Welcome to visit Geoscience!

Geoscience ›› 2007, Vol. 21 ›› Issue (Suppl): 41-48.

• Engineering Geology and Environmental Geology • Previous Articles     Next Articles

Petrograph and Mineralogy of Two Types of Ore From the Daixian Rutile Deposit, Shanxi, China

JIA Xiu-ming1,2,LI Sheng-rong1, PANG Er-cheng3, SHI Guang-hai1, WU Zhen1, LI Kong-liang1   

  1. 1State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China;
    2Taiyuan University of Technology, Taiyuan, Shanxi030024, China;
    3211 Branch, Survey & Developing Bureau of Geology and Resource, Xinzhou, Shanxi034000, China
  • Received:2006-11-07 Revised:2006-12-15 Online:2007-08-20 Published:2007-08-20

Abstract:

According to colour of rutile, ores of the Daixian rutile deposit, the second biggest rutile deposit in China, can be classified into two types: red and black ore; the red ore generally occurred at upper part of the deposit, overlying the black ore without distinct border. These two ores have contrasting mineral associations: anthothyllite (Ath)+plagioclase(Pl)+rutile(Rut)+magnesiohornblende(Mhb)+alkline fledspar (Afs) for red ore and anthothyllite+phlogopite(Phl)+epsode(Ep)+Rutile for black ore. A chemical reaction was suggested as Mhb+Afs→Ath+/-Pl+/-Phl(?)based on petrographical observations in red rutile ore, Pl is possibly the transitional phase and complete reactants are Ath + Phl (?). The mineral associations of black ore is thus inferred to be more complete reactants of this reaction. As for rutiles, red rutiles are homogeneous in composition while black ones bear ilmenite exsolution lamellae of up to 2 μm in thickness. We concluded that it is the existence of the lamellae that causes color difference between these two rutiles. The rutile-hosted rocks are metamorphic rocks with amphibolite face, but more work should be done to discuss features of their protolith. This investigation have implications for better mining, selecting and utilizing this deposit.

Key words: rutile deposit, amphibolite face, anthothyllite, ilmenite, Daixian, Shanxi

CLC Number: