10 11 We measured the self-potential (SP) response to advective transport of KCl 12 concentration fronts through two laboratory-scale sand-bodies with different 13 mineralogical composition. In pure quartz sand, the amplitude and polarity of the SP 14 signals agreed with a previously published model. In sand containing 3 % potassic 15 feldspars and 1 % micas and clays, the shape of the SP respo...

The research of organoclays has been occurring for many years to develop and add value these inorganic materials several industrial applications, such as pollutant absorbers or impermeable plastics. organoclay applications are intrinsically related organo-modification the structure clays. This study shows preparation characterization produced by a nontronite type clay (calcic bentonite) from To...

The formation of peralkaline melts is generally recognized to be related to enrichment of the mantle in sodium or potassium during a metasomatic event that predated magma generation. The wide range in mineral assemblages, mineral compositions, and fluid compositions in peralkaline melts are, to a large extent, a function of the sodium/potassium content of these mantle-metasomatizing fluids, whi...

Clinopyroxene phenocrysts and microphenocrysts in potassic and sodic Eosen alkaline volcanic rocks from the northern Lahrud (NW Iran) record various stages in the crystallization and evolution history of the alkaline melt as well as its origin. The rock series hosting the clinopyroxene phenocrysts is phonolitic tephrite and tephritic phonolite composition. Theses rocks generally show porphyriti...

Our aim in this work is (1) to characterize mineralogically and geochemically the brown amphibole and other minerals filling millimetric veins in the Cóbdar metabasalts of the Betic ophiolites in southern Spain, and (2) to deduce their genetic conditions, mainly with the aid of the optical microscopy and analytical electron-microprobe analysis, complemented by transmission and analytical electr...