| 关于层控式矽卡岩型矿床——以安徽省内下扬子坳陷中一些矿床为例 |
| 点此下载全文 |
| 引用本文：.1983.On strate-bound skarn deposits[J].Mineral Deposits,2(1):11~20 |
| Hits: 3533 |
| Download times: 2606 |
|
| |
| On strate-bound skarn deposits |
|
|
| Abstract:The skarn deposits, a type rather developed in the Eastern China metallogenic megaprovince, distinguish themselves in economic geology of China for their diverse patterns of occurrence, a great variety of ore species and abundant ore reserves. According to ore-controlling factors and modes of occurrencet they can be subdivided into five subtypes: (l) contact; (2) strata-bound; (3) breccia pipe; (4) fissure-filling and (5) compound (mainly a sort of compounding between subtype land. Their genetic association and spatial distribution make it possible for us to advance a model for the formation of skarn deposits. The strata-bound skarn deposits discussed in this paper refer to stratiform or lenticular ore bodies which are concordent with or parallel to certain strato and occur within contact aureoles in close relation to skarnization. Ore materials of these deposits might have been derived from various sources, including possibly some sediments; at the same time, magmatic hydrothermal solutions must have still played a dominant part in ore formation. This subtype of deposits, therefore, has been assigned to skarn deposits to lay emphasis on the leading role played by the intrusive magma in the process of ore formation. In so doing, the description will be more objective and practical. Nevertheless, in the opinion of the authors, the definition of "skarn deposits" should be extended somewhat all the same to include certain concepts of source bed so that the conventional conceptions of syngenesis and epigenesis as well as of endogenesis and exogenesis could be broken through in some degree and a much deeper understanding of the nature of these deposits would be acquired. On the basis of main ore sources the strata-bound skarn deposits in turn could be further divided into three subdivisions with a great many transitional varieties in between. These three subdivisions are: (l) deposits formed predominantly by endogenic process; (2) those formed predominantly by superimposition; (3) those produced by transformation. Such classification enables the deposits under discussion to make up an independent group of their own. |
| View Full Text View/Add Comment Download reader |
|
|
|
