Ingalls, A. E. SUNY at Stony Brook, aingalls@ic.sunysb.edu
Lee, C. E. SUNY at Stony Brook, cindylee@notes.cc.sunysb.edu
Aller, R. C. SUNY at Stony Brook, raller@ccmail.sunysb.edu

 
ORGANIC CARBON PRESERVATION IN CORAL AND CARBONATE SEDIMENTS
 
Recent investigations of sedimentary carbon cycling focus on the importance of depositional environment in the preservation of organic carbon. For example, sedimentation rate, oxygen content of overlying water, bioturbation intensity, matrix and mineral surface sorption have all been shown to influence early diagenetic reactions. In addition, calcium carbonate skeletons of marine organisms are known to preserve intraskeletal organic matter: surficial organic material on carbonate debris may also be protected in micropores. The present study compares the amount, composition and diagenetic state of organic carbon preservation in two different calcium carbonate environments: carbonate sediments and the skeletons of living mound forming coral. Initial findings indicate that in coral skeletons, specific compounds, such as chlorophyll-a, may be stabilized by association with intraskeletal components. This preserved material may have use in paleoenvironmental studies. Carbonate sediments do not appear to provide the same stabilization to chlorophyll-a. Instead, chlorophyll-a in carbonate sediments degrades in a manner and rate comparable to that found in terrigenous sediments.
 
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
 
Code: CS63TH1388S