The Stratigraphy of Late Quaternary Deposits in the Payan Mining District, Narino, Colombia, South America

<p>Late Quaternary terrace deposits along the Rio Magui consist of cobble or pebble gravels with thick volcanic ash caps. These gravel terrace deposits unconformably overlie a cemented volcanic tuff (Ananias Formation), and are subdivided into two formations (Antigua and Panambi formations) based on the cobble lithology and size, depth of weathering, geomorphic relationships, and heavy mineral assemblages. Carbon-14 dates from wood suggest that the Antigua fan deposits are older (greater than 40,000 YBP) than the lower Panambi alluvium (less tahn 25,000 YBP) which is restricted to lower terraces within the modern river valleys.</p> <p>Two separate ash units identified by differences in mineralogy and magnetite element composition, both buried active alluvial surfaces. The San Juan Ash paraconformably overlies the Antigua cobble gravels and the Magui Ash paraconformably overlies the Panambi gravels. The present-day Rio Magui channel and overbank deposits (Payan Formation) form another gravel with abundant sand and mud interbeds similar to the Panambi Formation, but finer textured and more mineralogically mature than the Antigua gravel unit.</p>

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

Thesis

Discipline thesis:degree_discipline

Ocean & Earth Sciences

Year dc:date.available

1987

Author dc:creator

• Barringer, Richard Alan

Contributors dc:contributor

• Dennis A. Darby
• G. Richard Whittecar
• Joseph Rule
• Ramesh Venkatakrishnan

• Gold mines
• Mining
• Deposition
• Sedimentation
• Columbia
• Geology

Statement dc:rights

• <p>In Copyright. URI: <a href="http://rightsstatements.org/vocab/InC/1.0/">http://rightsstatements.org/vocab/InC/1.0/</a> This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).</p>

Repository record dc:identifier

https://digitalcommons.odu.edu/oeas_etds/108

OAI identifier oai:identifier

oai:digitalcommons.odu.edu:oeas_etds-1098