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Diagenetic origin for quartz-pebble conglomerates

Ronadh Cox, Ethan D. Gutmann and Patricia G. Hines
Diagenetic origin for quartz-pebble conglomerates
Geology (Boulder) (April 2002) 30 (4): 323-326

Abstract

The occurrence of quartz-pebble conglomerates (QPC) in the rock record increases backward through time from the Tertiary through the Precambrian. The positive correlation between QPC abundance and age is valid both for numbers of reported QPC and for QPC as a percentage of all conglomerate, and at both the era and the period level. QPC are usually interpreted as being due to intense chemical weathering, protracted transport, or sediment recycling, but none of these can account for the age distribution of QPC, which is the opposite of the global mass-age distribution for sedimentary rocks. Precambrian and Tertiary conglomerates with similar sources and sedimentology have vastly different clast populations, nonquartzose clasts being much more abundant in the younger rocks. Comparison of the petrology of QPC and polymict conglomerates shows that QPC have consistently higher proportions of diagenetic secondary matrix and pressure-solved grain contacts. We conclude that diagenetic factors play an important role in QPC formation by preferentially destroying less durable clasts.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 30
Serial Issue: 4
Title: Diagenetic origin for quartz-pebble conglomerates
Affiliation: Williams College, Geosciences Department, Williamstown, MA, United States
Pages: 323-326
Published: 200204
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 47
Accession Number: 2002-030923
Categories: Sedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2002031, available at www.geosociety.org/pubs/ft2002.htm
Illustration Description: illus.
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200211
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