Linking serpentinization, fluid fluxes mass transfer and microbial activity at Lost City; geochemical and isotopic constraints

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doi: 10.3929/ethz-a-005502496
Author(s): Delacour, Adélie
Source: Dissertationen, Eidgenössische Technische Hochschule Zürich, Vol.17198. Institution: Eidgenössische Technische Hochschule Zürich, Zurich, Switzerland. ISSN: 1012-8522
Note: In English with French summary. Doctoral dissertation
Summary: This study presents petrological, geochemical and isotopic (Sr, Nd, S and C) data on samples collected by submersible at the peridotite-dominated southern wall and drilled by the Integrated Ocean Drilling Program (IODP) at the gabbroic central dome (Site U1309) of the Atlantis Massif. The motivation of these studies is to understand lateral and vertical heterogeneities in crustal architecture, deformation, fluid fluxes, serpentinization and alteration conditions within the massif. The main goals of this thesis were: (1) to understand variations in conditions of serpentinization, and chemical and mineralogical changes accompanying crustal aecretion and alteration; (2) to quantify fluid-rock interaction and fluid-fluxes, and to determine their influence on the chemical compositions of the basement rocks; (3) to characterize the origin and evolution of volatiles in the peridotite hosted Lost City hydrothermal system; (4) to identify the linksks between serpentinization and microbial activity at Lost City; and (5) to compare the metamorphic and alteration conditions between the southern wall and the central dome of the massif.
Year of Publication: 2007
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 05 Petrology, Igneous and Metamorphic; Alkaline earth metals; Atlantic Ocean; Atlantis Massif; Carbon; Crust; Expeditions 304/305; Fluid dynamics; IODP Site U1309; Igneous rocks; Integrated Ocean Drilling Program; Isotopes; Lost City hydrothermal field; Mass transfer; Metals; Metamorphic core complexes; Metamorphism; Metasomatism; Microorganisms; Mid-Atlantic Ridge; Neodymium; North Atlantic; Oceanic crust; Peridotites; Plutonic rocks; Rare earths; Serpentinization; Strontium; Sulfur; Ultramafics; Volatiles; Water-rock interaction
Coordinates: N300000 N302000 W0420000 W0421500
Record ID: 2011031284
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.