Magmatic peridotites and pyroxenites, Andong Ultramafic Complex, Korea: Geochemical evidence for supra-subduction zone formation and extensive melt-rock interaction
DC Field | Value | Language |
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dc.contributor.author | Whattam, Scott A. | - |
dc.contributor.author | Cho, Moonsup | - |
dc.contributor.author | Smith, Ian E. M. | - |
dc.date.accessioned | 2021-09-07T05:37:14Z | - |
dc.date.available | 2021-09-07T05:37:14Z | - |
dc.date.created | 2021-06-19 | - |
dc.date.issued | 2011-12 | - |
dc.identifier.issn | 0024-4937 | - |
dc.identifier.uri | https://scholar.korea.ac.kr/handle/2021.sw.korea/111026 | - |
dc.description.abstract | The Andong Ultramafic Complex (AUC) mainly comprises peridotites (wehrlites +/- plagioclase or spinel; or plagioclase + spinel) and related serpentinites with subordinate low-Al pyroxenites (clinopyroxenites, orthopyroxenites, and websterites). These rocks are compositionally similar to sub-continental lithospheric mantle peridotites and pyroxenites. Wehrlites formed predominantly by fractional crystallization processes within supra-subduction zone magmas and the pyroxenites are generally consistent with segregation and accumulation in similar magmas. Bulk rock ratios of Al2O3/SiO2 (0.01-0.03) and MgO/SiO2 (up to >1) exhibited by the wehrlites and serpentinites indicate crystallization from a refractory source that underwent high degrees of melt extraction. Spinel chemistry confirms this and demonstrates that wehrlite and clinoproxenite protoliths underwent approximately 20-23% and 12-15% partial melting, respectively. Wehrlites and serpentinites also preserve evidence of extensive melt-peridotite interaction manifest as bulk rock SiO2-depletions and FeOt-enrichments relative to mantle residua as well as low Mg# (0.39-0.45) spinels with variable Ti contents but constant Cr# (0.42-0.47). These features are identical to those of 'impregnated' plagioclase-peridotites of abyssal and sub-continental environments and compositional trends in spinel space imply reaction between secondary. MORB-like melts saturated in olivine + clinopyroxene or olivine and a harzburgitic protolith. High olivine:pyroxene (similar to 3:1) and clinopyroxene:orthopyroxene ratios of the wehrlites coupled with chemical data dictate that reactions entailed orthopyroxene dissolution and olivine recrystallization. All AUC rock types exhibit primitive mantle-normalized incompatible element signatures characterized by LILE-enrichments, high fluid-mobile/immobile element ratios (Sr/Nd, Ba/La and Pb/Ce >> 1) and prominent HFSE (Nb, Zr, and Ti) depletions indicative of generation in a sub-arc environment within a supra-subduction zone system. A candidate for the associated arc-system is the one responsible for nearby arc-related Jurassic granitoids. Southeast-directed thrusting along the Andong Fault System may account for subsequent emplacement of the AUC into the Gyeongsang Basin. (C) 2011 Elsevier B.V. All rights reserved. | - |
dc.language | English | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.subject | LITHOSPHERIC MANTLE BENEATH | - |
dc.subject | MID-ATLANTIC RIDGE | - |
dc.subject | RONDA PERIDOTITE | - |
dc.subject | TRACE-ELEMENT | - |
dc.subject | SOUTH-KOREA | - |
dc.subject | TECTONIC EVOLUTION | - |
dc.subject | SUBCONTINENTAL LITHOSPHERE | - |
dc.subject | RECRYSTALLIZATION FRONT | - |
dc.subject | LHERZOLITE MASSIF | - |
dc.subject | SPINEL-LHERZOLITE | - |
dc.title | Magmatic peridotites and pyroxenites, Andong Ultramafic Complex, Korea: Geochemical evidence for supra-subduction zone formation and extensive melt-rock interaction | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Whattam, Scott A. | - |
dc.identifier.doi | 10.1016/j.lithos.2011.06.013 | - |
dc.identifier.wosid | 000298513800015 | - |
dc.identifier.bibliographicCitation | LITHOS, v.127, no.3-4, pp.599 - 618 | - |
dc.relation.isPartOf | LITHOS | - |
dc.citation.title | LITHOS | - |
dc.citation.volume | 127 | - |
dc.citation.number | 3-4 | - |
dc.citation.startPage | 599 | - |
dc.citation.endPage | 618 | - |
dc.type.rims | ART | - |
dc.type.docType | Article | - |
dc.description.journalClass | 1 | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Geochemistry & Geophysics | - |
dc.relation.journalResearchArea | Mineralogy | - |
dc.relation.journalWebOfScienceCategory | Geochemistry & Geophysics | - |
dc.relation.journalWebOfScienceCategory | Mineralogy | - |
dc.subject.keywordPlus | LITHOSPHERIC MANTLE BENEATH | - |
dc.subject.keywordPlus | MID-ATLANTIC RIDGE | - |
dc.subject.keywordPlus | RONDA PERIDOTITE | - |
dc.subject.keywordPlus | TRACE-ELEMENT | - |
dc.subject.keywordPlus | SOUTH-KOREA | - |
dc.subject.keywordPlus | TECTONIC EVOLUTION | - |
dc.subject.keywordPlus | SUBCONTINENTAL LITHOSPHERE | - |
dc.subject.keywordPlus | RECRYSTALLIZATION FRONT | - |
dc.subject.keywordPlus | LHERZOLITE MASSIF | - |
dc.subject.keywordPlus | SPINEL-LHERZOLITE | - |
dc.subject.keywordAuthor | South Korea | - |
dc.subject.keywordAuthor | Ultramafic magmas | - |
dc.subject.keywordAuthor | Peridotite | - |
dc.subject.keywordAuthor | Melt-rock reaction | - |
dc.subject.keywordAuthor | Supra-subduction zone (SSZ) | - |
dc.subject.keywordAuthor | Volcanic arc | - |
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