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| Helium and argon isotopes of the Tertiary basic igneous rocks from Shandong Peninsula and implications for the magma origin | |
| 引用本文： | TANG HuaYun1,ZHENG JianPing1?,CHEN HongHan2 & YE XianRen3 1 State Key Laboratory of Geological Processes and Mineral Resources,Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China, 2 Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China, 3 State Key Laboratory of Gas Geochemistry,Institute of Geology and Geophysics,Chinese Academy of Sciences,Lanzhou 730000,China. Helium and argon isotopes of the Tertiary basic igneous rocks from Shandong Peninsula and implications for the magma origin[J]. 中国科学D辑(英文版), 2007, 50(7): 1021-1032. DOI: 10.1007/s11430-007-0067-z |
| 作者姓名： | TANG HuaYun1 ZHENG JianPing1? CHEN HongHan2 & YE XianRen3 1 State Key Laboratory of Geological Processes and Mineral Resources Faculty of Earth Sciences China University of Geosciences Wuhan 430074 China 2 Faculty of Earth Resources China University of Geosciences Wuhan 430074 China 3 State Key Laboratory of Gas Geochemistry Institute of Geology and Geophysics Chinese Academy of Sciences Lanzhou 730000 China |
| 作者单位： | TANG HuaYun1，ZHENG JianPing1?，CHEN HongHan2 & YE XianRen3 1 State Key Laboratory of Geological Processes and Mineral Resources，Faculty of Earth Sciences，China University of Geosciences，Wuhan 430074，China; 2 Faculty of Earth Resources，China University of Geosciences，Wuhan 430074，China; 3 State Key Laboratory of Gas Geochemistry，Institute of Geology and Geophysics，Chinese Academy of Sciences，Lanzhou 730000，China |
| 基金项目： | 国家自然科学基金;中国石化集团胜利油田地球物理研究所基础科研基金 |
| 摘 要： | 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 al-kaline 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 P4 PHe abundance of (73.70-804.16)×10 P-8 Pcm P3 P STP·g P-1 P,with P3 PHe/ P4 PHe ratios of 0.374-2.959 Ra,which was lower than the MORB but evidently higher than the con-tinental crust value. The Neogene alkaline basalts from the Jiyang basin,Shanwang and Qixia outcrops have variable P4 PHe abundances ((42.34-286.72)×10-8 Pcm P3 P STP·g-1 P),and "continental crust-like" P3 PHe/ P4 PHe ratios (0.013-0.074 Ra). All of them contain atmospheric-like P40 PAr/ P36 PAr ratio (395.4-1312.7),reflecting the mantle sources with air components. Their low P3 PHe/ P4 PHe ratios are interpreted as the enrichment of the radiogenic P4 PHe mainly inherited from the mantle. He and Ar systematics show the mixing of MORB-type,air and a P4 PHe 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. |
| 收稿时间： | 2006-10-17 |
| 修稿时间： | 2007-02-27 |
Helium and argon isotopes of the Tertiary basic igneous rocks from Shandong Peninsula and implications for the magma origin |
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| Tang HuaYun,Zheng JianPing,Chen HongHan,Ye XianRen. Helium and argon isotopes of the Tertiary basic igneous rocks from Shandong Peninsula and implications for the magma origin[J]. Science in China(Earth Sciences), 2007, 50(7): 1021-1032. DOI: 10.1007/s11430-007-0067-z | |
| Authors: | Tang HuaYun Zheng JianPing Chen HongHan Ye XianRen |
| Affiliation: | 1. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China 2. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China 3. State Key Laboratory of Gas Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sciences, Lanzhou 730000, China |
| 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 4He abundance of (73.70–804.16)×10−8 cm3 STP·g−1, with 3He/4He 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 4He abundances ((42.34−286.72)×10−8 cm3 STP·g−1), and “continental crust-like” 3He/4He ratios (0.013−0.074 Ra). All of them contain atmospheric-like 40Ar/36Ar ratio (395.4–1312.7), reflecting the mantle sources with air components. Their low 3He/4He ratios are interpreted as the enrichment of the radiogenic 4He mainly inherited from the mantle. He and Ar systematics show the mixing of MORB-type, air and a 4He 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. Supported by the National Natural Science Foundation of China (Grant No. 40425002) and the Major Basic Research Fund of the Geophysical Research Institute of Shengli Oilfield, SINOPEC |
| Keywords: | He and Ar isotopes Tertiary basic igneous rocks mantle sources asthenosphere Shandong Peninsula |
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