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[1] The toxicity of mercury’s methylated species and its biomagnification in aquatic food chains and global dispersion by the atmosphere are the cause of worldwide health problems. Recent reports have observed natural mass-dependent fractionation in mercury isotopes, and recent theoretical work has demonstrated that isotopic separation in mercury is due(More)
Stable isotope analyses of fossil teeth and other authigenic minerals have been used to reconstruct the paleoenvironment and paleoelevation of the Tibetan Plateau. The accuracy of such reconstructions is limited by the lack of a comprehensive modern comparative database from the region. We analyzed the carbon and oxygen isotopic compositions (δC and δO(More)
The timing history and driving mechanisms of C4 expansion and Tibetan uplift are hotly debated issues. Paleoenvironmental evidence from within the Tibetan Plateau is essential to help resolve these issues. Here we report results of stable C and O isotope analyses of tooth enamel samples from a variety of late Cenozoic mammals, including deer, giraffe,(More)
a Department of Geological Sciences, Florida State University and National High Magnetic Field Laboratory, Tallahassee, FL 32306-4100, USA b Laboratory of Evolutionary Systematics of Vertebrates, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, 100044, PR China c Department of Vertebrate Paleontology, Natural(More)
a Department of Earth, Ocean & Atmospheric Science, Florida State University, Tallahassee, FL 32306, USA b National High Magnetic Field Laboratory, Tallahassee, FL 32306-4100, USA c Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA d Department of Vertebrate Paleontology, Natural History Museum of Los Angeles(More)
The linkage between tectonic forces and climate evolution remains a matter of much debate and speculation. Here we present high-resolution oxygen and carbon isotope data from an ancient lake basin in the central Himalaya. These data, together with sedimentologic evidence, reveal major changes in drainage systems and depositional settings at 7.2, 5.5 and 3.2(More)
To examine paleodiets and habitats of extinct taxa and to understand long-term regional climate change, we determined the carbon and oxygen isotopic compositions of fossil herbivore teeth and soil samples from six localities in Yunnan Province, Southwest China, ranging in age from 10 Ma to the present. Although limited in spatial and temporal coverage,(More)
Quantifying and predicting the food web consequences of anthropogenic changes is difficult using traditional methods (based on gut content analysis) because natural food webs are variable and complex. Here, stable and radioactive carbon isotopes are used, in conjunction with nitrogen isotopes and mercury (Hg) concentration data, to document the effects of(More)
Late Holocene paleoclimate records from coastal regions are important for understanding long-term variability of hurricane activity. Here we present a nearly 4000-year record of severe storm landfalls and environmental changes based on organic geochemical proxies (OGPs) preserved in sediment cores from two coastal lakes in northwest Florida. Our analysis(More)