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Abstract
Journal of Sedimentary Research, Section
A: Sedimentary Petrology and Processes
Vol. 67 (1997)No.
5. (September), Pages 884-890
Sources and Distribution of Organic and Carbonate Carbon in Surface Sediments
of Pyramid Lake, Nevada
Gabrielle E. Tenzer, Philip A. Meyers, Peter Knoop
ABSTRACT
Surface sediment samples from 32 sites in Pyramid Lake, Nevada, have been
studied to investigate the sources and distribution of carbon within a
large, terminal lake basin. The origins of organic and inorganic carbon
in the sediments of this lake are predominantly from in-lake sources. Dilution
of these sedimentary materials by land-derived elastic components occurs
near the mouth of the Truckee River, the only perennial river entering
the lake. Total organic carbon (TOC) concentrations and CaCO3
concentrations and d18O values increase
while organic matter C/N atomic ratios and d13C
values decrease with increasing distance from the river mouth as the proportion
of river-derived components decreases. Aragonite precipitates from lake
water and dominates CaCO3 deposition in most parts of the lake,
except near underlake springs, where calcite precipitates. TOC concentrations
increase as water depth increases, reflecting grain sorting as smaller
particles are resuspended and focused toward the deep basin center.
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