Hostname: page-component-5c6d5d7d68-tdptf Total loading time: 0 Render date: 2024-08-15T08:18:46.688Z Has data issue: false hasContentIssue false
  • English
  • Français

Petrographic Aspects of a Sequence of Quaternary Volcanic Ashes from the Laguna de Fuquene area, Colombia, and their Stratigraphic Significance

Published online by Cambridge University Press:  20 January 2017

P.A. Riezebos
P.A. Riezebos*
Affiliation:
Laboratory of Physical Geography and Soil Science, University of Amsterdam, Dapperstraat 115, Amsterdam-O., The Netherlands
Get access Rights & Permissions [Opens in a new window]

Abstract

A core section from the Fuquene area (Cordillera Oriental, Colombia) with a total length of 60 m shows a predominantly peaty-clay zone in the upper 12 m containing 15 laminae and thin layers of fine-grained, pyroclastic material. These 15 layers consist of crystal-vitric ash derived from dacitic-andesitic magmas. Mineralogic data and refractive index (r.i.) values of the associated glass shards make it possible to distinguish a lower group of mica-rich and an upper group of pyroxene-bearing ash layers. The successive layers illustrate a progressive increase of hydration of the shards with time and with decreasing particle size. The frequency distribution curves of the r.i. values of 8–4- and 75–50-μm shards are in general rather similar. Provisional pollen data and some radiocarbon dates allow comparison of the petrographic properties of these ashes with those of some ash occurrences in a nearby palynologically investigated core section. This comparison indicates that the mica-rich ashes were produced between about 44,000 and 20,000 yr B.P. and that the production of the pyroxene-bearing ashes took place after about 20,000 yr B.P. The petrographic features of a number of ashes, collected from sections and cores at different sites of the Sabana de Bogotá, appear to be comparable with those established in the sequence of Fuquene ashes. This suggests that these petrographic characteristics may be of use in correlation studies in the Sabana de Bogotá and adjacent areas.

Type
Original Articles
Information
Quaternary Research , Volume 10 , Issue 3 , November 1978 , pp. 401 - 424
Copyright
University of Washington

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Borchardt, G.A., Harward, M.E., Schmitt, R.A., 1970. Correlation of volcanic ash deposits by activation analyses of glass separates. Quaternary Research. 1, 247-260.Google Scholar
Botero, P.J., 1972. Soils of Guasca-Guatavita, Colombia. Unpublished M.S. thesis. Institute for Aerial Survey and Earth Sciences, Enschede, The Netherlands. Google Scholar
Bowles, F.A., Jack, R.N., Carmichael, I.S.E., 1973. Investigation of deep-sea volcanic ash layers from Equatorial Pacific cores. Geological Society of America Bulletin. 84, 2371-2388.Google Scholar
Cinc̀ura, J., ̀ura, 1967. Abhängigkeit der Hypersthenzerstörung am Alter der Flussterrassen. Geologicky Sbornik. XVIII, 117-123.Google Scholar
Correal Urrego, G., Van der Hammen, T., 1977. Investigationes Arqueologicas en los Abrigos rocosos del Tequendama. Biblioteca Banco Popular. .Google Scholar
Friedman, I., Smith, R.L., 1960. A new dating method using obsidian: Part 1, The development of the method. American Antiquity. 25, 476-522.CrossRefGoogle Scholar
Geel, B., Van der Hammen, T., 1973. Upper Quaternary vegetational and climatic sequence of the Fuquene area (Eastern Cordillera, Colombia). Paleogeography Palaeoclimatology Palaeoecology. 14, 9-92.Google Scholar
Herd, D.G., 1974. Glacial and Volcanic Geology of the Ruiz-Tolima Volcanic Complex. Cordillera Central, Colombia. Unpublished PhD dissertation. University of Washington, Seattle, Wash. Google Scholar
Irving, E.M., 1971. La evolución estructural de los Andes mas septentrionales de Colombia. Boletin Geologico. 19.Google Scholar
Izett, G.A., Wilcox, R.E., Powers, H.A., Desborough, G.A., 1970. The Bishop ash bed, a Pleistocene marker bed in the western United States. Quaternary Research. 1, 121-132.CrossRefGoogle Scholar
Jack, R.N., Carmichael, I.S.E., 1969. The chemical “fingerprinting” of acid volcanic rocks. California, Division of Mines and Geology Special Report. 100, 17-32.Google Scholar
Lemke, R.W., Mudge, M.R., Wilcox, R.E., Powers, H.A., 1975. Geologic Setting of the Glacier Peak and Mazama ash-bed markers in West-Central Montana. Geological Survey Bulletin. 1395-H.Google Scholar
Pichler, H., Zeil, W., 1971. Junger Vulkanismus in Chile. Münster. Forsch. Geol. Paläont.. H20/21, 215-233.Google Scholar
Randle, K., Goles, G.G., Kittleman, L.R., 1970. Geochemical and Petrological characterization of ash samples from Cascade Range volcanoes. Quaternary Research. 1, 261-282.Google Scholar
Riezebos, P.A., 1968. Phase contrast applied in the microscopic study of mineral particles in saprolites. Geologie en Mijnbouw. 5, 316-329.Google Scholar
Roedder, E., Smith, R.L., 1965. Liquid water in pumice vesicles, a crude but useful dating method. Geological Society of America Special Papers. 82, 164 Abstracts for 1964.Google Scholar
Ross, C.S., 1928. Altered paleozoic volcanic materials and their recognition. American Association of Petroleum Geologists Bulletin. 12, 143-164.Google Scholar
Ross, C.S., Smith, R.L., 1953. Water and other volatiles in volcanic glasses. American Mineralogist. 40, 1071-1089.Google Scholar
Schreve Brinkman, C.J., 1978. A palynological study of the upper Quaternary sequence in the El Abra corridor and rock shelters (Colombia). Paleogeography Palaeoclimatology Palaeoecology. in press.CrossRefGoogle Scholar
Steen-McIntyre, 172., 1975. Hydration and superhydration of tephra glass—A potential tool for estimating age of Holocene and Pleistocene ash beds. Suggate, R.P., Cresswell, M.M., Quaternary Studies. The Royal Society of New Zealand, Wellington, 271-278.Google Scholar
Van der Hammen, T., Werner, J.H., van Dommelen, H., 1973. Palynological record of the upheaval of the northern Andes: A study of the Pliocene and lower Quaternary of the Colombian Eastern Cordillera and the early evolution of its high-Andean biota. Review of Palaeobotany of Palynology. 16, 1-122.CrossRefGoogle Scholar
Van der Hammen, T., 1973. The Quaternary of Colombia: Introduction to a research project and a series of publications. Palaeogeography Palaeoclimatology Palaeoecology. 14, 1-7.Google Scholar
Van der Hammen, T., 1978. Stratigraphy and environments of the Upper Quaternary of the El Abra corridor and rock shelters. Palaeogeography Palaeoclimatology Palaeoecology. in press.Google Scholar
Wijmstra, T.A., Van der Hammen, T., 1974. The last interglacial-glacial cycle: State of affairs of correlation between data obtained from the land and from the ocean. Geologie en Mijnbouw. 53, 386-392.Google Scholar
Wilcox, R.E., 1962. Cherkasov's “focal screening” for determination of refractive index by the immersion method. Proceedings, 8th International Microsc. Symposium 1960. McCrone Associates, Chicago, 160-165 Proc..Google Scholar
Wilcox, R.E., 1965. Volcanic ash chronology. Wright, H.E., Frey, D.G., The Quaternary of the United States. Princeton Univ. Press, Princeton, N. J, 807-816.Google Scholar
Wilcox, R.E., 1978. Refractive index determination using the central focal masking technique. in press.Google Scholar