Showing Results for
- Academic Journals (68)
Search Results
- 68
Academic Journals
- 68
-
From:Science (Vol. 227) Peer-ReviewedAt the GUA meeting, researchers presented the latest record of the changing strontium isotope composition of seawater, which can now be used to date some marine sediments laid down during the past 100 million years with...
-
From:Ground Water (Vol. 33, Issue 2) Peer-ReviewedGround-water tritium content data should be evaluated with regard to the time-versus-tritium precipitation history of the area being studied to be truly useful in estimating leachate travel time between landfills and...
-
From:Science (Vol. 288, Issue 5463) Peer-ReviewedLarge (about 5 per mil) millennial-scale benthic foraminiferal carbon isotopic oscillations in the Santa Barbara Basin during the last 60,000 years reflect widespread shoaling of sedimentary methane gradients and...
-
From:Science (Vol. 309, Issue 5737) Peer-ReviewedMicroorganisms living in anoxic rice soils contribute 10 to 25% of global methane emissions. The most important carbon source for C[H.sub.4] production is plant-derived carbon that enters soil as root exudates and...
-
From:Atlantic GeologyPeer-ReviewedIsotopic composition of lithium is potentially a powerful tracer of geochemical processes such as high-temperature magmatic differentiation, alteration of oceanic crust or fluidrock interactions. Lack of analytical...
-
From:Science (Vol. 309, Issue 5739) Peer-ReviewedFor a tree battered by its gusts, a hurricane is nothing but trouble. But it's just a welcome late summer downpour for those out of harm's way. That downpour carries with it an intriguing isotopic marker that seems to...
-
From:Alces (Vol. 37, Issue 2) Peer-ReviewedABSTRACT: Forage plants consumed by moose (Alces alces) during winter are isotopically divergent from the forage plants potentially eaten during summer. I examined the natural abundance of [sup.15]N and [sup.13]C in...
-
From:PLoS ONE (Vol. 12, Issue 2) Peer-ReviewedWe assessed the utility of stable isotope analysis as a tool for understanding community ecological structure in a species-rich clade of scincid lizards from one of the world's most diverse lizard communities. Using a...
-
From:Science (Vol. 255, Issue 5045) Peer-Reviewed
Diffusive isotopic contamination of mafic magma by coexisting silicic liquid in the Muskox intrusion
Shifts in [sup.87.Sr]/[sup.86.Sr] and [sup.143.Nd]/[sup.144.Nd] ratios measured in cumulates fromt he upper levels of the Muskox mafic intrusion indicate that isotopic and bulk chemical exchange were decoupled across a... -
From:Science (Vol. 287, Issue 5460) Peer-ReviewedA high-precision iron isotope time series for a ferromanganese crust demonstrates that the iron isotope composition in North Atlantic Deep Water has changed substantially over the past 6 million years and that iron...
-
From:Alces (Vol. 37, Issue 2) Peer-ReviewedABSTRACT: Recently, researchers emphasized that patterns of stable isotope ratios observed at the individual level are a result of an interaction between ecological, physiological, and biochemical processes. Isotopic...
-
From:PLoS ONE (Vol. 12, Issue 12) Peer-ReviewedHabitat reconstruction is commonly employed to restore degraded estuarine habitats and lost ecological functions. In this study, we use a combination of stable isotope analyses and macrofauna community analysis to...
-
From:Science (Vol. 256, Issue 5056) Peer-ReviewedMany oceanic island basalts show sublinear subparallel arrays in Sr-Nd-Pb isotopic space. The depleted upper mantle is rarely a mixing end-member of these arrays, as would be expected if mantle plumes originated at a...
-
From:American Antiquity (Vol. 60, Issue 2) Peer-ReviewedCarbon and nitrogen isotope ratios of (1) bone collagen from six burials of the Late Woodland Period at Nantucket Island, Massachusetts, and (2) a wide range of potential dietary materials provide data for evaluating...
-
From:Geoscience Canada (Vol. 34, Issue 1) Peer-ReviewedSUMMARY Geochemical and isotopic data provide insights into the origin and evolution of magmatism found at destructive plate margins. Tholeiitic magmas are dominant in the early stages of oceanic island-arc genesis...
-
From:Canadian Journal of Earth Sciences (Vol. 56, Issue 10) Peer-ReviewedStable carbon isotope geochemistry is a well-established and reliable tool for studying metabolisms of microbial communities in the Precambrian record; however, the isotopic effects of high-temperature alteration from...
-
From:Ground Water (Vol. 33, Issue 4) Peer-ReviewedA study was conducted on the impact of ground-water pumping in the Piedmont Province of Georgia. Time-series analyses was conducted on the area's environmental tritium concentrations, the stable oxygen isotopic and...
-
From:Biogeosciences (Vol. 16, Issue 2) Peer-Reviewed
The translation of the original seawater signal (i.e. ambient temperature and [delta].sup.18 O.sub.sw) into distinct chambers of a single shell of a foraminifer during calcification can influence our interpretation...
-
From:Canadian Journal of Earth Sciences (Vol. 57, Issue 3) Peer-ReviewedThe Wulong lode gold deposit is located in the Liaoning Province, northeast part of North China Craton. Gold ore bodies are mainly hosted in the Late Jurassic granite and structurally controlled by northeast-trending...
-
From:Science (Vol. 242, Issue 4884) Peer-ReviewedIsotopes in Earth Science Improvements in instrumentation have increasingly affected the ways in which research in the earth sciences is conducted. An example is a proliferation of equipment capable of providing...