Journal ArticleDOI
Sea floor basalt alteration: Some chemical and Sr isotopic effects
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TLDR
In this article, the major element, Sr isotope and trace element data for 16 elements are reported for various weathered zones in three submarine basalt pillows, and it appears that SiO2, Al2O3, CaO, S, and Ga are lost from the basalt during the initial stages of alteration.Abstract:
Major element, Sr isotope and trace element data for 16 elements are reported for various weathered zones in three submarine basalt pillows. During the initial stages of alteration, it appears that SiO2, Al2O3, CaO, S, and Ga are lost from the basalt, whereas Fe2O3, total Fe, MnO, K2O, H2O, Cl, B, Rb, and Cs increase. Sr87/Sr86 ratios also increase during weathering. MgO, Na2O, P2O5, Ba, Ni and Cu show significant (10–50%) but less consistent changes. TiO2, Zr, Sr and V show only minor changes (<7%). Zn, Cr, Co, Y and Nb show no changes outside experimental error.read more
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A method of discriminating between different types of mid-ocean ridge basalts and continental tholeiites with the Nb1bZr1bY diagram
TL;DR: In this paper, the immobile trace elements Nb, Zr and Y were used to distinguish between different types of mid-ocean ridge basalts (MORB) including N-type MORB, from normal midocean ridges and P-type, from plume-influenced regions).
Journal ArticleDOI
Geochemical magma type discrimination: application to altered and metamorphosed basic igneous rocks
TL;DR: In this article, five minor and trace elements, known to be chemically stable during alteration and metamorphism, have been combined in a set of binary diagrams that distinguish fresh tholeiites from alkali basalts.
Journal ArticleDOI
HfNdSr isotopes and incompatible element abundances in island arcs: implications for magma origins and crust-mantle evolution
TL;DR: In this article, Hf, Nd and Sr isotopic data and abundances of K, Rb, Cs, Ba, Sr, Hf and REE for 32 samples from seven intra-oceanic island arcs are presented.
Journal ArticleDOI
Variations in143Nd/144Nd and87Sr/86Sr ratios in oceanic basalts
TL;DR: In this article, a strong negative correlation exists between 87Sr/86Sr ratios in oceanic basalt from Iceland and the Reykjanes Ridge, but such a clear correlation does not exist for samples from the Hawaiian Islands.
Journal ArticleDOI
Petrogenesis of basalts from the FAMOUS area: Mid-Atlantic Ridge
TL;DR: In this article, it is suggested that the observed variations are a consequence of dynamic partial melting of a homogeneous mantle source region, which may be generated by processes in the mantle during melting.
References
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Journal ArticleDOI
Chemical Characteristics and Origin of Oceanic Ridge Volcanic Rocks
TL;DR: Oceanic ridge volcanic rocks alkali metal, alkaline earth, rare earth, nickel and major element content, observing partial melting as mentioned in this paper. But this is not the case for all volcanic rocks.
Journal ArticleDOI
Rb, Sr, Y, Zr and Nb in some ocean floor basaltic rocks
TL;DR: X-ray fluorescence measurements have been made of Rb, K and, to a lesser extent, Sr, Y, Zr and Nb in 35 samples of ocean floor basaltic rocks from four different areas of the oceans.
Journal ArticleDOI
Ophiolite origin investigated by discriminant analysis using Ti, Zr and Y
Julian A. Pearce,J.R. Cann +1 more
TL;DR: In this paper, samples of rocks from four known or suspected ophiolite complexes were compared with five groups of Cenozoic volcanic rocks using their contents of Ti, Zr and Y.
Journal ArticleDOI
Oxygen Isotope Studies of Fresh and Weathered Submarine Basalts
TL;DR: The 18O/16O ratios of fresh unmetamorphosed basalts from the Reykjanes, Mid-Atlantic, and Gorda Ridges and the East Pacific Rise fall in a narrow range of 5.5-5.9
Journal ArticleDOI
K, Rb, Cs contents and K/Rb, K/Cs ratios of fresh and altered submarine basalts
TL;DR: In this article, the authors show that the trend of decreasing K/Rb with increasing K content is a probable result of later alteration, both during low grade metamorphism and during exchange with sea water.
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