Sentences with phrase «analyzed oxygen isotope»
To better understand the cycle of magma production, the researchers analyzed oxygen isotope ratios in quartz and zircon, water - and heat - resistant minerals, from volcanic rocks in the Yellowstone caldera.
http://www.sciencemag.org/
When the researchers analyzed the oxygen isotope ratios over the past 8,000 years, they found that the jet stream became wavier — with colder Eastern winter weather and warmer Western winter weather — on about a 4,000 - year cycle.
Not exact matches
The rover's Sample Analysis at Mars (SAM) instrument that analyzes the soil and atmosphere around the rover using a mass spectrometer, a gas chromatograph and a tunable laser spectrometer to detect oxygen and carbon isotopes in carbon dioxide and methane samples to see if they are biochemical in origin.
Both the eggshells and the embryo bones were analyzed in order to determine their oxygen isotope composition.
By analyzing isotopes of oxygen preserved in herbivore teeth and tusks, they can quantify the aridity of the region and compare it to indicators of plant type and herbivore diet.
Retired University of Wisconsin, Madison, archaeologist Doug Price analyzed strontium, oxygen, and carbon isotopes in 20 teeth from Tollense.
By carefully micro-sampling each shell along its direction of growth and analyzing for stable carbon and oxygen isotopes and trace elements, the team reconstructed a record of seasonal variation during the lifetimes of the organisms.
Mark, who focuses on the Andes region, developed a method of determining how much of a community's water supply is glacier - fed by analyzing the hydrogen and oxygen isotopes in water samples.
Back at their Georgia Tech lab, they analyzed the stalagmites for the ratio of oxygen isotopes contained in samples of calcium carbonate, the material from which the stalagmites were formed.
«When I was watching CSI: New York the other night, I saw they were going to analyze a pond water sample for the oxygen isotopes.
One group of students has been drilling modern and fossil teeth to obtain samples that will be analyzed to examine stable carbon and oxygen isotope ratios.
We analyzed stable carbon and oxygen isotopes (δ13C, δ18O) of decade - old California mussel shells (Mytilus californianus) in the context of an instrumental seawater record of the same length.
The scientists analyzed the ratio of the oxygen isotopes in the hydration water and in the calcium carbonate.
In a recent study, a team of investigators analyzed oxygen - 18 isotopes (δ18O) from the otoliths — or ear bones — from archeological Pacific cod (dating about 1790 - 1920) to reconstruct nearshore temperature regimes in the Gulf of Alaska.
Calcareous nannofossils from approximately the past 7000 yr of the Holocene and from oxygen isotope stage 5 are present at 39 analyzed sites in the central Arctic Ocean.
Broecker used changes in oxygen isotopes in deep - sea cores, analyzed by Emliani during 1955 - 1966, to point out the sawtooth nature of glacial cycles — a slow cooling followed by rapid warming.
Shell material was analyzed for stable isotopes of carbon (δ13C) and oxygen (δ18O) in the Earth Systems History Laboratory at Brown University (Providence, RI).
The researchers routinely analyze ice cores for a host of indicators — particulates, dust, oxygen isotopes, etc. — that can paint a picture of past climate in that region.