Magma generation on Mars constrained from an40Ar degassing model

1996 ◽  
Vol 101 (E3) ◽  
pp. 7543-7554 ◽  
Author(s):  
Eiichi Tajika ◽  
Sho Sasaki
Keyword(s):  
Magma Generation ◽  
Degassing Model

Magma generation processes and timescales leading to the great 1815 eruption of Tambora volcano, Sumbawa, Indonesia

2006 ◽  
Vol 70 (18) ◽  
pp. A648
Author(s):  
L.E. Thomas ◽  
R. Gertisser ◽  
S. Self ◽  
H.K. Handley
Keyword(s):  
Magma Generation

Mechanisms of Magma Generation Beneath Hawaii and Mid-Ocean Ridges: Uranium/Thorium and Samarium/Neodymium Isotopic Evidence

Science ◽  
1995 ◽  
Vol 267 (5197) ◽  
pp. 508-512 ◽  
Author(s):  
K. W. W. Sims ◽  
D. J. DePaolo ◽  
M. T. Murrell ◽  
W. S. Baldridge ◽  
S. J. Goldstein ◽  
...  
Keyword(s):  
Magma Generation ◽  
Isotopic Evidence ◽  
Ocean Ridges

Granite magma generation, ascent and emplacement within a transpressional orogen

1992 ◽  
Vol 149 (4) ◽  
pp. 487-490 ◽  
Author(s):  
R. S. D’LEMOS ◽  
M. BROWN ◽  
R. A. STRACHAN
Keyword(s):  
Magma Generation ◽  
Granite Magma

Whole-rock and mineral chemistry of cumulates from the Kızıldağ (Hatay) ophiolite (Turkey): clues for multiple magma generation during crustal accretion in the southern Neotethyan ocean

2005 ◽  
Vol 69 (1) ◽  
pp. 53-76 ◽  
Author(s):  
U. Bağci ◽  
O. Parlak ◽  
V. Höck
Keyword(s):  
Tectonic Setting ◽  
Mineral Chemistry ◽  
Chromian Spinel ◽  
Olivine Gabbro ◽  
Crustal Accretion ◽  
Magma Generation ◽  
The North ◽  
Rock Types ◽  
Suprasubduction Zone ◽  
Ocean Ridge

AbstractThe late Cretaceous Kızıldağ ophiolite forms one of the best exposures of oceanic lithospheric remnants of southern Neotethys to the north of the Arabian promontory in Turkey. The ultramafic to mafic cumulate rocks, displaying variable thickness (ranging from 165 to 700 m), are ductiley deformed, possibly in response to syn-magmatic extension during sea-floor spreading and characterized by wehrlite, olivine gabbro, olivine gabbronorite and gabbro. The gabbroic cumulates have an intrusive contact with the wehrlitic cumulates in some places. The crystallization order of the cumulus and intercumulus phases is olivine (Fo86–77)± chromian spinel, clinopyroxene (Mg#92–76), plagio-clase(An95–83), orthopyroxene(Mg#87–79). The olivine, clinopyroxene, orthopyroxene and plagioclase in ultramafic and mafic cumulate rocks seem to have similar compositional range. This suggests that these rocks cannot represent a simple crystal line of descent. Instead the overlapping ranges in mineral compositions in different rock types suggest multiple magma generation during crustal accretion for the Kızıldağ ophiolite. The presence of high Mg# of olivine, clinopyroxene, orthopyroxene, and the absence of Ca-rich plagioclase as an early fractionating phase co-precipitating with forsteritic olivine, suggest that the Kızıldağ plutonic suite is not likely to have originated in a mid-ocean ridge environment. Instead the whole-rock and mineral chemistry of the cumulates indicates their derivation from an island arc tholeiitic (IAT) magma. All the evidence indicates that the Kızıldağ ophiolite formed along a slow-spreading centre in a fore-arc region of a suprasubduction zone tectonic setting.

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