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中新网南宁8月4日电(张广权)广西民族博物馆4日介绍,近期,山东大学环境与社会考古国际合作联合实验室与该馆等单位合作,在国际学术期刊《考古科学杂志》(Journal of Archaeological Science)发表题为《中国南方广西花山岩画的粘合剂是血诱导的生物矿化碳酸钙》的最新研究成果。研究利用前期收集到的天然脱落岩画碎块样本,揭秘左江花山岩画“驻颜”两千多年的原因。

论文第一作者兼通讯作者、山东大学考古学院(文化遗产研究院)副研究员吴朦介绍,本研究运用电子显微镜与能谱联用、傅里叶变换红外光谱、拉曼光谱、蛋白质组学等技术,对样本的结构和成分进行详细解析。研究发现,左江花山岩画是由“天然石灰岩基底——石灰/骨灰/血液灰浆——纳米氧化铁颜料”三层结构紧密结合的一个整体。这是一种极其稳定的有机—无机复合胶结体系,其抗物理、化学、生物侵蚀的能力远超天然有机胶结材料。
其基本原理是:首先,岩画创作者将石灰石和骨头一起煅烧,得到混合骨灰的生石灰,再将其与水、少量血液混合制成血液灰浆,并将灰浆涂刷在石灰岩表面。其次,将富含氧化铁的红黏土与水混合,提取天然纳米氧化铁作为绘制岩画的颜料。然后,在半干的灰浆表面用颜料作画。最后,灰浆中的氢氧化钙与空气中的二氧化碳反应生成碳酸钙,并在血液蛋白诱导下发生“生物矿化”,形成致密晶体。
论文共同作者广西民族博物馆研究馆员胡鹏程介绍,不少人认为左江花山岩画的绘制颜料由矿物颜料与有机胶结物(动物胶或植物胶)调和而成,而天然有机胶结材料难以在湿热多雨的自然环境中长期稳定保存。本次研究是在岩画材料和绘制工艺方面的一次突破。
论文通讯作者、山东大学教授王伟指出,一直以来,左江花山岩画色彩的稳定性令学者们困惑且着迷。本次研究为左江花山岩画制作工艺、胶结机制及相关技术演化研究提供新的科学依据,也为岩画保护研究提供新的思路。(完)
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