胶东地区含金硫化物矿物微量元素分布规律

DISTRIBUTION CHARACTERISTICS OF MICROELEMENTS IN THE Au-BEARING SULFIDES FROM THE GOLD ORE DEPOSITS IN EAST SHANDONG PROVINCE

通过对胶东地区金矿床矿石矿物和脉石矿物微量元素地球化学的研究,确定了金矿床、主成矿阶段矿物中微量元素的分布特征.揭示了温度、压力(深度)、围岩蚀变作用等对成矿作用的影响和矿床间成矿物理化学条件的差异,指示了微量元素的找矿信息.

The East Shandong Province is a main gold - producing area in China. This paper presents a systematic study about the distribution chracteristics of sulfide and gangue minerals of the deposits. It is revealed that temperature, pressure (depth) and wall rock alteration are of influential factors on gold mineraliztion and that individual gold deposits are different in their physico - chemical conditions.Different sulfide has different ratio of Au and Ag. Low ratio are with pyrite. Au, Ag content of sulfides is different with their forming stages. Maximum of Au and Ag is coincided with the main mineralization stage.Pyrite from the gold bearing vein - type deposit has Co/Ni ratios is 1 and Co content is decreased, Ni content increased with the decrease of ore-forming temperature.Pyrite from the fractured-altered rock type of Sanshandao and Jaojia gold deposits has Co/Ni ratios< 1、This ratio may be resulted from metasomatism of the wall rock during which Fe, Mg, Ni of biotite merged into ore - forming fluid. Pyrite of Xincheng and Hedong gold deposit has decreased Co values and increased Ni values with increasing depth.Co valuse of quartz is 1 - 7 ppm; Ni, 5-13ppm. Co/Ni ratio is 1 - 0.125. Au-Ag-Co/Ni. Plot of quartz and pyrite illustrates a linear correlation for gold-bearing vein type deposit. Gold and silver mineralization is closely related to the distribution of Co and Ni in pyrite and quartz. For fractured-altered rock type gold deposits, it is related to Co, Ni distribution in quartz, not related to that in pyrite.