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Sigurdsson, Haraldur; Kelley, Simon P; Leckie, R Mark; Carey, Steven N; Bralower, Timothy J; King, John W (2000): Argon ratios, 40Ar/39Ar datings and biostratigraphic ages of ODP Leg 165 sites [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.803522, Supplement to: Sigurdsson, H et al. (2000): History of circum-Caribbean explosive volcanism: 40Ar/39Ar dating of tephra layers. In: Leckie, RM; Sigurdsson, H; Acton, GD; Draper, G (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 165, 1-16, https://doi.org/10.2973/odp.proc.sr.165.021.2000

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Abstract:
Drilling in the Caribbean Sea during Ocean Drilling Program Leg 165 has recovered a large number of silicic tephra layers and led to the discovery of three major episodes of explosive volcanism that occurred during the last 55 m.y. on the margins of this evolving ocean basin. The earliest episode is marked by Paleocene to early Eocene explosive volcanism on the Cayman Rise, associated with activity of the Cayman arc, an island arc that was the westward extension of the Sierra Maestra volcanic arc in southern Cuba. Caribbean sediments also document a major mid- to late Eocene explosive volcanic episode that is attributed to ignimbrite-forming eruptions on the Chortis Block in Central America to the west. This event is contemporaneous with the first phase of activity of the Sierra Madre volcanic episode in Mexico, the largest ignimbrite province on Earth. In the Caribbean sediments, a Miocene episode of explosive volcanism is comparable to the Eocene event, and also attributed to sources in the Central American arc to the west. Radiometric 40Ar/39Ar dates have been obtained for biotites and sanidines from 27 tephra layers, providing absolute ages for the volcanic episodes and further constraining the geochronology of Caribbean sediments. Volcanic activity of the Cayman arc is attributed to the northward subduction of the leading edge of the oceanic plate that carried the Caribbean oceanic plateau. Although the factors generating the large episodes of Central American explosive volcanism are unclear, we propose that they are related to contemporary major readjustments of plate tectonic configuration in the Pacific.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: 15.364794 * Median Longitude: -79.361539 * South-bound Latitude: 12.743300 * West-bound Longitude: -82.936100 * North-bound Latitude: 19.489600 * East-bound Longitude: -74.910400
Date/Time Start: 1995-12-28T21:15:00 * Date/Time End: 1996-02-15T19:45:00
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. Sigurdsson, H; Kelley, SP; Leckie, RM et al. (2000): (Table 3) Argon ratios and datings of tephra layer feldspars from ODP Hole 165-999A. https://doi.org/10.1594/PANGAEA.803521
  2. Sigurdsson, H; Kelley, SP; Leckie, RM et al. (2000): (Table 2) Comparison of radiometric 40Ar/39Ar datings of tephra layers and biostratigraphic ages from ODP Leg 165 sites. https://doi.org/10.1594/PANGAEA.803520
  3. Sigurdsson, H; Kelley, SP; Leckie, RM et al. (2000): (Table 1) Argon ratios and datings of tephra layer biotites from ODP Leg 165 sites. https://doi.org/10.1594/PANGAEA.803519