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Cold seep formation from salt diapir-controlled deep biosphere oases.
Chowdhury, Anirban; Ventura, Gregory T; Owino, Yaisa; Lalk, Ellen J; MacAdam, Natasha; Dooma, John M; Ono, Shuhei; Fowler, Martin; MacDonald, Adam; Bennett, Robbie; MacRae, R Andrew; Hubert, Casey R J; Bentley, Jeremy N; Kerr, Mitchell J.
Afiliación
  • Chowdhury A; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
  • Ventura GT; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
  • Owino Y; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
  • Lalk EJ; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.
  • MacAdam N; Nova Scotia Department of Natural Resources and Renewables, Halifax, NS B3J 3J9, Canada.
  • Dooma JM; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
  • Ono S; Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139.
  • Fowler M; Applied Petroleum Technology (Canada) Ltd., Calgary, AB T3A 2M3, Canada.
  • MacDonald A; Nova Scotia Department of Natural Resources and Renewables, Halifax, NS B3J 3J9, Canada.
  • Bennett R; Natural Resources Canada, Geological Survey of Canada-Atlantic, Dartmouth, NS B2Y 4A2, Canada.
  • MacRae RA; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
  • Hubert CRJ; Geomicrobiology Group, Department of Biological Sciences, University of Calgary, Calgary, AB T2N 1N4, Canada.
  • Bentley JN; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
  • Kerr MJ; Department of Geology, Saint Mary's University, Halifax, NS B3H 3C3, Canada.
Proc Natl Acad Sci U S A ; 121(12): e2316878121, 2024 Mar 19.
Article en En | MEDLINE | ID: mdl-38466851
ABSTRACT
Deep sea cold seeps are sites where hydrogen sulfide, methane, and other hydrocarbon-rich fluids vent from the ocean floor. They are an important component of Earth's carbon cycle in which subsurface hydrocarbons form the energy source for highly diverse benthic micro- and macro-fauna in what is otherwise vast and spartan sea scape. Passive continental margin cold seeps are typically attributed to the migration of hydrocarbons generated from deeply buried source rocks. Many of these seeps occur over salt tectonic provinces, where the movement of salt generates complex fault systems that can enable fluid migration or create seals and traps associated with reservoir formation. The elevated advective heat transport of the salt also produces a chimney effect directly over these structures. Here, we provide geophysical and geochemical evidence that the salt chimney effect in conjunction with diapiric faulting drives a subsurface groundwater circulation system that brings dissolved inorganic carbon, nutrient-rich deep basinal fluids, and potentially overlying seawater onto the crests of deeply buried salt diapirs. The mobilized fluids fuel methanogenic archaea locally enhancing the deep biosphere. The resulting elevated biogenic methane production, alongside the upward heat-driven fluid transport, represents a previously unrecognized mechanism of cold seep formation and regulation.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Proc Natl Acad Sci U S A Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Estados Unidos