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Radiocarbon dating uses the decay of a radioactive isotope of carbon (14C) to measure time and date objects containing carbon-bearing material. With a half-life of 5,700 ± 30 years, detection of 14C is a useful tool for determining the age of a
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Pb isotopic compositions of sphalerite from massive ores were analyzed on a Neptune Plus MC-ICP-MS housed at the State Key Laboratory for Mineral Deposits Research at Nanjing University. In-situ Pb isotope analyses of disseminated pyrites in host rocks were performed on a Neptune Plus MC-ICP-...
Plant terrestrialization brought forth the land plants (embryophytes). Embryophytes account for most of the biomass on land and evolved from streptophyte algae in a singular event. Recent advances have unravelled the first full genomes of the closest algal relatives of land plants; among the fir...
For the mean residence time calculation, it was assumed that the initial tritium content in the atmosphere in this region was 3 TU. Most of the samples analyzed, show no tritium in their composition, indicating a mean residence time higher than 30 to 40 years (assuming 3TU as initial ...
40Ar/39Ar dating, geochemistry, and isotopic analyses of the quaternary Chichinautzin volcanic field, south of Mexico City: implications for timing, eruption rate, and distribution of volcanism 喜欢 0 阅读量: 12 作者: J.,L.,Arce,P.,W.,Layer,J.,C.,Lassiter...