Veining and alteration in rocks from the Louisville Seamount Chain - consequences for crust-seawater exchange budgets
Final Report Abstract
The carbonate and zeolite archive in the Louisville seamount chain provides new insights into the complex multi-stage seawater-basement exchange during ageing of the seamount basement. Our data indicate a pivotal role of temperature and volcanic facies in mediating the intensity of exchange between basement and circulating seawater. Some of the seamounts appear to have acted as recharge site of seawater. There, seawater-basement exchange is minimal and paleo-seawater compositions can be reconstructed. The data corroborate the low Mg/Ca ratios proposed by earlier work for the Paleogene. Carbonate veins for other seamounts, however, show evidence for enhanced seawater-basement exchange. The intensity of that exchange does not permit reconstrcutions of seawater composition. Ages for these carbonates cannot be established. The PI continues to work with the dataset and U/Pb age dating is ongoing.
Publications
-
(2013) Carbonate and zeolite from the Louisville Seamount chain as indicators of changing fluid-rock interaction. DMG-Meeting Tübingen
Rausch S, Bach W, Klügel A
-
(2013) Carbonate veining in rocks from the Louisville Seamount Chain. ICDP/IODP Meeting in Freiberg
Rausch S, Bach W, Klügel A
-
(2014) Carbonates and zeolites in seamounts trace seawaterbasement interactions: Results from IODP Expedition 330, Louisville Seamount Chain. ICDP/IODP Meeting in Erlangen
Rausch S, Bach W, Klügel A
