Research of Characteristics on Laser Raman and Infrared Spectra of Diamonds in Dajingtou Lamproite, West of Tan-Lu Fault
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摘要: 大井头岩体为郯庐断裂带西侧首个发现的含金刚石钾镁煌斑岩。笔者对其中的金刚石进行了激光拉曼和傅里叶可变红外光谱研究。其激光拉曼和红外光谱特征研究表明，测试的6颗金刚石可分为1a型和Ⅰb型2类，部分Ⅰb型金刚石叠加有Ⅰa型金刚石所特有的1 175 cm-1或1 182 cm-1吸收谱峰。根据测试金刚石的外貌特征和Ⅰb型初生金刚石向1a型金刚石转换的机制，认为大井头钾镁煌斑岩中的金刚石并非岩浆结晶成因，而是金刚石于地幔中率先形成，其后被超深源岩浆携带至地表，应属地幔捕掳晶成因。结合大井头地区优越的构造地质条件、金刚石重砂矿物异常及多处钾质超基性岩、火山角砾岩体的出露，认为该地区有望成为鲁西地区第四金刚石原生矿带。Abstract: Dajingtou pluton is the first diamondiferous lamproite discovered in the west of Tan-Lu fault zone. This paper studies the laser Raman and Fourier transform infrared spectra(FTIR) of the diamonds.The laser Raman and infrared spectrum data shows that the six diamonds from the Dajingtou lamproite can be distinguished into type Ia and type Ib. Some of the type Ib diamonds are superimposed on the type 1a with 1175 cm-1 or 1182 cm-1 absorption spectrum,which are unique to type Ia diamonds. According to the appearance features of the six tested diamonds and the conversion mechanism of type Ib to Type Ia, it is considered that diamonds in Dajingtou lamproite are not the cause of magma crystallization, but the mantle-derived xenocrysts, which were first formed in the mantle and then carried to the surface by ultra-deep magma. Taking into consideration of the excellent geological tectonic conditions, the abnormal heavy sand minerals in the diamonds, and the exposure of ultrabasic rocks and volcanic breccia, it is believed that this area is expected to be the fourth primary diamond belt in western Shandong.
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Key words:
- diamond /
- laser Raman /
- infrared spectra /
- lamproite /
- Pingyi area of Shandong province
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