Quantifying lithic microwear with load variation on experimental basalt flakes using LSCM and area-scale fractal complexity (Asfc)
Quantifying lithic microwear with load variation on experimental basalt flakes using LSCM and area-scale fractal complexity (Asfc)
复制标题
使用 LSCM 和面积尺度分形复杂度 (Asfc) 量化实验玄武岩片上负载变化的岩屑微磨损
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Alastair J. M. Key
中科院分区：
文献类型：
--
作者：
W. Stemp;M. Morozov;Alastair J. M. Key
工作载荷是影响石材工具磨损的因素之一。尽管认识到工作载荷和石材工具微磨损发展之间的关系的重要性，但很少有人尝试量化由于载荷变化引起的磨损差异。在一个对照实验中，我们使用了30块从非洲坦桑尼亚奥杜威峡谷收集的原材料中破碎的玄武岩薄片，以相同的行程数切割橡树树枝。对于每个薄片，施加不同的负载水平，从150 g开始，以150 g的增量增加到4.5 kg的最大负载。使用激光扫描共聚焦显微镜以数学方式记录薄片的表面纹理。磨损表面的数据进行了比较，使用面积尺度分形复杂性（Asfc），从相对面积计算，以确定在何种程度上负载的变化显着影响的磨损量的鳞片表面。我们的研究结果表明，工作负荷确实发挥了作用，在这些薄片上的石微磨损的发展和歧视的两个磨损的薄片表面，使用均方比的Asfc，可变负载的基础上始终是可能的，负载差异在100克和4.5公斤之间。然而，薄片表面上的微磨损的歧视是不一致的所有负载水平的差异和歧视变得不太一致时，工作负载差异低于100 g。
Working load is one factor that affects wear on stone tools. Despite the recognition of the importance of the relationship between working load and the development of microwear on stone tools, there have been few attempts to quantify differences in wear due to changes in load. In a controlled experiment, we used 30 basalt flakes knapped from raw material collected in Olduvai Gorge, Tanzania, Africa, to cut oak branches for the same number of strokes. For each flake, a different loading level was applied starting at 150 g and increasing by increments of 150 g to a maximum load of 4.5 kg. A laser scanning confocal microscope was used to mathematically document the surface texture of the flakes. The worn surface data were compared using area-scale fractal complexity (Asfc), calculated from relative areas, to determine the degree to which variation in loading significantly affected the amount of wear on the flake surfaces. Our results indicate that working load does play a role in the development of lithic microwear on these flakes and that discrimination of two worn flake surfaces, using mean square ratios of Asfc, based on variable load is consistently possible with load differences between ∼100 g and 4.5 kg. However, discrimination of microwear on flake surfaces was not consistent for all load level differences and discrimination became less consistent when working load differences were below ∼100 g.