Geochemical and Clay-Size Minerals Evidence for the Provenance of LQC Loess Deposits in the Central Shandong, Northern China
Geochemical and Clay-Size Minerals Evidence for the Provenance of LQC Loess Deposits in the Central Shandong, Northern China
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DOI：
10.2991/jrarc.2018.8.1.3
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发表时间：
2018-03
期刊：
影响因子：
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通讯作者：
M. Ding;Junxiang Zhang;Shuzhen Peng;Wei Zhang;Qiuyue Zhao;Longjiang Mao
中科院分区：
文献类型：
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作者：
M. Ding;Junxiang Zhang;Shuzhen Peng;Wei Zhang;Qiuyue Zhao;Longjiang Mao
黄土高原外毗邻黄河漫滩的山东黄土物源识别对于揭示沙尘堆积路径和古环境具有重要意义，引起了广泛关注。本研究对大块样品和两个粒度级（< 20μm和20~63μm）的粘土尺寸（< 5μm）矿物和主量元素组成进行了分析，以便通过与中国黄土高原黄土和黄河沉积物的比较来确定鲁中龙桥村（LQC）黄土的物源。对沉积粘土级矿物的统计分析表明，鲁中黄河漫滩附近的LQC黄土矿床不像中国黄土高原的黄土矿床那样，是直接从北方沙漠吹来的。黄河沉积物可能与黄土高原的侵蚀有关。 < 20μm和20~63μm组分中相对固定的主量元素TiO2/Al 2O3和K 2O/Al 2O3比值的差异证实了华北河流平原包括黄河漫滩的冰期出露的沉积物是主要的扬尘源，对沉积粘土级矿物进行了统计分析。
The identification of the Shandong loess provenance adjacent to the floodplain of the Yellow River external the Loess Plateau is very important for revealing the path of dust accumulation and paleoenvironment, which has aroused widespread concern. In this study, the clay-size(< 5μm) minerals and major elements composition of bulk samples and of two grain-size fractions (< 20μm and 20~63μm) were analyzed in order to determine the provenance of the LongQiaoCun(LQC) loess in the Central Shandong based on comparisons with loess from the Chinese Loess Plateau and with Yellow River sediments. Statistical analysis of the sedimentary clay-size minerals reveals that LQC loess deposits in the Central Shandong adjacent to the floodplain of the Yellow River were not blown directly from the northern deserts as is the case of loess deposits in the Chinese Loess Plateau. and the Yellow River sediments may be related to erosion from the Loess Plateau. The difference in relatively immobile major element ratios of TiO2 /Al 2O3 and K 2O/Al 2O3 of the < 20μm and 20 ~ 63μm fractions affirm that sediments exposed during glacial periods in the North China fluvial plain, including the floodplain of Yellow River, were the major dust source as the statistical analysis of the sedimentary clay-size minerals has concluded.