Mixing of magmas from enriched and depleted mantle sources in the northeast Pacific: West Valley segment, Juan de Fuca Ridge
Article Abstract:
The trace element composition of the basalts of the West Valley floor of the Juan de Fuca Ridge, in the northeast Pacific is a mixture of highly depleted normal mid-ocean ridge basalt (MORB) and enriched MORB. Mixing of the magma occurred at both the crustal and deeper levels. The depleted MORB is probably the result of a melting event beneath a surrounding part of the Juan de Fuca Ridge and is represented by basalts from the Heck Seamounts. The enriched MORB is represented by basalts from the Southwest Seamount and possibly the Tuzo Wilson Volcanic Field and may have originated as amphibole-bearing peridotite lumps floating in depleted mantle matrix.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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Geochemistry of lavas from Mohns Ridge, Norwegian-Greenland Sea: implications for melting conditions and magma sources near Jan Mayen
Article Abstract:
The Mohns Ridge lavas are present north of Jan Mayen Island in the Norwegian-Greenland Sea and have heterogeneous mantle that includes alkali basalts and incompatible-element-depletion tholeiites. At 72 degrees N, the low melting point melts contain three lava types with variable incompatible element compositions. Large and small degree melts from an enriched source combined to form the lava types. The Jan Mayen mantle probably originated from the passive upwelling of volatile-rich mantle. Large amounts of Ba and Rb are present in the Mohns Ridge basalt and the alkali basalts of Jan Mayen.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Mechanisms of Mg-phyllosilicate formation in a hydrothermal system at a sedimented ridge (Middle Valley, Juan de Fuca)
Article Abstract:
The mechanisms of Mg-phyllosilicate formation in a hydrothermal system at a sedimented ridge, Middle Valley, Juan de Fuca, provide vital information on fluid pathways and the movement of chemical elements. The precipitation of minerals depends on the permeability, fluid chemistry and temperature. Details of the geochemical and mineralogical study of the hydrothermal system are given.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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