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Alvarez, Walter; Smit, Jan; Lowrie, William; Asaro, Frank; Margolis, Stanley V; Claeys, Philippe; Kastner, Miriam; Hildebrand, Alan R (1992): Iridium contents and microprobe analyses of DSDP Leg 77 samples [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712634, Supplement to: Alvarez, W et al. (1992): Proximal impact deposits at the Cretaceous-Tertiary boundary in the Gulf of Mexico: A restudy of DSDP Leg 77 Sites 536 and 540. Geology, 20(8), 697-700, https://doi.org/10.1130/0091-7613(1992)020%3C0697:PIDATC%3E2.3.CO;2

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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.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 23.659300 * Median Longitude: -84.790250 * South-bound Latitude: 23.489800 * West-bound Longitude: -85.209700 * North-bound Latitude: 23.828800 * East-bound Longitude: -84.370800
Date/Time Start: 1981-01-09T00:00:00 * Date/Time End: 1981-01-19T00:00:00
Event(s):
77-536 * Latitude: 23.489800 * Longitude: -85.209700 * Date/Time: 1981-01-09T00:00:00 * Elevation: -2790.0 m * Penetration: 213 m * Recovery: 65.3 m * Location: Gulf of Mexico/SLOPE * Campaign: Leg77 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 23 cores; 213 m cored; 0 m drilled; 30.7 % recovery
77-540 * Latitude: 23.828800 * Longitude: -84.370800 * Date/Time: 1981-01-19T00:00:00 * Elevation: -2926.0 m * Penetration: 745.5 m * Recovery: 335.1 m * Location: Gulf of Mexico * Campaign: Leg77 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 79 cores; 745.5 m cored; 0 m drilled; 44.9 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets

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Datasets listed in this publication series

  1. Alvarez, W; Smit, J; Lowrie, W et al. (1992): (Supplement) Iridium contents in sediments at DSDP Site 77-536. https://doi.org/10.1594/PANGAEA.712632
  2. Alvarez, W; Smit, J; Lowrie, W et al. (1992): (Supplement) Iridium contents in sediments at DSDP Site 77-540. https://doi.org/10.1594/PANGAEA.712633
  3. Alvarez, W; Smit, J; Lowrie, W et al. (1992): (Table 1) Microprobe analyses of DSDP Leg 77 volcanic glass fragments. https://doi.org/10.1594/PANGAEA.711999