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Biogeochemistry of Dihydrogen (H2)
2005Hydrogen has had an important and evolving role in Earth's geo- and biogeochemistry, from prebiotic to modern times. On the earliest Earth, abiotic sources of H2 were likely stronger than in the present. Volcanic out-gassing and hydrothermal circulation probably occurred at several times the modern rate, due to presumably higher heat flux.
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Background physics and biogeochemistry
2011Conservation equations can be formulated for most aquatic properties \((\phi)\); for transient three-dimensional problems, the general differential equation is: $$\frac{\partial}{\partial t}\phi+U_i\frac{\partial \phi}{\partial x_i}=S_\phi\ {\rm where}\ i\,=\,x,y,z $$ (2.1) where \( \phi \) could be, for example, momentum, temperature ...
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2018
Mud volcanoes are frequently encountered geo-structures at active and passive continental margins. In contrast to magmatic volcanoes, mud volcanoes are marine or terrestrial, topographic elevation built from vertically rising fluidized mud or mud breccia. Commonly, these structures have a crater, hummocky rim, and caldera. Mud volcanism is triggered by
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Mud volcanoes are frequently encountered geo-structures at active and passive continental margins. In contrast to magmatic volcanoes, mud volcanoes are marine or terrestrial, topographic elevation built from vertically rising fluidized mud or mud breccia. Commonly, these structures have a crater, hummocky rim, and caldera. Mud volcanism is triggered by
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Trace metal availability and the evolution of biogeochemistry
Nature Reviews Earth & Environment, 2023Donato Giovannelli, Giovannelli Donato
exaly
Bacteria and Marine Biogeochemistry
2000Geochemical cycles on Earth follow the basic laws of thermodynamics and proceed towards a state of maximal entropy and the most stable mineral phases. Redox reactions between oxidants such as atmospheric oxygen or manganese oxide and reductants such as ammonium or sulfide may proceed by chemical reaction, but they are most often accelerated by many ...
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