黄色系硅化造礁石珊瑚的结构特征及颜色成因研究
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P736.3

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Structural characteristics and color genesis of yellow silicified scleractinia
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    摘要:

    近些年,黄色系硅化造礁石珊瑚以其独特的花纹和美丽的颜色受到了人们的关注和喜爱。为充分认识硅化造礁石珊瑚的结构特征及颜色成因,本文采用X射线粉末衍射仪、偏光显微镜、热场发射扫描电子显微镜、紫外-可见光分光光度计和拉曼光谱仪对3块天然黄色系硅化造礁石珊瑚进行了研究。结果表明: 所研究的硅化造礁石珊瑚空腔区与隔片区石英颗粒的形态、种类及分布特征不同。当隔片和体壁所围成的空腔或是共骨之间的空腔足够大时,沿空腔内壁到中心,石英颗粒的种类和形态从不规则的细粒→他形的中粒→他形-半自形粗粒;当空腔受到挤压时,石英颗粒主要为他形或似纤维状的细粒石英。隔片区的石英颗粒主要为细粒石英。在偏光显微镜下观察到的黄色-褐红色的矿物经证实为针铁矿和赤铁矿,其中赤铁矿是黄色系硅化造礁石珊瑚的主要致色矿物。受造礁石珊瑚骨骼结构的影响,微观上针铁矿和赤铁矿总是以色素点的方式存在于极细粒或细粒石英颗粒的间隙,宏观上富集于隔片区和空腔边缘。

    Abstract:

    Yellow silicified scleractinia has gained popularity in the market due to its unique pattern and beautiful color. To comprehend the structural characteristics and color origin of silicified scleractinia, three natural yellow silicified scleractinia were studied using X-ray powder diffractometry, polarising microscopy, thermal field emission scanning electron microscopy, UV-visible spectrophotometry, and Raman spectroscopy. There are differences in the morphology, species, and distribution of quartz particles in the space and the septa area of the scleractinia samples. The quartz particles will develop along the inner wall to the center, with irregular fine grain, xenomorphic medium grain, and xenomorphic semidiomorphic coarse grain when the space between the septa and the theca or the coenosteum is sufficiently large. The quartz particles are mainly xenomorphic or fibrous fine quartz when the cavity is compressed. In the septa area, the quartz particles are mainly fine quartz. The yellow and brownish-red minerals in silicified scleractinia observed under a polarizing microscope were confirmed to be goethite and hematite, respectively. Hematite is the main cause of the yellow color in silicified scleractinia. Due to the influence of coral bone structure, goethite and hematite always exist in the space of very fine or fine quartz particles in the microcosmic form of pigment points. They are enriched in the septa area and the margin of space.

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郭逸琳,郭颖, 2024. 黄色系硅化造礁石珊瑚的结构特征及颜色成因研究[J]. 岩石矿物学杂志, 43(3):663~672.
GUO Yi-lin, GUO Ying, 2024. Structural characteristics and color genesis of yellow silicified scleractinia[J]. Acta Petrologica et Mineralogica, 43(3): 663~672.

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  • 收稿日期:2024-01-25
  • 最后修改日期:2024-04-08
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  • 在线发布日期: 2024-05-23
  • 出版日期: 2024-05-25