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Microbial fractionation of carbon isotopes in altered basaltic glass from the Atlantic Ocean, Lau Basin and Costa Rica Rift
Ist Teil von
Chemical geology, 2001-03, Vol.173 (4), p.313-330
Ort / Verlag
Elsevier B.V
Erscheinungsjahr
2001
Link zum Volltext
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Textural and DNA studies of pillow lavas in DSDP/ODP cores from the Atlantic Ocean, the Lau Basin and the Costa Rica Rift indicate that microbes had a significant role in the alteration of basaltic glasses. Carbon isotopes (
δ
13C) in carbonates from glassy and crystalline basalts from these locations also show differences that may relate to microbial activity during alteration. The generally low
δ
13C values (<−7‰) in the basaltic glass of a high proportion of samples from the Atlantic, and most of the Costa Rica Rift material were attributed to alteration influenced by
Bacteria and oxidation of organic matter. Positive
δ
13C values of some samples from the Atlantic suggest lithotrophic utilization of CO
2, in which methanogenic
Archaea produced CH
4 from H
2 and CO
2. This may result from higher abiotic production of H
2 in the slow-spreading, fault-dominated Atlantic crust, due to more extensive serpentinization than at the intermediate-spreading Costa Rica Rift.