Optical dating of dune sand from Blombos Cave, South Africa: I - multiple grain data
Optical dating of dune sand from Blombos Cave, South Africa: I - multiple grain data
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DOI：
10.1016/s0047-2484(03)00048-4
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发表时间：
2003-05-01
影响因子：
3.2
通讯作者：
Duller, GAT
中科院分区：
文献类型：
--
作者：
Jacobs, Z;Wintle, AG;Duller, GAT
风成沙单位覆盖在中石器时代的沉积物在布隆伯斯洞穴南部开普海岸。这些沉积物包含了重要的文化文物，包括骨制工具和赭石雕刻，以及大量的石制品。风成沙和其他两个沙丘的残余物形成对沿海悬崖使用光学测年。为了确定沉积后接受的剂量，使用单等分再生剂量（SAR）方案对5 mg等份纯化石英颗粒进行测量。报告了几个内部检查程序的结果，并提供了每份样品至少15次重复剂量测定。将这些剂量值与每个样品的放射性含量测量值相结合，得出洞穴内单元的年龄为69.2 +/- 3.9 ka，所有三个沙丘样品的平均年龄为70.1 +/- 1.9 ka。这为布隆伯斯洞穴中的中石器时代物质提供了最低年龄。(C)2003爱思唯尔科技有限公司版权所有。
An aeolian sand unit overlies the Middle Stone Age deposits at Blombos Cave on the southern Cape coast. These deposits contained culturally-important artefacts, including bone tools and pieces of engraved ochre, as well as a large number of worked lithics. The aeolian sand and two other remnants of the sand dune formed against the coastal cliff were dated using optical dating. To determine the dose received since deposition, measurements were made on 5 mg aliquots of purified quartz grains using the single-aliquot regenerative-dose (SAR) protocol. The results of several internal check procedures are reported and at least 15 replicate dose determinations are presented for each sample. Combining these dose values with measurements of the radioactive content of each sample resulted in an age of 69.2 +/- 3.9 ka for the unit within the cave, and a mean age of 70.1 +/- 1.9 ka for all three dune samples. This provides a minimum age for the Middle Stone Age material at Blombos Cave. (C) 2003 Elsevier Science Ltd. All rights reserved.