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在阿尔卑斯型超镁铁岩体边缘,分布有含碳酸盐超镁铁岩,即V·Lobochnikov等称的滑石菱镁片岩(Iistwaerite),其中可以见到汞、砷、钻—镍砷化物等各种矿化。此外,还已知产有一些金矿,但金与滑石菱镁片岩及超镁铁质围岩的成因关系仍存在疑问。为此,我们对上元古界(摩洛哥、沙特阿拉伯)和阿尔卑斯(利古里亚)蛇绿岩杂岩的含金滑石菱镁片岩进行了研究。 滑石菱镁片岩中金的分布是随机的,在上述三研究区,大多数样品的金含量相似,即0.02—1ppm,为伴生的超镁铁岩含金量(5—100ppb)之10—100倍。看来,滑石菱镁片岩是含金很富的一种岩类。滑石菱镁片岩的最高含金量为1—10ppm(达边界品位),与富黄铁矿带有关,尤其与砷化钴矿化有关(如摩洛哥的布阿泽尔地区),也与含副矿物黄铁矿或毒砂的晚期石英脉(含金0.2—10ppm)有关。实际上,从单矿物分析表明,滑石菱镁片岩中的主要含金矿物是黄铁矿(含金10—50ppm)和砷化钴(含金10—100ppm)。在上述矿物中
On the edge of Alpine-type ultramafic intrusions, carbonate-bearing ultramafic rocks, known as V · Lobochnikov et al., Are distinguished by the presence of Iistwaerite, of which mercury, arsenic, cobalt-nickel arsenide, Various mineralization. In addition, some gold mines are known to be produced, but the genetic relationship between gold and talc magnesite schists and ultramafic rocks is still in doubt. To this end, we have studied gold-bearing talus magnesite schist in the Upper Proterozoic (Morocco, Saudi Arabia) and Alpine (Liguria) ophiolite complexes. The distribution of gold in the talc magnesite schist is random. In most of the three studied areas, the gold content is similar, ie, 0.02-1 ppm, which is 10-100 times that of the associated ultramafic gold (5-100 ppb). It appears that talus Magnesite Slate is a rock rich in gold. The highest gold content of talc magnesite schist is 1-10ppm (up to the boundary grade), which is related to the pyrite belt, especially related to cobalt arsenide mineralization (such as the Bouazir area in Morocco) Iron ore or arsenopyrite late quartz vein (gold 0.2-10ppm) related. In fact, from the single mineral analysis shows that the main gold-bearing minerals in the talc magnesite schist is pyrite (gold 10-50ppm) and cobalt arsenide (gold 10-100ppm). In the above minerals