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The chemistry of eolian quartz dust and the origin of chert


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Dulong, F.T., Cecil, C.B., and Hemingway, B.S., 2018, The chemistry of eolian quartz dust and the origin of chert: U.S. Geological Survey data release,


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 helps explain why [...]


Point of Contact :
Frank T Dulong
Originator :
Frank T Dulong, C Blaine Cecil, Bruce S Hemingway
Metadata Contact :
Eric A Morrissey
Publisher :
U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase
SDC Data Owner :
Energy Resources Program
USGS Mission Area :
Energy and Minerals

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Product_10.5066P9SA2M1L_DATA.docx 62.46 KB application/vnd.openxmlformats-officedocument.wordprocessingml.document


Describe amount, percent, of size fractions from crushed quartz after prescribed settling times.



  • Geology, Energy & Minerals (GEM) Science Center
  • USGS Data Release Products



Please see attached metadata record for full dataset provenance.

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Type Scheme Key
DOI doi:10.5066/P9SA2M1L

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