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Harzburgite-dunite transition in the Nidar Ophiolitic Complex, Ladakh, NW India and its effect on olivine crystallographic fabric

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dc.contributor.authorSwarnendu Roy-
dc.contributor.authorKim, Daeyeong-
dc.contributor.authorKoushik Sen-
dc.date.accessioned2026-02-10T04:24:07Z-
dc.date.available2026-02-10T04:24:07Z-
dc.date.issued2025-11-
dc.identifier.urihttps://repository.kopri.re.kr/handle/201206/16607-
dc.description.abstractThe Nidar Ophiolitic Complex (NOC) of Ladakh, north India, is a well-preserved remnant of the Tethyan oceanic lithosphere. We performed mineral chemistry and microstructural analyses on five spinel-harzburgite and three spinel-dunite samples from its mantle section which show varying degree of serpentinization. The five harzburgite samples are divided into two types based on the mineral chemistry of olivine (Mg#=0.92-0.94) and spinel (TiO2=0-0.38 wt.%, Al2O3=8.67-27.46 wt.%, Cr#=0.50-0.81). These data, together with dynamic recrystallization textures, indicate high-temperature (≥ ∼1000 °C) origin for the peridotites. The first type includes three harzburgites with spinel and olivine chemistry indicating a spreading ridge to Supra-Subduction Zone origin, with A-type olivine Crystallographic Preferred Orientation (CPO) and a transtensional to simple shear regime of fabric formation. The second type consists of two harzburgites with boninitic affinity, showing D- and E-type olivine CPO and a simple shear regime of fabric formation. Mineral chemistry of the three dunites suggests melt-rock interaction and an island arc setting, with two showing A-type and one E-type olivine CPO and a transtensional regime of fabric formation. Transtensional regime inferred from vorticity analysis helps envisage an extensional setting for the lithospheric mantle. Dehydration of subducting oceanic slab, in a simple shear regime, led to hydration and partial melting of the mantle wedge, changing A-type fabric into E-type. Continued slab-pull resulted in further melting, dehydrating the remaining mantle and creating D-type fabric. This study demonstrates formation of replacive dunite from depleted harzburgite owing to melt-rock interaction and transformation of associated olivine CPO.en_US
dc.languageEnglishen_US
dc.subject.classification해당사항없음en_US
dc.titleHarzburgite-dunite transition in the Nidar Ophiolitic Complex, Ladakh, NW India and its effect on olivine crystallographic fabricen_US
dc.title.alternative인도 북서부 라다크 니다르 오피올라이트 복합체에서의 하츠버자이트-더나이트 전이와 감람석 결정학적 배향에 미치는 영향en_US
dc.typeArticleen_US
dc.identifier.bibliographicCitationSwarnendu Roy, Kim, Daeyeong, Koushik Sen. 2025. "Harzburgite-dunite transition in the Nidar Ophiolitic Complex, Ladakh, NW India and its effect on olivine crystallographic fabric". <em>PHYSICS AND CHEMISTRY OF THE EARTH</em>, 141(2): 0-0.-
dc.citation.titlePHYSICS AND CHEMISTRY OF THE EARTHen_US
dc.citation.volume141en_US
dc.citation.number2en_US
dc.identifier.doihttps://doi.org/10.1016/j.pce.2025.104210-
dc.citation.startPage0en_US
dc.citation.endPage0en_US
dc.description.articleClassificationSCIE-
dc.description.jcrRateJCR 2023:0en_US
dc.subject.keywordCrystallographic preferred orientation (CPO)en_US
dc.subject.keywordHimalayaen_US
dc.subject.keywordOlivineen_US
dc.subject.keywordOphioliteen_US
dc.subject.keywordRecrystallizationen_US
dc.subject.keywordUltramaficen_US
dc.identifier.localId2025-0255-
Appears in Collections  
2025-2025, 남극권 맨틀활동과 지체구조진화 연구 (25-25) / 박숭현 (PE25050)
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