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NIU Decao, ZHANG Zhiping, DONG Han, WANG Hongtao, WU Xuemei. 2021: Petrogenesis of the Zhagadang O-type adakite in Naidong County of Tibet: Constraints from its geochemistry and Sr-Nd-Pb isotopic compositions. Geological Bulletin of China, 40(8): 1369-1379.
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Adakite, as a set of intermediate-acid igneous rock assemblages with special geochemical characteristics, has a variety of genetic models and special tectonic significance.The Zedang ophiolite is of great significance to the study of the evolution of the Neo-Tethys Ocean.The trondhjemite outcropped in the Zedang ophiolite was selected to study its petrology, petrochemistry and Sr-Nd-Pb isotopes.The results show that the Zhagadang trondhjemite is a high SiO2 and Al2O3, rich Na2O(Na2O/K2O>2), low MgO, and para-aluminous calc-alkaline series.It is characterized by high Sr and Sr/Y, low Y and Yb.These geochemical characteristics are comparable with those of O-type adakite.The Zhagadang trondhjemite is rich in large ion lithophile elements(e.g., Rb, K and Ba), poor in high field-strength elements(e.g., Nb, Ti and P) and rare earth elements, and exhibits a weak positive Eu anomaly.The Sr-Nd-Pb isotopic compositions indicate that the Zhagadang trondhjemite is characterized by high Sr, Sm, Nd and Pb contents, with ISr of 0.704251~0.704329, INd of 0.512776~0.512807, positive εNd(t) values(6.61~7.22) and relatively uniform lead isotopic composition(206Pb/204Pb=18.378~18.495, 207Pb/204Pb=15.542~15.554 and 208Pb/204Pb=38.336~38.406).The study indicates that the Zhagadang trondhjemite bearing mantle characteristics was formed by partial melting of the subducting oceanic slab at a certain depth.The result confirms the existence of the Zedang intra-oceanic.
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