geochemical cycle

geochemical cycle

[¦jē·ō¦kem·ə·kəl ′sī·kəl]
(geochemistry)
During geologic changes, the sequence of stages in the migration of elements between the lithosphere, hydrosphere, and atmosphere.
References in periodicals archive ?
In this respect the discussion of the silicate-carbonate geochemical cycle is excellent.
Inductively coupled plasma mass spectrometry (ICP-MS) is a technique that can provide routine, precise and accurate (and relatively cheap) measurements of Li isotopic composition in geological materials that need to be studied to constrain the inputs and sinks to the Li geochemical cycle.
These changes are coupled with a large range of geodynamic processes and they have first order effects on the global geochemical cycles of a large number of elements.
Combining his concept of geochemical cycles with biophile elements is useful for understanding problems of mineral nutrient depletion in soils due to environmental degradation processes such as deforestation and erosion.
Related cyanobacteria play a major role in the planet's geochemical cycles.
He describes this basic tool of process engineering mostly as it is used in modeling and designing industrial chemical processes, but does include examples illustrating its application in such fields as life-cycle analysis, medical technology, geochemical cycles and climate change, resource management, and interplanetary travel.
The introductions of the papers collectively sum up the importance of biomineralization and why geologists should care: organisms--prokaryotic starting nearly 4 billion years ago, eukaryotic barging in for the past half a billion or so--shouldered their way into virtually all geochemical cycles on Earth's surface to the point that most geochemical reactions are really biogeochemical.
Sedimentary and environmental geochemistry - Topics include: mobility of the elements in air, water and the surficial environment; geochemical cycles of elements and chemicals of environmental interest; plant composition, animal and human health in relation to the natural environment; acid deposition and other processes affecting water quality; environmental aspects of fossil fuel processing; and sampling design in large scale environmental studies.
He currently teaches classes on global warming, environmental chemistry and global geochemical cycles.
Also, she notes, the analyses could illuminate the role of nonvolcanic hydrothermal systems in the ocean's geochemical cycles, many of which are poorly understood.
Grades 9-12: energy in Earth's system * geochemical cycles * science and technology in local, national and global challenges * natural and human-induced hazards
Only recently have we begun to have enough information on global geochemical cycles to figure out what might cause CO.