Stable isotopic ratios and origins of the carbonates associated with cold seepage at the eastern Nankai Trough

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doi: 10.1016/0012-821X(92)90101-Z
Author(s): Sakai, H.; Gamo, T.; Ogawa, Y.; Boulègue, Jacques
Author Affiliation(s): Primary:
Univ. Tokyo, Ocean Res. Inst., Tokyo, Japan
Ec. Norm. Supér., France
Kyushu Univ., Japan
Univ. Pierre et Marie Curie, France
Volume Title: Fluids in convergent margins
Volume Author(s): Kastner, M., editor; Le Pichon, Xavier
Source: Earth and Planetary Science Letters, 109(3-4), p.391-404; Fluids in subduction zones, Paris, France, Nov. 5-6, 1991, edited by M. Kastner and Xavier Le Pichon. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0012-821X CODEN: EPSLA2
Note: In English. 20 refs.; illus. incl. 1 table, sketch map
Summary: Two types of cold-seeps were located at this trough: 1) seeps on sediment-covered sea-floor 3800-3600 m in depth at the toe of the accretionary prism; and 2) those between 1900 and 2100 m, situated on the backthrust of the prism, covered with rough outcrops of calcareous sandstones. Fragments of sandstone pipes or chimneys were recovered from type-1 seeps, whereas in type-2 seeps, massive carbonate-cemented sandstones and silty sandstones were obtained, many of which contain cemented fragments of different lithologies and textures, including dense aggregates of fossil Calyptogena- type clam shells. The carbon isotopic ratios of the carbonates in these sediments range from -36 to -56 per mille PDB. The formation of the carbonates is discussed. [Authors' abstract]
Year of Publication: 1992
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 07 Marine Geology and Oceanography; Accretionary wedges; Biochemistry; Bivalvia; C-13/C-12; Calyptogena; Carbon; Carbonate sediments; Carbonates; Cementation; Deep-sea environment; Dehydration; Diagenesis; Fluid phase; Geochemistry; Heterodonta; Invertebrata; Isotopes; Leg 131; Marine environment; Marine sediments; Mollusca; Nankai Trough; North Pacific; Northwest Pacific; O-18/O-16; Ocean Drilling Program; Ocean floors; Oxygen; Pacific Ocean; Pore water; Sediments; Shells; Stable isotopes; Troughs; Veneroida; Vesicomyidae; West Pacific
Coordinates: N333500 N335200 E1380500 E1374500
Record ID: 1992024692
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom