NDLI: Helium and argon isotopes of the Tertiary basic igneous rocks from Shandong Peninsula and implications for the magma origin

Content Provider	Springer Nature Link
Author	Tang, HuaYun Zheng, JianPing Chen, HongHan Ye, XianRen
Copyright Year	2007
Abstract	Helium (He) and Argon (Ar) isotopic compositions of the Tertiary basic igneous rocks were determined by the high temperature melting extraction method. The selected samples for the studies included alkaline basalts and diabases from the Jiyang basin, and the surrounding Shanwang and Qixia outcrops in the Shandong Peninsula, eastern China. The results show that the Paleogene basalts and diabases from the Jiyang basin yielded a wide range of $^{4}$He abundance of (73.70–804.16)×10$^{−8}$ cm$^{3}$ STP·g$^{−1}$, with $^{3}$He/$^{4}$He ratios of 0.374–2.959 Ra, which was lower than the MORB but evidently higher than the continental crust value. The Neogene alkaline basalts from the Jiyang basin, Shanwang and Qixia outcrops have variable $^{4}$He abundances ((42.34−286.72)×10$^{−8}$ cm$^{3}$ STP·g$^{−1}$), and “continental crust-like” $^{3}$He/$^{4}$He ratios (0.013−0.074 Ra). All of them contain atmospheric-like $^{40}$Ar/$^{36}$Ar ratio (395.4–1312.7), reflecting the mantle sources with air components. Their low $^{3}$He/$^{4}$He ratios are interpreted as the enrichment of the radiogenic $^{4}$He mainly inherited from the mantle. He and Ar systematics show the mixing of MORB-type, air and a $^{4}$He enriched member in the mantle source, suggesting that these igneous rocks originated from the depleted asthenospheric mantle mixed with an EMI component. Therefore, the present He and Ar isotopes do not support the viewpoints that the Cenozoic igneous rocks of Eastern North China were the products of mantle plume(s) activities.
Starting Page	1021
Ending Page	1032
Page Count	12
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	50
Issue Number	7
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	He and Ar isotopes Tertiary basic igneous rocks mantle sources asthenosphere Shandong Peninsula Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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