Great Bahama Bank aragonitic muds; mostly inorganically precipitated, mostly exported

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doi: 10.1306/D4267B81-2B26-11D7-8648000102C1865D
Authors:Milliman, John D.; Freile, Deborah; Steinen, Randolph P.; Wilber, R. Jude
Author Affiliations:Primary:
Woods Hole Oceanographic Institution, Woods Hole, MA, United States
Other:
Boston University, United States
University of Connecticut, United States
Volume Title:Journal of Sedimentary Petrology
Source:Journal of Sedimentary Petrology, 63(4), p.589-595. Publisher: Society of Economic Paleontologists and Mineralogists, Tulsa, OK, United States. ISSN: 0022-4472
Publication Date:1993
Note:In English. 41 refs.; illus. incl. 2 tables, geol. sketch maps
Summary:Sr concentrations in aragonitic muds on the banktop and leeward slope of Great Bahama Bank (GBB) are greater than in the needles produced by codiacean green algae but the same as in precipitated sand-size ooids and other nonskeletal grains. Results of two-part and three-part mixing models suggest that chemically precipitated aragonite contributes an average of 55-78% of the clay-size aragonite; individual samples contain as much as 95% chemically precipitated aragonite. Nonskeletal aragonitic needles apparently are precipitated ubiquitously over GBB but accumulate on the banktop only leeward of Andros Island. Much of the mud produced on the bank is exported to deeper waters: the thickness of mud-dominated Holocene sediments on the leeward slope can reach 90 m, and the aragonitic lysocline around the Bahamas is depressed by nearly 1500 m.
Subjects:Alkaline earth metals; Aragonite; Carbonates; Cenozoic; Chemical composition; Clastic sediments; Holocene; Metals; Mineral composition; Mud; Quaternary; Sediments; Strontium; Andros Island; Atlantic Ocean; Bahamas; Caribbean region; Great Bahama Bank; North Atlantic; West Indies
Abstract Numbers:94M/771
Record ID:1993023523
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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