关键词: 中条山, 辉绿岩岩墙群, 富集地幔, 部分熔融, 板内伸展环境

Abstract: Based on the petrographic and geochemical characteristics, petrogenesis of diabase dyke swarms in the southwestern area of Zhongtiao mountains can be discussed in three groups. The results show that the basaltic magma was derived from partial melting of an enriched mantle. Group 1 directly came from initial mantle magma and experienced a small amount of fractional crystallization of mafic minerals. Groups 2 and 3 were derived from a mixing of the mantle and the crust magmas, which experienced fractional crystallization of plagiocalse and Ti-Fe oxides. Compared with group 2, group 3 might undergo significantly crustal contamination and hydrothermal alteration. They were formed in the intraplate extensional environment, which might be related to the extension of the Xionger-Zhongtiao aulacogen.

Key words: Zhongtiao Mountains, diabase dyke swarms, enriched mantle, partial melting, intraplate extensional environment