Abstract
The Tongshankou skarn deposit in the Edong ore district is a typical metasomatic deposit associated with adjacent granodiorite porphyry and carbonate rocks. Using comprehensive microscopic observations, mineralogical and geochemical analysis, scheelite grains in the skarns can be classified into three major types, showing multi-stage mineralization characteristics. In the redox fluid environment, scheelites that occur with garnets usually have affinity to garnets, while in later skarn phases others exist with oxides and sulfides. They can be subdivided by trace elements, such as Nb and Eu, to discuss the detailed ore-forming process. Scheelites have three typical substitution mechanisms including: 2Ca2 + ⇌ REE3 + +Na+ (1); Ca2 + + W6 + ⇌ REE3 + +Nb5+(2); and 3Ca2 + ⇌ 2REE3++ □Ca (□Ca = Ca site vacancy) (3). Plagioclase or various hydrothermal stages can cause Eu anomalies to fluctuate from positive to negative, and these processes can cause particular zonation in W and Mo contents in scheelites. This study highlights the use of texture and geochemistry of scheelites in skarn deposits, depicting the W mineralization processes.
Highlights
Tungsten has been listed as one of the most important industrial metals in alloy manufacturing, with a wide range of applications, and has been listed as one of the critical metals by most developed countries due to its strategic importance [1]
The purpose of this research is to investigate the tungsten provides insight into the ore prospecting based on the ore-forming processes and geochemmetallogenic process in order to illustrate the genesis of scheelite mineralization in ical characteristics
Major element compositions and elemental mapping were analyzed by electron microprobe analysis (EMPA) at the State Key Laboratory of Geological Processes and Mineral
Summary
Tungsten has been listed as one of the most important industrial metals in alloy manufacturing, with a wide range of applications, and has been listed as one of the critical metals by most developed countries due to its strategic importance [1]. The Edong ore district, located in the Middle–Lower Yangtze River belt (MLYRB), is a multi-metal metallogenic belt containing mostly porphyry and skarn type deposits. The ore district includes the Tongshankou porphyry-skarn Cu-Mo-(W) deposit, and has a comparable geological environment to the adjacent Ruanjiawan and Fujiashan-Longjiaoshan W deposits [2,3,4]. Scheelite is the main tungsten mineral in both the porphyry and skarn systems in the Tongshankou area. There has been, no comprehensive study on the genesis of scheelites and the W transportation mechanism in the Tongshankou deposits. A cold cathodoluminescence study revealed pores and inner texture in scheelite, indicating multi-stage ore formation [5]. Tungsten is mostly concentrated in mafic enclaves compared to diorite intrusions and limestone stratum, which may have originated from a different magma source due to mantle upwelling [6].
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