Organic carbon deposition and its control on iron sulfide formation of the southern East China Sea continental shelf sediments
Resource
Continental Shelf Research 20 (4-5): 619-635
Journal
Continental Shelf Research
Journal Volume
20
Journal Issue
4-5
Pages
619-635
Date Issued
2000
Author(s)
Abstract
Sulfate reduction rates and sedimentation rates were determined in sediments at ten stations on the southern East China Sea continental shelf. The area is characterized by relatively low organic carbon concentration with fast sedimentation rate. Rapid sulfate reduction rates, ranging from 1 to 4 mmol/m2/day, were observed. Organic carbon concentration varied from 0.3 to 0.6 wt%. Sedimentation rate varied from 0.2 to 0.7 cm/yr. In addition, normal marine S/C ratios were observed. Up to 96% of pyrite-sulfur was reoxidized before its final burial. Sulfate reduction rate and pyrite-sulfur burial rate increased linearly with increasing organic carbon burial rate, indicating that organic carbon deposition controlled pyrite formation in the East china Sea continental shelf sediments. The organic carbon utilized by the sulfate reduction and its burial represented a significant but relatively small fraction of the primary production in the studied East China Sea region. (C) 2000 Elsevier Science Ltd.
Subjects
Continental shelf; Iron sulfide; Organic carbon; Pyrite; Sulfate reduction; The East China Sea
SDGs
Other Subjects
continental shelf; diagenesis; iron sulfide; organic carbon; sedimentation rate; shelf sediment; East China Sea
Type
journal article
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