Zircon U/Pb dating of Cretaceous adakitic volcanic rocks in the eastern part of North Dabie Mountains
作者： Xue Huaimin , Dong Shuwen , Liu Xiaochun
DOI: 10.1007/BF02842866
关键词:
摘要: Mesozoic volcanic rocks in the eastern part of North Dabie Mountains are rich Na (Na2O = 4.03%, Na2O/K2O 1.31), Sr (865μg/g) and Ba (1361μg/g), high Sr/Y ratio (66.1) but low Nb, Y HREE. They have experienced strong fractionation REE [(La/Yb)N 26.6], similar to adakite geochemical characteristics. The U-Pb dating zircon from is (129.2 ± 2.6) Ma, belonging Early Cretaceous. These Huaiyang not only age rare-earth element trace geochemistry, also formation temperature pressure minerals. results indicated that delamination mountain root underplating maficultramafic magma had happened orogen before magmatism was intense Mountains, including intrusion mafic-ultramafic magma, uplifting gneiss dome, explosion granitic magma. may be one volcano-intrusive complex belt Huaiyang. existence remnant cap means denudation orogenic very since
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