利用重矿物对小型洪泛平原湖泊进行源识别:华北东平湖案例研究

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES
Yingying Chen, Wenjia Li, Yanyu Ji, Bingfu Jin, Shi-Yong Yu, Shiyue Chen
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引用次数: 0

摘要

重矿物在阐明各种沉积系统的沉积物来源方面具有巨大潜力。然而,通过重矿物确定来源仍然是一个研究相对不足的方面,尤其是对小型洪泛平原湖泊而言。东平湖位于华北平原,是验证该方法有效性的理想地点。在这项研究中,我们从东平湖及周边洪泛平原采集了 31 个样本,并利用重矿物成分分析确定了东平湖源区和现代沉积物的空间分布和特征。重矿物组合显示出黄河和大汶河沉积物的显著差异。黄河冲积层样品以角闪石、闪石、褐铁矿和阳起石为主,少量石榴石、榍石、黝帘石等。来自大汶河的样品则主要为斜长石、角闪石和阳起石,以及少量榍石、黝帘石、褐铁矿、磷灰石等。我们的数据表明,东平湖的现代沉积物在重矿物组合方面表现出明显的差异。除东平湖东南部外,大部分地点的矿物组成与黄河沉积物相似,但与大汶河沉积物有明显差异。这种差异表明,黄河沉积物对东平湖现代沉积物的影响很大。湖泊现代沉积物中的粒度末端成员非混合分析也证实了这一结果。具体而言,源自黄河的物质广泛分布于湖泊各处,而源自大汶河的物质则主要集中在河口。此外,来自湖泊西岸的近距离侵蚀物质也有一定程度的影响,但主要分布在湖泊西部地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Source identification using heavy minerals for small floodplain lakes: a case study of Dongping Lake, North China

Source identification using heavy minerals for small floodplain lakes: a case study of Dongping Lake, North China

Heavy minerals offer significant potential in elucidating sediment provenance in a variety of depositional systems. Nevertheless, source identification through heavy minerals remains a relatively understudied aspect, particularly for small floodplain lakes. Located in the North China Plain, Dongping Lake represents an exceptional site for validating the efficacy of this methodology. In this study, we collected 31 samples from Dongping Lake and surrounding floodplains and used analyses of heavy mineral compositions to establish the spatial distribution and characteristics of source regions and modern sediments of Dongping Lake. The heavy mineral assemblages demonstrate significant variations for sediments of the Yellow River and the Dawen River. The Yellow River floodplain samples are dominated by hornblende, epidote, limonite, and actinolite, with minor garnet, sphene, clinozoisite, etc. Samples from the Dawen River are dominated by epidote, hornblende, and actinolite, with minor sphene, clinozoisite, limonite, apatite, etc. Our data show that modern sediments of Dongping Lake exhibit significant variations in heavy mineral assemblages. The mineralogical composition at most sites except for the southeastern part of Dongping Lake is similar to that of sediments in the Yellow River, but differs markedly from that in the Dawen River. This variation indicates that the Yellow River contributes significant volumes of sediment to modern sediments of Dongping Lake. The results are also confirmed by the grain-size end-member unmixing analysis in modern sediments of the lake. Specifically, materials derived from the Yellow River exhibit a widespread dispersion across the lake, whilst those originated from the Dawen River are primarily concentrated in the river mouth. In addition, proximally eroded materials from the west shore of the lake also have some extent of influence, but are mainly distributed in the western region of the lake.

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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
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