Reaction microtextures in entrapped xenoliths in alkali basalts from the Deccan large igneous province, India: Implications to the origin and evolution

Chattopadhaya, Soumi; Ghosh, Biswajit; Morishita, Tomoaki; Nandy, Sandip; Tamura, Akihiro; Bandyopadhyay, Debaditya

doi:10.1016/j.jseaes.2017.01.028

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…In mantle, the reaction zones originated as a result of metasomatic reactions [1,2], fluid-induced partial melting [3] or decompression partial melting [4]. During transportation and ascend to the surface, the reaction zones are formed due to interaction of xenoliths with the host alkaline basaltic magmas [5,6] or decompression partial melting [7].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Lherzolite Xenoliths with Basanite is not Isochemical: Evidence from Tumusun Volcano, Baikal Rift Zone

Gornova¹,

Belyaev²,

Karimov³

et al. 2023

Preprint

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To investigate the process and chemistry of reaction zone formation, we conducted detailed petrographic observations and major-trace element analysis of rocks and minerals of lherzolite xenoliths from basanites of Tumusun volcano (Baikal Rift Zone). The reaction zones gradually disappear from contact toward center of xenoliths. This indicates their formation as a result of lherzolite-basanite interaction. The influence of basanite melt on major-trace element composition of secondary minerals of reaction zones is notable only at distance up to 100-200 μm from the contact. The major-trace element composition of secondary clinopyroxenes from orthopyroxene reaction zone indicates their formation from a melt formed by dissolution of orthopyroxene and influenced by element diffusion from basanite melt. Inside xenoliths the secondary minerals have Mg# values equal to or higher than Mg# of primary minerals. The secondary clinopyroxenes inherit their depleted or enriched REE pattern from primary pyroxenes. The major-trace element variations in secondary clinopyroxenes testify melt heterogeneity. Secondary clinopyroxene has slightly higher LILE and similar abundances of other trace elements compared to unreacted part of clinopyroxene grain. This is consistent with model developed from experimental studies: due to the interaction with basanite, incongruent dissolution of orthopyroxene occurs to form a melt which circulates in lherzolite and leads to pyroxenes and spinel dissolution. Non-dissolved centers of minerals are homogenous and similar in major-trace element composition to primary minerals. The process of peridotite-basanite interaction is not isochemical: even the centers of large xenoliths become enriched in LILE.

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Section: Introductionmentioning

confidence: 99%

Interaction of Lherzolite Xenoliths with Basanite is not Isochemical: Evidence from Tumusun Volcano, Baikal Rift Zone

Gornova¹,

Belyaev²,

Karimov³

et al. 2023

Preprint

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“…Ultramafic xenoliths provide valuable evidence of the chemical composition, mineralogy, and P‐T conditions for the lower crust and lithospheric mantle (Chattopadhaya et al, ; Kaczmareck et al, ; MaalØe & Aoki, ; Nixon, ; Perinelli, Bosi, Andreozzi, Conte, & Armienti, ; Rudnick, ; Satsukawa, Godard, Demouchy, Michibayashi, & Ildefonse, ). As noted in previous studies, most examples of mantle‐derived xenoliths occur in association with continental rifts or oceanic hot spots (Nixon, ).…”

Section: Introductionmentioning

confidence: 99%

Lithospheric mantle processes beneath Kurose islet, Southwest Japan

Kil

Seol

2017

Geological Journal

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Upper mantle xenoliths enclosed in Cenozoic alkali basalts in Southwest Japan were found at Kurose Islet. The xenoliths consist primarily of harzburgite and minor lherzolite and exhibit a porphyroclastic texture. Trace element data showing relative depletion in light rare earth elements (REEs) and general spoon‐shaped patterns suggest that xenoliths experienced depletion and slight enrichment processes. Incompatible trace element patterns for the spinel peridotite xenoliths indicate varying degrees of modification by fractional melting (from 6 to 11%). The Kurose spinel peridotites appear to have undergone melt extraction followed by an episode of cryptic mantle metasomatism. A nearby silicate melt may have been the metasomatic agent affecting spinel peridotites. The spinel peridotites originated from depths of 48 to 51 km at equilibrium temperatures ranging from 1030 to 1082 °C.

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Multistage evolution of subcontinental lithospheric mantle of northwestern Deccan volcanic province, India: Constraints from the ultramafic xenoliths in alkali magma

et al. 2022

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Reaction microtextures in entrapped xenoliths in alkali basalts from the Deccan large igneous province, India: Implications to the origin and evolution

Cited by 7 publications

References 43 publications

Interaction of Lherzolite Xenoliths with Basanite is not Isochemical: Evidence from Tumusun Volcano, Baikal Rift Zone

Interaction of Lherzolite Xenoliths with Basanite is not Isochemical: Evidence from Tumusun Volcano, Baikal Rift Zone

Lithospheric mantle processes beneath Kurose islet, Southwest Japan

Multistage evolution of subcontinental lithospheric mantle of northwestern Deccan volcanic province, India: Constraints from the ultramafic xenoliths in alkali magma

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