نتایج جستجو برای: lead isotopes
تعداد نتایج: 362795 فیلتر نتایج به سال:
Introduction: The age significance of isotope chronometers in basaltic shergottites is not agreed yet [1-3]. Bouvier et al. [3] argued that crystallization ages of shergottites were old (~4.1 Ga), and suggested that young ages of shergottites (i.e., ~180 Ma) represent reset by shock metamorphism. Baddeleyite (ZrO 2) is an important mineral for U-Pb dating of basaltic shergottites. By compressio...
Although Japan has been considered to have little lead (Pb) pollution in modern times, the actual pollution situation is unclear. The present study aims to investigate the extent of Pb pollution and to identify the pollution sources in Japan using stable Pb isotope analysis with kidneys of wild rats. Wild brown (Rattus norvegicus, n = 43) and black (R. rattus, n = 98) rats were trapped from var...
Abstract Atmospheric dust is an important mass transfer and nutrient supply process in Earth surface ecosystems. For decades, Saharan has been hypothesized as a supplier of nutrients to the Amazon rainforest eastern North America. However, isotope studies aimed at detecting American sedimentary record have ambiguous. A large storm emerged off coast Africa June 2020 extended into southeastern Un...
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