Gabbro-norite masses in Yuxian, Shanxi:characteristics and ore potential
-
摘要: 盂县辉长苏长岩体分为两个相带:边缘相为蚀变中细粒辉长岩,中心相为蚀变中粗粒辉长岩。m/f值介于0.41~2.10之间,属铁质基性岩。区内有钠化辉长苏长岩,钠高、铁低,其原岩细粒辉长苏长岩则是钠低、铁高,表明钠化使铁质活化、转移和富集。含矿岩体下部表现为高电阻、低极化率、强磁性特征,辉长岩体底部及边部可能富集形成钒钛磁铁矿和金属硫化物矿床。Abstract: Two facies belts may be discriminated for the gabbro-norite masses in Yuxian, Shanxi:the marginal facies consisting of altered medium-to fine-grained gabbro and the central facies composed of altered medium-to coarsegrained gabbro. The m/f ratios range between 0.41 and 2.10, indicating a kind of ferruginous basic rocks. The albitized gabbro-norite from the study area is characterized by higher Na contents (Na2O=4.98%) and lower Fe contents (TFe=3.36%), while their protoliths fine-grained gabbro-norite by lower Na contents (Na2O=1.02%) and higher Fe contents (TFe=11.64 -14.94%), implying that the activation, migration and enrichment of Fe were caused by albitization. The lower part of the ore-bearing rocks has higher electrical resistivity, lower polarizability and strong magnetism. The vanado-titano-magnetite deposits and metallic sulphide deposits may be emplaced in the basal and marginal parts of the gabbro masses.
-
Keywords:
- Yuxian /
- gabbro-norite mass /
- Archean /
- Shanxi
-
计量
- 文章访问数: 123
- HTML全文浏览量: 0
- PDF下载量: 67
下载:
