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Mineralization of Ductile Shear Belt Gold Deposit of Bindaban in Xinjiang

Author: ShuJianSheng
Tutor: YangXingKe；ZhangLianChang
School: Chang'an University
Course: Structural Geology
Keywords: Bingdaban ductile shear zone Gold deposits Brittle - tough shape deformation conversion Mineralization Metallogenic model
CLC: P618.51
Type: Master's thesis
Year: 2005
Downloads: 253
Quote: 3
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Abstract


Bingdaban ductile shear zone is an important part of the northern Tianshan large ductile shear zone, is also extremely important zone of gold-copper mineralization typical gold deposits such as Wang Feng Gold Saridala gold mine. This study, relying on the basis of previous data and test a large number of collecting and collating the 1:5 region with the latest achievements of the Geological Survey, to identify the distribution and deformation characteristics of the different scales Bingdaban ductile shear zone. Through regional and typical gold deposits in the system study, analysis of the ductile shear zone ore-controlling mechanism. Typical gold deposits C, H, O, S, Pb stable isotopes, trace rare earth elements and fluid inclusions geochemical characteristics of the gold mine may be forming material source, the nature of the ore-forming fluids, to further explore the Ductile Shear Zone type gold mineralization pattern. Some awareness and results: First, determine the spatial distribution of the ductile shear zone Bingdaban scale, systematic summary of the tectonic deformation. Band with weak strain domain and white interwoven pattern deformation concentrated local strain and strain conversion is characterized. The deformation fabrics diverse, S-C foliation, dial wire structure, rotating porphyroclasts and closed with oblique folds deformation acting extensively developed. Various types of deformation fabrics interspersed intersected comprehensive comparative analysis, composite superimposed its kinematics and dynamics characteristics, divided shear zone deformation stages of the early extrusion shear deformation, the mid-slip brittle - toughness shear deformation and late brittle deformation. Ductile shear zone Bingdaban region, an ore-controlling structure with, and hope, Saridala, peak gold deposits have very similar geological structure, both with the results of the long-term evolution of the shear. The spatial and temporal distribution of the shear zones within the gold deposits are strictly controlled by the brittle - tough shape deformation conversion control. Summarize the following rules: (1) brittle - ductile deformation strength of strain conversion and in situ conversion type of phase conversion type; (2) in the horizontal, vertical and vertical depth control on the strength of the strain and white, and deformation conversion feature deposit, the distribution of the ore body, initially proposed district brittle - ductile deformation distribution structure mode conversion with space and gold (bed) point; (3) brittle - ductile deformation conversion strong site conducive mineralization, and microscopic fissures The site is easy to form bonanza; (4) gold mineralization lag ductile deformation, the main mineralization occurs in shallow brittle - ductile deformation stage or a little later. Summary of previous gold-bearing analysis Saridala gold deposits and gold deposits, Wang Feng, carbon, hydrogen, oxygen, sulfur, lead stable isotope research and comparative study of trace rare earth elements and its surrounding rocks: two typical gold mine in The above areas have similar. Ductile shear zone type gold deposits Bingdaban ore-forming fluids mixed hydrothermal metamorphic, and meteoric hydrothermal mainly. Into the minerals are mainly derived from the Changcheng System Xingxingxia Group metamorphic rocks and late Caledonian S-type granodiorite, part of the material may be derived from a deep subordinates crust or mantle, a multi-source characteristics of Wang Feng GOLD temperature pressure test Analysis of its mineralization uniform temperature between 151.2 ~ 434.5 ℃, the main mineralization temperature at 331.2 ~ 228.2 ℃, followed by 221.0 ~ 151.2 ℃ mineralization. Bursting the Saridala Gold mineralization temperature (170 ~ 410 ℃, the main mineralization temperature of 270 ~ 300 ℃, followed by 335 to 360 ℃; king Curie, 1995) contrast band mineralization occurs mainly in in the low-temperature phase, with the characteristics of multi-stage composite superimposed. The studies estimate the the lookout peak gold mineralization pressure focused on the numerical range of, 22.13 ~ 40.83Mpa and 47.56 ~ 60.87Mpa, two, combined with the results of previous studies comprehensive analysis of the main mineralization in the region began the depth should not exceed 5.6 km, the crust was uplifted to the 2.00km about depth mineralization is most intense, uplift to 1.00km depth

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Precious metals > Gold
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