Neoarchean arc–juvenile back-arc magmatism in eastern Dharwar Craton, India: Geochemical fingerprints from the basalts of Kadiri greenstone belt

Manikyamba, C.; Ganguly, Sohini; Santosh, M.; Saha, Abhishek; Chatterjee, A. C.; Khelen, Arubum C.

doi:10.1016/j.precamres.2014.12.003

Cited by 51 publications

(15 citation statements)

References 118 publications

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“…The granitoid gneisses in the Northern Liaoning Terrane intrude regional metavolcanic rocks (Figure ). These tholeiitic to calc‐alkaline basalts and andesites record slab‐mantle wedge interactions, suggesting a suprasubduction zone setting (Figure S6) [ Manikyamba et al ., ]. Widespread occurrence of VMS‐type Cu‐Zn deposits are also hallmarks of accretionary orogens (Figure d) [ Huston et al ., ].…”

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confidence: 99%

Cyclic formation and stabilization of Archean lithosphere by accretionary orogenesis: Constraints from TTG and potassic granitoids, North China Craton

et al. 2017

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Accretionary orogens are major sites of modern continental growth, yet their role in the development of Archean continental crust remains enigmatic. Diverse granitoid suites from tonalite‐trondhjemite‐granodiorite (TTG) to potassic granitoids appeared during late Archean, representing a period of major continental formation and stabilization. In this study, whole‐rock geochemical and zircon U‐Pb and Lu‐Hf isotopic data are reported for Neoarchean granitoid gneisses from the Northern Liaoning Terrane, northeastern North China Craton (NCC). Older granitoid gneisses (~2592–2537 Ma) define three magmatic zones migrating from southeast to northwest, each showing a common magmatic evolution from high‐pressure TTGs to medium‐/low‐pressure TTGs and potassic granitoids. They have depleted zircon ƐHf(t) of +0.5 to +8.7. Younger ~2529–2503 Ma potassic granitoids and TTGs occur throughout the terrane, which are marked by variable zircon ƐHf(t) of −4.7 to +8.1, and are coeval with regional high‐grade metamorphism. Petrogenetic modeling and changing Sr/Y and (La/Yb)N of the granitoids suggest that the crust experienced episodic thickening and thinning and became progressively evolved through development of potassic granitoids and sedimentary successions. The metavolcanic basement to the granitoids display tholeiitic to calc‐alkaline affinities, together with the top‐to‐the‐northwest thrusting and associated volcanogenic massive sulfide‐type Cu‐Zn deposits, suggesting cyclic crustal formation of Northern Liaoning within an accretionary orogen with a SE‐dipping subduction polarity. Cyclic crustal thickening and thinning is related to tectonic switching from advancing to retreating relations between the downgoing and overriding plate. After ~2530 Ma, this accretionary system accreted to the ancient continental nucleus of NCC (Anshan‐Benxi Terrane), signifying final lithosphere stabilization.

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Section: Discussionmentioning

confidence: 99%

Cyclic formation and stabilization of Archean lithosphere by accretionary orogenesis: Constraints from TTG and potassic granitoids, North China Craton

et al. 2017

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“…The majority of the studied basalts occupy the compositional array for MORB, slab‐distal BABB (back‐arc basin basalts) and FAB (fore‐arc basalts) on V vs. Ti tectonic discrimination diagram (Figure c), while few samples correspond to the field for IAT also including slab‐proximal BABB and FAB. Ti, Sc, V, and Zr discrimination diagrams have been used by previous workers (Gamble, Wright, Woodhead, & McCulloch, ; Manikyamba, Ganguly, Santosh, Saha et al, ; Polat, Kerrich, & Wyman, ) to discriminate between arc, back‐arc, and MOR basalts. The studied samples indicate their intraoceanic back‐arc affinity by occupying the field of back‐arc basin basalts (BABB) on Ti/Sc, Ti/V, and Ti/Zr vs. Zr plots (Figure ) implicating a gradual geodynamic transition from back‐arc rifting to back‐arc extension during the episodes of magma genesis and eruption.…”

Section: Discussionmentioning

confidence: 99%

“…The geochemical characteristics of BABBs are either transitional between MORB and arc magmas or indistinguishable from arc‐derived melts due to spatial relation between arc and back‐arc systems. In general, the arc basalts are characterized by LILE enrichments and HFSE depletions, while BABB is compositionally analogous to MORB‐like melts with negligible LILE enrichment and HFSE depletion (Manikyamba, Ganguly, Santosh, Saha et al, ; Manikyamba, Ganguly, Santosh, Singh, & Saha, ). This typical character of BABB is maintained in mature back‐arc system where the domain of back‐arc basin melts is spatially separated and distinguishable from subduction‐arc regime (Stern et al, ).…”

Section: Discussionmentioning

confidence: 99%

“…Decompressional partial melting of asthenospheric mantle occurs under back‐arc spreading centres, and the residual‐depleted peridotitic asthenosphere is drawn by induced convection into the arc wedge. In the wedge, depleted peridotite melts under more hydrous conditions imparting higher LILE/LREE and HFSE/REE ratios relative to the back‐arc due to the more refractory mantle wedge, coupled with hydrous fluxing of non‐conservative elements from the slab (Gamble et al, ; Manikyamba, Ganguly, Santosh, Saha et al, ; Pearce & Peate, ; Woodhead, Eggins, & Gamble, ).…”

Section: Discussionmentioning

confidence: 99%

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Geochemical characteristics of basalts from Andaman subduction zone: Implications on magma genesis at intraoceanic back‐arc spreading centres

et al. 2018

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This study reports new petrological and geochemical data for the ocean floor volcanic rocks dredged from the back‐arc basin of the Andaman Sea and elucidates their geochemical characteristics and petrogenetic aspects to provide insights into the melt generation processes, oceanic crust emplacement, and tectonomagmatic evolution of the Andaman back‐arc basin. The studied samples are porphyritic basalts with olivine, plagioclase, and clinopyroxene representing the phenocrysts and the groundmass composition marked by plagioclase microlites, granular clinopyroxenes, and glass. Geochemical characteristics of these basalts reflect sub‐alkaline, tholeiitic composition of precursor magma that experienced clinopyroxene‐Ti magnetite fractionation. The overall geochemical trend for these basalts reflects LILE–HFSE–REE depleted MORB‐type chemistry which is modified by input from subduction‐derived components. Pronounced enrichment in selected LREE (Nd) and incompatible fluid‐mobile trace elements like Ba with positive primitive mantle‐normalized La and Sr anomalies in the majority of these basalts are attributed to transport and influx of slab‐dehydrated fluids and sediments into the depleted back‐arc mantle asthenosphere from the dehydrating subducted oceanic lithosphere in the volcanic arc front during initial stage of back‐arc rifting in the Andaman Sea. The studied basalts were derived by 10%–30% partial melting of a heterogeneous spinel lherzolitic mantle at a shallow depth. The chemical heterogeneity of the spinel lherozolite source suggests an enrichment‐depletion history of back‐arc mantle correlatable with the transitional tectonic evolution of the back‐arc basin from an initial rifting to matured spreading stage. The depleted MORB‐type mantle (DMM) beneath a juvenile back arc experienced infiltration of fluids and subduction‐derived components (SDC) from proximal subducting oceanic slab that gradually diminished with increasing distance from the arc and progressive back‐arc spreading. The episodes of melt generation and magma genesis invoke a gradual geodynamic transition from incipient back‐arc rifting to matured back‐arc spreading stages in the tectonomagmatic evolution of the Andaman back‐arc basin system. Oceanic crust generated during the incipient rifting stage sampled arc‐type melts enriched and hydrated by subduction inputs and fluid flux, while oceanic crust formed during matured back‐arc extension stage inherited trace element depleted MORB‐type mantle signatures devoid of subduction influence.

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“…composition (Swami Nath et al, 1976;Chadwick et al, 2000;Manikyamba et al, 2004Manikyamba et al, , 2014Manikyamba et al, , 2015Jayananda et al, 2006;2013, among others). Elongated greenstone belts hosting gold mineralization (Balakrishnan et al, 1999;Sarma et al, 2011) and voluminous calc-alkaline to potassic plutonic bodies, particularly the Closepet batholith, within tonalite-trondhjemite-granodiorite (TTG) define the major tectonic framework of this craton (Peucat et al, 1993Jayananda et al, 1995Jayananda et al, , 2013.…”

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Zircon U–Pb geochronology and Lu–Hf isotopes from the Kolar greenstone belt, Dharwar Craton, India: Implications for crustal evolution in an ocean-trench-continent transect

Yang

Santosh

2015

Journal of Asian Earth Sciences

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Neoarchean arc–juvenile back-arc magmatism in eastern Dharwar Craton, India: Geochemical fingerprints from the basalts of Kadiri greenstone belt

Cited by 51 publications

References 118 publications

Cyclic formation and stabilization of Archean lithosphere by accretionary orogenesis: Constraints from TTG and potassic granitoids, North China Craton

Cyclic formation and stabilization of Archean lithosphere by accretionary orogenesis: Constraints from TTG and potassic granitoids, North China Craton

Geochemical characteristics of basalts from Andaman subduction zone: Implications on magma genesis at intraoceanic back‐arc spreading centres

Zircon U–Pb geochronology and Lu–Hf isotopes from the Kolar greenstone belt, Dharwar Craton, India: Implications for crustal evolution in an ocean-trench-continent transect

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