Title: Proximal impact deposits at the Cretaceous-Tertiary boundary in the Gulf of Mexico: A restudy of DSDP Leg 77 Sites 536 and 540
Abstract: Research Article| August 01, 1992 Proximal impact deposits at the Cretaceous-Tertiary boundary in the Gulf of Mexico: A restudy of DSDP Leg 77 Sites 536 and 540 Walter Alvarez; Walter Alvarez 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Jan Smit; Jan Smit 2Department of Sedimentary Geology, Free University of Amsterdam, P.O. Box 7161, 1007MC Amsterdam, Netherlands Search for other works by this author on: GSW Google Scholar William Lowrie; William Lowrie 3Institut für Geophysik, ETH, 8093 Zürich, Switzerland Search for other works by this author on: GSW Google Scholar Frank Asaro; Frank Asaro 4Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 Search for other works by this author on: GSW Google Scholar Stanley V. Margolis; Stanley V. Margolis 5Department of Geology, University of California, Davis, California 95616 Search for other works by this author on: GSW Google Scholar Philippe Claeys; Philippe Claeys 5Department of Geology, University of California, Davis, California 95616 Search for other works by this author on: GSW Google Scholar Miriam Kastner; Miriam Kastner 6Scripps Institute of Oceanography, University of California, San Diego, California 92093 Search for other works by this author on: GSW Google Scholar Alan R. Hildebrand Alan R. Hildebrand 7Geophysics Division, Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Walter Alvarez 1Department of Geology and Geophysics, University of California, Berkeley, California 94720 Jan Smit 2Department of Sedimentary Geology, Free University of Amsterdam, P.O. Box 7161, 1007MC Amsterdam, Netherlands William Lowrie 3Institut für Geophysik, ETH, 8093 Zürich, Switzerland Frank Asaro 4Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 Stanley V. Margolis 5Department of Geology, University of California, Davis, California 95616 Philippe Claeys 5Department of Geology, University of California, Davis, California 95616 Miriam Kastner 6Scripps Institute of Oceanography, University of California, San Diego, California 92093 Alan R. Hildebrand 7Geophysics Division, Geological Survey of Canada, 1 Observatory Crescent, Ottawa, Ontario K1A 0Y3, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1992) 20 (8): 697–700. https://doi.org/10.1130/0091-7613(1992)020<0697:PIDATC>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Walter Alvarez, Jan Smit, William Lowrie, Frank Asaro, Stanley V. Margolis, Philippe Claeys, Miriam Kastner, Alan R. Hildebrand; Proximal impact deposits at the Cretaceous-Tertiary boundary in the Gulf of Mexico: A restudy of DSDP Leg 77 Sites 536 and 540. Geology 1992;; 20 (8): 697–700. doi: https://doi.org/10.1130/0091-7613(1992)020<0697:PIDATC>2.3.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 Restudy of Deep Sea Drilling Project Sites 536 and 540 in the southeast Gulf of Mexico gives evidence for a giant wave at Cretaceous-Tertiary boundary time. Five units are recognized: (1) Cenomanian limestone underlies a hiatus in which the five highest Cretaceous stages are missing, possibly because of catastrophic K-T erosion. (2) Pebbly mudstone, 45 m thick, represents a submarine landslide possibly of K-T age. (3) Current-bedded sandstone, more than 2.5 m thick, contains anomalous iridium, tektite glass, and shocked quartz; it is interpreted as ejecta from a nearby impact crater, reworked on the deep-sea floor by the resulting tsunami. (4) A 50-cm interval of calcareous mudstone containing small Cretaceous planktic foraminifera and the Ir peak is interpreted as the silt-size fraction of the Cretaceous material suspended by the impact-generated wave. (5) Calcareous mudstone with basal Tertiary forams and the uppermost tail of the Ir anomaly overlies the disturbed interval, dating the impact and wave event as K-T boundary age. Like Beloc in Haiti and Mimbral in Mexico, Sites 536 and 540 are consistent with a large K-T age impact at the nearby Chicxulub crater. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 1992
Publication Date: 1992-01-01
Language: en
Type: article
Indexed In: ['crossref', 'pubmed']
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Cited By Count: 139
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