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Timing of the Early Paleozoic Yangtze and Cathysian Convergence: Constraint from U-Pb Geochronology of Hydrothermal Zircons from Mafic Mylonite within the Shoucheng-Piaoli Ductile Shear Zone, Northern Guangxi 被引量:8
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作者 QIN Ya FENG Zuohai +2 位作者 HU Rongguo LI Saisai WANG Chunzeng 《Acta Geologica Sinica(English Edition)》 CAS CSCD 2018年第5期2030-2031,共2页
Objective The northern Guangxi region is in the southwestern part of the Southern China continent,which is located at the junction of the southwest section of the Early Paleozoic Yangtze block and Cathaysian block.A s... Objective The northern Guangxi region is in the southwestern part of the Southern China continent,which is located at the junction of the southwest section of the Early Paleozoic Yangtze block and Cathaysian block.A series of NNE-trending ductile shear zones are developed in this region,and these ductile shear zones are mostly previously suggested boundary faults of the Early Paleozoic Yangtze block and Cathaysian block,such as the Shoucheng–Piaoli ductile shear zone in Northern Guangxi (Meng Yuanku et al., 2016; Zhang Xuefeng et al., 2015). 展开更多
关键词 Pb Th Northern Guangxi Timing of the Early Paleozoic Yangtze and Cathysian Convergence Constraint from U-Pb Geochronology of hydrothermal Zircons from Mafic Mylonite within the Shoucheng-Piaoli Ductile Shear zone
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Relationship between Landslides, Geologic Structures, and Hydrothermal Alteration Zones in the Ohekisawa-Shikerebembetsugawa Landslide Area, Hokkaido, Japan
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作者 Hiroyuki Maeda Takashi Sasaki +3 位作者 Kazuyuki Furuta Katsuhiro Takashima Akihiro Umemura MasanoriKohno 《Journal of Earth Science and Engineering》 2012年第6期317-327,共11页
This paper elucidates the relationship between landslides, geologic structures, and hydrothermal alteration zones based primarily on X-ray powder diffraction and uniaxial compressive strength tests on weakly weathered... This paper elucidates the relationship between landslides, geologic structures, and hydrothermal alteration zones based primarily on X-ray powder diffraction and uniaxial compressive strength tests on weakly weathered and hydrothermally altered rocks from the Ohekisawa-Shikerebembetsugawa landslide area in Teshikaga Town, Hokkaido, Japan. The OHS (Ohekisawa slide) occurred on a dip slope of sedimentary rocks from the Upper Miocene Shikerepe Formation within a homocline, and also on weathered and hydrothermally altered rocks within the boundary area between the hydrothermal smectite zone and smectite-bearing mordenite zone. The SHS (Shikerebembetsugawa slide) occurred on a dip slope of sedimentary rocks from the Upper Miocene Hanakushibe Formation within wavy folds and was also controlled by a cap rock of Teshikaga Volcano Somma Lava. The SHS occurred also on weathered and hydrothermally altered rocks within the boundary area between the hydrothermal smectite zone and smectite-bearing laumontite zone. The mechanical properties of smectite, smectite-bearing mordenite, and smectite-bearing laumontite zone weakly weathered rocks indicate that they are very weak, soft rocks. These landslides are regarded as HAZLs (hydrothermal alteration zone landslides). The hydrothermal alteration yielding smectite is thus closely related to these two ancient landslides, suggesting that the potential for HAZLs within a hydrothermal area can be assessed based on the swelling clay mineral-beating hydrothermal alteration types, dip slope, and cap rock. 展开更多
关键词 HAZL hydrothermal alteration zone landslide) swelling clay mineral-bearing hydrothermal alteration zone weatheredand hydrothermally altered soft rock dip slope cap rock.
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Dissolution Precipitation Wave Structure of Hydrothermal Ore Zoning
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作者 Yu Chongwen(Faculty of Earth Sciences, China University of Geosciences,Wuhan 430074)Jiang Yaosong Xiao Zhengyu(Department of Computer Science,China University of Geosciences, Beijing 100083) 《Journal of Earth Science》 SCIE CAS CSCD 1995年第1期85-96,共12页
Hydrothermal ore zoning is a transport-reaction problem in which infiltration is the principal Prcness of transport and dissolution/Precipitation is the Principal process of chemical reactions.Neglecting diffusion an... Hydrothermal ore zoning is a transport-reaction problem in which infiltration is the principal Prcness of transport and dissolution/Precipitation is the Principal process of chemical reactions.Neglecting diffusion and ion exchange/adsorption would not affect the basic attributes of hydrothermal ore zoning. Hydrothermal ore zoning belongs essentially to infiltration metasomatic zoning, it results from the formation and propagation of dissolution/precipitation waves through Permeable media. The authors apply the theory of coupled infiltration and dissolution/precipitation reactions in Physicochemical hydrodynamics to studying the structural characteristics of dissolution/precipitation waves, and apply furthermore the coherence principle in dynamic theory of multicomponent coupled systems to revealing the dynamic mechanisms of their formation. The results of investigation verify and develop . C. 's theory of infiltration metasomatic zoning,on the one hand, raising it from the qualitative, equilibrium thermodynamic basis to the quantitative dynamic level;on the other hand, and more importantly, applying theories of Physicochemical hydrodynamics and dynamics of multicomponent coupled systems to bringing to light the dynamic mechanisms of formation of the structure of hydrothermal ore zoning, and advancing a theory of hydrothermal ore zoning, putting forward new ideas on the nature of the problem of hydrothermal ore zoning, the essence of hydrothermal ore zoning and the structural characteristics and mechanisms of formation of hydrothermal ore zoning. 展开更多
关键词 hydrothermal ore zoning transport-reaction infiltration metasomatism dissolution/ Precipitation waves Physicochemical hydrodynamics theory of coupled infiltration and dissolution/precipitation reactions dynamic theory of multicomponent coupled systems c
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