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(一) 赋存於前震旦紀地层中的條帶狀含铁石英岩礦床,以其本身極其豐碩的礦石储量而成為铁礦床中最重要的一種工业類型,這種礦床的產地,不論是在我国或者在世界上的其他國家中,大多都形成鋼铁工業的中心。 這種礦床在礦床学中一般把它归之於受變質礦床,而在我國,由於這種礦床最早發现於鞍山地區,所以一般通稱它為鞍山式铁礦。 對於鞍山本溪地區的鞍山式铁礦,在本世纪的初期就開始研究了。先后在這裡作過地質工作的中、外地质學者很多,他們對於這种铁礦成因问题的看法是不相同的,有的認為是水成沉積后又经受區域變质而成的,有人主张是熱液交代成因的,有的人认為這種礦床可能不是一種成因的。下面概略地引述一下各種不同的意見。 1.主張水成變質成因的人認为,礦床是在前震旦紀時期在海水中沉积的一种铁质岩石,以後又經受區域變質作用而成的。對於礦床形成的具體過程和成礦物质來源,不同的學
(I) The banded ferrous quartzite deposits hosted in the Pre-Sinian strata have become the most important type of iron ore deposit with its own extremely rich ore reserves. The origin of such deposits, whether at Most of our country or other countries in the world form the center of the steel industry. This kind of deposit generally belongs to the metamorphic deposit in ore depositology. In our country, this deposit is generally called Anshan type iron ore because it was first discovered in Anshan area. The Anshan-type iron ore in Benxi area in Anshan began to be studied in the early part of this century. There have been many geological and geologists in the geological work here and there. Their opinions on the origin of this iron ore are not the same. Some people think that after the sedimentation of water, they have met the metamorphism of the area, and some people hold the view that Hydrothermal account of genetic causes, some people think that this deposit may not be a cause. The following is a brief summary of different opinions. 1. Advocates of the genesis of metamorphism suggest that the deposit was an iron-bearing rock that had been deposited in seawater during the Pre-Sinian period and was later subjected to regional metamorphism. For the formation of a specific process of mineralization and ore sources, different learning