河北张家口金矿石英的标型特征及其成因意义

本文详尽地研究了张家口金矿两种主要含矿石英（乳白色石英和烟灰色石英）的气液包裹体特征、显微变形特征、成分标型特征、气液包裹体成分特征及晶胞参数标型特征，对比了两种石英含金性的差异与上述各类特征间的关系，并将该矿床的石英标型特征与国内外一些典型矿床的石英标型特征进行了对比，在此基础上得出：烟灰色石英与乳白色石英具有不同的气液包裹体特征、显微变形特征和微量元素特征，张家口金矿的成矿溶液为一种具低中等盐度、弱碱性、Ｎａ￣（＋）－Ｃａ￣（２＋）－Ｃｌ￣（－）型及Ｎａ￣（＋）－Ｃａ￣（２＋）－ＳＯ型、中深成、中高温热水溶液。结合矿床产出的地质背景，文章最后得出：张家口金矿为中高温、中深成变质热液型金矿床。

Typomorphic Characteristics of Quartz from the Zhangjiakou Gold Deposit in Hebei Province and Their Genetic Significance

The Zhangjiakou gold deposit in the northwest of Hebei is a large-size quartz vein type deposit on the northern margin of the North China platform. The present paper deals in detail with characteristics of two major types of ore-bearing quartz (milky quartz and ashy quartz) from this deposit in such aspects as gas-liquid inclusions and their compositional characteristics,micro-deformation, and pomorphic characteristics of the composition and of the cell parameters.In addition, a discussion is made on the relationship between gold content and different typomorphic characteristics of quartz,together with a comparison of typomoiphic characteristics of quartz between this deposit and some other typical gold deposits of the world. The above study shows that ashy quartz is different from milky quartz in such characteristics as gas-liquid inclusions, micro-deformation and trace elements, and that the ore-forming solution of the Zhangjiakou gold deposit must have been a kind of Na+-Ca2+-Cl- type and Na+-Ca2+ -S042- type mesothermal-hypothermal solution with moderate salinity and weak alkalinity.These results combined with the geological setting of the deposit have led the authors to conclude that the Zhangjiakou gold deposit is of metamorphic mesothermal-hypothermal type.