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南秦岭花桥钛磁铁矿床赋矿岩石为富碱辉长岩,含矿岩相主要为黑云母辉石岩,岩石由含钛普通辉石和黑云母组成。含矿辉长岩体属典型钠质型碱性岩类,Na2O>K2O,Na2O/K2O值在2.55~5.23之间,碱度率在1.24~1.29之间,MgO含量为5.32%~6.74%,TiO2含量为3.82%~5.84%,Al2O3含量为13.27%~15.06%;属富铁质系列,m/f值为0.37~0.56。在FeO-MgO-Al2O3图解上判别为大陆板内环境。稀土元素总量相对较高,轻稀土元素富集显著,有弱的正Eu异常。花桥钛磁铁矿矿石具有富Fe、Ti、MgO和SiO2不饱和的特点;矿石矿物钛磁铁矿TiO2含量0.415%~23.69%,FeO含量为69.7%~96.18%,Cr2O3含量为0.062%~0.761%。研究表明,南秦岭花桥钛磁铁矿是扬子陆块北缘早古生代幔源低程度部分熔融产物上侵分凝成矿作用的产物。
The mineralized rock of the Huaqiao Titanium Magnetite Deposit in South Qinling Mountains is alkali-bearing gabbro, and the ore-bearing facies is mainly biotite pyroxenite. The rock is composed of titanium-bearing pyroxene and biotite. The ore-bearing gabbro is a typical sodium type alkaline rock with Na2O> K2O, Na2O / K2O between 2.55 and 5.23, alkalinity between 1.24 and 1.29 and MgO between 5.32% and 6.74% TiO2 content of 3.82% ~ 5.84%, Al2O3 content of 13.27% ~ 15.06%; is an iron-rich series, m / f value of 0.37 ~ 0.56. Discrimination on the FeO-MgO-Al2O3 diagram for the continental plate environment. The total amount of rare earth elements is relatively high, light rare earth element enrichment is significant, there are weak positive Eu anomalies. The Huaqiao Titanomagnetite ore has the characteristics of being rich in Fe, Ti, MgO and SiO2. The content of TiO2 is 0.415% ~ 23.69%, the content of FeO is 69.7% ~ 96.18% and the content of Cr2O3 is 0.062% ~ 0.761%. The results show that the Huaqiao bridge titanomagnetism in the South Qinling Mountains is the result of the adventitious subduction and mineralization on the part of molten products of the Lower Paleozoic mantle from the northern margin of the Yangtze block.