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首页> 外文OA文献 >Fire and Ice in Central Idaho: Modern and Holocene Fires, Debris Flows, and Climate in the Payette River Basin, and Quaternary and Glacial Geology in the Sawtooth Mountains
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Fire and Ice in Central Idaho: Modern and Holocene Fires, Debris Flows, and Climate in the Payette River Basin, and Quaternary and Glacial Geology in the Sawtooth Mountains

机译：爱达荷州中部的冰与火：佩耶特河流域的现代和全新世大火，泥石流和气候，以及锯齿山的第四纪和冰川地质

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摘要

This 2-day trip will highlight recent fire and storm-related debris flows in the Payette River region, Holocene records of fires and fire-related sedimentation events preserved in alluvial fan stratigraphic sequences, and geomorphology and geology of alpine glaciations in the spectacular Sawtooth Mountains and Stanley Basin of central Idaho. Storm events and associated scour following recent fires in the South Fork Payette basin have exposed Holocene fire-related debris-flow deposits, flood sediments, and other alluvial fan-building deposits that yield insights into Holocene environmental change. Moraine characteristics and sediment cores from the southeastern Sawtooth Mountains and Stanley Basin provide evidence of late Pleistocene alpine glaciation. A combination of these glacial records with reconstructions of regional equilibrium line elevations produces late-glacial paleoclimatic inferences for the area. Day one of the trip will examine recent and Holocene fire-related deposits along the South Fork Payette River; day two will focus on alpine glaciation in the Sawtooth Mountains (fig. 1). A description of the scope, methods, results and interpretation of the South Fork Payette fire study is given below. Background information on late Pleistocene alpine glaciation in the eastern Sawtooth Mountains is presented with the material for day 2 of the trip. The road log for day 1 of the trip begins at Banks, Idaho, and ends in Stanley, Idaho. Stop locations are shown on figure 2. At Stop 1, we will provide an introduction to interpretation of alluvial fan stratigraphic sections, and discuss the Boise Ridge fault. At Stops 2–4 (Hopkins Creek, Deadwood River, and Jughead creek), we will examine recent debrisflow deposits and Holocene alluvial fan stratigraphic sections. At Stop 5 (Helende Campground), we will look at a series of well-preserved Holocene and Pleistocene terraces and at Stop 6 (Canyon Creek), we will briefly inspect fire-related deposits in higher-elevation alluvial fan stratigraphic sections. The road log for day 2 begins at Stanley, Idaho, and ends in Sun Valley, Idaho. Stop locations are shown on figure 2. Stop 1, at Redfish Lake, will focus on regional equilibrium line altitude reconstructions and on the general pattern of late Pleistocene glaciation on the eastern flank of the Sawtooth Mountains. Stop 2 will be at Pettit Lake, where we will examine the moraine sequence and discuss relative weathering criteria and moraine groupings. At Stop 3, near Alturas Lake, we will discuss lake sediment coring, moraine chronology, and implications for latest Pleistocene paleoclimatic inferences. Stop 4 will be a brief stop at Galena Summit for an overview of the Sawtooth Mountains and a discussion of ice accumulation patterns. The trip will end at a set of moraines in the Trail Creek valley, near Sun Valley, where we will examine moraine morphology and weathering rind data that constrain the moraine ages.
机译：这次为期2天的行程将重点介绍Payette河地区近期发生的与火灾和风暴有关的泥石流，冲积扇地层序列中保存的全新世的火灾和与火灾有关的沉积事件记录以及壮观的锯齿山的高山冰川的地貌和地质和爱达荷州中部的斯坦利盆地。 South Fork Payette盆地最近发生火灾后的风暴事件和相关冲刷，暴露了全新世与火相关的泥石流沉积物，洪水沉积物以及其他冲积扇积层，这些沉积物可以使人们全面了解全新世环境变化。东南锯齿山和斯坦利盆地的冰a特征和沉积物核心提供了晚更新世高山冰期的证据。这些冰川记录与区域平衡线高程的重建相结合，产生了该地区的晚冰川古气候推断。行程的第一天将检查南福克佩耶特河沿岸近期和全新世的与火相关的沉积物；第二天的重点是锯齿山的高山冰川（图1）。下面给出了对南叉Payette火研究的范围，方法，结果和解释的说明。随旅行第二天的材料介绍了东部锯齿山晚更新世高山冰川的背景信息。行程第一天的路标始于爱达荷州的班克斯，结束于爱达荷州的斯坦利。停止位置如图2所示。在停止1，我们将介绍冲积扇地层剖面的解释，并讨论博伊西岭断层。在2-4站（霍普金斯溪，戴德伍德河和朱格黑德河），我们将检查最近的泥石流沉积物和全新世冲积扇层地层。在5号车站（海伦德露营地），我们将看到一系列保存完好的全新世和更新世阶地；在6号车站（峡谷溪），我们将简要检查高海拔冲积扇地层中与火灾有关的沉积物。第2天的路标始于爱达荷州的斯坦利，结束于爱达荷州的太阳谷。站点位置如图2所示。在Redfish Lake的站点1，将重点关注区域平衡线高度的重建以及锯齿山脉东侧晚更新世冰川的总体格局。第二站将在佩蒂特湖，我们将检查冰ora序列并讨论相对的风化标准和冰m分组。在Alturas湖附近的Stop 3，我们将讨论湖泊沉积物取芯，冰ora年代学及其对最新更新世古气候推断的影响。第4站将是Galena峰会的短暂停留，概述了锯齿山并讨论了冰的堆积方式。这次旅行将在太阳谷附近的特雷克里克山谷的一组冰mo结束，我们将在其中检查冰ora的形态和风化的果皮数据，这些数据限制了冰age的年龄​​。

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