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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >High resolution OSL dating of aeolian activity at Qinghai Lake, Northeast Tibetan Plateau
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High resolution OSL dating of aeolian activity at Qinghai Lake, Northeast Tibetan Plateau

机译：高分辨率OSL在青海湖，东北藏高原青海湖中的约会

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摘要

Qinghai Lake is the largest lake on the Tibetan Plateau (TP), located between the extremely arid Qaidam Basin to the west and the severely desertified Gonghe Basin to the south. Extensive aeolian sediment at Qinghai Lake is ideal material to reconstruct regional aeolian activity, and to better understand the relationship between desertification and climatic change in the lake basin. Aeolian sand accumulation is usually accompanied by erosion, hence, depositional hiatuses and disconformities must be identified for reliable reconstruction of regional aeolian activity. To date, the low density of age sampling around Qinghai Lake has hindered identification of hiatuses. In this study we report the first high density OSL dating; 41 OSL ages were obtained from two aeolian sand sections, Dongwei (DW) and Niaodao (ND). Sand accumulation trends recorded in the high-density OSL sampling sections were consistent with previously published probability density function (PDF) ages for the northeast TP. The middle Holocene (similar to 7 to similar to 4 ka) was characterized by very low accumulation rates, with rapid sedimentation in the Late Glacial to Early Holocene (similar to 14 to similar to 7 ka) and the Late Holocene (after similar to 4 ka). A similar to 3 ka hiatus in accumulation between similar to 7 to similar to 4 ka was identified in the DW section, but the ND section showed successive accumulation since the Late Glacial (similar to 14 ka), on sub-orbital and millennial scales. Our environmental reconstructions are consistent with previously published aeolian data and paleoshorelines records. The combined evidence shows: strong aeolian activity since similar to 14 ka to similar to 9 ka; initiation of pedogenesis at similar to 9 to 7 ka; intensified soil development between similar to 7 ka and similar to 4 ka (with the most intense pedogenesis and least aeolian activity between similar to 6 to similar to 4 ka); relatively weak paleosol formation from similar to 4 to similar to 2 ka; and renewed aeolian activity after similar to 2 ka.
机译：青海湖是西藏高原（TP）最大的湖泊，位于西部的极其干旱的柴达木盆地和南部的严重荒漠化的古河流域。青海湖的广泛的Aeolian沉积物是重建区域Aeolian活动的理想材料，更好地了解湖泊池荒漠化与气候变化之间的关系。 Aeolian砂积累通常伴有侵蚀，因此必须识别沉积的中断和光盘形状，以便可靠地重建区域Aeolian活动。迄今为止，青海湖周围的年龄的低密度受到阻碍了异性的鉴定。在这项研究中，我们报告了第一个高密度OSL约会;从两种Aeolian Sand Section，Dongwei（DW）和Niaodao（ND）获得41岁。在高密度OSL抽样部分中记录的砂累积趋势与东北TP的先前公布的概率密度函数（PDF）年龄一致。中间全新世（类似于7至类似于4ka）的累积率非常低，随着早期全新世（类似于14至7 ka）和晚全新世（类似于4时）的快速沉淀K a）。在DW部分中鉴定了类似于与7至类似于4ka的累积中的3ka中断，但在亚轨道和千禧一秤上，ND部分表现出连续积累的连续积累。我们的环境重建与以前发表的Aeolian数据和古生儿记录一致。合并的证据表明：强大的Aeolian活动，因为类似于14 ka到类似于9 ka;与9至7ka类似的基础发生;与7ka相似的愈合土壤开发，与4ka相似（具有最强烈的基础，与6至类似4ka相似的最强烈的基础和最小的海湾活动）;古溶胶形成相对较弱，与4类似于2ka;与2 ka相似后更新的风中活动。

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