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

0003803 Saltzman拟议的研究将导致在内华达州东南部的箭峡谷范围内暴露的近1.3公里的石炭纪石灰岩的高分辨率（米级）d13 C地层。 阿罗峡谷范围已成为全球石炭纪的参考剖面，这是学术界、工业界和政府地质学家近40年详细工作的结果。 然而，到目前为止，几乎没有什么地球化学可以用来解决全球过程（例如，碳循环、大陆风化）。 碳同位素曲线的密西西比样品将来自钨峡的一个剖面，宾夕法尼亚部分将来自箭峡谷的剖面。 这两个部分基本上是无断层的，沿走向相隔不到10 km沿着。 以前的工作已经产生了一个详细的生物地层学框架，这两个部分使用牙形石和有孔虫，这将允许在一个带状时间尺度内的碳同位素曲线的位置。 以前在箭峡谷演替的密西西比河下游部分的碳同位素研究揭示了保存完好的趋势，可以在区域到全球范围内进行关联，这表明箭峡谷范围非常适合进行详细的地球化学调查。箭头峡谷范围内的石炭纪地层几乎完全是石灰岩，并在密西西比纪和至少两个海进-海退旋回（包括宾夕法尼亚纪的旋回沉积）期间构成了向上变浅的序列。碳同位素曲线将与北美和欧洲其他地区石炭纪生成的类似数据集相结合，以测试温室向冰库过渡期间有机碳埋藏率和河流风化通量全球变化的假设。

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.