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A combined study of zircon U–Pb ages and Lu–Hf isotopes, whole-rock major-trace elements and Sr–Nd isotopes as well as whole-rock and mineral O isotopes was carried out for Mesozoic gabbroic intrusives in the southeastern edge of the North China Block (NCB). The zircon U–Pb dating yields consistent ages of 131±2 to 136±2Ma for magma crystallization. The gabbroic rocks are characterized by arc-like...
The subcontinental lithospheric mantle (SCLM) in the southern margin of the North China Block was modified by the Triassic subduction of the South China Block, but less is known about subsequent events. This study presents a geochemical study of its anatectic products, Mesozoic gabbroic rocks from the southeastern edge of the North China Block. Zircon U–Pb dating gave ages of 119±4 to 131±1Ma for...
Cenozoic continental basalts from east-central China were analyzed for their whole-rock major and trace elements as well as Sr–Nd–Hf–Pb and O isotopes. An integrated interpretation of all the results is used to place tight constraints on the nature of mantle source. The basalts are alkaline in lithochemistry and show the OIB-like patterns of trace element distribution. Their radiogenic isotopic compositions...
Pyroxenite xenoliths entrained in alkali basalts are usually interpreted to be high pressure cumulates from mantle-derived melts. However, those from Jiaohe, Northeast China may have originated from subducted oceanic crust. Their high bulk Al 2 O 3 contents (12.2–17.4%) and Mg# (up to 0.88) resemble those of olivine-bearing cumulative gabbros. A crustal origin for the Jiaohe pyroxenites...
Cenozoic continental basalts from east-central China have been analysed for whole-rock major and trace elements, Sr–Nd–Hf isotopes, and mineral O isotopes. The basalts are alkalic to tholeiitic in composition, but are dominantly alkalic. They are characterized by OIB-like patterns of trace element distribution, with no depletion in Nb and Ta but with negative Pb anomalies on primitive mantle normalized...
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