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Geochronology,petrogenesis,and geological significance of the quartz vein-type copper deposits in Longwei area,north-west Dayaoshan,Guangxi

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Frontiers of Earth Science 2024年第1期18卷 68-82页

作者： Song FU Shehong LI Changxing LV Longqing SHI Xuhan HU Jinming WU Zhuolin XIE College of Earth Sciences&Engineering Shandong University of Science and TechnologyQingdao 266590China School of Earth Sciences Guilin University of TechnologyGuilin 541006China Xinwen Mining Group Co. Ltd.Huafeng Coal MineTai’an 271409China

Quartz-vein-type copper deposits were discovered in SN-trend ore-bearing structures in north-west Dayaoshan,*** of reports on the precise metallogenic age of these deposit has become a bottleneck in metallogenic research in this *** this study,the quartz vein-type copper mine in Longwei area of Jinxiu was selected as the research *** illite samples in the fault gouges and ore samples were collected for testing and *** on the Re-Os isotope dating study,the age of pyrite isochron,belonging to the Caledonian period,was determined to be 417±25 Ma,whereas that of chalcopyrite isochron belonging to the Indosinian period,was found to be 243±18 *** crystallized considerably earlier than *** obtained EPMA data were combined with rock mineralogical analysis data,Metasomatous mineral pyrite and metasomatic mineral chalcopyrite were identified to have originated from different hydrothermal *** the Indosinian period,copper deposits in the Longwei area underwent pyrite crystallization,pyrite fragmentation,copper-bearing hydrothermal filling,and metasomatism,consolidating and forming *** study determined the mineralisation time and ore sources of copper deposits in the Longwei *** study provides evidence for the existence of Indosinian hydrothermal activities in the north-western Dayaoshan area.

关键词： Re-Os dating electron probe micro-analyser quartz-vein copper deposit Dayaoshan area

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EPMA Study of the Interface of β-Tricalcium Phosphate Ceramies in Vivo

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Journal of Materials Science & Technology 2004年第6期20卷 657-661页

作者： Honglian DAI, Xianying CAO, Haichen SHAO, Chunhua SHEN and Shipu LIBiomedicaI Materials and Engineering Center, Wuhan University of Technology, Wuhan 430070, China Biomed. Mat. and Eng. Ctr. Wuhan Univ. of Technol. Wuhan 430070 China

electron probe and X-ray energy spectrum were used to investigate the chemical composition of the interface between material and new bone after porous tricalcium phosphate ceramie implanted in tibia of rabbits. The element changes of the interface, the materials transformation and the situation of new bone formation at different implantation period were observed. The results showed that the carbon element content decreased gradually in new bone tissue, and the content of calcium and phosphor element increased by degrees with the implantation time. At the same time, calcium-phosphor ratio in the new bone kept a higher Ievel. New bone grew into the materials interior, material dispersed and degraded simultaneously. Both composition of materials and new bone tended to be consentient. Finally, the materials were substituted by new bone. After implantation, not only the materials itself dissolved and degraded partially, but also new bone formed on the outer and pore surface of β-TCP porous bioceramics, which shovved that the degradation products of lifeless calcium phosphate inorganic materials took part in constituting of new bone tissue.

关键词： Calcium phosphate electron probe Interface Chemical composition

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