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Carbon isotope geochemistry and geobiology
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Desmarais, D. |
| Copyright Year | 1985 |
| Description | Carbon isotope fractionation values were used to understand the history of the biosphere. For example, plankton analyses confirmed that marine extinctions at the end of the Cretaceous period were indeed severe (see Hsu's article in Sundquist and Broeker, 1984). Variations in the isotopic compositions of carbonates and evaporitic sulfates during the Paleozoic reflect the relative abundances of euxinic (anoxic) marine environments and organic deposits from terrestrial flora. The carbon isotopic composition of Precambrian sediments suggest that the enzyme ribulose bisphosphate carboxylase has existed for perhaps 3.5 billion years. |
| File Size | 269505 |
| Page Count | 7 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19850024403 |
| Archival Resource Key | ark:/13960/t2r54hh29 |
| Language | English |
| Publisher Date | 1985-07-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Precambrian Period Earth Atmosphere Geobotany Earth Mantle Shales Carbon Dioxide Geochemistry Igneous Rocks Organisms Ecology Carbon Cycle Earth Crust Sedimentary Rocks Biosphere Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
