Abstract
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.
Highlights
The NE-SW Naga Hills in the northeastern region of the Indo-Myanmar Ranges (IMR) at Manipur, Nagaland, regions of Arunachal Pradesh, and neighboring Western Myanmar states, Myanmar and central part of the mountainous region have been recognized as a small arcuate area for the formation of ophiolite [1]
We have been identified a total of five radiolarians taxa from the pelagic sediments of the study area and dominated the species of Zhamoidellum ovum dumitrica, Gongylothorax favosus dumitrica, Williriedellum crystallinum dumitrica, Hiscocapsa sp
The preservation of radiolarians was good excellent in all samples (Plates 1-3). It has been identified from the late Jurassic radiolarians of the Naga Hills Ophiolite belt (NHO) complex [15] [16]
Summary
The NE-SW Naga Hills in the northeastern region of the Indo-Myanmar Ranges (IMR) at Manipur, Nagaland, regions of Arunachal Pradesh, and neighboring Western Myanmar states, Myanmar and central part of the mountainous region have been recognized as a small arcuate area for the formation of ophiolite [1]. The Naga-Andaman suture passes through West Burma at the northeastern end of such a large collection of authorities, which flows over more than 3000 kilometers from NE India to the Andaman Island in the Ocean [2] [3] [4]. The Naga Hills, in northeastern India, represents the northern segment of the N-S trend in the Indo-Burmese Range (IBR), which is generally recognized as an extension of the Andaman-Indonesian island arc. The Naga Hills have connected to the eastern end of the Himalayas [4] and a narrow path from the late Mesozoic to early Paleogene
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