Rb-Sr age of Godhra and related granites, Gujarat, India
Rb-Sr age of Godhra and related granites, Gujarat, India
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印度古吉拉特邦 Godhra 及相关花岗岩的铷-锶年龄
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发表时间：
1979
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影响因子：
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通讯作者：
S. Patel
中科院分区：
文献类型：
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作者：
K. Gopalan;J. R. Trivedi;S. Merh;P. P. Patel;S. Patel
报道了古吉拉特邦中部Godhra和地理上相关的花岗岩的铷和锶测定。整个岩石资料定义了一个Rb-Sr等时线，对应的共同年龄为955±20 m.y.，初始Sr比为0.7130±0.001。这一年龄明显高于拉贾斯坦邦西部阿布山和古吉拉特邦北部伊达尔的Erinpura组岩石的735岁。古吉拉特邦前寒武纪至少存在两代后德里侵入岩。与这些花岗岩相关的黑云母在实验误差范围内与整个岩石年龄相同，表明自就位以来没有明显的变质加热作用。具有重要意义的是，拉贾斯坦前寒武纪类似年龄的岩石主要分布在阿拉瓦利山脉的轴向带。
Rubidium and strontium determinations are reported for Godhra and geographically related granites from central Gujarat. The whole rock data define a Rb-Sr isochron corresponding to a common age of 955±20 m.y. and initial Sr ratio of 0·7130±0·001. This age is distinctly older than the age of 735 m.y. reported for the Erinpura suite of rocks from Mount Abu in western Rajasthan and from Idar in northern Gujarat. There are at least two generations of post-Delhi intrusive rocks in the Gujarat precambrian. Biotites associated with these granites have the same age as the whole-rocks within experimental error indicating the absence of significant metamorphic heating since the time of emplacement. It is significant that rocks of similar age occur in the Rajasthan Precambrian mainly in the axial zone of the Aravalli Mountains.