Other
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3265s&link_type=abstract
Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 56, no. 8, Aug. 1992, p. 3265-3272.
Other
15
Chemical Reactions, Periodic Variations, Precambrian Period, Silicon Dioxide, Geochemistry, Interstitials, Sedimentary Rocks, Weathering
Scientific paper
The silica cycle in the Precambrian is reconstructed mainly from inorganic reactions, with due consideration for interactions with the biosphere insofar as they result in silica-organic matter reaction. No evidence is found for deposition of a layered amorphous silica, but abundant evidence exists for diagenetic silicification in the Neoproterozoic, the time period under analysis. The evidence of Neoproterozoic rocks favors tectonic and weathering regimes similar to those of the early Phanerozoic and hydrothermal inputs significantly altered at certain periods. One flux would have been very different: the present diffusional influx from interstitial waters into the oceans would have been altered to an efflux from the oceans to interstitial waters. Reactions of dissolved silica with inorgnic phases would have controlled silica concentrations at a level of about 60 pm. It is argued that the major removal of silica from the Neoproterozoic ocean took place by diagenetic reactions.
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