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首页> 外文期刊>Journal of the Geological Society of India >Geochemical constraints on the petrogenesis and tectonic environment of gabbroic intrusives in the Siang Window of Eastern Himalaya, Northeast India
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Geochemical constraints on the petrogenesis and tectonic environment of gabbroic intrusives in the Siang Window of Eastern Himalaya, Northeast India

机译：地球化学对印度东北喜马拉雅山香格里拉辉辉岩侵入岩成因和构造环境的制约

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摘要

Carbonate and calcareous-quartzite of Miri-Buxa Group in the Siang Window of Eastern Himalaya intruded by mafic rocks of gabbroic affinity. These intrusive rocks are low-Ti tholeiites (Ti/Y = 379−478; Nb/La = 0.99−1.88) and characterized by enriched LILE-LREE, depleted in HFSE with minor REE fractionation [(La/Yb)N = 2.72−3.35)]. Geochemical behaviour of the incompatible trace elements with the rare earth elements abundances indicates their cogenetic nature and their emplacement in a continental rift tectonic environment. The liquidus olivine temperature of these mafic rocks ranges from 1262°C to 1380°C showing a gentle decrease of [Mg] with a steep increase of [Fe]. These charters thus imply that the rocks are either related to the extent of common source or fractionational crystallization of plagioclase and clinopyroxene from a single batch parental magma. Petrogenetic modeling of [Mg]-[Fe] and REE indicates that these mafic intrusives probably derived from a mantle source similar to komatiitic composition at moderate to high degree (8%–20%) of partial melting.
机译：喜马拉雅山脉东侧向窗中的美里-布沙族碳酸盐岩和钙质石英岩被辉长岩亲合的镁铁质岩侵入。这些侵入性岩石是低Ti辉绿岩（Ti / Y = 379−478； Nb / La = 0.99−1.88），其特征是富集的LILE-LREE，贫乏HFSE，稀土元素分馏率[（La / Yb）N = 2.72−3.35）]。不相容的微量元素与稀土元素的丰度的地球化学行为表明它们的共生性质及其在大陆裂谷构造环境中的位置。这些镁铁质岩石的液相线橄榄石温度范围从1262°C到1380°C，显示[Mg]缓慢降低，[Fe]急剧升高。因此，这些章程暗示这些岩石与单源母岩浆中斜长石和斜辉石的共同来源或部分结晶结晶有关。 [Mg]-[Fe]和REE的岩石成因模型表明，这些镁铁质侵入体可能来自与地幔成分相似的地幔来源，处于中等至高度（8％–20％）的部分熔融状态。

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