Tectonic, hydrogeologic, and climatic controls on Late Holocene dune formation, China Lake basin, Indian Wells Valley, California, USA

Tectonic, hydrogeologic, and climatic controls on Late Holocene dune formation, China Lake basin, Indian Wells Valley, California, USA
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美国加利福尼亚州印第安维尔斯谷中国湖盆地的构造、水文地质和气候对全新世晚期沙丘形成的控制

DOI:
10.1017/qua.2021.62
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发表时间:
2022
影响因子:
2.3
通讯作者:
Boggs, Matthew L.
Boggs, Matthew L.
中科院分区:
地球科学3区
文献类型:
--
作者:
Lancaster, Nicholas;Bacon, Steven N.;Bullard, Thomas F.;Neudorf, Christina M.;Keen-Zebert, Amanda K.;Decker, David L.;Boggs, Matthew L.

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通过对中国湖盆的断裂构造、水文地质、地层学、沉积学研究以及风成沉积物的释光测年分析,对加州东部地震活跃的印第安威尔斯河谷晚全新世沙丘和沙坡的起源和发展提供了新的认识。风成沙丘和砂席沉积物来源于内华达州东南部山脉花岗岩的冲积物,集中在具有固沙潜水植物植被的地区,这些植被受沿沿着活跃的正常小湖和帕克斯顿牧场断层的高地下水位的影响,这些断层在当地形成了地下水流的屏障。三个事件的沙积累被确认(2.1 ± 0.1 ~ 2.0 ± 0.1ka,1.8 ± 0.2 ~ 1.6 ± 0.2ka,1.2 ± 0.1 ~ 0.9 ± 0.1ka)在降雨和径流增加期间向盆地提供的沉积物随后被风重新加工成沙丘和沙坡的条件下,时期了解构造在影响地震活跃湖盆水文地质方面所起的作用,可以为准确解释景观演变和对一个地区过去水文气候变化所作的任何推断提供见解。
Analysis of patterns of faulting and hydrogeology, stratigraphic and sedimentologic studies, and luminescence dating of aeolian deposits in China Lake basin provide new perspectives on the origins and development of Late Holocene dunes and sand ramps in the seismically active Indian Wells Valley of eastern California. Aeolian dune and sand sheet deposits were sourced from alluvial material derived from granitic rocks of the south-eastern Sierra Nevada and are concentrated in areas with sand-stabilizing phreatophyte vegetation influenced by high groundwater levels along the active oblique-normal Little Lake and Paxton Ranch faults, which locally form barriers to groundwater flow. Three episodes of sand accumulation are recognized (2.1 ± 0.1 to 2.0 ± 0.1 ka, 1.8 ± 0.2 to 1.6 ± 0.2 ka, and 1.2 ± 0.1 to 0.9 ± 0.1 ka) during conditions in which sediment supplied to the basin during periods of enhanced rainfall and runoff was subsequently reworked by wind into dunes and sand ramps at the transition to more arid periods. Understanding the role tectonics plays in influencing the hydrogeology of seismically active lake basins provides insights to accurately interpret landscape evolution and any inferences made on past hydroclimate variability in a region.
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