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Chracteristic and Tectonic Significance of Intermediate-Acid Intrusive Rock in Wujinxia Area of Baiyin City(PDF)

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

Issue:
2008年第03期
Page:
240-
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Chracteristic and Tectonic Significance of Intermediate-Acid Intrusive Rock in Wujinxia Area of Baiyin City
Author(s):
LIANG Zhi-lu1; WANG Yun-bin2; LIU Hong-lun3; KANG Sheng-song4
1+M45. Third Institute o f Exploration, Gansu Geologic and Mineral Bureau, Lanzhou 730000, Gansu, China; 2. Northwestern Non ferrous Metals Geological Institute, Xian 710054, Shaanxi, China; 3. Yunnan Geology and Mineral Resources Limited Company, Kunming, 671000, Yunnan, China; 4. School o f Earth Sciences and Resources, Changan University, Xian 710054, Shaanxi, China
Keywords:
Wujinxia area;  Baiyin City;  intermediate-acid intrusive;  Central Qilian massif;  geological characteristic;  tectonic significance;  geochemistry rock;  Gansu Province
PACS:
P534.45
DOI:
-
Abstract:
Through the geological, petrochemical and geochemical research on intermediate acid intrusive rock located in Wujinxia area of Baiyin City in Gansu Province, it is found that w(Na2O)are high, meanwhile, w(MgO), w(TFeO), w(Al2O3)and w(K2O)are low,w(TiO2),w(MgO),w(MnO),w(TFeO),w(CaO),w(K2O)and w(SiO2)are negative correlated, w(Na2O) and w(SiO2) are positive correlated, LREE and HREE are differentiated, LREEs are more obviously enriched,andδ(Eu)are depleted, large ion lithophile elements such as Ba, Th,Sr are enriched, Rb and Li are poor. The temperature of magmatic crystallization is from 700 ℃ to 890 ℃ . The intrusinve body was the product of comagmatic evolution during the mutual interaction of Central Qilian massif and Qilian ocean in the island-arc tectonic environment of middle-to later Ordovician period.

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Last Update: 2008-09-20