冲积型砂金矿床成矿地质特点及找矿方向

THE GENERAL MINERLIZATION CHARACTERISTICS AND THE PROSPECTING ORIENTION OF ALLUVIAL GOLD DEPOSITS

本文扼要介绍了冲积型砂金矿床的一般特点,着重讨论了冲积型砂金矿成矿的控制因素,指出了有利的大地构造环境、区域构造条件和新构造运动,丰富的金源如原生金源层(体)、后生古砂金矿及各种含金风化壳,特别是红土型风化壳及有利的地貌条件,是冲积型砂金矿形成与赋存的必不可少的条件。最后,总结了冲积型砂金矿的一般富集规律,并指明了找矿方向。

The general characteristics of alluvial gold deposits, are briefly introduced in this paper while the ore—controlling factors are discussed emphatically. It is noted that the favourable tectonic environment, regional structure condition and neotectonism, significant gold source such as primary gold source bed(or body), secondary poleo—gold placer and all kinds of gold—bearing weathering crust, especially the Laterized crust and the favourable geomorphic condition, are essential conditions for the formation and preservation of the alluvial gold deposits. At the end of the paper, the general concentration regularity of alluvial gold deposits is summarized, and its prospecting oriention is also indicated.