Results 301 to 310 of about 83,571 (346)
Some of the next articles are maybe not open access.
Sedimentary processes and crustal cycling on Venus
Journal of Geophysical Research: Solid Earth, 1983Sediment exists on the Venus surface. It is observed in Venera images between outcrops and boulders of sedimentary rocks. Sediment is produced by pyroclastic volcanism and chemical weathering. Chemical weathering is driven by an enhanced activity of water and an elevated surface temperature.
openaire +1 more source
Sedimentary Cycles in the Nugget Sandstone, Northeastern Utah
Utah Geology, 1975The Nugget Sandstone is one of the classic eolian sequences of the Colorado Plateau region. North of Vernal, Utah, the Nugget contains sedimentary cycles consisting of three units: (I) red mudstone, (2) siltstone, and (3) sandstone. The thinly bedded facies of the Nugget is characterized by complete cycles (1-2-3) in which the redbeds of units I and ...
Lee R. High, M Dane Picard
openaire +1 more source
A quantitative model for the sedimentary rock cycle
Marine Chemistry, 1972Abstract A steady-state quantitative model for the sedimentary rock cycle is presented. The cycling of 11 major elements through the oceanic, atmospheric, biospheric, and rock reservoirs is shown. Flux rates are based on the estimated average geologic rates of transfer; the total flux of material through the oceans is about 1 3 that of today ...
Robert M. Garrels, Fred T. MacKenzie
openaire +1 more source
Comparative ecology of H2 cycling in sedimentary and phototrophic ecosystems
Antonie van Leeuwenhoek, 2002The simple biochemistry of H2 is critical to a large number of microbial processes, affecting the interaction of organisms with each other and with the environment. The sensitivity of each of these processes to H2 can be described collectively, through the quantitative language of thermodynamics.
Tori M, Hoehler +5 more
openaire +2 more sources
Palaeodynamic sedimentary cycles on Mars in resonance with short similar cycles on Earth
SPIE Proceedings, 2003Calculating palaeoclimatic cycles on a wide range of geological parameters of the Earth revealed the absolute dependence of climatic change on planetary and Sun orbital characteristics and resonances. Mars Orbiter Camera (MOC) images MOC2_148 and MOC2_300, taken from huge canyons near the north polar region clearly show a periglacial permafrost ...
Elfi S. Van Overloop +2 more
openaire +1 more source
Tectonic And Eustatic Controls on Sedimentary Cycles
1994The collected volume begins with a brief perspective by one of the conveners, followed by articles in order of increasing stratigraphic age. Eustatic sea-level changes and tectonic warpings of basins are competing mechanisms for explaining many stratigraphic patterns.
openaire +1 more source
High-resolution palynofacies investigation of Kimmeridgian sedimentary cycles
Geological Society, London, Special Publications, 1995Abstract Palynofacies analysis is used as a tool to investigate in detail the palaeoenvironmental variations through several sedimentary cycles in the Kimmeridge Clay of Kimmeridge Bay, Dorset, UK. Evidence is given of palaeoenvironmental variations within cycles corresponding to those expected for obliquity orbital forcing.
openaire +1 more source
Conditional Simulation of Sedimentary Cycles in Three Dimensions
1972We propose a method to determine the most probable pattern of a sedimentary cycle between boreholes. The purpose of this conditional simulation method is to solve a three-dimensional quantitative problem. It differs essentially from classical methods of quantitative studies by involving several dimensions and by not using any Markovian property.
J. Jacod, P. Joathon
openaire +1 more source
Man’s Role in the Major Sedimentary Cycle
1975Natural inputs to the sedimentary cycle result from river runoff into the oceans, atmospheric transport, and glacial movement. Although direct injection into the cycle by man is at least an order of magnitude less than that of nature, he has enhanced some of the natural processes.
openaire +1 more source
Cyclothems and Larger Sedimentary Cycles of the Pennsylvanian
The Journal of Geology, 1958Uncertainty regarding the relations of cyclothems, as recognized in Illinois, and megacyclothems, that are typically developed in eastern Kansas, has obscured the correlation of Pennsylvanian strata east and west of the Mississippi River and the interpretation of physical events that influenced sedimentation during the Pennyslvanian period.
openaire +1 more source