The. delta. sup 18 O record of Phanerozoic abiotic marine calcite cements
- Univ. of Michigan, Ann Arbor (USA)
Monomineralic, abiotic marine cements formed in low-latitude Phanerozoic reefs provide the direction and amplitude of secular variation of {delta}{sup 13}C and {delta}{sup 18}O in marine calcite and defines two end member compositions - 580 to 360 my ({minus}7 to {minus}5{per thousand}{delta}{sup 18}O{sub PDB}) and 360 to present ({minus}3 to 0{per thousand}{delta}{sup 18}O{sub PDB}). Sampling of the Devono-Carboniferous transition (375-320 my) at several global sites reveals a rapid change in carbonate isotopic compositions. Bracketed within Fammenian to Early Visean-aged strata, a 7 to 15 my time interval, this shift corresponds to a 2% offset in mean {delta}{sup 13}C and 3-4% offset in {delta}{sup 18}O. The abruptness of such change, and its overall correlation with variations in {sup 87}Sr/{sup 86}Sr, {delta}{sup 34}S, {delta}{sup 13}C, and Li/Al ratios in marine sediments suggests a primary offset in marine water composition.
- OSTI ID:
- 5599459
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 16:4; ISSN 0094-8276; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
580000* -- Geosciences
AGE ESTIMATION
ALKALI METALS
ALKALINE EARTH ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM
BETA DECAY RADIOISOTOPES
BOUNDARY CONDITIONS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON 13
CARBON COMPOUNDS
CARBON ISOTOPES
CARBONATE MINERALS
CARBONATE ROCKS
CARBONATES
CARBONIFEROUS PERIOD
DEVONIAN PERIOD
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPE RATIO
ISOTOPES
LIGHT NUCLEI
LITHIUM
METALS
MINERALS
NUCLEI
OXYGEN 18
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
PALEOZOIC ERA
QUANTITY RATIO
RADIOISOTOPES
REEFS
ROCKS
SAMPLING
SEAS
SEDIMENTARY ROCKS
SEDIMENTS
STABLE ISOTOPES
STRONTIUM 86
STRONTIUM 87
STRONTIUM ISOTOPES
SULFUR 34
SULFUR ISOTOPES
SURFACE WATERS
VARIATIONS