COMPREHENSIVE UPDATE OF MARINE RESERVOIR VALUES FOR NEW ZEALAND COASTAL WATERS TO INFORM COASTAL HAZARD RESEARCH

IF 2 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Radiocarbon Pub Date : 2024-01-17 DOI:10.1017/rdc.2023.120
Kate J Clark, Jocelyn C Turnbull, Bruce A Marshall, Taylor W A Ferrick, Jamie D Howarth
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Abstract

Marine radiocarbon (14C) ages are an important geochronology tool for the understanding of past earthquakes and tsunamis that have impacted the coastline of New Zealand. To advance this field of research, we need an improved understanding of the radiocarbon marine reservoir correction for coastal waters of New Zealand. Here we report 170 new ΔR20 (1900–1950) measurements from around New Zealand made on pre-1950 marine shells and mollusks killed by the 1931 Napier earthquake. The influence of feeding method, living depth and environmental preference on ΔR is evaluated and we find no influence from these factors except for samples living at or around the high tide mark on rocky open coastlines, which tend to have anomalously low ΔR values. We examine how ΔR varies spatially around the New Zealand coastline and identify continuous stretches of coastline with statistically similar ΔR values. We recommend subdividing the New Zealand coast into four regions with different marine reservoir corrections: A: south and western South Island, ΔR20 –113 ± 33 yr, B: Cook Strait and western North Island, ΔR20 –171 ± 29 yr, C: northeastern North Island, ΔR20 –143 ± 18 yr, D: eastern North Island and eastern South Island, ΔR20 –70 ± 39 yr.

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全面更新新西兰沿海水域海洋储量值,为沿海灾害研究提供信息
海洋放射性碳(14C)年龄是了解过去影响新西兰海岸线的地震和海啸的重要地质年代工具。为了推进这一领域的研究,我们需要进一步了解新西兰沿海水域的放射性碳海洋储层校正。在此,我们报告了 170 项新的ΔR20(1900-1950 年)测量值,这些测量值来自新西兰周边地区,是对 1950 年前在 1931 年纳皮尔地震中丧生的海洋贝壳和软体动物进行的测量。我们评估了觅食方式、生活深度和环境偏好对 ΔR 的影响,发现除了生活在开阔的岩石海岸线高潮位或高潮位附近的样本外,这些因素对 ΔR 的影响不大,因为这些样本的 ΔR 值往往异常低。我们研究了 ΔR 在新西兰海岸线周围的空间变化情况,并确定了在统计上具有相似 ΔR 值的连续海岸线。我们建议将新西兰海岸细分为四个区域,采用不同的海洋储层校正方法:A:南岛南部和西部,ΔR20 -113 ± 33 年;B:库克海峡和北岛西部,ΔR20 -171 ± 29 年;C:北岛东北部,ΔR20 -143 ± 18 年;D:北岛东部和南岛东部,ΔR20 -70 ± 39 年。
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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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