[1] We present molybdenum isotope and concentration data from 14 sites in the eastern Pacific from the central California to the Peru margin. The environments studied have been chosen to represent a broad range in oxidation-reduction (redox) potential, which provide a framework for the behavior of this redoxsensitive element. Manganese-rich hemipelagic sediments from the eastern tropical Pacifi...

Recent onshore New Jersey drilling (Ocean Drilling Program Leg 150X) provided excellent recovery of lower to middle Miocene sequences that we dated with Sr isotopic stratigraphy. Sequence boundaries correlate with deep-sea dO increases (inferred glacioeustatic lowerings), indicating a primary control by global sea-level change. Maryland Miocene outcrops appear to correlate with New Jersey seque...

Biogeochemical processes in sediments of the Manfredonia Gulf (Southern Adriatic Sea): early diagenesis of carbon and nutrient and benthic exchange F. Spagnoli, G. Bartholini, M. Marini, and P. Giordano National Research Council-Marine Science Institute-Departement of Lesina (FG), Italy National Research Council-Marine Science Institute-Department of Ancona, Italy National Research Council-Mari...

Argillaceous minerals in deposits of various sedimentary formations are characterized by specific chemical-mineralogical and morphological genetic features changing different stages sedimentogenesis, diagenesis, catagenesis, metagenesis. their associations terrigenous, terrigenous carbonate, volcanic, halogenic characterized. Detail characterization is given for argillaceous early sedimentogene...

Even thick sequences of sediments in marine depositional basins contain only limited segments of the record of chlorophyll diagenesis. Extracts from Pleistocene deep-sea sediments (Baker and Smith, 1973a) yielded extensive information concerning early chlorin transformations. Investigations of marine sediments of Pliocene and Miocene age resulted in the first reports of free base porphyrins occ...

The long-term goal of this study is to develop a better mechanistic and quantitative understanding of the effects of biologically-enhanced transport, mineralogy, sediment fabric, and particle surface chemistry on biogeochemical reactions occurring in coastal sediments. Specifically, we plan to provide quantitative expressions of biogeochemical processes from field and laboratory studies and to ...