A SUMMARY OF RADIOCARBON MEASUREMENTS OF FLUVIAL AND COLLUVIAL DEPOSITS IN CATCHMENTS OF SOUTH-CENTRAL ONTARIO, CANADA

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2024-02-13 DOI:10.1017/rdc.2024.2
William C Mahaney, Andrew M Stewart
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Abstract

Fluvial and colluvial deposits of Late Holocene age in South-Central Ontario catchments have provided few 14C dates, most by conventional methods registering century-old ages. Other young deposits, dated by conventional and accelerator mass spectrometry radiocarbon (AMS 14C), have yielded bomb-affected post-1950 ages over variable time limits. Attempts to date the base of Ah and lower-in-section soil horizons, in Early to Late Holocene stream terrace deposits, have yielded atomic bomb effects. Comparing bomb contamination in Late Holocene fluvial deposits, using both conventional and AMS methods, identifies a mix of bomb-affected beds juxtaposed with dated beds, the latter yielding ages with narrow standard deviations. Colluvial deposits overlying key glacial sections in the Rouge Catchment, while rare, yield bracketed AMS ages for an Ahbk horizon that refines weathering times relative to previously obtained conventional 14C dates. Bomb-affected sediment appears variably distributed within floodplain soils and in the ground soil of a colluvial section. Mass wasted deposits, with AMS 14C ages spread over the last few centuries, appear related to Little Ice Age (LIA) changes in climate, corroborated by pollen records. Further, these AMS-14C dated beds calibrate weathering of secondary Fe-Al oxihydroxides over the first half a millennium of weathering time.
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加拿大安大略省中南部集水区河流和冲积沉积物放射性碳测量概要
安大略省中南部集水区全新世晚期的冲积层和胶积层沉积物提供的 14C 测定日期很少,大多数是用传统方法测得的百年年龄。用常规方法和加速器质谱放射性碳(AMS 14C)测定的其他年轻沉积物的年代,在不同的时间范围内都是 1950 年后受炸弹影响的年代。在对早全新世至晚全新世溪流阶地沉积中的 Ah 和较低断面土壤层的基底进行年代测定时,也发现了原子弹的影响。使用传统方法和 AMS 方法对全新世晚期河道沉积中的原子弹污染进行比较,发现受原子弹影响的河床与已测定年代的河床并存,后者得出的年代标准偏差很小。胭脂河集水区主要冰川地段上的冲积层虽然很少见,但却发现了一个 Ahbk 地层的括号式 AMS 年龄,相对于以前获得的常规 14C 年龄,它改进了风化时间。受炸弹影响的沉积物似乎不同程度地分布在洪泛平原土壤和冲积地段的地面土壤中。大量流失的沉积物的 AMS 14C 年龄分布在过去几个世纪中,似乎与小冰河时期(LIA)的气候变化有关,花粉记录也证实了这一点。此外,这些经 AMS-14C 测定年代的岩床还校准了前半个千年风化时间中次生铁-铝氧化物的风化情况。
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来源期刊
Radiocarbon
Radiocarbon 地学-地球化学与地球物理
CiteScore
16.20
自引率
6.00%
发文量
85
审稿时长
6-12 weeks
期刊介绍: Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.
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