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Postcollisional mafic–ultramafic rocks from the Dabie orogen were studied for their whole-rock major-trace elements and Sr–Nd–Pb isotopes in addition to zircon U–Pb ages and Lu–Hf isotopes. The results provide insights into the nature of orogenic lithospheric mantle in the continental collision zone. The zircon U–Pb dating gave consistent ages of 125±3 to 129±1Ma for magma crystallization. A few residual...
A combined study of zircon U–Pb ages, Lu–Hf isotopes, mineral O isotopes, whole-rock elements and Sr–Nd isotopes was carried out for alkaline intrusive rocks (including gabbro, syenite and granite) in the Sulu orogen. The results provide insights into crust–mantle interaction in the continental subduction zone. SIMS and LA-ICPMS zircon U–Pb dating yield Late Triassic ages of 201±2 to 212±1Ma for their...
Postcollisional mafic to felsic dykes in the western part of the Sulu orogen consist of monzogranite, diorite, plagioclase-bearing hornblendite and gabbro. LA-ICPMS zircon U–Pb dating yielded broadly consistent ages of 111±3 to 129±1Ma for their crystallization, with Neoproterozoic ages of 743±9 to 773±9Ma for residual cores. The mafic to felsic dykes are characterized by the arc-like patterns of...
Zircon Hf and whole-rock Sr–Nd isotopic compositions were determined for postcollisional mafic–ultramafic and felsic intrusive rocks in the Dabie orogen. The results provide not only insights into the character of their source rocks and the nature of crust–mantle interaction, but also constraints on the crustal architecture of continental collision orogen. SHRIMP zircon U–Pb dating gave concordant...
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