Northeastern Section (39th Annual) and Southeastern Section (53rd Annual) Joint Meeting (March 2527, 2004)
Paper No. 41-3
Presentation Time: 8:00 AM-12:00 PM

TRACE ELEMENT GEOCHEMISTRY OF SHALE : IMPLICATIONS ON THE DEPOSITIONAL ENVIRONMENTS

KHANDAKER, Nazrul I., Natural Sciences, YORK COLLEGE OF CUNY, 94-20 Guy R. Brewer Boulevard, Jamaica, New York, NY 11451, kdaker@york.cuny.edu.

The shale unit selected in this study is interbedded with bentonite horizons, laterally persistent, and belongs to the Upper Cretaceous Frontier Formation, north-central Wyoming. The geochemical data involving Peay (lower Frontier) and Torchlight (upper Frontier)shale samples provided significant clues as to the precise identification of the depositional environments of these fine-grained sediments. A multi-element plot shows similar trace element concentrations for both Peay and Torchlight shale samples. Ni, Ce, and Zn are significantly abundant in both Peay and Torchlight shale. Relatively higher concentrations of La in the Peay shale compared with the Torchlight shale reflect less terrigenous quartz input into the depositional basin and perhaps signify deposition in a quiet, less turbulent, offshore marine setting. Consistent Zr, Ni, Y, and Nb concentrations in all the shale samples analyzed suggest a similar source for the Peay and Torchlight shale, and the overall trace-element behavior (with the exception of La) is controlled by the rate of sedimentation, terrigenous input, and subsequent deepening of the depositional basin.

Northeastern Section (39th Annual) and Southeastern Section (53rd Annual) Joint Meeting (March 2527, 2004)
General Information for this Meeting
Session No. 41--Booth# 17
Sedimentation and Stratigraphy II (Posters)
Hilton McLean Tysons Corner: Ballrooms A and B
8:00 AM-12:00 PM, Friday, March 26, 2004

Geological Society of America Abstracts with Programs, Vol. 36, No. 2, p. 90

© Copyright 2004 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.