scholarly journals ReversePetrogen : A Multiphase Dry Reverse Fractional Crystallization‐Mantle Melting Thermobarometer Applied to 13,589 Mid‐Ocean Ridge Basalt Glasses

2021 ◽  
Vol 126 (8) ◽  
Author(s):  
S. Brown Krein ◽  
Z. J. Molitor ◽  
T. L. Grove
Keyword(s):  
Fractional Crystallization ◽  
Mantle Melting ◽  
Ridge Basalt ◽  
Mid Ocean Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

Oxidation states of mid-ocean ridge basalt glasses

1986 ◽  
Vol 79 (3-4) ◽  
pp. 397-411 ◽  
Author(s):  
David M. Christie ◽  
Ian S.E. Carmichael ◽  
Charles H. Langmuir
Keyword(s):  
Oxidation States ◽  
Ridge Basalt ◽  
Mid Ocean Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

K, U and Th in mid-ocean ridge basalt glasses and heat production, K/U and K/Rb in the mantle

Nature ◽  
1983 ◽  
Vol 306 (5942) ◽  
pp. 431-436 ◽  
Author(s):  
K. P. Jochum ◽  
A. W. Hofmann ◽  
E. Ito ◽  
H. M. Seufert ◽  
W. M. White
Keyword(s):  
Heat Production ◽  
Ridge Basalt ◽  
Mid Ocean Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

scholarly journals Evidence from10Be and U series disequilibria on the possible contamination of mid-ocean ridge basalt glasses by sedimentary material

2000 ◽  
Vol 1 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
B. Bourdon ◽  
S. J. Goldstein ◽  
D. Bourlès ◽  
M. T. Murrell ◽  
C. H. Langmuir
Keyword(s):  
Ridge Basalt ◽  
Mid Ocean Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

U–Pb, Sm–Nd and Rb–Sr systematics of mid-ocean ridge basalt glasses

Nature ◽  
1980 ◽  
Vol 283 (5743) ◽  
pp. 149-153 ◽  
Author(s):  
R. S. Cohen ◽  
N. M. Evensen ◽  
P. J. Hamilton ◽  
R. K. O'Nions
Keyword(s):  
Ridge Basalt ◽  
Mid Ocean Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

Methane and hydrogen in mid-ocean-ridge basalt glasses: analysis by vacuum crushing

1988 ◽  
Vol 25 (1) ◽  
pp. 38-48 ◽  
Author(s):  
J. A. Welhan
Keyword(s):  
High Temperature ◽  
Gas Adsorption ◽  
Hydraulic Press ◽  
Hydrothermal Fluids ◽  
Rock Powder ◽  
Ridge Basalt ◽  
Metal Metal ◽  
Mid Ocean Ridge ◽  
Basalt Glasses ◽  
Ocean Ridge

A comparative study of vacuum crushing methods for analyzing reactive gases in basaltic glasses shows that ball milling is an efficient means of releasing occluded gases but that blank production represents a potentially serious problem that must be accounted for when determining reactive-gas compositions. Production of H2 and CH4 in a stainless-steel ball mill in the absence of rock material increases with length of crushing time. However, test results presented here indicate that blank levels are reduced during the actual crushing process by the presence of rock powder, which may act as a cushion to reduce metal–metal contact. Crushing in copper tubes under a hydraulic press produces no blanks for these gases, but crushing efficiency and gas release are very low, and gas adsorption on rock powder becomes a significant problem. Experiments with methane adsorption on crushed basalt suggest that the loss of methane is a chemisorption process that is, for the most part, irreversible.Applying corrections for these effects, we find that H2/CH4 ratios (~3 – 30) in mid-ocean-ridge basalt glasses are similar to those seen in high-temperature mid-ocean-ridge hydrothermal fluids. These data, arguments based on the similarity of water/rock mass ratios calculated from basalt gas data, and the uniformity of methane/helium ratios in divers high-temperature mid-ocean-ridge hydrothermal fluids support the contention that dissolved CH4 and H2 in these fluids are predominantly derived from leaching of mid-ocean-ridge basalt.

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.

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