摘要:
瓦房店金伯利岩热液蚀变强烈，原岩矿物组分几乎蚀变殆尽，显微镜下对蚀变矿物鉴定相当困难.利用X射线粉晶衍射技术对蚀变金伯利岩物相进行系统检测，结果显示：42号岩管金伯利岩主要矿物为蛇纹石、金云母和滑石，有少量方解石、锐钛矿、磷灰石、石英、钛铁矿、钙钛矿、榍石、磁铁矿和绿泥石；石灰窑1号无矿金伯利岩岩管主要矿物为蛇纹石、金云母和白云石，有少量方解石、锐钛矿、磷灰石、滑石、磁铁矿和绿泥石；9号无矿金伯利岩岩脉主要矿物为方解石和石英，有少量绿泥石和重晶石；51号贫矿金伯利岩岩管主要矿物为蛇纹石和金云母，方解石化作用不均匀，白云石化作用普遍，有少量锐钛矿、滑石、磁铁矿、绿泥石、磷灰石、钛铁矿、石英；30号贫矿岩管样品风化严重，主要矿物为蒙脱石，有少量方解石、滑石、蛇纹石、榍石、磷灰石.实践证明，采用X射线粉晶衍射仪鉴定金伯利岩蚀变矿物组合是一种非常可行的技术手段.
Abstract:
Due to the strong hydrothermal alteration, the original minerals of the kimberlite in Wafangdian, Liaoning Province have been altered completely. It is quite difficult to identify such altered minerals under a microscope. To detect the mineral phases of the kimberlite, the X-ray powder diffraction technology is adopted. The result shows that, the major minerals of No. 42 kimberlite pipe are serpentine, phlogopite and talc, with minor calcite, anatase, apatite, quartz, ilmenite, perovskite, sphene, magnetite and chlorite. The No. 1 barren kimberlite at Shihuiyao is dominated by serpentine, phlogopite and dolomite, with a little calcite, anatase, apatite, talc, magnetite and chlorite. The No. 9 barren kimberlite dyke is composed of mainly calcite and quartz, with some chlorite and barite. The No. 51 kimberlite pipe consists of mainly serpentine and phlogopite, with uneven calcitization and common dolomitization, also with some anatase, talc, magnetite, chlorite, apatite, ilmenite and quartz. The No. 30 poor ore sample is seriously weathered, with main mineral of montmorillonite and minor calcite, talc, serpentine, sphene and apatite. The practice proves that this method is a feasible technology for the identification of the altered mineral assemblage of kimberlite.
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