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[en] Geophysical logging has an important role in in-situ leaching uranium mining. Based on the date of the geophysical logging, it can be divided into the strata and lithology, determined the location and grade of the ore, applied to check the cementing and quality of the well in in-situ leaching uranium mining. This paper mainly focuses on the effect of gamma logging, spontaneous potential logging, density logging, sonic logging, well temperature logging, current logging, well deviation logging in checking cementing and quality of the well, and explains the geophysical logging is an effective method in in-situ leaching uranium mining. (authors)
[en] In this paper, geological deduction, fluid inclusion and fission track and their development are discussed in detail. Geological deduction is a method to inferring the metallogenic depth by studying metallogenic geodynamic environment and the ore-controlling structures, ore mineral composition, geochemical element composition, ore-forming rocks and ore body extension. Fluid inclusion is a method to acquire the metallogenic depth by measuring the homogenization temperature, salinity, and calculating the density and pressure. Fission track is a method to discuss the metallogenic depth after calculating the parameters such as fission track age, uplifting rate, erosion rate and erosion quantity. Finally, status and main points of the metallogenic depth researches of hydrothermal uranium deposits are commented. (authors)
[en] The Jingdezhen ductile shear zone is evolved from the Neoproterozoic Zhangyuan ophiolite mélange belt in the eastern Jiangnan Orogen, South China. Comprehensive study of geometry, kinematics, quartz c-axis fabric, temperature-pressure conditions and geochronology were conducted in this study. The Jingdezhen shear zone extends ∼180 km along the NE orientation with two groups of subvertical foliation and subhorizontal lineation. One group of foliation strikes NEN orientation whereas another one NEE orientation. Field investigation, microscopic observation and quartz c-axis fabric show that sinistral shearing along NEN-striking foliation occurred earlier than dextral shearing along NEE-striking foliation. Syn-tectonic staurolite porphyroblasts and deformation manner of feldspar imply that sinistral shearing occurred at 530–420 ºC and 6–2 kbar. Deformation manner and c-axis fabric of quartz and pre-tectonic staurolite porphyroblasts indicate that dextral shearing took place at 420–300 ºC. LA-ICP-MS zircon U-Pb and mica 40Ar/39Ar dating indicate that the sinistral shearing occurred during Neoproterozoic orogeny (830–800 Ma) whereas the dextral shearing at 447±12 Ma. The sinistral shearing resulted from the Neoproterozoic final assembly between the Yangtze and Cathaysia blocks. The dextral shearing was caused by Early Paleozoic orogen parallel extension and clockwise rotation.