究，该地区的片麻岩和花岗岩类分别代表古生和古生后的成分。 [参考：12]

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