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The shallow sections of most holes drilled during Ocean Drilling Program Leg 139 contain alkenones derived from prymnesiophyte algae. The alkenones indicate a paleotemperature of the photic zone in the upper ocean during primary carbon fixation of 7°-15°C, with an average of 10.7°C. Based on laboratory hydrous pyrolyses these alkenones are altered to unknown products around 200°C and are thus useful as thermal probes. The disappearance of the alkenones occurs at various depths below seafloor in accordance with observed heat flows.

Alkenones in Sediments of Middle Valley, Leg 139: Application as Thermal Sensors