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Hydrothermal fluid interaction in basaltic lava units, Kerguelen Archipelago (SW Indian Ocean)
- Source :
- European Journal of Mineralogy, European Journal of Mineralogy, Copernicus, 2010, 22 (2), pp.215-234. ⟨10.1127/0935-1221/2009/0022-1993⟩, European Journal of Mineralogy, 2010, 22 (2), pp.215-234. ⟨10.1127/0935-1221/2009/0022-1993⟩
- Publication Year :
- 2010
- Publisher :
- Schweizerbart, 2010.
-
Abstract
- Hydrothermally altered basaltic lava-units in the northern Kerguelen Archipelago contain a wide variety of secondary silicate and carbonate minerals, including zeolites, hydrothermal calcite, dolomite and magnesite, as well as celadonite, orthoclase (adularia) and quartz. Petrography, fluid-inclusion microthermometry, trace-elements geochemistry, Sr isotopes and stable-isotope compositions indicate hydrothermal fluid cells derived from meteoric water interacting with basalts and Rb-rich subvolcanic peralkaline rocks at temperatures ranging from 50 to 200 °C associated with the cooling of the lava pile. The calculated δ 18 O values of meteoric-hydrothermal waters in fossil hydrothermal systems are identical to those in present-day hot springs, suggesting that meteoric recharge was continuous throughout the igneous cooling cycles of the 28–23 Ma older host basalts and the younger 15–5 Ma old peralkaline intrusions. The Kerguelen northern coastline hydrothermal system in the basaltic pile demonstrates that much of the silicate mineralogy and almost all carbonate secondary minerals in altered basalts were derived from meteoric-hydrothermal fluids, rather than products of seawater interaction, or even magmatic-hydrothermal fluids associated with peralkaline intrusions.
- Subjects :
- 010504 meteorology & atmospheric sciences
[SDE.MCG]Environmental Sciences/Global Changes
Carbonate minerals
Geochemistry
stable isotopes
interaction
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
engineering.material
010502 geochemistry & geophysics
01 natural sciences
Peralkaline rock
Hydrothermal circulation
[SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry
Geochemistry and Petrology
Fluid inclusions
14. Life underwater
meteoric-hydrothermal alteration
[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology
Kerguelen basalt
[SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Basalt
Igneous rock
fluid inclusions
[SDU]Sciences of the Universe [physics]
[SDE]Environmental Sciences
Meteoric water
engineering
Celadonite
fluid–rock
Geology
Subjects
Details
- ISSN :
- 09351221
- Volume :
- 22
- Database :
- OpenAIRE
- Journal :
- European Journal of Mineralogy
- Accession number :
- edsair.doi.dedup.....60943df7324e2bf187925bd27d30ba50