缅甸根珀基体与方解石的伴生状态研究  

Study on Hosting State between Calcite and Matrix in Root Amber from Myanmar

作　　者：闫冰 林丽姗 刘艺苗 吴婧 欧晓娅 YAN Bing;LIN Lishan;LIU Yimiao;WU Jing;OU Xiaoya(Gemmological Institute,China University of Geosciences,Wuhan 430074,China;Jibian Kaiwu Culture Co.,Ltd.,Baoshan 678000,China)

机构地区：[1]中国地质大学(武汉)珠宝学院,湖北武汉430074 [2]极边开物文化有限公司,云南保山678000

出　　处：《宝石和宝石学杂志(中英文)》2025年第1期13-20,共8页Journal of Gems & Gemmology

摘　　要：本研究聚焦缅甸根珀中普遍存在的白色脉状矿物的赋存状态及其与琥珀基体的相互关系。通过常规宝石学测试结合红外光谱分析,确定了根珀样品中黄色-棕褐色区域符合典型缅甸琥珀的产地特征;拉曼光谱显示根珀样品中白色脉状矿物为方解石,黑色颗粒状矿物为黄铁矿;光学显微镜和扫描电子显微镜详细表征了白色脉状方解石与琥珀基体的空间伴生状态,方解石呈现侵入式形态穿插于根珀基体内部结构,即大量微米级的方解石脉存在于根珀黄色-棕色基体中,它们之间的界限未见明显的成分过渡现象。值得注意的是,方解石脉与琥珀基体交界处存在大量破损碎块,这可能是导致根珀透明度较低的一个潜在因素。方解石作为一种稳定的碳源,与有机物琥珀和黄铁矿共存的现象揭示了该品种琥珀埋藏时期的古环境特征,这不仅有助于厘清根珀的形成过程,还能进一步反映古环境的变迁历史。This study aims to explore occurrence state of prevalent white vein-like minerals in root amber from Myanmar and their interrelationship with amber matrix.The results of the conventional gemmological tests and Fourier transform infrared spectroscopy(FTIR)confirmed that the yellow-brown matrix of the root amber samples exhibit the typical provenance characteristics of amber from Myanmar.Raman spectroscopic test results identified the white vein-like minerals as calcite and the black granular minerals as pyrite.Optical microscopic and scanning electron microscopic tests provide detailed characterization of the spatial coexistence of the white vein-like calcite and amber matrix.The calcite exhibits an intrusive morphology,interspersed within the internal structure of the root amber matrix,indicating the presence of numerous micron level calcite veins inside the yellow-brown matrix of amber.There is no compositional transition at boundaries between calcite veins and amber matrix.Additionally,the presence of large amounts of broken fragments are observed at the junction between the calcite veins and amber,which could be a potential factor contributing to low transparency of the root amber.The coexistence of calcite as a stable carbon source,with organic amber and pyrite insights into the paleoenvironmental conditions during burial period of root amber.This not only clarifies the formation process of root amber,but also further reflects the historical changes in paleoenvironment.

关 键 词：根珀 宝石学特征 伴生方解石 赋存状态 缅甸 

分 类 号：P572[天文地球—矿物学] Q91[天文地球—地质学] TS93[天文地球—古生物学与地层学]