DOI: 10.1007/s00531-012-0822-z
Scopus记录号: 2-s2.0-84908594394
论文题名: Seepage of methane at Jaco Scar, a slide caused by seamount subduction offshore Costa Rica
作者: Mau S. ; Rehder G. ; Sahling H. ; Schleicher T. ; Linke P.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期: 7 起始页码: 1801
结束页码: 1815
语种: 英语
英文关键词: Cold seeps
; Costa Rican fore-arc
; Methane
; Seamount subduction
; Stable carbon isotopes
; Submarine slide
Scopus关键词: carbon isotope
; cold seep
; forearc basin
; isotopic composition
; marine sediment
; methane
; seamount
; sedimentary sequence
; seepage
; stable isotope
; subduction zone
; submarine landslide
; Costa Rica
英文摘要: Methane (CH4) concentrations and CH4 stable carbon isotopic composition (Formula presented.) were investigated in the water column within Jaco Scar. It is one of several scars formed by massive slides resulting from the subduction of seamounts offshore Costa Rica, a process that can open up structural and stratigraphical pathways for migrating CH4. The release of large amounts of CH4 into the adjacent water column was discovered at the outcropping lowermost sedimentary sequence of the hanging wall in the northwest corner of Jaco Scar, where concentrations reached up to 1,500 nmol L−1. There CH4-rich fluids seeping from the sedimentary sequence stimulate both growth and activity of a dense chemosynthetic community. Additional point sources supplying CH4 at lower concentrations were identified in density layers above and below the main plume from light carbon isotope ratios. The injected CH4 is most likely a mixture of microbial and thermogenic CH4 as suggested by (Formula presented.) values between −50 and −62 ‰ Vienna Pee Dee Belemnite. This CH4 spreads along isopycnal surfaces throughout the whole area of the scar, and the concentrations decrease due to mixing with ocean water and microbial oxidation. The supply of CH4 appears to be persistent as repeatedly high CH4 concentrations were found within the scar over 6 years. The maximum CH4 concentration and average excess CH4 concentration at Jaco Scar indicate that CH4 seepage from scars might be as significant as seepage from other tectonic structures in the marine realm. Hence, taking into account the global abundance of scars, such structures might constitute a substantial, hitherto unconsidered contribution to natural CH4 sources at the seafloor. © 2012, Springer-Verlag. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84908594394&doi=10.1007%2fs00531-012-0822-z&partnerID=40&md5=5cfc5588a01aa0c5fd983943a3b1a73f
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70484
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Sonderforschungsbereich 574, University of Kiel, Kiel, Germany; GEOMAR – Helmholtz Centre for Ocean Research Kiel, Wischhofstr. 1-3, Kiel, Germany; Max-Planck-Institute for Marine Microbiology, Celsiusstr. 1, Bremen, Germany; Leibniz Institute for Baltic Sea Research Warnemünde, Seestr. 15, Rostock, Germany; Department of Geosciences, MARUM Center for Marine Environmental Sciences, Klagenfurter Str., Bremen, Germany; Department of Bioinformatics, University of Würzburg, Am Hubland, Würzburg, Germany
Recommended Citation:
Mau S.,Rehder G.,Sahling H.,et al. Seepage of methane at Jaco Scar, a slide caused by seamount subduction offshore Costa Rica[J]. International Journal of Earth Sciences,2014-01-01,103(7)