Contribution to the Petrography, Geochemistry, and Petrogenesis of Zarqa-Ma’in Pleistocene Alkali Olivine Basalt Flow of Central JordanReportar como inadecuado




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TheZarqa-Ma’in basalt MB occurs near a plateau basalt wadi fills coveringabout 15 km2 of Makawir, Ataruz, and Hammat um Hasana cone areas incentral Jordan. The tectonic evolution occurred through intraplate volcanismand erupted through fissure systems along the Dead Sea, transforming the faultduring Miocene to Pleistocene period. Three stages of eruption of MB have beenrecorded during Pleistocene from 6 to 0.6 Ma. The petrographic analyses datashow that the MB rocks are composed of plagioclase, olivine, pyroxene, andmagnetite, including secondary minerals calcite, iddingsite, serpentine, andzeolite. Furthermore, the MB rocks have narrow ranges of major and traceelement concentrations, and are of under saturated silica type and belong tosodic alkaline magma series. The geochemical characteristics of MB indicatethat MB was derived from a slightly fractionated magma as reflected by its highMgO 6.3 - 11.7 ppm concentration with Mg number from 0.41 to 0.61, low silicacontent 40.83 - 47.55 wt%, and high Cr and Ni concentrations 115 - 475 and105 - 553 ppm, respectively. This basalt exhibited low degree of partialmelting 10% for garnet peridotite mantle source. The model mineralfractionation showed that the MB could be fractionated to clinopyroxene,orthopyroxene, olivine, and plagioclase.

KEYWORDS

Alkali-Olivine Basalt, Fractionation, Batch Melting, Zarqa-Ma’in, Jordan

Cite this paper

Yaseen, I. 2014 Contribution to the Petrography, Geochemistry, and Petrogenesis of Zarqa-Ma’in Pleistocene Alkali Olivine Basalt Flow of Central Jordan. International Journal of Geosciences, 5, 657-672. doi: 10.4236-ijg.2014.56059.





Autor: Ibrahim Ahmad Ali Bany Yaseen

Fuente: http://www.scirp.org/



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