内蒙平庄盆地煤系金的探索

本文是在断陷煤盆地中找金的探索性研究。平庄盆地煤系中各类煤、岩石的含金背景值均大于10×10~(-9),最高达28×10~(-9)。碱性还原介质有利于金的富集,金与黄铁矿共生,但金分布不均匀。基性岩浆热作用促使煤及粘土夹层中的微量金活化、迁移、再富集,含金量可提高到75×10~(-9)。局部见有载微量金的黄铁矿细脉。有机质在含金黄铁矿形成中起还原作用。成煤后,岩浆活动欠频繁,强度不大,金的预富集条件虽较好但未能成矿。

RESEARCH ON GOLD IN COAL FORMATION IN PINGZHUANG BASIN, INNER MONGOLIA

The authors summarize the explorative research on gold-finding in fault basin. and giveinitial knowledge of the gold contents in various coals and rocks. the gold occurrence and goldenrichment conditions in Pingzhuang basin. The background gold contents are all greater than10 ×10-9, with the maximum of 28 × 10-9. Alkali reduction media are beneficial to the concen-tration of gold. Gold associates with pyrite, but not well-distributed. Basin magmatic activitydeepens the coalification and makes the trace gold in coal and clay to be remobilized and recon-centrated. so the gold contents can rise to 75 × 10-9.Organic material act as reductants during the forming of gold-bearing pyrite. After coal-forming period, magmatic activity is not frequent enough and not intensive enough,so the goldin coal formation can't concentrate and form ore deposit.