川滇黔地区铅锌矿床中锗的富集规律研究

利用电感耦合等离子质谱仪（ICP-MS）分析了川滇黔地区7个铅锌矿床（大梁子、天宝山、会泽、富乐、杉树林、青山、牛角塘）的49件闪锌矿和方铅矿单矿物样品中分散元素锗的含量,结果表明锗富集于闪锌矿中,方铅矿中不富集锗。对文献报道的锗富集于方铅矿中的结论和数据进行了分析,指出了这些结论所依据的电子探针分析数据不可信的可能原因：方铅矿中检测出锗可能是分析过程中电子束穿插了其他锗含量较高的矿物所致;闪锌矿中未检测出锗是由于锗的含量相对较低,小于电子探针仪器的检测限所致;本次分析的7个矿床的闪锌矿中锗的平均含量为0.0125%,而电子探针仪器的检测限为0.02%。

A Study on the Enrichment Regularity of Ispersed Elements Ge in Pb-Zn Deposits in Sichuan, Yunnan and Guizhou Provinces, China

Fourty-nine different sphalerite and galena samples from seven lead-zinc deposits(Daliangzi,Tianbaoshan,Huize,Fule,Shanshulin,Qingshan and Niujiaotang) in Sichuan,Yunnan and Guizhou Provinces were analyzed by using inductively coupled plasma mass spectrometer(ICP-MS) in this study.The analytical results indicate that sphalerite is characterized by enrichment of Ge and Cd,while galena has a very low content of Ge.But some prior literatures show that Ge is mainly enriched in galena.Through investigation of these literatures,a possible reason is proposed that the electron beam may pierce other minerals with a high contents of Ge during the analyzing process of galena by using electron microprobe.And the reason that sphalerite has a very low content of Ge reported by literatures is that the content is lower than the detection limit of electron microprobe.The average content of Ge in sphalerite in the seven lead-zinc deposits is 0.0125%,but the detection limit of electron microprobe is 0.02%.