Flood events in the lower reaches of the Yellow River: OSL and radiocarbon dating on the Anshang site

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Songna Wang , Xiaodong Miao , Tianyu Shi
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Abstract

The lower reaches of the Yellow River have witnessed numerous episodes of flooding and considerable shifts in its course. Examining flood records within the Yellow River basin offers invaluable insights into ancient human settlements, agricultural practices, trade routes, and technological advancements of ancient Chinese civilizations. However, dating these fluvial sediments poses a considerable challenge due to either the scarcity of organic material for radiocarbon (14C) dating or the potential incomplete bleaching of sediments for optically stimulated luminescence (OSL) techniques. This study focused on the Anshang site located in Henan Province, we obtained OSL ages from distinct grain size fractions of quartz and cross-verified them with independent acceleration mass spectrometry (AMS) 14C ages. The findings revealed that both coarse quartz grains (CG) and medium quartz grains (MG) underwent complete bleaching in silt-dominated flood deposits and shallow lacustrine deposits. Conversely, the OSL ages of CG and MG quartz were notably overestimated by approximately 3–6 ka in silty clay-dominated flood deposits. Upon comparing the OSL ages with AMS 14C ages, it was evident that bulk organic matter AMS 14C ages aligned with CG OSL ages in shallow lacustrine deposits, but they appeared older than CG OSL ages in flood deposits. However, the AMS 14C ages from plant demonstrated good consistency. Consequently, we successfully identified flood-lacustrine sediments dating back to approximately ∼13 ka, ∼8–3 ka, ∼2.6 ka, ∼1 ka, and the last few hundred years, aligning well with historical documentation and earlier research. The regional evidence presented herein enhances our understanding of the applicability of OSL dating and AMS 14C dating in fluvial-lacustrine sediments. Armed with these new ages, we constructed a reference chronology for archaeological localities situated in the fluvial sediments of the lower reaches of the Yellow River.

黄河下游的洪水事件:安上遗址的OSL和放射性碳年代测定
黄河下游曾多次发生洪水泛滥,河道也发生了巨大变化。研究黄河流域的洪水记录为了解古人类的居住地、农业生产方式、贸易路线和中国古代文明的技术进步提供了宝贵的资料。然而,由于缺乏用于放射性碳(C)测年的有机材料,或由于光激发发光(OSL)技术可能导致沉积物漂白不完全,因此对这些河道沉积物进行测年是一项相当大的挑战。本研究以位于河南省的安商遗址为重点,我们从不同粒度的石英碎片中获得了 OSL 年龄,并与独立的加速质谱(AMS)C 年龄进行了交叉验证。研究结果表明,在以淤泥为主的洪积沉积和浅湖沉积中,粗石英粒(CG)和中石英粒(MG)都经历了完全漂白。相反,在淤泥质粘土为主的洪积层中,CG 和 MG 石英的 OSL 年龄被明显高估了约 3-6 ka。在将 OSL 年龄与 AMS C 年龄进行比较后发现,在浅湖相沉积中,块状有机质的 AMS C 年龄与 CG OSL 年龄一致,但在洪积沉积中则比 CG OSL 年龄大。不过,植物的 AMS C 年龄显示出很好的一致性。因此,我们成功地确定了洪积-湖积沉积物的年代,可追溯到大约 ∼13 ka、∼8-3 ka、∼2.6 ka、∼1 ka 以及最近的几百年,与历史文献和早期研究非常吻合。本文提供的区域证据增强了我们对OSL年代测定和AMS C年代测定在河流-湖积沉积物中的适用性的理解。有了这些新的年代,我们为位于黄河下游河流沉积物中的考古地点构建了一个参考年表。
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来源期刊
Quaternary International
Quaternary International 地学-地球科学综合
CiteScore
5.60
自引率
4.50%
发文量
336
审稿时长
3 months
期刊介绍: Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.
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