Collaborative Research: High-Precision U-Pb Zircon Geochronology of the Late Triassic Chinle Fluvial System of the Colorado Plateau

合作研究：Colorado高原晚三叠世Chinle河系高精度U-Pb锆石年代学（amuel Bowring， MIT, ar - 10241996） david Fastovsky, university of Rhode Island， ar -1023788摘要：我们提出了美国西南部晚三叠世Chinle组凝灰岩高精度U-Pb锆石年代学研究项目。Chinle是一个河流沉积序列，保存了丰富的化石记录，揭示了恐龙动物群的优势地位和现代生物群的形成。然而，重建中国记录的古环境和生物进化的速度和模式一直存在问题。这主要是因为虽然已经建立了详细的岩石地层学和生物地层学，但它们在地质年代学上没有得到很好的校准。像PIs提出的那样，对中国主要化石露头进行高分辨率同位素定年，将使其包含的丰富信息能够整合到全球三叠纪时间尺度中。Chinle保存了地球历史上一个关键时期陆地生物进化和古气候的独特记录。它的序列生物地层组合，被编纂为陆地脊椎动物动物纪，是理解早期恐龙在一个显著环境变化时期进化的核心。提出的中国岩石和生物地层学的高精度时间定标将大大提高它们的实用性，并将使它们融入全球晚三叠世时间尺度。EARTHTIME标准和示踪剂解决方案将用于促进实验室之间的比较。这项工作与一个国家公园有关，每年可能会有50万名游客以解释性展览和文献的形式接触到这项研究的结果，这些游客来自各种各样的人群。pi还致力于教育居住在这片土地上的美洲原住民社区，这也是研究的部分主题。

Collaborative Research: High-Precision U-Pb Zircon Geochronology of the Late Triassic Chinle Fluvial System of the Colorado PlateauSamuel Bowring, MIT, EAR-1024196David Fastovsky, Univ. Rhode Island, EAR-1023788 ABSTRACTPIs propose a program of high-precision U-Pb zircon geochronology on tuffaceous rocks preserved in the Late Triassic Chinle Formation of the southwestern United States. The Chinle is a fluvial sedimentary sequence that preserves a rich fossil record that reveals the ascendancy of dinosaur faunas and the shaping of the modern biota. Reconstructing the tempo and mode of paleoenvironmental and biotic evolution recorded in the Chinle, however, has been problematic. This is largely because although a detailed lithostratigraphy and biostratigraphy have been constructed, they are not well calibrated geochronologically. High-resolution isotopic dating of key fossiliferous Chinle outcrops, such as PIs propose, would allow the wealth of information that it contains to be integrated into the global Triassic timescale. The Chinle preserves a unique record of terrestrial biotic evolution and paleoclimate in a critical time interval of Earth history. Its sequential biostratigraphic assemblages, codified as Land Vertebrate Faunachrons, are core to the understanding of the early dinosaur evolution during a period of remarkable environmental change. Proposed high-precision temporal calibration of the Chinle litho- and bio-stratigraphy will greatly enhance their utility and will allow their integration into the global late Triassic time scale. EARTHTIME standards and tracer solutions will be used facilitating comparison between labs. The work proposed is associated with a national park with the potential of exposing an estimated 500,000 visitors per year from a wide spectrum of people to the results of this study in the form of interpretive exhibits and literature. PIs are also committed to the education of Native American communities who inhabit the land which is in part the subject of the research.