| Geochemical Characteristics of Danfeng Meta-Volcanic Rocks in Shangzhou Area,Shaanxi Province |
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| 摘 要： | The Danfeng meta-volcanics in the Shangzhou area, Shaanxi Province are characterized by oceanic island arc volcanic geochemistry. They are a suite of low-K tholeiitic series and calc-alkaline series meta-volcanic rocks derived from different sources respectively.These meta-volcanics have high Th/Ta ratios and low contents of Ni,Ta,Ti,Y and Yb, suggesting that they were influenced by the subduction zone components.Many lines of evidence show that the Danfeng meta-volcanics were produced in an oceanic island are setting of the supra-subduction zone at the southern margin of the North China Block during the Early Paleozoic.
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| 关 键 词： | 陕西 地球化学特征 火山岩 海洋岛 弧形构造 |
Geochemical characteristics of Danfeng meta-volcanic rocks in Shangzhou area,Shaanxi Province |
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| Authors: | Zhang Chengli Zhou Dingwu Han Song W R Fitches C J N Fletcher |
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| Institution: | (1) Department of Geology, Northwest University, 710069 Xi’an, China;(2) Institute of High Energy Physics, Chinese Academy of Sciences, 100039 Beijing, China;(3) Institute of Earth Studies, University of Wales, SY23 3DB Aberystwyth, Dyfed, Wales, UK;(4) British Geological Survey, Bryn Eithyn Hall, SY23 4BP Aberystwyth, Dyfed, Wales, UK |
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| Abstract: | The Danfeng meta-volcanics in the Shangzhou area, Shaanxi Province are characterized by oceanic island arc volcanic geochemistry.
They are a suite of low-K tholeiitic series and calc-alkaline series meta-volcanic rocks derived from different sources respectively.
These meta-volcanics have high Th/Ta ratios and low contents of Ni, Ta, Ti, Y and Yb, suggesting that they were influenced
by the subduction zone components. Many lines of evidence show that the Danfeng meta-volcanics were produced in an oceanic
island are setting of the supra-subduction zone at the southern margin of the North China Block during the Early Paleozoic.
This project was funded by the National Natural Science Foundation of China. |
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| Keywords: | Shaanxi Danfeng meta-volcanics geochemistry oceanic island arc setting |
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