Portal de Periódicos da CAPES

Silicon isotope fractionation by marine sponges and the reconstruction of the silicon isotope composition of ancient deep water

2003; Geological Society of America; Volume: 31; Issue: 5 Linguagem: Inglês

10.1130/0091-7613(2003)031 2.0.co;2

1943-2682

Christina L. De La Rocha,

Silicon Effects in Agriculture

Research Article| May 01, 2003 Silicon isotope fractionation by marine sponges and the reconstruction of the silicon isotope composition of ancient deep water Christina L. De La Rocha Christina L. De La Rocha 1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Christina L. De La Rocha 1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK Publisher: Geological Society of America Received: 14 Aug 2002 Revision Received: 15 Jan 2003 Accepted: 17 Jan 2003 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (5): 423–426. https://doi.org/10.1130/0091-7613(2003)031 2.0.CO;2 Article history Received: 14 Aug 2002 Revision Received: 15 Jan 2003 Accepted: 17 Jan 2003 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christina L. De La Rocha; Silicon isotope fractionation by marine sponges and the reconstruction of the silicon isotope composition of ancient deep water. Geology 2003;; 31 (5): 423–426. doi: https://doi.org/10.1130/0091-7613(2003)031 2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The silicon isotope composition (δ30Si) of biogenic opal provides a view of the silica cycle at times in the past. Reconstructions require the knowledge of silicon isotope fractionation during opal biomineralization. The δ30Si of specimens of hexactinellid sponges and demosponges growing in the modern ocean ranged from −1.2‰ to −3.7‰ (n = 6), corresponding to the production of opal that has a δ30Si value 3.8‰ ± 0.8‰ more negative than seawater silicic acid and a fractionation factor (α) of 0.9964. This is three times the fractionation observed during opal formation by marine diatoms and terrestrial plants and is the largest fractionation of silicon isotopes observed for any natural process on Earth. The δ30Si values of sponge spicules across the Eocene-Oligocene boundary at Ocean Drilling Program Site 689 on Maud Rise range from −1.1‰ to −3.0‰, overlapping the range observed for sponges growing in modern seawater. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.