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Active Ooid Growth Driven By Sediment Transport in a High-Energy Shoal, Little Ambergris Cay, Turks and Caicos Islands

2018; Society for Sedimentary Geology; Volume: 88; Issue: 9 Linguagem: Inglês

10.2110/jsr.2018.59

1938-3681

Elizabeth J. Trower, Marjorie Cantine, Maya Gomes, J. P. Grotzinger, Andrew H. Knoll, Michael P. Lamb, Usha Lingappa, Shane S. O’Reilly, Theodore M. Present, N. Stein, Justin V. Strauss, Woodward W. Fischer,

Marine and coastal ecosystems

Research Article| September 30, 2018 Active Ooid Growth Driven By Sediment Transport in a High-Energy Shoal, Little Ambergris Cay, Turks and Caicos Islands Elizabeth J. Trower; Elizabeth J. Trower 1Department of Geological Sciences, University of Colorado Boulder, Boulder, Colorado 80309, U.S.A. 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Marjorie D. Cantine; Marjorie D. Cantine 3Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. Search for other works by this author on: GSW Google Scholar Maya L. Gomes; Maya L. Gomes 4Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, Missouri 63130, U.S.A. 5Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218, U.S.A. Search for other works by this author on: GSW Google Scholar John P. Grotzinger; John P. Grotzinger 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Andrew H. Knoll; Andrew H. Knoll 6Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138, U.S.A. Search for other works by this author on: GSW Google Scholar Michael P. Lamb; Michael P. Lamb 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Usha Lingappa; Usha Lingappa 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Shane S. O'Reilly; Shane S. O'Reilly 3Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, U.S.A. 7School of Earth Sciences, University College Dublin, Dublin, Ireland Search for other works by this author on: GSW Google Scholar Theodore M. Present; Theodore M. Present 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Nathan Stein; Nathan Stein 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Justin V. Strauss; Justin V. Strauss 8Department of Earth Sciences, Dartmouth College, Hanover, New Hampshire 03755, U.S.A. Search for other works by this author on: GSW Google Scholar Woodward W. Fischer Woodward W. Fischer 2Department of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A. Search for other works by this author on: GSW Google Scholar Journal of Sedimentary Research (2018) 88 (9): 1132–1151. https://doi.org/10.2110/jsr.2018.59 Article history first online: 31 Oct 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Elizabeth J. Trower, Marjorie D. Cantine, Maya L. Gomes, John P. Grotzinger, Andrew H. Knoll, Michael P. Lamb, Usha Lingappa, Shane S. O'Reilly, Theodore M. Present, Nathan Stein, Justin V. Strauss, Woodward W. Fischer; Active Ooid Growth Driven By Sediment Transport in a High-Energy Shoal, Little Ambergris Cay, Turks and Caicos Islands. Journal of Sedimentary Research 2018;; 88 (9): 1132–1151. doi: https://doi.org/10.2110/jsr.2018.59 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 SocietyJournal of Sedimentary Research Search Advanced Search Abstract Ooids are a common component of carbonate successions of all ages and present significant potential as paleoenvironmental proxies, if the mechanisms that control their formation and growth can be understood quantitatively. There are a number of hypotheses about the controls on ooid growth, each offering different ideas on where and how ooids accrete and what role, if any, sediment transport and abrasion might play. These hypotheses have not been well tested in the field, largely due to the inherent challenges of tracking individual grains over long timescales. This study presents a detailed field test of ooid-growth hypotheses on Little Ambergris Cay in the Turks and Caicos Islands, British Overseas Territories. This field site is characterized by westward net sediment transport from waves driven by persistent easterly trade winds. This configuration makes it possible to track changes in ooid properties along their transport path as a proxy for changes in time. Ooid size, shape, and radiocarbon age were compared along this path to determine in which environments ooids are growing or abrading. Ooid surface textures, petrographic fabrics, stable-isotope compositions (δ13C, δ18O, and δ34S), lipid geochemistry, and genetic data were compared to characterize mechanisms of precipitation and degradation and to determine the relative contributions of abiotic (e.g., abiotic precipitation, physical abrasion) and biologically influenced processes (e.g., biologically mediated precipitation, fabric destruction through microbial microboring and micritization) to grain size and character. A convergence of evidence shows that active ooid growth occurs along the transport path in a high-energy shoal environment characterized by frequent suspended-load transport: median ooid size increases by more than 100 μm and bulk radiocarbon ages decrease by 360 yr westward along the ∼ 20 km length of the shoal crest. Lipid and 16S rRNA data highlight a spatial disconnect between the environments with the most extensive biofilm colonization and environments with active ooid growth. Stable-isotope compositions are indistinguishable among samples, and are consistent with abiotic precipitation of aragonite from seawater. Westward increases in ooid sphericity and the abundance of well-polished ooids illustrate that ooids experience subequal amounts of growth and abrasion—in favor of net growth—as they are transported along the shoal crest. Overall, these results demonstrate that, in the Ambergris system, the mechanism of ooid growth is dominantly abiotic and the loci of ooid growth is determined by both carbonate saturation and sediment transport mode. Microbes play a largely destructive, rather than constructive, role in ooid size and fabric. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.