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Geochemical Characteristics and Origin of Permian Basalts in Binchuan-Lijiang Area , Yunnan Province(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2008年第02期
Page:
130-138
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemical Characteristics and Origin of Permian Basalts in Binchuan-Lijiang Area , Yunnan Province
Author(s):
ZHU Shi-fei1QIN Yong1QIAN Zhuang-zhi2GAO Yan-qing 3
1. School o f Resources and Earth Sciences, China University o f Mining and Technology, Xuzhou 221008, Jiangsu, China; 2. School o f Earth Sciences and Resources, Changan University, Xian 710054, Shaanxi, China; 3. Department o f Airdrome Engineering, Air Academy o f Chinese Peoples Liberation Army, Xuzhou 221000, Jiangsu, China)
Keywords:
Binchuan-Lijiang Area continental flood basalts geochemistry mantle-plume tectonic setting
PACS:
P588.1
DOI:
-
Abstract:
Applying modern theory of petrology formation, this paper described the petrochemistry and geochemistry characteristics of basalts and its magma activation in Binchuan-Lijiang area of Yunnan Province. Basalts occurring in the area can be compositionally subdivided into three types: the high-Mg(the contents of MgO is from 12.3% to 27. 2%), the low-Mg(the contents of MgO is from 2.48% to 7.53%)and transitional- Mg(the contents of MgO is from 10. 4% to 11. 3%). All three types show progressive variation of petrochemistry property and are enriched in LREE and LILE. They exhibit geochemical features similar to oceanic island basalts and contribute to tholeiitic basalts. From geochemical diagrams, it is found that the Emeishan basalts representing major magmatic events were induced by deep-seated plumes. The magma derived from the mantle plume interacts with lithospheric materials, underwent different degrees of mixing of lithospheric mantle and crustal components, and forms a variety of basalts.

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Last Update: 2008-06-20