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Late North Silurian lead-zinc mineralization regularity and prospecting direction

Author: ZhaoGuoBin
Tutor: ZuoHeMing
School: Chang'an University
Course: Mineralogy,petrology, Mineral Deposit Geology
Keywords: Mid- north region Silurian lead-zinc deposits Geological and geochemical characteristics Metallogenic regularity Edge of the mineralization Prospecting Direction
CLC: P618.4
Type: Master's thesis
Year: 2005
Downloads: 242
Quote: 1
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Abstract


In a more in-depth systematic study summarizes the Silurian lead-zinc deposits Geological characteristics and geochemical characteristics based on the mid-north region, focusing on the metallogenic regularity and prospecting direction for the future of the region. According to the characteristics of lead-zinc output layers and the spatial distribution, from north to south, the study area Journals Silurian lead-zinc deposits can be divided into three ore zones, the North with Si ditch - Nanshagou lead-zinc mineralization with red slopes - Han ditch - minor groove lead-zinc mineralization with an intermediate zone of the south with the West Camp - Yellowstone plate lead-zinc-copper mineralization with. Late Northern Silurian lead-zinc deposits produced in the fine-grained clastic rocks, the ore body layered stratiform and lenticular, integrated output with the formation, occurrence and surrounding rock and wall rock synchronization fold . Ore single-zinc ore mixed, followed by lead and zinc ore, the individual lead ore is relatively rare. Ore minerals consists predominantly of sphalerite, galena times. Ore structures are mainly disseminated structure layer massive structure, followed by a banded structure, lamellar structure, vein structure, brecciated structure. Type of wall rock alteration, silicification, chlorite, sericite, pyrite and so on. General orebody roof and floor wall rock alteration asymmetry, characterized by strong alteration of the base plate. The area ALBITITE, siliceous rocks close to hydrothermal sedimentary rock with lead-zinc deposits. Ore and hydrothermal sedimentary rock geochemical characteristics of trace elements, sulfur isotope, hydrogen and oxygen isotopes, lead isotopes, rare earth elements composition is quite similar, but significantly different from the normal sedimentary rocks. Lead-zinc deposits of the area is a hot deposition - the transformation causes of, ore-forming metals from the basin under basal rocks and deep strata, sulfur derived from seawater sulfate-reducing sulfur ore-forming fluids of seawater, but. Metallogenic model: underground ore hot water convector - fracture occurs along with the Health submarine exhalation sedimentary mineralization - structure superimposed hydrothermal transformation of enrichment. This paper focuses on the mid-north region Silurian system Pb-Zn deposit metallogenic regularity that the stratigraphic contemporaneous faults, the Precambrian basement and three sedimentary basins control the formation and distribution of lead-zinc belt, into The mine environment abrupt interface, the nature of the ore-forming fluid evolution interface, ore-forming fluids - the action of the environment interface, late tectonic, hydrothermal reworking interface geochemical interface to control the positioning of the ore body, the same deposition depression, the development of sand-shale interface layers, layer fracture superimposed with seam lots and the development of hydrothermal alteration lots of lead-zinc enrichment lots tectonism and hydrothermal activity after the hydrothermal sedimentary mineralization formed earlier lead-zinc body further transformation enrichment . The same time, the authors also proposed that the spatial and temporal edge of mineralization system that control the northern edge of the Yangtze plate South Qinling belt, the three basin margin and syngenetic fracture edge control mid-northern lead-zinc with lead-zinc deposits by lithologic level anticline structure control, and different rock interface control lead-zinc body. Finally, summed up the regional Silurian lead-zinc ore flag, analysts believe the south bank of the Han River, Shuanghe, Baihe County Yellowstone plate lead-zinc district to the west and well-being area has further exploration potential.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Non-ferrous metals
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