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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2019.1
- 수록면
- 895 - 915 (21page)
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초록· 키워드
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The Spontang ophiolite complex exposed along the Indus Tsangpo Suture Zone (ITSZ) represents a fragment of oceanic lithosphere emplaced after the closure of the Neo-Tethyan Ocean. The complex lying south of the ITSZ forms the highest tectonic thrust slice above the Mesozoic–Early Tertiary continental margin in the Ladakh-Zanskar Himalaya. The complex consists of a well-preserved ophiolite sequence dominated by peridotites, gabbros and ultramafic cumulates along with highly tectonized sheeted dykes and pillow lavas. The mantle suite of rocks is represented by minor lherzolites, harzburgites and dunites. Chromian spinel is brown to reddish, and its morphology and textural relationship with coexisting silicates varies with strain. Spinel occurs as blebs and vermicular exsolutions within orthopyroxene to spherical inclusions within olivine, characteristic of which is the elongate holly leaf shape. Chrome spinels are characterized by low TiO2 and high Cr2O3 indicative of their depleted nature. Cr# [= atomic ratio Cr/(Cr + Al)] in the studied spinels are characterized by a small decrease in TiO2 for a larger increase in Cr# consistent with observations for spinels aligned along the Luobusa trend of the Yarlung Zangpo Suture Zone (YZSZ) ophiolites. Variations in Cr-spinel Cr# and Mg# observed in the investigated peridotites may have resulted from a wide range of degrees of mantle melting during their evolution. Mineral and whole-rock chemistry of the Spontang peridotites is characterized by interaction between depleted magma and pre-existing oceanic lithosphere, typical of supra-subduction zone settings. The Spontang peridotites have olivine, clinopyroxene and orthopyroxene compositions similar to those from both abyssal and fore-arc peridotites and display spoon shaped REE profiles characteristic of interaction between LREE-enriched melt, derived from the subducting slab and LREE depleted mantle residues. Equilibration temperatures calculated for the above rocks indicate that the studied samples represent typical mantle peridotites formed within the spinel stability field.
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참고문헌 (115)
참고문헌 신청
Bénédicte Abily / 2013 / The dunitic mantle-crust transition zone in the Oman ophiolite: Residue of melt-rock interaction, cumulates from high-MgO melts, or both? / Geology 41(1):67~70
Ahmad, T. / 2008 / Geochemical and isotopic constraints on the age and origin of the Nidar Ophiolitic Complex, Ladakh, India : implications for the Neo-Tethyan subduction along the Indus suture zone / Tectonophysics 451:206~224
Ahmed H. A. / 2012 / Compositional variations and tectonic settings of podiform chromitites and associated ultramafic rocks of the Neoproterozoic ophiolite at Wadi Al Hwanet, northwestern Saudi Arabia / Journal of Asian Earth Sciences 56:118~134
Aitchison, J. C. / 2000 / Remnants of a Cretaceous intra-oceanic subduction system within the Yarlung-Zangbo suture(southern Tibet) / Earth and Planetary Science Letters 183:231~244
Aitchison, J. C. / 2007 / Shoshonites in southern Tibet record Late Jurassic rifting of a Tethyan intraoceanic island arc / The Journal of Geology 115:197~213
Ahmad, T. / 2008 / Geochemical and isotopic constraints on the age and origin of the Nidar Ophiolitic Complex, Ladakh, India : implications for the Neo-Tethyan subduction along the Indus suture zone / Tectonophysics 451:206~224
Ahmed H. A. / 2012 / Compositional variations and tectonic settings of podiform chromitites and associated ultramafic rocks of the Neoproterozoic ophiolite at Wadi Al Hwanet, northwestern Saudi Arabia / Journal of Asian Earth Sciences 56:118~134
Aitchison, J. C. / 2000 / Remnants of a Cretaceous intra-oceanic subduction system within the Yarlung-Zangbo suture(southern Tibet) / Earth and Planetary Science Letters 183:231~244
Aitchison, J. C. / 2007 / Shoshonites in southern Tibet record Late Jurassic rifting of a Tethyan intraoceanic island arc / The Journal of Geology 115:197~213
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