祁连造山带中部拉脊山古地幔特征及其归属: 来自基性火山岩的地球化学证据

侯青叶; 张宏飞; 张本仁; 赵志丹; 朱云海

Volume 30 Issue 1

Jan. 2005

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Article Navigation > Earth Science > 2005 > 30(1): 61-70

HOU Qing-ye, ZHANG Hong-fei, ZHANG Ben-ren, ZHAO Zhi-dan, ZHU Yun-hai, 2005. Characteristics and Tectonic Affinity of Lajishan Paleo-Mantle in Qilian Orogenic Belt: A Geochemical Study of Basalts. Earth Science, 30(1): 61-70.

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Characteristics and Tectonic Affinity of Lajishan Paleo-Mantle in Qilian Orogenic Belt: A Geochemical Study of Basalts

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China

Received Date: 2004-11-11
Publish Date: 2005-01-25

Abstract

Abstract

The Early Paleozoic Lajishan volcanic rock belt is located in the middle part of the Qilian orogenic belt. In order to reveal the mantle nature and tectonic affinity of the Lajishan belt, this paper presents a study of the major-trace elements and Pb-Sr-Nd isotopes of the Lajishan basalts. Based on major and trace elemental data, the Lajishan basalts can be divided into two groups: continental alkaline basalts (Group Ⅰ) and tholeiites basalts (Group Ⅱ). Group Ⅰ displays LREE enrichment, distinct Nb and Ta negative anomalies and negligible Zr and Hf anomalies. Group Ⅱ is characterized by typical OIB basalts with LREE enrichment and no Nb, Ta, Zr and Hf anomalies. The formation of Group Ⅱ is related to mantle plume. Sr-Nd-Pb isotopic compositions of basalts indicate that both Group Ⅰ and Group Ⅱ were derived from a mixing source between DM and EMⅡ mantle end-members, and have Dupal Pb isotope anomaly. A regional comparison shows that the high radiogenic Pb isotopic composition of the Lajishan basalts is similar to that of the Yangtze block mantle, and is distinctly from that of the North China mantle. This implies that the Lajishan paleo-mantle has an affinity to the Yangtze mantle instead of a part of the south margin of the North China block.
- basalt,
- geochemistry,
- continental rift,
- Lajishan,
- Qilian orogenic belt

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Characteristics and Tectonic Affinity of Lajishan Paleo-Mantle in Qilian Orogenic Belt: A Geochemical Study of Basalts

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