| Citation: |
GAO Weili, LÜ Guxian, XUE Changjun, LÜ Chengxun, MIAO Qiangjun. The metallogenic structural system and metallogenic regularity of the Huayuan lead-zinc orefield in western Hunan Province[J]. Geological Bulletin of China, 2020, 39(11): 1759-1772.
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The metallogenic structural system and metallogenic regularity of the Huayuan lead-zinc orefield in western Hunan Province
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Abstract
Typical stratabound lead-zinc deposits are developed in the Huayuan lead-zinc orefield, western Hunan Province, with great prospecting potential. Many researchers have systematically studied the geological characteristics of the deposits in this area, but there are different opinions on the genesis of the deposits and ore-controlling factors. There are four main viewpoints: Mississippi Valley type, sedimentary type, post-diagenetic reformation type and basin-source low-temperature hydrothermal type. In this paper, the relationship between structure and mineralization was analyzed by means of structural measurement and analysis and palaeostress field recovery, and the tectonic stress was divided into three stages: the principal compressive stress of premetallogenetic structure is in approximately vertical direction to layers, and the principal compressive stress of metallogenic period is in NW-NNW direction, the principal compressive stress after mineralization is in NE-NNE direction. The Limei gentle anticline and Yutang anticline were formed in the orefield during the metallogenic period, and various ore-bearing breccias and fracture systems were formed in the algal limestone layer. These fractures provided a rich reaction interface for the chemical reaction between the hydrothermal solution and the organic matter in algal limestone, which seems to be the main reason for the enrichment of the lead-zinc ore solution. Post-metallogenetic structure was formed during Yanshanian period. A large strike-slip normal fault zone was formed under NNE-SSW compressional stress, which destroyed and reworked the ore-bearing fold during the Caledonian period.
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References
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GAO Weili, LÜ Guxian, XUE Changjun, LÜ Chengxun, MIAO Qiangjun. The metallogenic structural system and metallogenic regularity of the Huayuan lead-zinc orefield in western Hunan Province[J]. Geological Bulletin of China, 2020, 39(11): 1759-1772.
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Figure 1.
Simplified geological map of the study area
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Figure 2.
Images and sketch drawing of Huayuan-Chadong fracture(a, b) and Malichang fracture(c, d)
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Figure 3.
The characteristics of joints before mineralization (a~d), the rosette (e) and pole density(f) maps of joints
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Figure 4.
The characteristics of ore-forming joints (a~d), the rosette (e) and pole density(f) diagrams of joints
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Figure 5.
The characteristics of joints after mineralization (a~d) and the rosette (e) and pole density(f) diagrams of joints
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Figure 6.
Schematic diagram of structural fracture system and various breccias
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Figure 7.
Sketch of tectonic evolution of the Huayuan lead-zinc orefield
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Figure 图版Ⅰ.