关于矿源层和成矿物质来源的探讨

The query on the source bed and the sources of metallogenic materials

"矿源层"的基本概念是富含一种或几种成矿物质的地层或岩石。矿床中的成矿物质主要来源于矿源层,认为岩浆岩的侵位使其中的成矿物质被活化、迁移、沉淀成矿。"矿源层"成矿理论多年来一直被广大地质工作者接受和引用,在一些文献和论文中屡见不鲜。我们认为,富含成矿物质的地层或岩石是客观存在的,但从中萃取成矿物质成矿的机理是值得探讨的,即成矿物质被活化、迁移过程中,为什么从低温处向高温处迁移?为什么从低压区向较大压力区迁移?又为什么从低浓度区向高浓度区迁移?为什么被萃取的"矿源层"没有发生热液蚀变?本文举例说明冀东二十多亿年前生成的铁、金和铅锌矿在经历无数次热事件后,并未发生活化、迁移,生成新的矿体,仍保留原始面貌,证明从围岩(矿源层)萃取成矿物质、迁移富集成矿的机理是不可行的。指出成矿物质是岩浆从地壳深部带上来的,岩浆热液是成矿物质的主要来源。

The basic concept of the ＂source bed＂ is strata or rocks with plentiful metallogenic materials of one or more.The metallogenic materials of deposits come from source bed predominately;I think that the metallogenic materials in the magmatic rock are activated,removed and precipitated to form ore when the magmatic rock was emplacement.The mineral-forming theory of the ＂source bed＂has been accepted and quoted by the most geologists,it has been quoted in the geologic documents and papers.We think that the strata and rock with rich in merallogenic materials are facts.But the principle of extracting metallogenic materials from the ＂source bed＂need discussed further,that is,during the metallogenic materials activating and removing,why were metallogenic materials removed from low-temperature to high-temperature site？ Why were they removed from low-pressure to high-pressure site？ Why were they removed from low-concentration to high-concentration site？ And why did ＂source bed＂ that was extracted not occur hydrothermal alteration？ This paper gives an example illustration that Fe,Au and Pb,Zn deposits have undergone hydrothermal activities many times for over 2 000 million in eastern Hebei,they haven’t taken place activation,removal and enrichment to form new ore body.The primary feature still was preserved.It proved that it is impossible to extract metallogenic materials from wall-rock（source bed）,remove,accumulate and form new ore body.The author put forward that metallogenic materials come from magma in deep of the earth crust,magmatic hydrothermal solution is main source of metallogenic materials.