Skip to Main Content
GEOREF RECORD

Application of microfacies analysis to the identification of stratigraphic marker beds in the Tertiary strata of northern Puerto Rico

Robert H. Osborne, Walter R. Junge and George A. Seiglie
Application of microfacies analysis to the identification of stratigraphic marker beds in the Tertiary strata of northern Puerto Rico
Reviews in Engineering Geology (1979) 4: 141-152

Abstract

Microfacies analysis is a mature and sophisticated set of procedures for solving a variety of stratigraphic problems. One of the most important of these problems is the identification and definition of surfaces for stratigraphic correlation. There is virtually no end to the list of potential correlative surfaces that can be defined by microfacies analysis, particularly when used in conjunction with available mathematical techniques for the quantification of geologic data. Such procedures are particularly useful in stratigraphic units characterized by complex facies relationships, such as reef-associated paleoenvironments. The utility of microfacies analysis in evaluating potential sites for nuclear power plants and other engineered structures is exemplified by studies performed in conjunction with the NORCO-NP-1 nuclear power plant site in northern Puerto Rico. The definition of three microfacies (Globigerinidea, Nummulites cojimarensis, and Amphistegina spp., in ascending order) within the Quebradillas Limestone (Tertiary) at the NORCO-NP-1 nuclear power plant site demonstrated that two surfaces along which important natural gamma ray peaks occur are stratigraphically controlled rather than being controlled by dislocation surfaces, unconformities, jointing, or karstification. This was accomplished by showing that the surfaces defined by the gamma ray peaks are parallel or subparallel to two depositional surfaces, the base and top of the N. cojimarensis microfacies, within the apparently massive carbonates of the Quebradillas Limestone.


ISSN: 0080-2018
EISSN: 2169-799X
Coden: GAEGA4
Serial Title: Reviews in Engineering Geology
Serial Volume: 4
Title: Application of microfacies analysis to the identification of stratigraphic marker beds in the Tertiary strata of northern Puerto Rico
Affiliation: Univ. South. Calif., Dep. Geol. Sci., Los Angeles, CA, United States
Pages: 141-152
Published: 1979
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 70
Accession Number: 1981-013406
Categories: Engineering geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: strat. col., sect., plates, sketch maps
N18°28'60" - N18°29'45", W66°37'30" - W66°34'50"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 1981
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal