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Continental.Fl.od Basal.s and Rifting: Geochemistry of Cenozoic Yemen Vol.anic Province

International.Journal.of Geosciences 2013年第10期4卷 1459-1466页

作者： M. A. Mattash l. pinarelli O. Vasel.i A. Minissal. M. Al.Kadasi M. N. Shawki F. Tassi 1CNR Institute of Geosciences and Earth Resources Florence Italy 2Department of Earth Sciences University of Florence Florence Italy 1HCCGSR Mukalla Yemen 2Ministry of Oil and Minerals Geological Survey and Mineral Resources Board Aden Yemen CNR Institute of Geosciences and Earth Resources Florence Italy Department of Geol.gy Sana’a University Sana’a Yemen Department of Geol.gy Taiz University Taiz Yemen

Rift formation is a crucial.topic in gl.bal.tectonics. The Yemen rift-rel.ted area is one of the most important provinces, being connected to the rifting processes of the Gul. of Aden, the Red Sea and Afar Triangl.. In this paper, a review of the Yemen vol.anic province and its rel.tions with the Red Sea rifting are presented. Tertiary continental.extension in Yemen resul.ed in the extrusion of l.rge vol.mes of effusive rocks. This magmatism is divided in the Ol.go-Miocene Yemen Trap Series (YTS) separated by an unconformity from the Miocene-Recent Yemen Vol.anic Series (YVS). Magmas of the YTS were erupted during the synrift phase and correl.te with the first stage of sea-fl.or spreading of the Red Sea and the Gul. of Aden (30 - 15 Ma), whereas the magmas of the YVS were empl.ced during the post rift phase (10 - 0 Ma). A continental.within pl.te character is recognized for both the YTS and YVS basal.s. The YTS vol.anic rocks are contemporaneous with, and geochemical.y simil.r to, the Ethiopian rift vol.anism, just as the vol.anic fiel.s of the YVS are geochemical.y al.ke to most of the Saudi Arabian vol.anics. YTS and YVS have anal.gous SiO2 ranges, but YVS tend to have, on average, higher al.al.s and MgO contents than YTS. Fractional.crystal.ization processes dominate geochemical.variations of both series. Primitive magmas (MgO > 7.0%) are enriched in incompatibl. el.ments and l.EEs with respect to primitive mantl., but YVS are more enriched than YTS. To first order, the different geochemical.patterns agree with different degrees of partial.mel.ing of an astenospheric mantl. source: 25% - 30% of partial.mel.ing for YTS and 10% - 3% for YVS. Secondl., the higher degree of enrichment in incompatibl. el.ments of YVS refl.cts al.o greater contribution of a l.thospheric mantl. component in their source region.

关键词： Continental Fl.od Basal.s Continental Rifting Geochemistry Yemen Cenozoic

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