首页> 外文期刊>Journal of the Geological Society of India >Compositional variation in pyrochlores of Amba Dongar carbonatite complex, Gujarat
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Compositional variation in pyrochlores of Amba Dongar carbonatite complex, Gujarat

机译:古吉拉特邦Amba Dongar碳酸盐复合物的烧绿石成分变化

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摘要

Pyrochlore is interpreted as a primary magmatic mineral that appeared in early carbonatite phases at Amba Dongar. Later intrusive phases incorporated this early pyrochlore and caused compositional modification, particularly around the rims, in response to changing magma chemistry. Consequently pyrochlore compositions show wide ranges in Nb, Ta, Ca, Ba, Ti and Ce. The final carbonatite phase was ankeritic and rich in hydrothermal fluids, giving rise to extreme compositional zoning and introduction of diverse elements (Si, U, Sr, Th, Fe), in the contained pyrochlore. Enrichment in radioelements such as U lead to metamictization, alteration and A-site vacancy.
机译:烧绿石被解释为一种主要的岩浆矿物,出现在Amba Dongar的早期碳酸盐岩相中。后来的侵入相结合了这种早期的烧绿石,并引起了变质,特别是在轮缘周围,以响应岩浆化学变化。因此,烧绿石的成分在Nb,Ta,Ca,Ba,Ti和Ce中显示出很大的范围。最终的碳酸盐岩相是无角晶状的,富含热液,导致其所含的烧绿石具有极端的成分分区和多种元素(Si,U,Sr,Th,Fe)的引入。铀等放射性元素的富集会导致代谢,改变和A位空位。

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