Carbon Isotope Stratigraphy of the Carboniferous in the Arrow Canyon Range, Southeastern Nevada: Reconstructing Carbon Cycling during a Greenhouse-Icehouse Transition

内华达州东南部箭峡谷山脉石炭系的碳同位素地层学：在温室-冰库转变期间重建碳循环

• 批准号: 0003803
• 负责人: Matthew Saltzman
• 金额: $ 7.05万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0003803&HistoricalAwards=false
• 关键词: Carbon; Isotope; Stratigraphy; Carboniferous; Arrow

0003803Saltzman The proposed research will result in a high-resolution (meter-scale) d13C stratigraphy for nearly 1.3 km of Carboniferous limestones exposed in the Arrow Canyon Range in southeastern Nevada. The Arrow Canyon Range has served a global reference section for the Carboniferous as a result of nearly 40 years of detailed work by academic, industry and government geologists. However, little geochemistry has been done to this point that can be used to address global processes (e.g., carbon cycling, continental weathering). The Mississippian samples for the carbon isotope curve will come from a section at Tungsten Gap and the Pennsylvanian portion will come from the section at Arrow Canyon. The two sections are essentially unfaulted and separated by less than 10 km along strike. Previous work has produced a detailed biostratigraphic framework for both sections using conodont and foraminifers, which will allow for the placement of the carbon isotope curve within a zonal time scale. Previous carbon isotope study in the Lower Mississippian portion of the Arrow Canyon succession has revealed well-preserved trends that can be correlated on a regional to global scale, indicating that the Arrow Canyon Range is well-suited for a detailed geochemical investigation. Carboniferous formations in the Arrow Canyon Range are almost entirely limestone, and make up an upward-shallowing succession during the Mississippian and at least two transgressive-regressive cycles, including cyclothemic deposition, during the Pennsylvanian. The carbon isotope curve will be integrated with similar data sets generated for the Carboniferous elsewhere in North America and Europe in order to test hypotheses about global changes in organic carbon burial rates and riverine weathering fluxes during a Greenhouse to Icehouse transition.

0003803SALTZMAN提出的研究将导致高分辨率（仪表）D13C地层，以近1.3公里的石炭纪石灰岩暴露在内华达州东南部的箭峡谷范围内。 由于学术，工业和政府地质学家的详细工作，箭峡谷系列为石炭纪的全球参考部分提供了全球参考部分。 但是，到目前为止，几乎没有进行地球化学，该地球化学可用于解决全球过程（例如碳循环，大陆风化）。 碳同位素曲线的密西西比州样品将来自Tungsten Gap的一个部分，宾夕法尼亚州的部分将来自Arrow Canyon的该部分。 这两个部分基本上是不欠款的，并且在罢工期间距离不到10公里。 先前的工作已经使用牙形和有孔虫为这两个部分生成了详细的生物地层框架，这将允许在区域时间尺度内放置碳同位素曲线。 以前在密西西比州下部箭头峡谷部分中的碳同位素研究揭示了保存完好的趋势，这些趋势可以在区域与全球规模上相关，表明箭峡谷范围非常适合详细的地球化学研究。箭峡谷范围内的石炭纪地层几乎完全是石灰岩，在密西西比州和至少两个侵入性的回火周期中，构成了向上散发的继承，包括宾夕法尼亚州的旋风沉积。碳同位素曲线将与为北美和欧洲其他地方的石炭纪产生的类似数据集集成，以测试有关有机碳埋葬率的全球变化的假设以及在温室到冰屋过渡期间的河流埋葬率和河流风化的通量。