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Stable isotope geochemistry of deep sea cherts

Abstract

Seventy four samples of DSDP (Deep Sea Drilling Project) 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. delta/sup 18/0 of chert ranges between 27 and 39 parts per thousand relative to SMOW, delta/sup 18/0 of porcellanite - between 30 and 42 parts per thousand. The consistent enrichment of opal-CT in porcellanites in /sup 18/0 with respect to coexisting microcrystalline quartz in chert is probably a reflection of a different temperature (depth) of diagenesis of the two phases. delta/sup 18/0 of deep sea cherts generally decrease with increasing age, indicating an overall cooling of the ocean bottom during the last 150 m.y. A comparison of this trend with that recorded by benthonic foraminifera (Douglas et al., Initial Reports of the Deep Sea Drilling Project; 32:509(1975)) indicates the possibility of delta/sup 18/0 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 delta/sup 18/0 values, increasing diagenesis being reflected in a lowering  More>>
Authors:
Kolodny, Y; Epstein, S [1] 
  1. California Inst. of Tech., Pasadena (USA). Div. of Geological Sciences
Publication Date:
Oct 01, 1976
Product Type:
Journal Article
Reference Number:
AIX-08-281111; EDB-77-038997
Resource Relation:
Journal Name: Geochim. Cosmochim. Acta; (United Kingdom); Journal Volume: 40:10
Subject:
58 GEOSCIENCES; SEDIMENTARY ROCKS; GEOCHEMISTRY; CARBONATES; DEUTERIUM; GEOLOGIC DEPOSITS; HYDROGEN; ISOTOPE RATIO; MINERALOGY; OXYGEN; OXYGEN 18; SEA BED; SEAS; SILICON OXIDES; UNDERWATER; CARBON COMPOUNDS; CHALCOGENIDES; CHEMISTRY; CRYOGENIC FLUIDS; ELEMENTS; EVEN-EVEN NUCLEI; FLUIDS; HYDROGEN ISOTOPES; ISOTOPES; LEVELS; LIGHT NUCLEI; NONMETALS; NUCLEI; ODD-ODD NUCLEI; OXIDES; OXYGEN COMPOUNDS; OXYGEN ISOTOPES; ROCKS; SILICON COMPOUNDS; STABLE ISOTOPES; SURFACE WATERS; 580400* - Geochemistry- (-1989)
OSTI ID:
7323851
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: GCACA
Submitting Site:
INIS
Size:
Pages: 1195-1209
Announcement Date:

Citation Formats

Kolodny, Y, and Epstein, S. Stable isotope geochemistry of deep sea cherts. United Kingdom: N. p., 1976. Web. doi:10.1016/0016-7037(76)90155-1.
Kolodny, Y, & Epstein, S. Stable isotope geochemistry of deep sea cherts. United Kingdom. doi:10.1016/0016-7037(76)90155-1.
Kolodny, Y, and Epstein, S. 1976. "Stable isotope geochemistry of deep sea cherts." United Kingdom. doi:10.1016/0016-7037(76)90155-1. https://www.osti.gov/servlets/purl/10.1016/0016-7037(76)90155-1.
@misc{etde_7323851,
title = {Stable isotope geochemistry of deep sea cherts}
author = {Kolodny, Y, and Epstein, S}
abstractNote = {Seventy four samples of DSDP (Deep Sea Drilling Project) 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. delta/sup 18/0 of chert ranges between 27 and 39 parts per thousand relative to SMOW, delta/sup 18/0 of porcellanite - between 30 and 42 parts per thousand. The consistent enrichment of opal-CT in porcellanites in /sup 18/0 with respect to coexisting microcrystalline quartz in chert is probably a reflection of a different temperature (depth) of diagenesis of the two phases. delta/sup 18/0 of deep sea cherts generally decrease with increasing age, indicating an overall cooling of the ocean bottom during the last 150 m.y. A comparison of this trend with that recorded by benthonic foraminifera (Douglas et al., Initial Reports of the Deep Sea Drilling Project; 32:509(1975)) indicates the possibility of delta/sup 18/0 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 delta/sup 18/0 values, increasing diagenesis being reflected in a lowering of delta/sup 18/0. Drusy quartz has the lowest delta/sup 18/0 values. On land exposed cherts are consistently depleted in /sup 18/0 in comparison to their deep sea time equivalent cherts. Water extracted from deep sea cherts ranges between 0.5 and 1.4 wt%. deltaD of this water ranges between -78 and -95 parts per thousand and is not a function of delta/sup 18/0 of the cherts (or the temperature of their formation).}
doi = {10.1016/0016-7037(76)90155-1}
journal = {Geochim. Cosmochim. Acta; (United Kingdom)}
volume = {40:10}
journal type = {AC}
place = {United Kingdom}
year = {1976}
month = {Oct}
}