Microbes play an important role in the alteration of oceanic crust

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doi: 10.1016/0009-2541(95)00114-8
Author(s): Thorseth, I. H.; Torsvik, T.; Furnes, H.; Muehlenbachs, K.
Author Affiliation(s): Primary:
University of Bergen, Geological Institute, Bergen, Norway
Other:
Ecole Normale Supérieure de Lyon, France
University of Alberta, Department of Geology, Edmonton, AB T6G 2E3, Canada
Volume Title: Mantle-ocean connection
Volume Author(s): Staudigel, Hubert, editor; Albarède, Francis; Hilton, David; Elliott, Tim
Source: Chemical Geology, 126(2), p.137-146; The mantle-ocean connection, Amsterdam, Netherlands, Aug. 24-26, 1994, edited by Hubert Staudigel, Francis Albarède, David Hilton and Tim Elliott. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541 CODEN: CHGEAD
Note: In English. 39 refs.; illus., incl. 1 table
Summary: Microbes have been identified within altered parts of the glass rims of pillow lavas in the upper oceanic crust, 237 m below the top of the volcanic basement of ODP Hole 896A at the Costa Rica Rift. Their presence is verified by spherical and vermicular microbodies containing DNA. The elemental composition of the microbially processed areas differ from the parent glass. Further, the microbially processed parts, showing different morphological forms also show different elemental composition. Extreme K-enrichment indicate that microbes are presently active in the alteration process. The carbon isotopic composition of disseminated carbonates within the basaltic section of the Hole 504B (1 km distance from Hole 896A) also give evidence for microbial activity during rock alteration. The δ13C values of most of these trace carbonates are very low, reflecting metabolic control of the carbon cycle in these rocks. Microbial alteration of basaltic glass, comprising a substantial volume and surface area of the upper oceanic crust, may thus play an important role in the element exchange between oceanic crust and seawater. Abstract Copyright (1995) Elsevier, B.V.
Year of Publication: 1995
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 05 Petrology, Igneous and Metamorphic; Alteration; Basaltic composition; Biogenic processes; Costa Rica Rift; Crust; DSDP Site 504; Deep Sea Drilling Project; East Pacific; Geochemistry; Glasses; Halmyrolysis; IPOD; Igneous rocks; Lava; Leg 111; Leg 137; Leg 140; Leg 148; Leg 69; Leg 70; Leg 83; Leg 92; Microorganisms; ODP Site 896; Ocean Drilling Program; Oceanic crust; Pacific Ocean; Pillow lava; Volcanic glass; Volcanic rocks
Coordinates: N011300 N011340 W0834320 W0834350
Record ID: 1996007311
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands