Abstract:Yiliu deposit is an important tungsten deposit of W-Sn polymetallic deposits in Northern Guangdong. The lithology of Baoshan and Yiliu intrusion exposed in the mineral area are both adamellite. Two stages of intrusions which have similar geochemical characteristics: high-SiO₂, peraluminous, K-rich and calc-alkaline, belong to differentiated S-type granite. These intrusions have the same source region which inherits the sediment transition from the intran-continent orogeny environment to intraplate extensional environment, experiences the partial melting of sedimentary rocks and early stage igneous rocks, and enriches the ore-forming elements, such as W and Sn, mainly through the fractional crystallization of magma. The skarn is divided into two groups. The first group of skarn is slightly depleted in large ion lithophile elements, such as Rb, Sr, Ba, and has the high total REE content, with significant negative Eu anomaly. The second group of skarn is highly depleted in large ion lithophile elements and has the lower total REE content, with slightly Eu anomaly. It is believed that the two groups of skarn in the mineral area are the product of the two hydrothermal activities. The skarn type scheelite was formed by contact metasomatism between Baoshan intrusion and sandstone of Maozifeng Formation. Yiliu intrusion’s dissolution hydrothermal filling and metasomatism occurring along the cracks of skarn formed quartz vein type scheelite. The two stages of hydrothermal mineralization events reflect the nature that Yiliu tungsten deposit is a composite deposit.

Key words: Yiliu tungsten deposit; S-type granite; fractional crystallization; two metallogenic stages