Degradative calcification of a modern siliceous sponge from the Great Bahama Bank, the Bahamas; a guide for interpretation of ancient sponge-bearing limestones

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doi: 10.2110/jsr.2007.058
Authors:Neuweiler, Fritz; Daoust, Isabelle; Bourque, Pierre-André; Burdige, David J.
Author Affiliations:Primary:
Université Laval, Département de Géologie et Génie géologique, Ste-Foy, QC, Canada
Other:
Old Dominion University, United States
Volume Title:Journal of Sedimentary Research
Source:Journal of Sedimentary Research, 77(7), p.552-563. Publisher: Society for Sedimentary Geology, Tulsa, OK, United States. ISSN: 1527-1404
Publication Date:2007
Note:In English. 102 refs.; illus., incl. 4 plates, sketch map
Summary:Organic colloids are involved in the early calcification of the modern siliceous sponge Spheciospongia vesparium (Lamarck, 1815) from the Great Bahama Bank. Electron microscopy and in situ fluorescence microspectometry studies indicate that colloids attached within or onto a collagen network promote the precipitation of aragonite crystals in these sponges. Calcification occurs within those portions of the sponge that are buried in the sediment, preferentially in regions of agglutinated sediment particles, with sponge connective tissue being subjected to necrosis and significant degradation of the extracellular collagen matrix. The dismantling of collagen bundles leads to collagen scaffolds, which act as a sorbent and have significant adhesive effects for ions and/or organic colloids. Bacteria and other microorganisms support tissue degradation, but neither act as a substrate for aragonite precipitation or are present in significant numbers at calcification sites. This process of early calcification may explain the origin of fossil calcified siliceous sponges ("sponge mummies" and "tuberoids") as well as the occurrence of patchy calcified sponge materials, thereby calling into question the commonly accepted idea that pelletoidal texture associated with these fossil sponges indicates that bacteria are directly responsible for the calcification.
Sections:Petrology
Subsections:Sedimentary petrology
Subjects:Agglutinates; Aragonite; Biochemical sedimentation; Biogenic structures; Bioherms; Calcification; Carbonate rocks; Carbonates; Degradation; Limestone; Microorganisms; Porifera; Sedimentary rocks; Sedimentary structures; Sedimentation; Siliceous composition; Atlantic Ocean; Bahamas; Caribbean region; Great Bahama Bank; North Atlantic; West Indies; Bacteria; Invertebrata; Spheciospongia vesparium
Coordinates:N251000 N252000 W0780000 W0783000
Abstract Numbers:07M/3196
Record ID:2007087705
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States, Reference includes data supplied by SEPM (Society for Sedimentary Geology)
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