青海省化隆县下什堂岩体地质-地球化学特征及其含矿性研究

摘要

作者近几年在青海省化隆地区开展了岩浆型铜镍矿资源潜力评价,重点对下什堂岩体进行了实地调查和研究.岩体地质特征、岩石地球化学特征及区域对比分析表明,下什堂岩体为一铁质系列的超基性-基性岩杂岩体,岩体分异好,有用元素Ni、Cu、Co丰度高,系有利成矿岩体；元素丰度和相关性揭示,该岩体在岩浆成岩演化过程中,硫逸度对元素富集起着明显控制作用,应更有利于硫化矿床的形成.%The paper reports the results on magmatic type copper-nickel ore potential of the Xiashentang intrusive rocks in Hualong County, Qinghai. Petrological and geochemical characteristics of the rocks as well as regional comparative research show that the Xiashentang intrusive rocks are highly differentiated ferruginous ultrabasic-basic rocks with abundant ore metals like Ni, Cu and Co, which are favorable for ore formation. Ore metal abundances and their correlations demonstrate that the sulfur fugacity played a significant role in controling the enrichment of the metals during magma evolution.