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Temporal and spatial sources of silica for chert remain poorly constrained. Modern sources to the worlds oceans include silica in rivers > aeolian (dust) deposition > sea floor vents and submarine weathering. However, changes in aridity and dust flux during the Phanerozoic may explain variations in the ocean silica cycle and times and places of chert formation. The chemistry of fine quartz dust (FQD) provides a chemical mechanism for the transformation of FQD to polymorphs of silica in chert; FQD is readily dissolved, then reprecipitated as Opal-A by either biotic or abiotic processes. An unequivocal relation between increases in dust flux and biogenic opal-A in the western Pacific Ocean during the past 200 kyr...
Tags: Africa,
Energy Resources,
Geochemistry,
International,
Soil Sciences, All tags...
USGS Science Data Catalog (SDC),
aridity,
chalcedony,
chemistry,
chert,
deposition,
dust,
eolian,
flocculates,
gypsum,
loess,
microcrystalline,
opal,
porcellanite,
quartz,
silica polymorphs,
silt,
wind, Fewer tags
Categories: Publication;
Types: Citation;
Tags: ASW, Caribbean Sea,
Africa,
Air pollution,
Air-water interactions,
Aspergillus, All tags...
Aspergillus syndowii,
Atmospheric particulates,
Caribbean Region,
Coral reefs,
Diadema,
Dust,
Dust clouds,
Environmental degradation,
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Fungi,
Marine pollution,
Mortality,
P 1000 MARINE POLLUTION; Q5 01504 Effects on organisms; O 40,
Pollution Abstracts; ASFA 3: Aquatic Pollution & Environment,
Trans-boundary pollution, Fewer tags
Categories: Publication;
Types: Citation;
Tags: Africa,
Asia,
Australia,
Blow flies,
Calliphoridae, All tags...
Chrysomya bezziana,
Chrysomya bezziana,
Diptera,
F 06807 Active immunization; Z 05206 Medical & veterinary en,
Immunology,
Immunology Abstracts; Entomology Abstracts,
Larvae,
Livestock,
Middle East,
Parasites,
Pest control,
Vaccination,
Vaccines, Fewer tags
Categories: Publication;
Types: Citation;
Tags: Africa,
Africa,
Biosphere,
Climatic changes,
D 04680 Paleoecology; M1 200 Human Population-Biosphere Inte, All tags...
Decomposition,
Ecology Abstracts; Human Population,
Environmental degradation,
Evolution,
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Fires,
Game animals,
Herbivores,
Holocene,
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Tags: Africa,
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M1 320 Environmental & Natural Resource Development,
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Types: Citation;
Tags: Africa,
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Land use,
M1 320 Environmental & Natural Resource Development,
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food security, Fewer tags
Categories: Publication;
Types: Citation;
Tags: Africa,
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Tags: Africa,
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Categories: Publication;
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Tags: Africa,
Africa, East,
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D 04003 Modeling, mathematics, computer applications; M1 400, All tags...
Ecology Abstracts; Human Population,
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Tags: Adults,
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Types: Citation;
Tags: Africa,
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Tags: Africa,
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Z 05207 Agricultural & general applied entomology, Fewer tags
Categories: Publication;
Types: Citation;
Tags: Africa,
Africa,
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Environmental equity,
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SW 4020 Evaluation process; AQ 00001 Water Resources and Sup,
Simulation,
South Africa,
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Water Demand,
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Water Resources Planning,
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Categories: Publication;
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Tags: Africa,
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P 9000 ENVIRONMENTAL ACTION; O 4080 Pollution - Control and ,
PACSICOM,
Policies,
Pollution Abstracts; Oceanic Abstracts; ASFA 3: Aquatic Poll,
Pollution control,
Regional planning,
Research,
Resource management,
Sustainable development,
Technology transfer,
United Nations,
World Oceans, Fewer tags
Categories: Publication;
Types: Citation;
Tags: Acrididae,
Africa,
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Integrated control, All tags...
Nomadacris septemfasciata,
Orthoptera,
Pest control,
Pest status,
Red locust,
Reviews,
Z 05207 Agricultural & general applied entomology, Fewer tags
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U.S. Department of the Interior
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U.S. Geological Survey
