CL-heterogeneity and REE in
scheelite from a grand pollymetallic
deposit in South Hunan, China
TENG DING, DONGSHENG MA*, JIANJUN LU
School of Earth Sciences and Engineering, Nanjing
University, Nanjing 210023, China (*correspondence:
dongsma@qq.com)
Huangshaping deposit is a grand pollymetallic deposit
comprised of skarn-type W–Mo and distal Pb–Zn orebodies
occuring in South Hunan Province, China [1]. We found that
scheelite from the deposit includes a dark core and a bright
mantle by cathodoluminescence (CL) observation, and can be
further subdivided into four groups based on the CL feature
and REE signatures analyzed by in situ LA–ICP–MS, as
shown in the figure below. The core of the scheelite shows
the characteristic of LREE rich and HREE depleted with
significant high Mo contents, whereas the mantle is rich in
MREE with strongly negative Eu anomaly and low Mo
concentrations, compositionally similar to the scheelite from
typical skarn-type W (Mo) deposits [2] and low-middle
tempreture quartz vein-type Au–W deposits [3, 4],
respectively. This result, combining with other evidence,
indicates the transitions of ore-forming fluids from magmaitc
fluids to lager scale hydrothermal circulation systems during
W mineralization within Huangshaping deposit and could be
used to decipher the formation of this grand pollymetallic
deposit.
Figure 1: Triangular LREE-MREE-HREE diagram of the
scheelite from Huangshaping deposit.
[1] Ding et al. (2016) Ore Geol. Rev. (accepted). [2] Song et
al. (2014) Am. Mineral. 99, 303-317. [3] Ghaderi et al. (1999)
Econ. Geol. 94, 423-438. [4] Dostal et al. (2009) Miner.
Petrol. 97, 95-109.