甘肃省北山地区中生代构造花岗岩侵入及成矿作用

本文探讨了甘肃北山地区中生代进入陆内演化以来的构造活动特征：不仅陆壳有明显的活化,而且受到了滨西太平洋构造域和阿尔金山构造的重大影响。列举了近期有关成矿和相关的花岗岩成岩的放射性同位素年龄资料。资料显示,印支期、燕山期成矿作用强烈而广泛,是该区的重要成矿期。本文初步研究了中生代以来成矿作用及其与花岗岩类岩石的时空关系。对该区的成矿作用及其分布规律,对本区某些重要矿床、矿点的成矿时代和空间分布进行了新的解释。目的是为在该区扩大找矿远景开拓新的思路。

MESOZOIC TECTONICS, GRANITE AND MINERALIZATIONIN BEISHAN AREA OF GANSU PROVINCE

Tectonic activities occurred during and after the period of Mesozoic intracontinental evolution in Beishan area of Gansu Province show the features as： the continental crust was not only activated but influenced by the tectonic domain of offshore west Pacific Ocean and A＇erjianshan tectonic. The recent age data of radioactive isotope concerning mineralization and granite diagenesis of granite reveal that mineralization occurred intensively and widely in the Indo-Chinese epoch and Yanshan epoch when is the important mineralization period. In this essay, the mineralization occurred after Mesozoic and space-time relation of granitoid are studied, and the mineralization and distribution regularities, some key deposits, mineralization epoch and spatial distribution of some mineral occurrences are provided interpretations different from the past.