Mathematics – Logic
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40.1195k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 40, Issue 10, pp.1195-1209
Mathematics
Logic
20
Scientific paper
Seventy four samples of DSDP recovered cherts of Jurassic to Miocene age from varying locations, and 27 samples of on-land exposed cherts were analyzed for the isotopic composition of their oxygen and hydrogen. These studies were accompanied by mineralogical analyses and some isotopic analyses of the coexisting carbonates. 18 O of chert ranges between 27 and 39%. relative to SMOW, 18 O of porcellanite--between 30 and 42%.. The consistent enrichment of opal-CT in porcellanites in 18 O with respect to coexisting microcrystalline quartz in chert is probably a reflection of a different temperature (depth) of diagenesis of the two phases. 18 O of deep sea cherts generally decrease with increasing age, indicating an overall cpoling of the ocean bottom during the last 150 m.y. A comparison of this trend with that recorded by benthonic foraminifera ( and , 1975) indicates the possibility of 18 O in deep sea cherts not being frozen in until several tens of millions of years after deposition. Cherts of any Age show a spread of 18 O values, increasing diagenesis being reflected in a lowering of 18 O . Drusy quartz has the lowest 18 O values. On-land exposed cherts are consistently depleted in 18 O in comparison to their deep sea time equivalent cherts. Water extracted from deep sea cherts ranges between 0.5 and 1.4 wt %. D of this water ranges between -78 and -95%. and is not a function of 18 O of the cherts (or the temperature of their formation).
Epstein Samuel
Kolodny Yehoshua
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