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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2020.1
- 수록면
- 633 - 649 (17page)
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초록· 키워드
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Appinite commonly occurs in convergent plate tectonic settings and thus can constrain the tectonic evolution of ancient orogens. Geochemical and geochronological analyses were carried out on a newly identified Early Triassic appinitic complex in southeastern Inner Mongolia in the eastern segment of the Central Asian Orogenic Belt. Petrographically, the Luotuochang complex can be divided into two zones: an outer zone of intermediate rocks and inner zone dominated by mafic rocks. A monzonite sample from the outer zone yielded weighted mean zircon 206Pb/238U ages of 246 ± 1.6 Ma, whereas the gabbro from the inner zone yielded an age of 243 ± 1.2 Ma. The inner zone mafic rocks have SiO2 contents of 45.56 to 54.27 wt% with high MgO, Cr, Ni and Sr contents, elevated Ba/Nb, Ba/Zr, Rb/Y and Th/Zr, and low TiO2, Nb/Zr and Nb/Y. These features suggest that the metasomatized lithospheric mantle is the primitive magma source. SiO2 contents of the outer zone intermediate rocks range from 57.6 to 63.69 wt% and K2O, Ba and Sr contents are enriched; the εNd(t) (+2.2 to +4.0) and εHf(t) (+8.4 to +13.5) values are also high. These characteristics suggest that the magma of these rocks mainly derived from the mantle with possible juvenile lower crust involvement. Based on these geochemical data and results from regional geological investigations, we propose that the Luotuochang appinitic complex was formed in a post-orogenic extensional setting. Its formation was likely the result of lithospheric delamination, upwelling of new mantle material and partial melting of the overlying lower crust during crustal compression and thickening soon after the closure of the restricted Paleo-Asian Ocean basin.
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참고문헌 (79)
참고문헌 신청
Andersen, T. / 2002 / Correction of common lead in U-Pb analyses that do not report 204Pb / Chemical Geology 192:59~79
Atherton, M. P. / 2002 / Slab breakoff : a model for Caledonian, Late Granite syn-collisional magmatism in the orthotectonic(metamorphic)zone of Scotland and Donegal, Ireland / Lithos 62:65~85
Blichert-Toft, J. / 1997 / The Lu-Hf geochemistry of chondrites and the evolution of the mantle-crust system / Earth and Planetary Science Letters 148:243~258
Castro, A. / 2003 / The appinite-migmatite complex of Sanabria, NW Iberian Massif, Spain / Journal of Petrology 44:1309~1344
Chen, B. / 2009 / Evolution of the Solonker suture zone : constraints from zircon U-Pb ages, Hf isotopic ratios and whole-rock Nd-Sr isotope compositions of subduction-and collision-related magmas and fore-arc sediments / Journal of Asian Earth Sciences 34:245~257
Atherton, M. P. / 2002 / Slab breakoff : a model for Caledonian, Late Granite syn-collisional magmatism in the orthotectonic(metamorphic)zone of Scotland and Donegal, Ireland / Lithos 62:65~85
Blichert-Toft, J. / 1997 / The Lu-Hf geochemistry of chondrites and the evolution of the mantle-crust system / Earth and Planetary Science Letters 148:243~258
Castro, A. / 2003 / The appinite-migmatite complex of Sanabria, NW Iberian Massif, Spain / Journal of Petrology 44:1309~1344
Chen, B. / 2009 / Evolution of the Solonker suture zone : constraints from zircon U-Pb ages, Hf isotopic ratios and whole-rock Nd-Sr isotope compositions of subduction-and collision-related magmas and fore-arc sediments / Journal of Asian Earth Sciences 34:245~257
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