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Fluid induced melting in mantle xenoliths and some implications for the continental lithospheric mantle from the Minusinsk Region (Khakasia, southern Siberia)

Kovacs, Istvan; Hidas, Karoly; Hermann, Joerg; Sharygin, Victor; Szabo, Csaba; Ntaflos, Theodoros

Description

Eleven representative xenoliths from the Minnsinsk Region, southern Russia were studied in order to highlight the characteristic features of the subcontinental lithospheric mantle beneath the region. Type-I xenoliths show that the lithosphere underwent various degree of depletion overprinted by enrichment processes leading to LREE-enriched pyroxenes. Estimated equilibrium temperature for the xenoliths is in the range of 960-1050°C. Type-II xenoliths are the result of crystallization from a...[Show more]

dc.contributor.authorKovacs, Istvan
dc.contributor.authorHidas, Karoly
dc.contributor.authorHermann, Joerg
dc.contributor.authorSharygin, Victor
dc.contributor.authorSzabo, Csaba
dc.contributor.authorNtaflos, Theodoros
dc.date.accessioned2015-12-10T22:31:18Z
dc.identifier.issn1335-0552
dc.identifier.urihttp://hdl.handle.net/1885/55475
dc.description.abstractEleven representative xenoliths from the Minnsinsk Region, southern Russia were studied in order to highlight the characteristic features of the subcontinental lithospheric mantle beneath the region. Type-I xenoliths show that the lithosphere underwent various degree of depletion overprinted by enrichment processes leading to LREE-enriched pyroxenes. Estimated equilibrium temperature for the xenoliths is in the range of 960-1050°C. Type-II xenoliths are the result of crystallization from a possibly basaltic melt close to the crust-mantle boundary. Three xenoliths in the Type-I series show evidence of incipient melting such as spongy rims of pyroxenes and interstitial glass. The spongy rim of clinopyroxene consist of clinopyroxene and glass with modal proportion of approximately 82 and 18%, respectively. Orthopyroxene rim contains olivine (65%) and glass (35%) with subordinate amounts of clinopyroxene (<5%). Glass within the spongy rim exhibits a clear geochemical affinity to interstitial glass as both have similarly high Al2O3, SiO2 and alkali contents. The interstitial glass and the spongy rims (minerals + glass) display light rare earth (LRE) element and large ion lithophile (LIL) element enriched character. This indicates that incipient melting of pyroxenes occurred in an open system and was likely triggered by the influx of a Na alkali silicate melt/fluid. The interstitial glass represents the residual melt after interaction with the pyroxenes. The formation of this Na-rich silicate melt may represent an earlier stage of the mantle magmatic event that produced the host basalt.
dc.publisherVydavatel'stvo Slovenskej Akademie Vied Veda
dc.sourceGeologica Carpathica
dc.subjectKeywords: lithospheric structure; mantle; melting; xenolith; Eurasia; Siberia Lithospheric mantle; Major and trace element geochemistry; Melting in the upper mantle; Minusinsk region; Petrology
dc.titleFluid induced melting in mantle xenoliths and some implications for the continental lithospheric mantle from the Minusinsk Region (Khakasia, southern Siberia)
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume58
dc.date.issued2007
local.identifier.absfor040304 - Igneous and Metamorphic Petrology
local.identifier.ariespublicationu9503261xPUB329
local.type.statusPublished Version
local.contributor.affiliationKovacs, Istvan, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHidas, Karoly, Eotvos Lorand University
local.contributor.affiliationHermann, Joerg, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationSharygin, Victor, Siberian Branch of Russian Academy of Science
local.contributor.affiliationSzabo, Csaba, Eotvos Lorand University
local.contributor.affiliationNtaflos, Theodoros, University of Vienna
local.description.embargo2037-12-31
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage211
local.bibliographicCitation.lastpage228
dc.date.updated2015-12-09T10:09:25Z
local.identifier.scopusID2-s2.0-34547133269
CollectionsANU Research Publications

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