Is there a reliable taphonomic clock in the temperate North Atlantic? An example from a North Sea population of the mollusc Arctica islandica
Is there a reliable taphonomic clock in the temperate North Atlantic? An example from a North Sea population of the mollusc Arctica islandica
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北大西洋温带地区是否有可靠的埋藏钟？
DOI：
10.1016/j.palaeo.2020.109975
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Butler P
中科院分区：
文献类型：
--
作者：
Butler P
对采自北海北方Fladen Ground的277个长寿双壳类软体动物Arctica islandica的贝壳进行了放射性碳年代测定和埋藏条件评估，以确定埋藏条件是否可以提供动物死亡时间的可靠指示。从整个弗拉登地面采样的9个站点，14 C年龄的一些强烈的地理偏差是明显的，与生活和现代（后炸弹脉冲）的材料发现在弗拉登地面的北方部分，而更古老的材料（上个千年的前半期和全新世早期/晚冰期）集中在中部和西部的网站。弗拉登地面南部和东部的样本稀少，主要是上个千年后半期的物质。这种南北分布被解释为北海千年时间尺度上环境变化的结果，导致生活环境逐渐向北转移。据认为，这与死后向南部和东部运送炮弹无关。使用五个特征（剩余角质层的量、韧带的存在和状况、壳边缘的侵蚀程度、生物侵蚀的量和内壳层的状况）的判别分析和主成分分析来评估埋藏条件，似乎是自动物死亡以来的时间的一般不可靠的指标。根据这5个埋藏学特征，判别分析将81.1%的爆炸后贝壳、39.6%的0-500年BP贝壳、68.0%的500-1000年BP贝壳和20.0%的早全新世/晚冰期贝壳归入正确的放射性碳年龄组。没有提供任何支持的想法，这种方法可以用来分类贝壳的年代建设作为一种替代放射性测年。
Two hundred and seventy-seven shells of the long-lived bivalve molluscArctica islandica, collected from the Fladen Ground, northern North Sea, were radiocarbon dated and their taphonomic condition assessed, in order to determine whether taphonomic condition might provide a reliable indication of time since the death of the animal. With nine stations from across the Fladen Ground sampled, some strong geographic biases in14C ages were apparent, with living and modern (post-bomb pulse) material found in the northern part of the Fladen Ground while older material (first half of the last millennium and Early Holocene/Lateglacial) was concentrated in the central and western sites. Samples from the south and east Fladen Ground were sparse and were dominated by material from the second half of the last millennium. This south-north distribution is interpreted as the result of environmental change over millennial time-scales in the North Sea causing a gradual northward shift of livingA. islandicapopulations and is not thought to be related topost mortemtransport of shells to the south and east. Taphonomic condition, assessed using discriminant analysis and principal component analysis of five characteristics (amount of remaining periostracum, presence and condition of the ligament, extent of erosion at the shell margin, amount of bioerosion, and condition of the inner shell layer), appeared to be a generally unreliable indicator of time since the death of the animal. Based on these five taphonomic characteristics, discriminant analysis placed 81.1% of post-bomb shells, 39.6% of shells from the period 0–500 yr BP, 68.0% of shells from the period 500–1000 yr BP and 20.0% of shells from the Early Holocene/Lateglacial group into the correct radiocarbon age grouping, providing no support for the idea that this method can be used to triage shells for chronology construction as an alternative to radiometric dating.
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
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DOI：
--
发表时间：
2013
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