The global geographic distribution of subseafloor sedimentary microbes and the cause(s) of that distribution are largely unexplored. Here, we show that total microbial cell abundance in subseafloor sediment varies between sites by ca. five orders of magnitude. This variation is strongly correlated with mean sedimentation rate and distance from land. Based on these correlations, we estimate glob...

Processes that operate at planetary surfaces have the potential to record a history of planetary evolution in the form of sedimentary rocks. This is important because our experience on Earth shows that sediments and sedimentary rocks are the dominant archive of high-resolution proxies of present and past tectonic, climatic, and biological processes. Our understanding of the evolution of Earth’s...

Time resolved data on the carbon isotopic composition of carbonate minerals and the sulfur isotopic composition or sulfate minerals show a strong negative correlation during the Cretaceous. Carbonate minerals are isotopically heavy during this period while sulfate minerals are isotopically light. The implication is that carbon is being transferred from the oxidized, carbonate reservoir to the r...

Sedimentary rocks are one component of the modern threefold classification of rocks. They derive from the lithification of sediments, which are produced in basically two ways: by the mechanical deposition of grains derived from the alteration of other rocks (detrital or clastic rocks), or as chemical precipitates or grains formed organically or inorganically from an aqueous solution. The whole ...

1 Department of Mineral Sciences, National Museum of Natural History, Smithsonian Institution, Washington, DC, USA, 2 Department of Earth Sciences, ETH-Zurich, Institute for Geochemistry and Petrology, Zurich, Switzerland, 3 Formerly affiliated with the Department of Earth and Planetary Science, University of California, Berkeley, Berkeley, CA, USA, 4 Department of Earth Sciences, University of...

CHONDRITE. M. K. Weisberg, M. Kimura, A. Suzuki, E. Ohtani and N. Sugiura Department of Physical Sciences, Kingsborough College And Graduate Center of the City University of New York, Brooklyn, NY 11235, 2Department of Earth and Planetary Sciences, American Museum of Natural History, New York, NY10024, USA, [email protected]. Faculty of Science, Ibaraki University, Mito 310-8512, Japan, I...

a Department of Civil Engineering and Geological Sciences, University 6 of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, United States b Department of Earth Sciences, University of Durham, Durham DH1 3LE, UK c Chemistry Division, Nuclear and Radiochemistry, Los Alamos National Laboratory, MSJ514, Los Alamos, NM 87545, United States d IVA — Earth Sciences — Petrology Department, Vrije ...

The primary objective of a gravity survey over a sedimentary basin is to delineate the shape of the basin. To fulfill this objective, information is needed about the densities within the sedimentary section. Densities of sedimentary rocks increase with depth (mainly due to compaction), approaching that of the basement in deep basins. Sedimentary basins are generally associated with low gravity ...

Optical microscopy is a very unique tool to find out about the structural order of carbonaceous materials and coal by-products. It has two main utilization ways as an instrument to distinguish and quantify different phases in a polished surface and as a record of the reflectance of a given material. Using one or both capabilities there are significant contributions to different aspects of coal ...