印度东北部那加兰纳迦蛇绿岩山晚侏罗世放射虫岩的微古生物学和地球化学证据

R. Ayyamperumal, Ramasamy Sooriamuthu, Gnanachandrasamy Gopalakrishnan, Ganga Biswa, Rajkumar Perumal, Prerna Gahlaut, Nusrat Nazir, Justin K Antony
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引用次数: 0

摘要

我们分析了从纳加丘陵蛇绿岩带(NHO)纳加兰Meluri区采集的15个样品的放射虫组合(远洋沉积物)和地球化学研究,该样品由印度-缅甸边界外的Flysch-Naga-Arakan-Yoma槽组成。它反映了在印度梅卢里地区的那加兰发现的特提斯洋地壳喜马拉雅造山系的许多组成部分之一,它们的研究保存非常完好,可以确定为上侏罗纪(Kimmeridian-Tithonian中期)。除了一个连续的Kimmeridian-mid-Titonian序列外,本研究还鉴定了五个放射虫组合。这是迄今为止首次从纳加山蛇绿岩杂岩中回收远洋沉积物组合(放射虫类)。Naga Hills蛇绿岩带的样品落在次钠橄榄岩、锂橄榄岩和铁页岩铁砂区,A-CN-K图表明,源区的这些沉积物暴露在中等风化条件下。在判别图中,Naga Hill蛇绿岩Chert样品占据了沉积物石英岩的起源区,log(K2O/Na2O)与SiO2样品落入活动大陆边缘区,只有一个样品落入岛弧,表明Naga Hills Chert样品的构造格架沉积在活动大陆边缘,K2O/Al2O3和MgO/Al2O3图说明了Naga Hill蛇绿岩Chert海洋环境的构造背景。这些发现与那加兰省那加山目前的地质情况一致。
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Micropalaeontological and Geochemical Evidence of the Late Jurassic Radiolarians Cherts of Naga Ophiolite Hill, Nagaland, Northeast-India
We analyzed the radiolarian assemblages (pelagic sediments) and geochemical studies of 15 samples collected from Meluri district Nagaland, Naga Hills Ophiolite belt (NHO) and it consists of the Flysch Naga-Arakan-Yoma trough beyond the Indo-Myanmar border. It reflects one of the many components of the Himalayan Orogenic systems of Tethyan oceanic crust discovered in Nagaland at Meluri district of India and they have very well-preserved studies and can be identified to Upper Jurassic (Kimmeridgian-mid-Tithonian). As well as a continuous sequence of Kimmeridgian-mid-Tithonian, five radiolarian assemblages have been identified in this study. This is so far the first recovery of pelagic sediment assemblages (Radiolarians) from the Naga Hills Ophiolite complex. Samples of Naga Hills Ophiolite belts fell in the Sublitharenite, Litharenite, and Fe-shale Fe-sand area, and the A-CN-K diagram indicates that these sediments in the source region were exposed deep to moderate weathering conditions. In the discriminant plot, the Naga Hill-Ophiolite-Chert samples occupy the field of origin of the sediment quartzose, and the log (K2O/Na2O) versus SiO2 samples fall into the active continental marginal field, and only one sample falls into an island arch, suggesting that the tectonic framework of the Naga Hills-Chert samples was deposited in the active continental margin and the diagrams K2O/Al2O3 and MgO/Al2O3 illustrated the tectonic setting of the marine environment from Naga Hill Ophiolite Chert. Such findings have been consistent with the current geology of Naga Hills in the province of Nagaland.
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