Tectono-magmatic evolution of Tethyan oceanic lithosphere in supra subduction zone fore arc regime: Geochemical fingerprints from crust-mantle sections of Naga Hills Ophiolite

Verencar, A.; Saha, Abhishek; Ganguly, Sohini; Manikyamba, C.

doi:10.1016/j.gsf.2020.10.003

Cited by 22 publications

(13 citation statements)

References 124 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Some of these abyssal peridotites have been subsequently modified by interaction with a hybridized mantle-wedge melts as they got accreted to the overlying mantle wedge during subduction initiation (Ao et al, 2020). Whereas the overlying mantle, also known as the SSZ peridotites and cumulate section, are represented by more refractory serpentinites (Ovung et al, 2017), harzburgite (Kingson et al, 2017), lherzolite (Kingson et al, 2017;Verencar et al, 2021), websterite (Abdullah et al, 2018;Verencar et al, 2021), and dunites (Abdullah et al, 2018) together with chromitite pods (Pal et al, 2014) association. These rocks also show records of interaction with a melt of boninitic-tholeiitic affinity above the subduction zone (Khogenkumar et al, 2021;Pal et al, 2014;Verencar et al, 2021).…”

Section: Geological Settingmentioning

confidence: 99%

“…Whereas the overlying mantle, also known as the SSZ peridotites and cumulate section, are represented by more refractory serpentinites (Ovung et al, 2017), harzburgite (Kingson et al, 2017), lherzolite (Kingson et al, 2017;Verencar et al, 2021), websterite (Abdullah et al, 2018;Verencar et al, 2021), and dunites (Abdullah et al, 2018) together with chromitite pods (Pal et al, 2014) association. These rocks also show records of interaction with a melt of boninitic-tholeiitic affinity above the subduction zone (Khogenkumar et al, 2021;Pal et al, 2014;Verencar et al, 2021). The age of the ophiolites is variously assigned at Upper Jurassic age based on a study from the radiolarians and whole-rock K-Ar ages of basalts (Baxter, Aitchison, Zyabrev, & Ali, 2011;Sarkar et al, 1996) and an Early Cretaceous age based on U/Pb zircon ages of plagiogranites (Aitchison et al, 2019;Singh, Chung, Bikramaditya, & Lee, 2017).…”

Section: Geological Settingmentioning

confidence: 99%

“…Thus, the geochemical study of mantle peridotites from ophiolite complexes can provide important information on their tectonic origin and melt-mantle interaction in an SSZ setting. Mantle peridotites from the NMOC show geochemical signatures that indicate their formation in both MOR settings (Ao, Bhowmik, & Upadhyay, 2020;Ghosh et al, 2018;Khogenkumar et al, 2021;Ningthoujam, Dubey, Guillot, Fagio, & Shukla, 2012;Singh, 2009Singh, , 2013Singh, Nayak, et al, 2017) and SSZ setting (Abdullah, Misra, & Ghosh, 2018;Kingson, Bhutani, Dash, Sebastian, & Balakrishnan, 2017;Ovung et al, 2017;Pal et al, 2014;Verencar, Saha, Ganguly, & Manikyamba, 2021). However, the detailed geochemical study of mantle peridotites from the northern margin of the NMOC, that falls within the northern tip of the Nagaland Ophiolite Complex (NOC) is lacking at present.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Petrogenesis of mantle peridotite and cumulate peridotite rocks from the Nagaland Ophiolite Complex, NE India

Satyanarayanan

2021

Geological Journal

View full text Add to dashboard Cite

Here, we report new geochemical data from mantle peridotite (spinel lherzolite, dunite, and harzburgite) and cumulate peridotite (websterite) rocks from the northernmost portion of the Nagaland Ophiolite Complex. Based on detailed textural, mineral (major element) chemistry, and whole-rock (major and trace element) chemistry, we reveal the origin of these rocks in different tectonic settings and their modification via the melt-mantle interaction process. The spinel lherzolite rocks with low Cr# (0.16-0.25) chrome spinel are mantle residues formed after low degrees ($10-15%) of partial melting in a mid-oceanic ridge setting, which has been subsequently modified in a subduction zone setting. However, the dunites and harzburgite samples are interpreted to be depleted mantle residue formed in a supra-subduction zone (SSZ) setting. Additionally, the dunites are inferred to be of replacive origin representing former harzburgites. Based on Cr# of chrome spinel, the dunites are classified into low Cr# (0.53-0.57), medium Cr# (0.73-0.79), and high Cr# (0.89-0.90) dunites. High Cr# dunite with low-TiO 2 (0.01-0.06 wt%) possibly formed by interaction with a boninitic melt, whereas low-medium Cr# dunite with high TiO 2 (0.14-0.34 wt%) formed by interaction with a high-Ti melt in an SSZ setting. Harzburgite samples with their highly resorbed orthopyroxene grain boundaries contain chrome spinels (Cr# = 0.84-0.88; TiO 2 = 0.00-0.06 wt%) similar to the high Cr# dunite samples and are also interpreted to be formed by interaction with a boninitic melt. The websterite samples with their low Mg# (0.79) olivine and low Ni (345-413 ppm) content are interpreted to be of cumulate origin formed in an SSZ setting. However, the interstitial chrome spinel blebs with low Mg# (0.18-0.19), high Cr# (0.60-0.61), Fe 3+ (0.20-0.21), and very high TiO 2 (2.03-2.04 wt%) are interpreted to be a result of post-cumulus interaction of interstitial chrome spinel with high-Ti intercumulus melt.These mantle peridotites and cumulates of different tectonic origins were obducted and juxtaposed during the final stages of the India-Asia collision.

show abstract

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Petrogenesis of mantle peridotite and cumulate peridotite rocks from the Nagaland Ophiolite Complex, NE India

Satyanarayanan

2021

Geological Journal

View full text Add to dashboard Cite

show abstract

“…Mantle refertilization and melt replenishment by subduction-derived melt percolation, plume-derived melt input, and episodic recycling of oceanic and continental crust are principal proponents for the chemical diversity of the upper mantle [88,89]. These thermotectonic conditions render inevitable imprint on the mineralogical and whole rock geochemical compositions of oceanic crust and mantle lithologies [9,68,88,90]. The unambiguous influence of mantle plume and recycled and stagnant subducted slabs on the composition of ridge mantle beneath oceanic spreading centers across the globe has been widely discussed [91].…”

Section: Implications For a Geodynamic Transitionmentioning

confidence: 99%

Refertilization of Mantle Peridotites from the Central Indian Ridge: Response to a Geodynamic Transition

et al. 2021

View full text Add to dashboard Cite

The phenomena of reactive percolation of enriched asthenospheric melts and pervasive melt-rock interactions at mid oceanic ridge-rift systems are the principal proponents for mantle refertilization and compositional heterogeneity. This study presents new mineralogical and geochemical data for the abyssal peridotites exposed along the Vema and Vityaz fracture zones of the Central Indian Ridge (CIR) to address factors contributing to the chemical heterogeneity of CIR mantle. Cr-spinel (Cr#: 0.37-0.59) chemistry classifies these rocks as alpine-type peridotites and corroborates a transitional depleted MORB type to enriched, SSZ-related arc-type magma composition. HFSE and REE geochemistry further attests to an enriched intraoceanic forearc mantle affinity. The distinct boninitic signature of these rocks reflected by LREE>MREE<HREE and PGE compositions substantiates refertilization of the CIR mantle harzburgites by boninitic melt percolation concomitant to initiation of oceanic subduction. The mineral chemistry, trace, and PGE signatures of the CIR peridotites envisage (i) replenishment of depleted sub-ridge upper mantle by impregnation of subduction-derived boninitic melts, (ii) tectonic transition from mid oceanic ridge-rift to an embryonic suprasubduction zone, and (iii) initiation of spontaneous intraoceanic subduction along submarine transform faults and fracture zones of slow-spreading CIR owing to the weakness and mechanical instability of older, denser, and negatively buoyant Indian Ocean lithosphere.

show abstract

“…Bandyopadhyay et al(2020) has also provided a three-stage regional kinematic history based on the available geochemical and new geochronological constraints and have argued for an SSZ origin for the Andaman Ophiolite. Based on petrological attributes, the associated Naga Hills Ophiolite of the Indo Burma Region has also been attributed to the SSZ environment(Ghosh et al 2009; Saha et al 2018; Pal 2020;Verencar et al 2021). The veracity of various theories on development of the Andaman Ophiolite is debatable due to the lack of all-inclusive work (especially the major and trace chemistry of minerals) spanning the various rock types exposed on the Andaman Islands.…”

mentioning

confidence: 99%

Cumulate gabbros in the South Andaman Island ophiolite suite (India): their bearing on the tectonic setting

2021

View full text Add to dashboard Cite

The Andaman Ophiolite of south-eastern India is located on the outer arc of the Andaman-Java subduction zone. It is represented by thrust slices formed in the Mesozoic Neo-Tethyan Ocean. Lithologically, it consists of dismembered mafic and ultramafic rocks and associated oceanic pelagic sediments. The present study focuses on the mafic cumulate rocks of the Andaman Ophiolite preserved in the Kodiaghat and the Mundapahar area of the South Andaman Island. The mafic cumulates are represented by olivine-bearing and olivine-free gabbros. The sequence of crystallisation in the gabbros is olivines (Fo~80) ± chromian spinels (Cr# 59 - 57), plagioclases (An95−61), clinopyroxenes (Mg# = 89 - 82) and amphiboles (Mg-hornblende, edenite and pargasite). Major oxide and trace element whole rock geochemistry and mineral compositions are consistent with a hybrid signature of Island Arc Tholeiite (IAT) - Mid Oceanic Ridge Basalt (MORB). Geochemical modelling shows that trapped melt fractions of 0 – 20 % can produce the observed trace element signatures of these gabbros. Our findings suggest that the gabbroic cumulates of the Andaman ophiolite were formed in an oceanic back-arc and oceanic arc setting developed in the Neo-Tethyan oceanic domain between the Indian and the Burmese plates during Late Cretaceous age.

show abstract

Tectono-magmatic evolution of Tethyan oceanic lithosphere in supra subduction zone fore arc regime: Geochemical fingerprints from crust-mantle sections of Naga Hills Ophiolite

Cited by 22 publications

References 124 publications

Petrogenesis of mantle peridotite and cumulate peridotite rocks from the Nagaland Ophiolite Complex, NE India

Petrogenesis of mantle peridotite and cumulate peridotite rocks from the Nagaland Ophiolite Complex, NE India

Refertilization of Mantle Peridotites from the Central Indian Ridge: Response to a Geodynamic Transition

Cumulate gabbros in the South Andaman Island ophiolite suite (India): their bearing on the tectonic setting

Contact Info

Product

Resources

About