紫色“山仔濑石”的颜色成因及成矿机制研究
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P619.28+1;P574

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国家自然科学基金(42072252); 中国地质大学(武汉)珠宝检测创新中心开放基金(CIGTWZ-2022022)


Research on the metallogenic process and color origin of purple “Shanzilai stone”
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    摘要:

    紫色"山仔濑石"为寿山石的一种,是一种由层状硅酸盐矿物组成的黏土质玉石。其表层风化为黄色,内部为紫色,属于图章石中较为稀少的颜色品种。本文采用常规的宝石显微镜对其外观特征进行详细观察;利用X射线粉晶衍射仪、显微激光拉曼光谱仪、扫描电子显微镜、激光剥蚀等离子质谱仪等对其矿物组成、化学成分、稀土元素特征及谱学特征进行测试;利用全岩化学分析、紫外-可见光分光光度计、SPSS分析模型对其颜色成因进行研究。结果发现紫色"山仔濑石"的主要矿物组成为伊利石,次要矿物为独居石、磷钡铝石、赤铁矿和重晶石;其稀土元素指示性数据呈现出轻稀土元素富集,重稀土元素亏损的现象,指示其矿物成因与还原的酸性热液蚀变有关;紫色"山仔濑石"的紫色色调深浅与伊利石中Mn含量高低呈现正相关性;紫色"山仔濑石"内主要矿物和次要矿物的种类、分布特征和形成温度的不同说明在成矿后期存在多期热液侵入,紫色"山仔濑石"的形成过程与寿山地区的成矿规律具有一致性。

    Abstract:

    Purple "Shanzilai stone", a kind of Shoushan stone, is a layered silicate mineral clay jade. Its surface weathering for yellow, interior purple, corresponds to the seal stone in the rather unusual color variants. A standard gemstone microscope was used to examine the visual attributes. X-ray powder crystal diffractometer, microscopic laser Raman spectrometer, scanning electron microscope, and laser denudation plasma mass spectrometer were used to investigate the mineral composition, chemical composition, and rare earth elements (REE). The cause of the color was investigated using whole-rock chemical analysis, UV-visible spectrophotometer, and SPSS analytical model. According to the findings, the principal mineral composition of the purple "Shanzilai stone" is illite, with minor minerals including monazite, gorceixite, hematite and barite. The REE indicator data demonstrate an enrich of LREE components and a deficiency of HREE, indicating that the minerals' origin is associated to less acidic hydrothermal alteration. Illite’s purple hues and manganese concentration have a favorable association. The different types, distribution characteristics, and formation temperatures of the main minerals and secondary minerals in purple "Shanzilai stone" indicate that hydrothermal intrusion occurred several times during the late mineralization period, and the purple "Shanzilai stone" formation process is consistent with the metallogenic law in the Shoushan area.

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武嘉欣,陈涛,郑金宇,庄玥,田静琳,黄赵颖,2023,紫色“山仔濑石”的颜色成因及成矿机制研究[J].岩石矿物学杂志,42(2):263~274. WU Jia-xin, CHEN Tao, ZHENG Jin-yu, ZHUANG Yue, TIAN Jing-lin, HUANG Zhao-ying,2023,Research on the metallogenic process and color origin of purple “Shanzilai stone”[J]. Acta Petrologica et Mineralogica,42(2):263~274.

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  • 收稿日期:2022-11-01
  • 最后修改日期:2023-01-30
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  • 在线发布日期: 2023-03-22
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