LA-ICP-MS Zircon U-Pb Ages and Hf Isotopic Compositions of Dayang Granite from Longyan, Fujian Province

Abstract

Abstract:

A comprehensive research including LA-ICP-MS zircon U-Pb dating and Hf isotopic composition analysis on Dayang granitic pluton was carried out. We obtained the LA-ICP-MS zircon U-Pb ages of (144.8±0.9) Ma and (127.5±0.4) Ma for the early medium coarse grained biotite granite and the late medium fine grained plagioclase granite in Dayang granitic pluton, respectively. According to zircon Hf isotope analyses, the both εHf(t) values are from -5.58 to -2.00 and from -7.57 to -0.90, and their corresponding Hf two stage model ages (TDM₂) are from 1,313 to 1,530 Ma and from 1,246 to 1,668 Ma, respectively. These data suggest that the magma sources of the two stages in Dayang granite mainly derived from Mesoproterozoic crustal materials, but the second stage involved some portions of mantle component. Dayang granite formed in the Early Cretaceous, which implies that it generated in basaltic underplating under lithosphere extension environment.

Key words: LA-ICP-MS zircon U-Pb dating, Hf isotope, Dayang granite, Longyan, Fujian

ZHANG Cheng-Shuai, LI Chi, ZHANG Chang-Jing, WANG Jiu-Ru. LA-ICP-MS Zircon U-Pb Ages and Hf Isotopic Compositions of Dayang Granite from Longyan, Fujian Province[J]. Geoscience, 2012, 26(3): 433-444.

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