Holocene records of eolian dust deposition from high‐elevation lakes in the Uinta Mountains, Utah, USA
Holocene records of eolian dust deposition from high‐elevation lakes in the Uinta Mountains, Utah, USA
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美国犹他州尤因塔山脉高海拔湖泊的全新世风尘沉积记录
DOI：
10.1002/jqs.3250
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发表时间：
2021
影响因子：
2.3
通讯作者：
Wasson, Luna
中科院分区：
文献类型：
--
作者：
Munroe, Jeffrey S.;McElroy, Ryan;O'Keefe, Sam;Peters, Andrew;Wasson, Luna
来自亚高山湖泊的放射性碳测年沉积物岩心被用来调查Uinta山脉(美国犹他州)的冰后尘埃沉积。采用电感耦合等离子体发射光谱、电感耦合等离子体质谱和X射线荧光岩心扫描等方法对湖泊沉积物进行了地球化学特征分析。被动采样器收集的样品限制了现代粉尘的性质，风化岩样限制了分水岭内当地材料的性质。灰尘中Ca、Eu含量较高，而局部风化土中Ti、Zr含量较高。因此，Ca/Ti和Eu/Zr比值可作为反映湖泊沉积物含尘量的指标。在所有的记录中，沙尘指数在全新世早期上升，因为流域用植被稳定下来，减少了当地物质的流入。在这一点之后，数值在整个全新世中期一直高于平均水平，这与沉积物中尘埃含量的增加是一致的。大多数湖泊的尘埃指数值在全新世晚期下降，表明尘埃丰度下降。一般来说，该山脉不同地区湖泊岩心中尘埃指数值的同步变化是该地区在中全新世期间尘埃沉积增强的证据，并与美国西南部此时干旱加剧的各种记录一致。
Radiocarbon‐dated sediment cores from subalpine lakes were used to investigate post‐glacial dust deposition in the Uinta Mountains (Utah, USA). Lake sediments were geochemically characterized with ICP‐OES, ICP‐MS and XRF core scanning. Collections from passive samplers constrain the properties of modern dust, and samples of regolith constrain properties of the local material within the watershed. Ca and Eu are more abundant in dust, whereas Ti and Zr are more abundant in local regolith. As a result, the Ca/Ti and Eu/Zr ratios are indices for the dust content of lake sediment. In all records, the dust index rises in the early Holocene as watersheds became stabilized with vegetation, reducing the influx of local material. After this point, values remained above average through the middle Holocene, consistent with an increased dust content in the sediment. Dust index values drop in the late Holocene in most lakes, suggesting a decrease in dust abundance. Generally synchronous shifts in dust index values in cores from lakes in different parts of this mountain range are evidence of enhanced dust deposition in this region during the middle Holocene, and are consistent with a variety of records for increased aridity in the south‐western USA at this time.
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影响因子：
6.1
作者：
P. Rea;Lin Ma;T. Gill;J. Gardea-Torresdey;C. Tamez;Lixin Jin
通讯作者：
P. Rea;Lin Ma;T. Gill;J. Gardea-Torresdey;C. Tamez;Lixin Jin
影响因子：
3.4
作者：
J. Munroe;D. Mickelson
通讯作者：
J. Munroe;D. Mickelson
DOI：
10.1016/j.palaeo.2015.08.026
发表时间：
2015-11
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Lisbeth A. Louderback;David Rhode;D. Madsen;Michael Metcalf
通讯作者：
Lisbeth A. Louderback;David Rhode;D. Madsen;Michael Metcalf
影响因子：
5.4
作者：
S. Skiles;T. Painter;J. Deems;A. C. Bryant;C. Landry
通讯作者：
S. Skiles;T. Painter;J. Deems;A. C. Bryant;C. Landry
影响因子：
3.3
作者：
J. Munroe;E. Norris;G. Carling;B. Beard;A. Satkoski;Lianwen Liu
通讯作者：
J. Munroe;E. Norris;G. Carling;B. Beard;A. Satkoski;Lianwen Liu