ΔNb and the role of magma mixing at the East Pacific Rise and Iceland

2007 ◽  
pp. 413-449 ◽  
Author(s):  
James H. Natland
Keyword(s):  
Magma Mixing ◽  
East Pacific Rise ◽  
East Pacific

Primitive intratransform volcanism at Garrett Transform Fault (East Pacific Rise)

1997 ◽  
Vol 34 (8) ◽  
pp. 1101-1117 ◽  
Author(s):  
R. Hébert ◽  
R. Hekinian ◽  
D. Bideau
Keyword(s):  
Magma Mixing ◽  
East Pacific Rise ◽  
Source Region ◽  
Mineral Chemistry ◽  
Oscillatory Zoning ◽  
Chromian Spinel ◽  
Transform Fault ◽  
East Pacific ◽  
Simply Connected ◽  
Ocean Ridge

The paper presents the results of a petrological study of samples collected by submersible from volcanic features that floor the intratransform domain of the Garrett Transform Fault. Most intratransform volcanics are typically highly porphyritic and primitive mid-ocean ridge basalt (MORB) (glasses have Mg# higher than 0.65), whereas most volcanics close to the East Pacific Rise – transform intersection zone are nearly aphyric evolved MORB (glasses have Mg# lower than 0.54). In the intratransform volcanics, phenocrysts and megacrysts are plagioclase and olivine and accessory spinel microphenocrysts in the magnesian lavas, and clinopyroxene and plagioclase in ferrobasalts. Variable mineral chemistry of plagioclase and spinel, chemical disequilibria between these phases and surrounding glass, and resorption features and oscillatory zoning in plagioclase suggest that limited magma mixing occurred during genesis of intratransform MORB. Aluminous- to chromian-spinel compositions are in agreement with melt interactions in small magma pockets. These processes are superimposed on complex partial melting events of a heterogeneous source region underlying the intratransform domain. Generation of most ferrobasalts can be explained by crystal fractionation of primitive MORB. Some ferrobasalts appear to derive from discrete magma bodies, since they are not simply connected to the magnesian tholeiites through fractional crystallization processes.

Magma mixing in upper mantle: Evidence from high Mg# olivine hosted melt inclusions in MORBs near East Pacific Rise 13°N

2010 ◽  
Vol 55 (16) ◽  
pp. 1643-1656 ◽  
Author(s):  
GuoLiang Zhang ◽  
ShaoQing Jiang ◽  
HeGen Ouyang ◽  
DaiGeng Chen ◽  
XueBo Yin ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Melt Inclusions ◽  
Near East ◽  
Magma Mixing ◽  
East Pacific Rise ◽  
East Pacific

scholarly journals Role of suspended particulate matter in governing dissolved Nd in the Southern East Pacific Rise hydrothermal plume

2021 ◽  
Author(s):  
Chandranath Basak ◽  
Yingzhe Wu ◽  
Brian Haley ◽  
Jesse Muratli ◽  
Leopoldo Pena ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Suspended Particulate Matter ◽  
East Pacific Rise ◽  
Hydrothermal Plume ◽  
East Pacific ◽  
Suspended Particulate

Detailed geological mapping by submersible of the East Pacific Rise axial graben near 13°N

1986 ◽  
Vol 78 (2-3) ◽  
pp. 224-236 ◽  
Author(s):  
P. Gente ◽  
J.M. Auzende ◽  
V. Renard ◽  
Y. Fouquet ◽  
D. Bideau
Keyword(s):  
East Pacific Rise ◽  
Geological Mapping ◽  
East Pacific

Axial volcanism on the East Pacific Rise, 10–12°N

1989 ◽  
Vol 42 (1) ◽  
pp. 181-200 ◽  
Author(s):  
G. Thompson ◽  
W. B. Bryan ◽  
S. E. Humphris
Keyword(s):  
East Pacific Rise ◽  
East Pacific

Geochemistry of a hydrothermal sediment core from the OBS vent-field, 21°N East Pacific Rise

1999 ◽  
Vol 155 (1-2) ◽  
pp. 65-75 ◽  
Author(s):  
C.R. German ◽  
J. Hergt ◽  
M.R. Palmer ◽  
J.M. Edmond
Keyword(s):  
Sediment Core ◽  
East Pacific Rise ◽  
East Pacific ◽  
Hydrothermal Sediment
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