LA-ICP-MS analysis of Clovis period projectile points from the Gault Site
LA-ICP-MS analysis of Clovis period projectile points from the Gault Site
复制标题
DOI：
10.1016/j.jas.2014.08.014
复制
发表时间：
2014-12
影响因子：
2.8
通讯作者：
Charles A. Speer
中科院分区：
文献类型：
--
作者：
Charles A. Speer
克洛维斯时期狩猎采集者流动的一个关键原则是利用大范围的外来原材料，特别是燧石，在克洛维斯组合的外观。在克洛维斯时期组合中鉴定燧石的来源是有问题的，因为它依赖于宏观特性。燧石的宏观特性在一个露头中变化很大，分布在很大的区域，并且在不相关和遥远的背景中具有相关性。利用仪器地球化学的方法，可能提供的能力，联系燧石文物的来源的进步。采用激光烧蚀-电感耦合等离子体质谱法（LA-ICP-MS）从高尔特遗址（41 BL 323）的33个克洛维斯时期抛射物点中回收微量元素数据。这个数据进行了比较，从224个主要的地质样品的燧石从多个主要来源在得克萨斯州爱德华兹高原的微量元素数据。使用典型判别分析将克洛维斯点与地质源进行比较，以在三个空间尺度上建立组成员关系：宏观区域（大于500 km）、区域（30 - 500 km）和局部（1 - 30 km）。在宏观区域尺度上发现，33个克洛维斯点中有21个点的地球化学性质与爱德华兹高原源相似。在区域范围内，21个已确定的爱德华兹高原克洛维斯点中有15个可归因于一个特定的来源。最后，只有两个克洛维斯点可以被确定为局部尺度的特定来源。
A key tenet of Clovis period hunter–gatherer mobility is the utilization of large ranges based on the appearance of exotic raw materials, particularly chert, in Clovis assemblages. The identification of the sources of chert in Clovis period assemblages is problematic as it has relied on macroscopic properties.Macroscopic characteristics of chert can be highly variable in a single outcrop, occur across very large areas, and have correlates in unrelated and far removed contexts. An instrumental geochemical approach was utilized that potentially offers advances in the capacity to link chert artifacts to their sources. Trace element data was recovered from 33 Clovis period projectile points from the Gault Site (41BL323) using Laser Ablation-Inductively Coupled Plasma-Mass Spectrometry (LA-ICP-MS). This data was compared to trace element data recovered from 224 primary geologic samples of chert from multiple primary sources across the Edwards Plateau in Texas. The Clovis points were compared to the geologic sources using canonical discriminant analysis to establish group membership at three spatial scales: macro-regional (greater than 500 km), regional (between 30 and 500 km), and local (between 1 and 30 km). It was found at the macro-regional scale that 21 of the 33 Clovis points were to be geochemically similar to Edwards Plateau sources. At the regional scale, 15 of the 21 identified Edwards Plateau Clovis points could be attributed to a particular source. Lastly, only two Clovis points could be identified to particular sources at the local scale.