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Petrogenesis of Cenozoic potassic volcanic rocks in the Nangqen Basin

Acta Geologica Sinica(English Edition) 2001年第1期75卷 27-40页

作者： SUN Hongjuan DENG Wanming ZHANG Yuquan Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029 Guangzhou Institute of Geochemistry Chinese Academy of SciencesGuangzhou 51054

The Nangqên basin is one of the Tertiary pull-apart basins situated in the east of the Qiangtang block. Similar to the adjacent Dengqên basin and Baxoi basin, there occurred a series of potassic volcanic and sub-vol... 详细信息

关键词： potassic volcanic rocks Nangqên basin enriched mantle partialmelting underplating

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Petrogenesis of Cenozoic potassic volcanic rocks in the Nangqên Basin

Petrogenesis of Cenozoic Potassic Volcanic Rocks in the Nang...

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中国科学院地质与地球物理研究所2001学术年会

作者： SUN Hongjuan~1,DENG Wanming~1 and ZHANG Yuquan~2 1 Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029 2 Guangzhou Institute of Geochemistry,Chinese Academy of Sciences, Guangzhou 51054

The Nangqen basin is one of the Tertiary pull-apart basins situated in the east of the Qiangtang block. Similar to the adjacent Dengqen basin and Baxoi basin,there occurred a series of potassic volcanic and sub-volcanic rocks,ranging from basic,intermediate to intermediate-acid in lithology. Based on the study of petrology,mineralogy and geochemistry,including REEs,trace elements,isotopic elements and chronology,the authors concluded that the Cenozoic potassic volcanic rocks in the Nangqen basin were formed in the post-collisional intraplate tectonic *** relations between the basic,intermediate and intermediate-acid rocks are neither differentiation nor evolution,but instead the geochemical variability is mainly attributable to the different partial melting degrees of the mantle sources formed at depths of 50-80 km. The sources of the potassic rocks are enriched metasomatic mantle that has experienced multiple mixing of components mainly derived from the *** recycling model can be described as follows:after they had subducted to the mantle wedge,the crust-derived rocks were metasomatized with the mantle *** view of the fact that the ratio of crust-derived rocks increases by the age of volcanism,it can be concluded that the sources of the potassic rocks moved upwards progressively with time. The underplating of small scattered magmas upwelling from the asthenosphere may have induced partial melting of the sources of the volcanic rocks in some pull-apart basins in the Hengduanshan area and the intense tectonic movements of large-scale strike-slip belts provided conduits for the ascending melts.

关键词： potassic volcanic rocks Nangqen basin enriched mantle partialmelting underplating

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