The Los Chocoyos Ash Guatemala: a major stratigraphic marker in middle America and in three ocean basins

Auteurs :
DREXLER, J. W.
ROSE, W. I.
SPARKS, R. S. J.
LEDBETTER, M. T.

Description :
The Los Chocoyos Ash, having erupted from vents near the Lake Atitlan caldera, Guatemala, is perhaps the largest Quaternary silicic pyroclastic unit in Central America. One-hundred-and-five samples of ash from the Guatemalan Highlands and deep-sea cores in the equatorial Pacific and Gulf of Mexico were analyzed by neutron activation and/or electron microprobe. Chemical data from this study are used to correlate the Y-8 ash layer of the Gulf of Mexico with the Los Chocoyos Ash. The recognition of the Los Chocoyos Ash in the Gulf of Mexico and equatorial Pacific increases the Known areal extent of the unit to more than 610 km and allows an ange of 84,000 yr B.P. to be assigned to the formation on the basis of oxygen-isotope stratigraphy, biostratigraphy, and Pa-Th-isotope data.


Type de document :
Article de périodique

Source :
Quaternary research New York, 1980, vol. 13, n°. 3, p. 327-345, Références bibliographiques : 47réf.

Date :
1980