What is it about?
The paper presents newly acquired geochemical and mineralogical data on carbonatites and fluorapatite of the Newania intrusive complex, Rajasthan, India, and a magmatic−metamorphic hypothesis is proposed to explain the origin of this complex.
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Why is it important?
According to the age of the fluorapatite and zircon, the dolomite carbonatites were emplaced into the host granite-gneisses at 2120 Ma, and the transformation of the mineral assemblages and the crystallization of the U-rich pyrochlore occurred at 900 Ma in the course of metamorphic changes. Thus this carbonatite complex is one of the oldest throught the Indian continent.
Perspectives
The composition of the Newania carbonatites is close to those of ferro-magnesian intrusive carbonatites worldwide, but the Newania carbonatites differ from them in containing lower Ba, Ta, Zr, Th, and REE concentrations. Newly obtained genetic data on the mineral assemblages, composition, and age of the rocks allowed to more accurately constrain the emplacement age of the carbonatite melts and the duration of the metasomatic/metamorphic alterations of the rocks of the massif. For the first time, evidence of the residual magmatic and secondary metamorphic crystallization/recrystallization of the rocks have been established on the modern erosion level of the Newania massif. But proposed magmatic−metamorphic hypothes of the massif origin is needed in additional verification.
Boris V Belyatsky
Karpinsky Geological Institute (VSEGEI)
Read the Original
This page is a summary of: New Data on the Age and Genesis of the Newania Carbonatite Complex, Rajasthan, India, Geochemistry International, December 2022, Pleiades Publishing Ltd,
DOI: 10.1134/s0016702922120072.
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