Petrogenesis of Volcanic Rocks from Sankeyushu Formation in Southern Jilin: Evidences from Zircon U-Pb Ages and Hf Isotopes

Abstract

Abstract:

Zircon U-Pb dating by LA-ICP-MS shows that Sankeyushu Formation trachyte in southern Jilin area formed in 118 Ma of late Early Cretaceous. Study of petrogeochemistry suggests that SiO₂contents from Sankeyushu Formation trachyte are 6511%-6561%,rich in alkali(K₂O=6.29%-7.28%，Na₂O=3.71%-4.21%).It belongs to shoshonite series with weak peraluminous (A/CNK=1.05-1.12) and low Mg index (Mg＃=9-16).The total amount of rare earth elements is relatively high (∑REE=317.72×10^-6 -371.30×10^-6).Light and weight lanthanon differentiation evidence(LaN/YbN=1950-2280)is noticeable.Eu negative anomaly is weak(δEu=075-081).The trace elements Rb, Th, Zr and K enrichment, Nb,Ta and Sr obvious depletion, show the emblematical character of continent lithosphere.176Hf/177Hf from zircons range from 0.282,206 to 0.282,309, εHf(t) from-13.32 to-16.97, Hf model ages are 2.0-2.6 Ga, average is 2.2 Ga.The above characteristics indicate that the Early Cretaceous trachyte in the study area mainly came from Paleoproterozoic lithosphere partial melting and was formed in an extensional tectonic environment.

Key words: southern Jilin, Sankeyushu Formation, zircon U-Pb age；Hf isotope；Early Cretaceous, trachyte, extensional tectonic environment

DUO Zhen-Min- , CHEN Ti-Jun. Petrogenesis of Volcanic Rocks from Sankeyushu Formation in Southern Jilin: Evidences from Zircon U-Pb Ages and Hf Isotopes[J]. Geoscience, 2012, 26(4): 627-634.

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