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Paleobathymetric Significance of the Foraminifera from the Hokuroku District

By
Albert L. Guber
Albert L. Guber
Department of Geosciences, The Pennsylvania State University, University Park, Pennsylvania 16802
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Samuel Merrill, III
Samuel Merrill, III
Department of Mathematics-Computer Science, Wilkes College, Wilkes-Barre, Pennsylvania 18766
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Published:
January 01, 1983

Abstract

A statistical model for estimating paleodepths based on foraminifera was developed and applied to the foraminifera-bearing Hokuroku district samples. Samples with bathymetrically mixed foraminifera, which were transported downslope by turbidity currents, were identified with the aid of a likelihood index of mixing. Ninety-four percent of the estimated depths of the nonmixed samples lie between 3,400 and 4,100 m, with a mean depth of 3,500 m. Ninety-five percent of the 95 percent confidence intervals for these estimates lie between 1,900 and 5,000 m. The geographic distribution of the bathymetrically mixed foraminifera was used to infer a sea-floor paleotopography showing a north-south depression lying just east of Odate and a similar east-west depression lying along the south margin of the Hokuroku district. The distribution of the benthic agglutinated and benthic calcareous foraminifera suggests that the entire Hokuroku district was under the calcite compensation depth during the middle Miocene.

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Contents

Economic Geology Monograph Series

The Kuroko and Related Volcanogenic Massive Sulfide Deposits

Hiroshi Ohmoto
Hiroshi Ohmoto
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Brian J. Skinner
Brian J. Skinner
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Society of Economic Geologists
Volume
5
ISBN electronic:
9781629490007
Publication date:
January 01, 1983

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