Origin of the Early Cretaceous Trachyte in Northern Guangdong Province Constraints of Sr-Nd-Pb Isotopes

Abstract

Abstract:

The trachyte in the Dachangsha basin of the northern Guangdong province was formed in the Early Cretaceous (SHRIMP
zircon U-Pb dating shows an age of trachyte as 135.3±1.5 Ma). The Sr-Nd-Pb isotopic composition cnaracteristics of trachyte are as follows: enriched in radiogenic lead，(206Pb/204Pb)i=18.23~18.39，(207Pb/204Pb)i = 15.78~15.88，(
208Pb/204Pb)i=38.83~39.14; moderate initial Nd isotopic ratios, εNd( t )=-3.35~-3.21; and higher initial Sr isotopic rations, (
87Sr/86Sr)i= 0.706871~0.709074. On the Pb-Pb diagrams, the trachyte is plotted above NHRL line and △Sr = 99.1~247.0 (140.5 in average), which indicates that the trachyte has obvious Dupal anomaly. The Sr-Nd, Sr-Pb, Nd-Pb and Pb-Pb relationship of the trachyte suggests that the trachyte should be originated from partial melting of the young lower crust， while the lower crust should be influenced by metasomatism of fluids from dehydration of subducted upper crust，and there was no upper crust contamination in the process of magma rising.

Key words: trachyte, Sr-Nd-Pb isotopes, lower crust, partial melting, Dachangsha basin

CLC Number:

XIANG Yuan-Xin, Wu-Jian-Hua. Origin of the Early Cretaceous Trachyte in Northern Guangdong Province Constraints of Sr-Nd-Pb Isotopes[J]. J4, 2011, 17(3): 436-.

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