Resolving the conundrum in origin of the Manipur Ophiolite Complex, Indo-Myanmar range: Constraints from Nd isotopic ratios and elemental concentrations in serpentinized peridotite

Kingson, Oinam; Bhutani, Rajneesh; Sebastian, Sibin; Balakrishnan, S.

doi:10.1016/j.chemgeo.2017.04.021

Cited by 38 publications

(15 citation statements)

References 47 publications

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“…Lithological and geochemical characteristics of the NHO suggest development of the ophiolitic rocks in a suprasubduction zone setting (Ghose et al, ; Kingson et al, , ). From this, it can be inferred that the NHO was obducted onto the eastern margin of India in response to collision of Greater India with an intraoceanic island arc that developed somewhere in the Neotethyan Ocean.…”

Section: Discussionmentioning

confidence: 99%

“…Pillow basalts and red chert are well represented within serpentinite‐matrix mélange that envelops meter‐ to kilometer‐scale mafic lenses and obscures original relationships between the various lithological components. Geochemical studies indicate that mafic volcanic rocks included within the mélange have a range of mid‐ocean ridge basalt, oceanic island basalt, and suprasubduction zone affinities (Devi & Singh, ; Kingson et al, , ; Sengupta et al, ; Singh, Singh, et al, ; Singh, Khogenkumar, et al, ). Rocks associated with the NHO have been assigned various ages.…”

Section: Regional Geologymentioning

confidence: 99%

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Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

Aitchison

Bhowmik

et al. 2019

Tectonics

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Results of biostratigraphic and geochronological investigations in eastern Nagaland and Manipur, NE India, provide new constraints on the tectonic evolution of the western margin of the Burma microplate. U/Pb zircon ages indicate that the Naga Hills ophiolite developed in a suprasubduction zone setting as part of an intraoceanic island arc developed during late Early Cretaceous (mid‐Aptian) time and is younger than similar rocks exposed along the Indus‐Yarlung Tsangpo suture zone. Radiolarian microfossils provide Jurassic and Cretaceous age constraints for Tethyan ocean floor sediments that were subducted beneath the forming ophiolite. Timing of the emplacement of these rocks onto the passive margin of eastern India is constrained by Paleocene/Eocene radiolarians in sediments over which the ophiolitic assemblage has been thrust. Previously undated schists and gneisses in the Naga Metamorphics are of Early Ordovician age, and their sedimentary protolith was most likely derived from sources in the south of Western Australian and East Antarctica. After Barrovian‐style metamorphism, these rocks were uplifted and eroded becoming an important source of detritus shed into the Eocene Phokphur Formation. This unit also contains abundant clasts sourced from the disrupted basement of the Naga Hills ophiolite, which it overlies. It also contains Permo‐Triassic‐aged detritus eroded off an enigmatic source that was possibly a continental convergent margin arc system somewhere along the northern margin of Gondwana.

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Section: Discussionmentioning

confidence: 99%

Section: Regional Geologymentioning

confidence: 99%

Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

Aitchison

Bhowmik

et al. 2019

Tectonics

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“…Possible accounts for such subduction origin were also geochemically proposed by Singh et al, 2016 and Zaccarini, Singh, Garuti, & Satyanarayanan, 2017. Recently, Kingson et al (2017) also claimed NMO as a full‐fledged example of fore‐arc magmatism in a subduction zone. Considering all these contradictory narratives, an attempt has been made in this article to re‐examine the existing literature data of various rock types of NMO and compile them together with new data to tackle the controversial interpretations regarding the genesis of NMO.…”

Section: Introductionmentioning

confidence: 85%

“…Some claimed that these two ophiolite belts are genetically unrelated; the eastern belt is a continuation of the Bangong‐Nujiang Suture (BNS) of the Meso‐Tethys Ocean, whereas the western belt is a continuation of the IYTS and represents relics of the Neo‐Tethys Ocean (Liu et al, 2016). The NMO in the western belt has recently gained attention due to the availability of geochemically diverse mafic and ultramafic rocks (Ao, Bhowmik, & Upadhyay, 2020; Bhowmik & Ao, 2016; Ghosh et al, 2017; Khogenkumar et al, 2016; Kingson, Bhutani, Dash, Sebastian, & Balakrishnan, 2017; Ovung et al, 2017; Singh, 2013; Singh et al, 2013; Singh et al, 2017). Geochemical studies on mantle peridotites from the NMO suggested that they are restites that went through low degree partial melting (~15%) of adiabatic process in a spreading centre (Devi & Singh, 2011; Ningthoujam, Dubey, Guillot, Fagio, & Shukla, 2012; Singh, 2009, 2013; Singh, Singh, Devi, & Singh, 2008; Soibam, Khuman, & Subhamenon, 2015).…”

Section: Introductionmentioning

confidence: 99%

Subduction versus non‐subduction origin of the Nagaland‐Manipur Ophiolites along the Indo‐Myanmar Orogenic Belt, northeast India: Fact and fallacy

et al. 2020

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The Nagaland‐Manipur Ophiolites (NMO) in northeast India is known for its complex geological history. Tough terrain, thick vegetation, and dismembered exposure of ophiolitic suite of rocks in the region made uneasy for geological investigation and put it in a deadlock for a long time. Only in the last decade has seen an appreciable amount of publications but the results boil down to a hot debate between two opposite schools of thoughts of subduction origin versus non‐subduction origin of the NMO. In this article, we revisit the literature data and compare it with our new geochemical data with an attempt to provide fresh insight into the long‐standing debate on the geodynamic evolution of the NMO. Our investigation arrives at the conclusion that the NMO as a whole cannot be considered as 100% subduction or 100% non‐subduction origin. It is indeed a combination of both. The non‐subduction group of mafic rocks shows a high ratio of incompatible elements (Nb/Yb >1), high‐Ti, enriched LILE, and HFSE with primitive mantle normalized values >5. Their bulk‐rock geochemical composition is equivalent to mid‐ocean ridge basalt (MORB) and ocean island basalt (OIB). The subduction group of rocks, on the other hand, shows a low ratio of incompatible elements (Nb/Yb <1), low‐Ti, depleted LILE, and HFSE with primitive mantle normalized values <1, affinity to the fore‐arc depleted N‐MORB type. Similarly, spinels present in subduction‐influenced mantle rocks show high chromium content (Cr# >50) but it is lower (Cr# <50) in non‐subduction abyssal peridotites of the NMO. Such geochemical variations cannot simply be explained by fractional crystallization or variable degree of partial melting of a single source, but rather signifies derivation from different tectonic settings of subduction and non‐subduction magma factories. We further conclude that the primary compressional force of India‐Myanmar Plate collision and secondary strike‐slip faults running along this ophiolite belt jeopardized the accretionary process which led to distortion and dismembering of the rocks like a scrambled bread.

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“…Well-studied Mesozoic Neo-Tethyan ophiolitic sequences are exposed along the northern Indian plate margin, that is, Indus Yarlung Tsangbo Suture (IYTS; Hebert et al 2012;Liu et al 2016;Bhat et al 2017aBhat et al , 2019aKingson et al 2017;Xiong et al 2017;Buckman et al 2018;Jadoon et al 2020). However, due to extreme high altitude (average height 3000 m) and poor accessibility to the Ladakh terrain, especially Kargil region of western Ladakh, limited research work has been carried out on the western Ladakh ophiolites, particularly on Suru-Thasgam dismembered ophiolitic slice, thrust over the Dras arc complex.…”

Section: Introductionmentioning

confidence: 99%

Petrological and geochemical characterization of the arc-related Suru–Thasgam ophiolitic slice along the Indus Suture Zone, Ladakh Himalaya

Bhat¹,

Ahmad²,

Rao³

et al. 2021

Geol. Mag.

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The Ladakh Himalayan ophiolites preserve remnants of the eastern part of the Neo-Tethyan Ocean, in the form of Dras, Suru Valley, Shergol, Spongtang and Nidar ophiolitic sequences. In Kohistan region of Pakistan, Muslim Bagh, Zhob and Bela ophiolites are considered to be equivalents of Ladakh ophiolites. In western Ladakh, the Suru–Thasgam ophiolitic slice is highly dismembered and consists of peridotites, pyroxenites and gabbros, emplaced as imbricate blocks thrust over the Mesozoic Dras arc complex along the Indus Suture Zone. The Thasgam peridotites are partially serpentinized with relict olivine, orthopyroxene and minor clinopyroxene, as well as serpentine and iron oxide as secondary mineral assemblage. The pyroxenites are dominated by clinopyroxene followed by orthopyroxene with subordinate olivine and spinel. Gabbros are composed of plagioclase and pyroxene (mostly replaced by amphiboles), describing an ophitic to sub-ophitic textural relationship. Geochemically, the studied rock types show sub-alkaline tholeiitic characteristics. The peridotites display nearly flat chondrite-normalized rare earth element (REE) patterns ((La/Yb)N = 0.6–1.5), while fractionated patterns were observed for pyroxenites and gabbros. Multi-element spidergrams for peridotites, pyroxenites and gabbros display subduction-related geochemical characteristics such as enriched large-ion lithophile element (LILE) and depleted high-field-strength element (HFSE) concentrations. In peridotites and pyroxenites, highly magnesian olivine (Fo88.5-89.3 and Fo87.8-89.9, respectively) and clinopyroxene (Mg no. of 93–98 and 90–97, respectively) indicate supra-subduction zone (SSZ) tectonic affinity. Our study suggests that the peridotites epitomize the refractory nature of their protoliths and were later evolved in a subduction environment. Pyroxenites and gabbros appear to be related to the base of the modern intra-oceanic island-arc tholeiitic sequence.

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Resolving the conundrum in origin of the Manipur Ophiolite Complex, Indo-Myanmar range: Constraints from Nd isotopic ratios and elemental concentrations in serpentinized peridotite

Cited by 38 publications

References 47 publications

Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

Tectonic Evolution of the Western Margin of the Burma Microplate Based on New Fossil and Radiometric Age Constraints

Subduction versus non‐subduction origin of the Nagaland‐Manipur Ophiolites along the Indo‐Myanmar Orogenic Belt, northeast India: Fact and fallacy

Petrological and geochemical characterization of the arc-related Suru–Thasgam ophiolitic slice along the Indus Suture Zone, Ladakh Himalaya

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