岩浆过程对玄武岩铁氧化状态和氧逸度的影响: 以雷琼地区晚新生代玄武岩为例

韩江伟; 熊小林; 朱照宇; 王强

Volume 34 Issue 1

Jan. 2009

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Article Navigation > Earth Science > 2009 > 34(1): 127-136

HAN Jiang-wei, XIONG Xiao-lin, ZHU Zhao-yu, WANG Qiang, 2009. Effect of Magmatic Processes on Fe Oxidation State and of Basaltic Melts: A Case Study for Late Cenozoic Basalts from the Leiqiong Area, South China. Earth Science, 34(1): 127-136.

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Effect of Magmatic Processes on Fe Oxidation State and of Basaltic Melts: A Case Study for Late Cenozoic Basalts from the Leiqiong Area, South China

1.
Guang zhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 2008-10-11
Publish Date: 2009-01-25

Abstract

Abstract

The major element composition of late Cenozoic basalts from Leiqiong area,South China is analyzed by wet chemical method. Coupled with some previous data,Fe³⁺/∑Fe ratios of these basalts can be divided into two groups,0.20-0.35 (named as normal samples) and 0.45-0.66 (named as abnormal samples). The oxygen fugacity in the basalt formation is calculated by the empirical equation which linked fO₂ to Fe₂O₃/FeO. The relative fO₂ of normal samples are about FMQ+1.1 to FMQ+2.4,slight higher than that of the mantle xenoliths found by previous researchers (FMQ-0.943 to FMQ+ 1.235). The difference may be attributed to the calculation methods,but the relative fO₂ of abnormal samples are around FMQ+3.3 to FMQ+4.8,2log units higher than that of their source region,and that difference can not be explained in the same way as above. Through discussing the effect of magmatic processes on fO₂,it indicates fractional crystallization,degassing and oxygen exchange between ascending melts and crust material and lithospheric material can not result in so large fO₂ and high Fe³⁺/∑Fe ratio in abnormal samples. Many abnormal samples collected from craters and the vicinity of craters are always related to unusual high Fe³⁺/∑Fe ratios. Thus we believe that the local structure resetting in lavas due to slowly cooling rate,which will oxidize Fe^2+ to a smaller Fe³⁺ ion for size consideration during the densification process,has led to elevated Fe³⁺/∑Fe ratios of the basaltic melts. One important conclusion is: to estimate the intrinsic fO₂ of the source region from which the basalts derived by Fe oxidation state of these basalts,sampling should be cautious and samples far away from the craters should be selected.
- magmatic process,
- basalts,
- Fe oxidation state,
- oxygen fugacity,
- Leiqiong area

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Effect of Magmatic Processes on Fe Oxidation State and of Basaltic Melts: A Case Study for Late Cenozoic Basalts from the Leiqiong Area, South China

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