GEOCHEMICAL FEATURES AND ORIGIN OF CONTINENTAL FLOOD BASALTS
Zhang Hongxiang
Xu Zhifang
Ma Yingjun
Liu Congqiang
Abstract：A close genetic relationship is present between the rapidly-upwelling continental flood basalts (CFB) and the continent rift. On the whole, the petrologic and geochemical compositions are homogeneous and enriched with isotopes and incompatible trace elements. However, some samples contain conspicuous depleted compositions, reflecting a general mantle heterogeneity. The mantle plume originating from upper/lower mantle boundary or asthenosphere might have served as the major materials and energies required for CFB that has not been fully assimilated by the crust. The metasomatism between the dehydrated fluid in the subduction zone or the thermal mantle plume itself and its wall rocks determines that the metasomatic lithosphere mantle with a great effect on the formation of CFB, is a major cause of the trace elements and isotope characteristics of CFB.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 261-268 )