Next Article in Journal
High-Grade Flake Graphite Deposits in Metamorphic Schist Belt, Central Finland—Mineralogy and Beneficiation of Graphite for Lithium-Ion Battery Applications
Next Article in Special Issue
Microstructure Investigation of Oil-Bearing Rhyolites: A Case Study from the Hailar Basin, NE China
Previous Article in Journal
Mineralogy of a High-Temperature Skarn, in High CO2 Activity Conditions: The Occurrence from Măgureaua Vaţei (Metaliferi Massif, Apuseni Mountains, Romania)
Previous Article in Special Issue
Mg-Phengite in Carbonate Rock Syngenetically Formed from Hydrothermal Fluid: Micro-Textural Evidence and Mineral Chemistry
Open AccessArticle

Sequential Scheelite Mineralization of Quartz–Scheelite Veins at the Sangdong W-Deposit: Microtextural and Geochemical Approach

1
Department of Earth System Sciences, Yonsei University, 50 Yonsei-ro, Seoul 120749, Korea
2
Korea Institute of Geoscience and Mineral Resources, 905 Yeongilman-daero, Pohang 37559, Korea
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(8), 678; https://doi.org/10.3390/min10080678
Received: 30 June 2020 / Revised: 25 July 2020 / Accepted: 29 July 2020 / Published: 30 July 2020
(This article belongs to the Special Issue Microtexture Characterization of Rocks and Minerals)
The Sangdong W (tungsten)-deposit is known as one of the world’s largest W-deposits, a magmatic–hydrothermal ore deposit including both skarn and hydrothermal alteration zones. The strata-bound characteristic of the deposit resulted in three major orebodies (hanging wall, main, footwall). The main ore mineral is a scheelite (CaWO4)–powellite (CaMoO4) solid solution. We examined the fluid evolution and scheelite formation process of the quartz–scheelite veins of the ore deposit, based on the microtextures and geochemical characteristics of the scheelite. After the initial magmatic–hydrothermal fluid release from the granitic body, prograde skarn is formed. In the later prograde stage, secondary fluid rises and precipitates stage I scheelite. Well-developed oscillatory zoning with the highest Mo content indicates continuous fluid infiltration under an open system. Pressure rises as mineralization occurs, generating the pressure release of the retrograde fluid. Fluid migrates downward by the gravitational backflow mechanism, forming stage II to IV scheelites. Dented oscillatory zoning of stage II scheelite is strong evidence of this pressure release. Stage III and IV scheelite do not show specific internal structures with pure scheelite composition. Retrograde scheelites are formed by fractional crystallization under a closed system. The observation of systematical fractional crystallization in the quartz–scheelite vein system is a meaningful result of our research. The geochemical characteristics and microtextural evidence imprinted in scheelites from each stage provide crucial evidence for the understanding of sequential scheelite mineralization of the quartz–scheelite vein system of the Sangdong W-deposit. View Full-Text
Keywords: Sangdong W-deposit; quartz–scheelite vein system; oscillatory zoning; systematical fractional crystallization Sangdong W-deposit; quartz–scheelite vein system; oscillatory zoning; systematical fractional crystallization
Show Figures

Figure 1

MDPI and ACS Style

Choi, W.; Park, C.; Song, Y.; Park, C.; Kim, H.; Lee, C. Sequential Scheelite Mineralization of Quartz–Scheelite Veins at the Sangdong W-Deposit: Microtextural and Geochemical Approach. Minerals 2020, 10, 678. https://doi.org/10.3390/min10080678

AMA Style

Choi W, Park C, Song Y, Park C, Kim H, Lee C. Sequential Scheelite Mineralization of Quartz–Scheelite Veins at the Sangdong W-Deposit: Microtextural and Geochemical Approach. Minerals. 2020; 10(8):678. https://doi.org/10.3390/min10080678

Chicago/Turabian Style

Choi, Woohyun; Park, Changyun; Song, Yungoo; Park, Chaewon; Kim, Ha; Lee, Chulgyoo. 2020. "Sequential Scheelite Mineralization of Quartz–Scheelite Veins at the Sangdong W-Deposit: Microtextural and Geochemical Approach" Minerals 10, no. 8: 678. https://doi.org/10.3390/min10080678

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop