地质通报2012，Vol.31Issue(7)：1184-1191,8.
南秦岭地区花桥富碱辉长岩地球化学特征及其含矿性
Geological and geochemical characteristics and ore-bearing potential of alkali-rich gabbro in Huaqiao, southern Qinling area.
摘要
Abstract
The ore-bearing rock of the Huaqiao titanomagnetite deposit in southern Qinling area is alkali-rich gabbro. and its ore-bearing petrofacies is mainly biotite-pyroxenolite composed of titaniferous augite and biotite. The ore-bearing gabbro belongs to typical agpaitic alkaline rock, in which Na2O>K2O, Na2O/K2O is 2.55-5.23, alkalinity ratio (AR) is 1.24-1.29, MgO is 5.32%-6.74%, TiO2 is 3.82%-5.84%, Al2O3 is 13.27%-15.06%, and m/f=0.37-0.56, belonging to ferruginous rock. It occurred in an intraplate environment, as judged by the FeO-MgO-Al2O3 graphical method. The Huaqiao alkali—rich gabbro is also characterized by a relatively high total REE content and a marked enrichment of LREE as well as weak Eu anomaly. The titanomagnetite ores in Huaqiao arc enriched in Fe, Ti and MgO, but its SiO2 is unsaturated. In the magnetite, TiO2 is 0.415%-23.69%, FeO is 69.7%-%.18%, and Cr2O3 is 0.062%-0.761%. All these characteristics show that the Huaqiao titanomagnetite deposit resulted from magmatic segregation and mineralization of the low-degree partial fusing product of mantle source material on the northern edge of the Yangtze block in the early Paleozoic period.关键词
南秦岭/富碱辉长岩/钛磁铁矿床/地球化学特征Key words
southern Qinling/alkali-rich gabbro/titanomagnetite deposit/geochemical characteristics分类
天文与地球科学引用本文复制引用
王伟,李天虎,罗小平,张欣,彭桥梁,宿晓虹,荆平,李智明,宋忠宝,孙健,全守村,李宗会,郭周平..南秦岭地区花桥富碱辉长岩地球化学特征及其含矿性[J].地质通报,2012,31(7):1184-1191,8.基金项目
中国地质调查局项目《陕西平利—镇坪地区矿产远景调查》(编号:1212011085107) （编号:1212011085107）
