Chronology of Lake Bonneville, 30,000 to 10,000 yr BP
Chronology of Lake Bonneville, 30,000 to 10,000 yr BP
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DOI：
10.1016/j.quascirev.2014.12.016
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发表时间：
2015-02-15
影响因子：
4
通讯作者：
Oviatt, Charles G.
中科院分区：
文献类型：
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作者：
Oviatt, Charles G.
本文收集了368个从邦纳维尔湖盆地的露头和海岸线采集的30 - 10 cal ka的放射性碳年龄。样品包括1.来自湖外来源的有机材料，如木材、木炭、来自紧急水生物的植物碎片和分散的湿地有机物，以及2.沉积在湖中的碳酸盐物质，如软体动物壳、凝灰岩、轮藻碎屑、鲕粒和泥灰岩。一般来说，有机物质提供的不是湖相事件的精确年龄，但它们的解释没有碳酸盐岩样品结果的解释复杂。数据集显示了不同碳酸盐样品被较新碳和较老碳污染的证据。例如，一个放射性碳水库在某些地方的湖泊在中期海侵阶段占年龄的软体动物壳是老比基木年龄在相同的海拔高度。大量的年龄允许一个准确的重建湖泊年表，年龄之间的冲突可以检测和可靠的年龄可以有意义地整合在解释。如果可以得到的年代更少，年表可能看起来更简单，但其准确性将是未知的。(C)2014爱思唯尔有限公司版权所有。
368 radiocarbon ages between 30 and 10 cal ka for samples collected from outcrops and shorelines from the Lake Bonneville basin have been compiled for this paper. Samples include 1. organic materials from sources outside the lake, such as wood, charcoal, plant fragments from emergent aquatics, and dispersed wetland organics, and 2. carbonate materials deposited in the lake, such as mollusk shells, tufa, charophyte debris, ooids, and marl. In general, organic materials provide rather than precise ages for lacustrine events, but their interpretation is less complicated than interpretation of results from carbonate samples. The data set shows evidence of contamination of different carbonate samples with both younger carbon and older carbon. For example, a radiocarbon reservoir at certain places within the lake during the middle transgressive phase accounts for ages of mollusk shells that are older than basal wood ages at similar altitudes. The large number of ages permits an accurate reconstruction of the lake chronology; conflicts between ages can be detected and reliable ages can be meaningfully integrated in interpretations. If fewer ages were available, the chronology might look simpler, but its accuracy would be unknown. (C) 2014 Elsevier Ltd. All rights reserved.