Graduate Thesis Or Dissertation
 

Analysis of fourteen trace elements in Saudi Arabian layered gabbros by radiochemical neutron activation analysis

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  • Eight layered gabbro samples from two layered complexes, two xenoliths, one basalt from a hot brine area and a standard basalt rock (BCR-1) were analyzed by RNAA (radiochemical neutron activation analysis) for 14 trace elements, Au, Ni, Co, Ag, Sb, Se, Zn, In, T1, Rb, Cs, U, Ba and Sr. All samples were obtained from the Saudi Arabian region of the Red Sea except the standard rock. The two gabbro series, one of Miocene Age (Jabal at Turf, JT) and the other of Precambrian Age (Jabal Shayi, JS), showed no consistent variation of trace elements relative to stratigraphic positions in the layered series. The mean values for the elements in these gabbros are very similar to oceanic tholeiites indicating that these gabbros most likely originated from a magma similar to that which produces oceanic theoleiites. There are however large variations in trace elemental abundances between individual samples of similar bulk chemistry indicating that these elements are very sensitive to subtle chemical changes. Trace elemental abundances are quite different for the JT chill zone sample compared to the JT gabbro layers. Two different types of xenoliths were examined. The JT xenolith was mainly olivine with some pyroxene and belonged to the lherzolite group. It was found to be high in Co and Ni and low in Ba, Cs, Rb and Sr abundances with respect to the gabbros. The JH (Jabal Haylah) xenolith is a websterite and consists mainly of clinopyroxene and orthopyroxene. It is lower in Co and Ni abundances compared to the JT xenolith and is probably upper crust material. The HBA (hot brine area) basalt analyzed in this study is strongly enriched in the chalcophile elements, Ag, Sb, Se, Zn and T1, and weakly enriched in Au. This phenomenon may be attributed to hydrothermal alteration.
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