WebMay 16, 2013 · These low magnesian primary magmas might also be present in various types of basalts such as typical ... Yoder, H. S. & Tilley, C. E. Origin of basalt magmas: an experimental study of natural ... WebThere is convincing evidence that basalt magmas are derived by melting processes in the upper mantle. Basalt magmas are thus potentially an important source of information on the chemical and mineralogical constitution of the upper mantle. In the following sections, recent advances in our knowledge of the melting and fractionation behavior of natural …
Generation of continental intraplate alkali basalts and implications …
WebThe basaltic lavas erupted throughout the Mojave Desert are basanites (SiO2<46%, normative nepheline>5%, and K2O>1.5%), alkali-olivine basalts (SiO2=46–48%; ne=0–5%; and K2O=1.0–1.5%), and low-alumina, sub-alkaline basalts (SiO2=48–51%; ne=0; K2O<1.0%). One volcano, Pisgah Crater, erupted five times, with lava from each successive phase … WebSep 1, 2016 · Another question to be solved is the nature and provenance of pyroxenite in mantle source and its role in origin of basaltic magmas that fed intraplate ... Experimentally-determined continuous spectrum from tholeiitic to alkali melts can explain formation of primary magmas of basanites, alkali basalts and tholeiitic basalts as a ... robert o morton md
Primary magmas and the origin of basalts - wizdom.ai
WebThe compositions of the most Mg-rich Snake River Plain basalts are such that they may perhaps be primary magmas, ... Yoder, H.S., Jr., Tilley, C.E.: Origin of basalt magmas: an … WebApr 15, 1977 · Available NiO analyses of olivine in peridotites of probable mantle origin are consistent in giving values around 0.40 weight per cent. Assuming that basaltic magma forming from the mantle was in equilibrium with such peridotitic olivine, the NiO content of primary basaltic magmas is estimated to be about 0.030–0.050 weight per cent. WebJan 1, 1992 · Characterization of the mantle source regions of continental flood basalts (c.f.b.) is hampered by uncertainties regarding the extent of modification of the magmas … robert o mcwilliams