Objectives:The Darongxi tungsten deposit, situated in Xuefeng mountain of the Ghiangnania terrain between the Yangtze and Cathaysian blocks, western Hunan, is a typical stratabound scheelite deposit where the W mineralization is hosted by skarn and quartz stockworks along the contacts among metasandstone, marble and slate in the Lower Member of Nantuo Formation belonging to Nanhuan System. The stratabound scheelite skarns and stockworks in this deposit contain amounts of garnets and pyroxenes which are generated by the diffusion metasomatism between host rocks and the fluid deriving from the intrusion of the Dashenshan granitic stock. This work tries to provide some advices and evidences for how to reveal the formation mechanism of stratiform and stratabound tungsten skarn in the future. Methods: As the major skarn minerals, garnet and clinopyroxene from the scheelite skarns and stockworks were studied. Based on the field investigation and the microscopic observation, the major elements and trace elments compositons of garnet and clinopyroxene were analysed by EPMA and LAICPMS at the State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (Guiyang).Determination of the major element compositions of garnet and clinopyroxene was performed by wavelength—dispersive spectrometry using an EPMA1600 electron probe microanalyser, at an accelerating voltage of 25 kV, a beam current of 10 nA, a beam diameter of 10 μm, and using artificial synthesized silicate and oxide minerals as standards. The calculations are based on the Geokit (2010) excel program.Twenty eight trace elements of garnet and clinopyroxene were analysed by laser ablation inductively coupled plasma mass spectrometry (LAICPMS) using PerkinElmer Sciex ELAN DRCe ICPMS. The laser was operated with a 40μm diameter beam and ablating number frequency 120. Calibration was performed using NIST SRM610 glass as external standard, and BIG1G, BHVO2G, BCR2G, GSE1G, QC KL2 and QC ML3B standards, with 29Si and 44Ca, previously determined by electron microprobeanalysis, as an interal standard. Detection limit for LAICPMS is below 0.1 ppm for most elements, and in run precision is <5%. The calculations are based on the ICPMSDataCal (V8.4) excel program.Results: In the Darongxi deposit, pyroxenes from tungstenbearing skarns and stockworks belong to diopside—hedenbergite —johannsenite series （Di11.5~67.1Hd10.6~81.2 Jo6.00~34.3）, and garnets are mainly grossularite（Gro43.9~78.1And3.3~12.6 Spe+Alm10.7~50.3） with the relatively high spessartine+almandite component. The pyroxene is characterized by enriced in Zn, W and U, with LILE and HFSEdeplated, low REE concentrations, no obvious fractionation between LREE and HREE, and positive Ce and Eu anomaly. Garnet exhibits strongly enriched in U, Zr, Ga, Nb, but deplated in Rb, Sr, Ba, which has higher REE concentrations, obvious HREE enrichment, negative Ce anomaly and strongly positive Eu anomaly. Incoporation of trace element and rare earth element into pyroxene and garnet are predominately controlled by their crystal chemistry. Positive Ce and Eu anomaly of pyroxene may be affected by the fluid—rock interaction and different redox conditions. Incoporation of REE into garnet follows along with REE3+substituting for Al3+and Eu2+substituting for Ca2+, whereas the negative Ce anomaly may be related to the mineralization fluid which is depleted in Ce due to the early crystallization of pyroxene.Conclusions: The tungstenbearing skarn of the Darongxi deposit belongs to the reduced skarnoid which is generated by the diffusion metasomatism between the hydrothermal fluid and the Mnrich limestone.However, the pyroxene and garnet from the stockwork orebody may be formed by the metasomatism between the fluid and the calc metasandstone. During the formation of skarn, Mndepleted pyroxene and garnet resulted from the diffusive metasomatism under the condition of relatively high temperature and moderate W/R ratios, while Mnrich pyroxene and garnet trended to be deposited near the walk rock under low temperature and W/R ratios condition, and partial Mn maybe be derived from the metasomated wall rocks.