Zircon U–Pb Geochronology, Geochemistry and Geological Significance of the Santaishan–Yingjiang Ultramafic Rocks in Western Yunnan, China
نویسندگان
چکیده
The study of ultramafic rocks in Western Yunnan is great significance for an understanding the tectonic evolution Neo-Tethys Ocean. zircon U–Pb data indicated that Santaishan serpentinized pyroxene peridotite (SSPP) was formed 186–190 Ma, and Yingjiang hornblende pyroxenite (YHP) 182–183 Ma. content MgO SSPP relatively high, but SiO2, Al2O3, CaO TiO2 ΣREE are low, while YHP has opposite characteristics. samples from have similar distribution patterns trace elements, both being enriched large ion lithophile elements (LILEs) such as Rb, Ba Th depleted high field strength (HFSEs) Ti, P Nb. These characteristics consistent with supra-subduction zone (SSZ) type mid-ocean ridge basalt (MORB) ophiolite Bangong–Nujiang suture zone. (87Sr/86Sr)i ratios (0.7091–0.7131) positive Hf(t) values (11.2–13.8), εNd(t) varying −1.1 to 9.4. low εHf(t) (3.5 6.9), Nd–Hf isotopic model ages ranging 610 942 signatures Sr–Nd Lu–Hf isotopes indicate were derived mantle, crustal material magma source may originated Neoproterozoic Rodinia supercontinent. In early Middle Jurassic (190 Ma), Tengchong Block setting active continental margin induced by subduction Ocean, where SSZ-type formed. With continuous slab retreated mantle convection, which resulted gradual thinning crust. Meanwhile, back-arc basin 183 Under influence upwelling asthenosphere mixture materials, MORB-type
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ژورنال
عنوان ژورنال: Minerals
سال: 2023
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min13040536