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Large igneous provinces - global perspectives and prospects in India

机译:火成大省-印度的全球前景和前景

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The origin and emplacement of Large Igneous Provinces (LIPs) is a challenging research frontier in earth sciences that has implications for understanding: (a) the dynamics and evolution of the earth's mantle, (b) atmosphere and climatic shifts, (c) redistribution of land and oceans, (d) biosphere involving transfer and migration of flora and fauna and mass extinctions, (e) metallogeny, and (f) source of hydrocarbons. In this review, we appraise contemporary models for the origin of LIPs (plume versus non-plume) to evaluate their strengths and limitations. We also examine vexed issues (e.g. nature and extent of mantle heterogeneity, role of fluids in LIP genesis, relation amongst carbonatites, kimberlites and LIPs, linkage of dyke swarms to LIPs and continental reconstruction and metallogeny) which are not readily explained by any of the models. Pursuable research frontiers in Indian igneous provinces (e.g. identification of new LIPs in the Precambrian, Fe-enrichment, fertility and thermal state of mantle below India, detailed study of lava stratigraphy and palaeomagnetism, assessment of duration of LIP activities, irrespective of compositional variability) are identified for future study. Despite large-scale magma generation, crust mantle interaction and geodynamic evolution of South Asia through the Phanerozoic, research on modern lines on Indian LIPs is limited. Research on LIPs deserves a major thrust in India for better understanding of the evolution of large magmatic provinces in the Peninsular and Extra-Peninsular regions.
机译:大火成岩省(LIPs)的起源和位置是地球科学中一个具有挑战性的研究前沿,对理解具有影响:(a)地球地幔的动力学和演化,(b)大气和气候变化,(c)地幔的重新分布陆地和海洋,(d)涉及动植物群转移和迁移以及大灭绝的生物圈,(e)成矿作用,以及(f)碳氢化合物来源。在这篇综述中,我们评估了LIPs的起源的当代模型(软胶与非软胶),以评估其优势和局限性。我们还研究了烦恼的问题(例如,地幔异质性的性质和程度,流体在LIP成因中的作用,碳酸盐岩,金伯利岩和LIP之间的关系,堤坝群与LIP的联系以及大陆重建和成矿作用),这些问题都无法轻易地得到解释。楷模。印度火成岩省的研究前沿(例如,在印度前寒武纪发现新的LIP,富铁,肥力和地幔的热状态,对熔岩地层和古磁性的详细研究,对LIP活动持续时间的评估,与成分变化无关)确定以供将来研究。尽管通过生代界发生了大规模的岩浆生成,地幔相互作用和南亚的地球动力学演化,但印度LIPs上现代线的研究仍然有限。在印度,对LIPs的研究值得大力推动,以便更好地了解半岛和半岛外地区大型岩浆省的演变。

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