【作者】 史仁灯； 杨经绥； 王希斌； 郑新华；

【Author】 Shi Rendeng Yang Jingsui Wang Xibing Zheng Xinhua(Institute of Geology, GAGS, Beijing)

【机构】 中国地质科学院地质研究所；

【摘要】 德尔尼铜矿区异剥钙榴岩呈透镜状产在Ⅰ号矿体附近的层状辉长岩中,此辉长岩为德尔尼蛇绿岩之重要组成部分,异剥钙榴岩主要由(水)钙铝榴石和单斜辉石等组成,石榴子石含钙铝榴石分子81.30%～87.54%、水钙铝榴石0.76%～11.60%、钙铁榴石0.53%～5.91%及000～10.45%镁铝榴石,单斜辉石则主要是普通辉石-次透辉石,而硬玉分子只有1.24%～3.23%,平均2.17%.根据异剥钙榴岩的单斜辉石的温度计估算表明,异剥钙榴岩的蚀变温度为(541.57±21.57)℃;据辉石中的硬玉分子含量,估算其形成压力小于800MPa.根据异剥钙榴岩和辉长岩野外地质产状、镜下特征及其地球化学特征的相似性,推测该异剥钙榴岩的原岩为辉长岩.异剥钙榴岩、辉长岩的无矿化现象及其稀土元素配分模式与矿石的相异性推断异剥钙榴岩和辉长岩并非成矿物质的源区.更多还原

【Abstract】 Rodingite has been found in Dur’ ngoi copper deposit district, Maqen town, Qinghai province in China, by author and professor Yangjingsui et al. in 1997. This rodingite is composed of sahlite - augite and garnet which is mainly composed of grossular and hydrogrossular. This paper stresses on discussing the petrology, mineralogy and major elements, trace elements (including REE) of rodingite and gabbro. It suggests that rodingite was drived from gabbro, and the alteration temperature and pressure is (541. 57 + 21.57)t ,less than 800MPa respectively. According to the differnce between the Rare Earth Elements models of rodingite( gabbro) and ore, and the barren rock alteration in rodingite, it deduced that rodingite and gabbro are not the source region of ore - forming material.更多还原