The Itaparica technocomplex encompasses most of the lithic productions in Central Brazil from the Pleistocene-Holocene transition and early Holocene. It is characterized by industries based on a techno-functional complementarity between tools made from unifacially shaped blanks and retouched flakes. The unifacially shaped artefacts, designated by different names in the literature (for example, limaces, plano-convex tools, unifaces), are historically the most emblematic remains of this technocomplex. Techno-functional analyses of these artefacts demonstrate that they did not correspond to a single tool, but rather to a blank for different simultaneous or successive tools. Many indicators also suggest that these blanks had a long useful live and passed through different technical phases. We present here a study of the chaines operatoires related to the reconfiguration of the unifacially shaped artefacts of the Itaparica technocomplex during their use-life. To do so, we use the collection recovered during the excavation of the GO-JA-01 rockshelter, in Serranopolis (Goias state), central Brazil. This important corpus of 377 pieces allows for a good perception of their technical variability. It comes from layers dated between 12,500 and 10,000 calibrated years BP.Different stages of modification of the unifacially shaped artefacts can be observed. Resharpening is limited to restoring the functionality of an active part. It affects the sides as well as both extremities of the blank. It is common, also, to find these artefacts as fragments, due to transversal fractures. It is not always easy to determine if the fragments are the result of an accident during the use of the artefact or of a deliberate act of reconfiguration. Nonetheless, in various instances, cases of removal scars posterior to the fracture demonstrate that fragmentation was taken into account in the reconfiguration schemes of the unifacially shaped artefacts.Strictly speaking, reconfigurations concern more important modifications than resharpening, affecting the artefact’s volume and not only its periphery. They correspond to new steps of shaping, either partial or complete. Reconfigurations can be seen at the GO-JA-01 site thanks to detailed analyses to the diacritical schemes of production and by visible differences in artefact surfaces (e.g., double patinas). These modifications can follow one another until the blank is exhausted. In such cases, the artefact no longer possesses operational transformative parts.By studying the indicators of modification throughout the use-life of the unifacially shaped artefacts from GO-JA-01, one can define two different reconfiguration schemes. In the predominant one, modifications touch mainly the distal and proximal ends, thus reducing the artefacts length. In a secondary scheme, on the contrary, width decreases due to reconfigurations in the sides. Those two schemes can also be found in the collection of artefacts from Lapa do Boquete site (Minas Gerais state).Reconfigurations can have a significant impact on blank volume and form, but they cannot explain all the variability of these artefacts. It appears that there exists a consistency in the structure of the blanks over time and this calls for the existence of a diversity of intentions from the start of the production of the unifacially shaped artefacts of the Itaparica technocomplex.

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意大利国际展览中心：意大利Itaparica理工学院单一建筑管理委员会

Itaparica技术复合体涵盖了更新世-全新世过渡和全新世早期巴西中部的大部分石器生产。它的特点是基于单面毛坯和修饰薄片制成的工具之间具有技术功能互补性的行业。从历史上讲，单面形状的人工制品在名称上有不同的名称（例如，糖浆，平凸工具，单面），是这种技术复杂性中最具代表性的遗迹。对这些伪像的技术功能分析表明，它们并不对应于单个工具，而是对应于不同的同时或相继工具的空白。许多指标还表明，这些空白的使用寿命很长，并且经历了不同的技术阶段。我们在此介绍有关链条操作的研究，这些链条与Itaparica技术复合体的单面形状人工制品在其使用寿命期间的重新配置有关。为此，我们使用在巴西中部塞拉诺波利斯（戈亚斯州）的GO-JA-01凿岩机开挖过程中回收的收集物。377个重要语料库可以很好地理解其技术变异性。它来自BP校准年在12,500到10,000年之间的层，可以观察到不同形状的人工制品的修饰阶段。重磨仅限于恢复活动部件的功能。它会影响毛坯的侧面和两端。由于横向断裂，通常将这些伪像作为碎片发现。确定碎片是否是在使用人工制品过程中发生的事故还是故意的重新配置行为并不总是那么容易。但是，在各种情况下，骨折后去除疤痕的情况表明，在单面形假体的重塑方案中考虑了碎裂的问题。严格来说，重整涉及比重磨更重要的修改，不仅影响其体积，而且不仅影响其体积周边。它们对应于部分或完全成型的新成型步骤。可以在GO-JA-01现场看到重新配置，这要归功于对变音处理方案的详细分析以及人工制品表面（例如双铜锈）的明显差异。这些修改可以相互遵循，直到坯料用尽。在这种情况下，人工制品不再具有可操作的转化部分。通过研究GO-JA-01的单面人工制品在整个使用寿命中的修饰指标，可以定义两种不同的重新配置方案。在主要的方面，修饰主要接触远端和近端，从而减少了伪像的长度。相反，在第二方案中，宽度由于侧面的重新配置而减小。这两个方案也可以在Lapa do Boquete站点（米纳斯吉拉斯州）的人工制品集合中找到。重新配置可能会对毛坯的体积和形式产生重大影响，但无法解释这些人工制品的所有可变性。