scholarly journals Crystallization pressures of mid-ocean ridge basalts derived from major element variations of glasses from equilibrium and fractional crystallization experiments

2007 ◽  
Vol 112 (B1) ◽  
Author(s):  
Samuel Villiger ◽  
Othmar Müntener ◽  
Peter Ulmer
Keyword(s):  
Fractional Crystallization ◽  
Major Element ◽  
Mid Ocean Ridge ◽  
Crystallization Experiments ◽  
Ocean Ridge

scholarly journals Lithogeochemistry of the Mid-Ocean Ridge Basalts near the Fossil Ridge of the Southwest Sub-Basin, South China Sea

Minerals ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 465 ◽  
Author(s):  
Kai Sun ◽  
Tao Wu ◽  
Xuesong Liu ◽  
Xue-Gang Chen ◽  
Chun-Feng Li
Keyword(s):  
South China Sea ◽  
Partial Melting ◽  
Fractional Crystallization ◽  
South China ◽  
Spreading Rate ◽  
Tholeiitic Basalt ◽  
Spinel Peridotite ◽  
China Sea ◽  
Mid Ocean Ridge ◽  
Ocean Ridge

Mid-ocean ridge basalts (MORB) in the South China Sea (SCS) record deep crust-mantle processes during seafloor spreading. We conducted a petrological and geochemical study on the MORBs obtained from the southwest sub-basin of the SCS at site U1433 and U1434 of the International Ocean Discovery Program (IODP) Expedition 349. Results show that MORBs at IODP site U1433 and U1434 are unaffected by seawater alteration, and all U1433 and the bulk of U1434 rocks belong to the sub-alkaline low-potassium tholeiitic basalt series. Samples collected from site U1433 and U1434 are enriched mid-ocean ridge basalts (E-MORBs), and the U1434 basalts are more enriched in incompatible elements than the U1433 samples. The SCS MORBs have mainly undergone the fractional crystallization of olivine, accompanied by the relatively weak fractional crystallization of plagioclase and clinopyroxene during magma evolution. The magma of both sites might be mainly produced by the high-degree partial melting of spinel peridotite at low pressures. The degree of partial melting at site U1434 was lower than at U1433, ascribed to the relatively lower spreading rate. The magmatic source of the southwest sub-basin basalts may be contaminated by lower continental crust and contributed by recycled oceanic crust component during the opening of the SCS.

scholarly journals Fractional crystallization causes the iron isotope contrast between mid-ocean ridge basalts and abyssal peridotites

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Yanhong Chen ◽  
Yaoling Niu ◽  
Meng Duan ◽  
Hongmei Gong ◽  
Pengyuan Guo
Keyword(s):  
Fractional Crystallization ◽  
Trace Element Geochemistry ◽  
Iron Isotope ◽  
Element Geochemistry ◽  
Mid Ocean Ridge ◽  
Atlantis Bank ◽  
The Indian Ocean ◽  
Ocean Ridge ◽  
Melt Evolution

AbstractThe iron isotope contrast between mid-ocean ridge basalts and abyssal peridotites is far greater than can be explained by mantle melting alone. Here we investigate a suite of mid-ocean ridge magma chamber rocks sampled by the Ocean Drilling Project Hole 735B in the Atlantis Bank of the Indian Ocean. We report major and trace element geochemistry from these rocks and measure their iron isotope compositions to investigate the potential role of fractional crystallization during melt evolution. We observe a large range of δ56Fe that defines a significant inverse curvilinear correlation with bulk rock MgO/FeOT. These data confirm that δ56Fe in the melt increases as fractional crystallization proceeds but, contrary to expectation, δ56Fe continues to increase even when oxides begin to crystallize. We conclude that iron isotope fractionation through fractional crystallization during the evolution of mid-ocean ridge basalts from abyssal peridotites reconciles the disparity in isotopic compositions between these two lithologies.

scholarly journals Origins of Major Element, Trace Element, and Isotope Garnet Signatures in Mid‐Ocean Ridge Basalts

2020 ◽  
Vol 125 (12) ◽  
Author(s):  
Stephanie Brown Krein ◽  
Mark Dietrich Behn ◽  
Timothy Lynn Grove
Keyword(s):  
Trace Element ◽  
Major Element ◽  
Mid Ocean Ridge ◽  
Ocean Ridge
Sign in / Sign up

Export Citation Format

Share Document