Seafloor basalt alteration and chemical change in the ultra thinly sedimented South Pacific

Seafloor basalt alteration and chemical change in the ultra thinly sedimented South Pacific

Determining the relationship between ocean floor basalt alteration and sedimentation is fundamental to understanding how oceanic crust evolves with time. Ocean floor basalts recovered at IODP Sites U1365 (∼100 Ma) and U1368 (∼13.5 Ma) in the South Pacific have been subjected to remarkably low sedime...

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Veröffentlicht in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2014-07, Vol.15 (7), p.3066-3080
Hauptverfasser: Zhang, Guo-Liang, Smith-Duque, Christopher
Format: Artikel
Sprache:eng
Schlagworte:
Basalt
Chemical analysis
chemical change
Fluid flow
Geochemistry
hydrothermal alteration
Hydroxides
Insulation
Laminar flow
Lithology
Low temperature
Marine
Ocean bottom
Ocean floor
Oceanic crust
Oceanography
seafloor basalt alteration
Seawater
sediment blanketing
Sedimentary geology
Sedimentation rates
South Pacific
Titanium dioxide
vein
Water analysis
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Zusammenfassung:Determining the relationship between ocean floor basalt alteration and sedimentation is fundamental to understanding how oceanic crust evolves with time. Ocean floor basalts recovered at IODP Sites U1365 (∼100 Ma) and U1368 (∼13.5 Ma) in the South Pacific have been subjected to remarkably low sedimentation rates (0.71 and 1.1 m/Myr−1, respectively). We report detailed petrographic and geochemical analysis of basalt cores from these sites in order to investigate what impact sediment insulation has on seafloor alteration beyond 10–15 Myr of ocean crust formation. Both sites exhibit low‐temperature (
ISSN:1525-2027
1525-2027
DOI:10.1002/2013GC005141