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GEOCHEMICAL CHARACTERISTICS OF GRANITES AND ITS STRUCTURAL GENETIC ENVIRONMENT IN THE NANDAN-HECHI METALLOGENETIC BELT, NORTHWEST GUANGXI 总被引:3,自引:0,他引:3
The Nandan-Hechi metallogenetic belt is the most important tin-polymetallic producing district in China, and is the location of the Dachang super-large tin deposit. Based on the detailed field investigation and isotopic data, the stages of magmatic activity in the Nandan-Hechi metallogenetic belt have been lined out in this paper. Through the study about the geochemical characteristics of different granites, and by using ω(Al2O3)-ω(SiO2), ω(TFeO)/[ω(TFeO) ω(MgO)]-ω(SiO2), AFM, ACF and Rb-Yb Ta, Rb-Y Nb,Ta-Yb, Nb-Y discrimination diagrams in combination with regional geological setting analysis, the authors carried out analyses about the structural environment for the formation of the granites, and discussed the structural environment and dynamic setting for the large scale mineralization in this area. Our study indicates that the majority of the granites in Nandan-Hechi metallogenetic belt belong to the POG type,while the later stage alaskite belongs to the RRG CEUG type. The granites were formed at the stage of structural transformation from postorogenic phase to intraplate setting. But the major structural environment is characterized by steady regional extension. The formation age for the granites coincides with the time for this transformation, and this translation environment is favored for large-scale metallogenesis. 相似文献
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Xiong Xiong* Institute of Geodesy Geophysics Chinese Academy of Sciences Wuhan China Institute of Geology Geophysics Chinese Academy of Sciences Beijing China Wang Jiye Institute of Geodesy Geophysics Chinese Academy of Sciences Wuhan China Graduate School Chinese Academy of Sciences Beijing China Teng Jiwen Institute of Geology Geophysics Chinese Academy of Sciences Beijing China 《中国地质大学学报(英文版)》2005,16(4)
INTRODUCTION Volcanoesaremostlyobservedinoceanicridges,hotspotsandcontinentalriftzones(Hongetal.,2003),andarerarelyobservedincontinentalinteri ors.However,sincethevolcanoeswithintheconti nentinteriorscannotbeattributedtotheplate/block marginprocess,theydr… 相似文献
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ZHANG Yunxiang CHE Zicheng LIU Liang Department of Geoogy Northwest University Xi*an 《Continental Dynamics》2001,(2)
1. IntroductionThe Qinghai-Tibetan Plateau is an importantregion for the study of the global change andstructural evolution history). The in-depth knowledgeon its uplift process is the ke}' to understand theformation and development of temporary ph}'sicalenvironment of China or even East Asia. Therefore.a large quantity of researchers have given muchmore attention on this field (Burbank et al.. l982;Fang Xiaornin et al.. 1995f Ruddoman. ]997f AnZhisheng et al.. 1998). The macroscopic e\'o… 相似文献
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ZHANG Li LU Xinzhi HAN Feng MA Cuiping and YU Wengong* Marine Drug Food Institute Ocean University of China Qingdao P.R. China 《中国海洋大学学报(英文版)》2007,6(1):80-84
1 Introduction Agarases produced by agar-degrading bacteria are classified into two groups based on their modes of action, namely, α-agarase and β-agarase. They hydrolyze α -1, 3 linkage and β-1, 4 linkage of agarose respectively (Duckworth and Turvey, 1969). Agarases are widely used in food, cosmetic and medical industries for the produc-tion of oligosaccharides from agar (Kobayashi et al., 1997; Yoshizawa et al., 1995). Neoagaro-oligo- saccharides produced by β-agarase inhibit the gro… 相似文献
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介绍了南京信息工程大学环境工程专业近几年在实验、实习、课程设计和毕业设计(论文)教学等方面的改革和实践,对环境工程专业实践教学的改革和完善提出了建议。 相似文献
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Petrogenesis of Mesozoic High-Mg Diorites in Western Shandong: Evidence from Chronology and Petro-geochemistry 总被引:7,自引:0,他引:7
Yang Chenghai College of Earth Sciences Jilin University Changchun China Bureau of Geology Mineral Resources of Shandong Province Jinan China Xu Wenliang* Yang Debin College of Earth Sciences Jilin University Changchun China Liu Changchun Bureau of Geology Mineral Resources of Shandong Province Jinan China Liu Xiaoming Hu Zhaochu Key Laboratory of Continental Dynamics Northwestern University Xi'an China 《中国地质大学学报(英文版)》2005,16(4)
TheeasternNorthChinacraton(NCC)isanat urallaboratoryforthestudyoftheformationandev olutionaryhistoryoftheMesozoiccontinentallitho sphereduetoitsparticulartectonicpositionandthe Mesozoicigneousrockswidelyoccurringonit(Wangetal.,2005;Gaoetal.,2004;Peietal.,2004;Xu etal.,2004a,b,c,2003a,b,2000,1999;Zhanget al.,2002;Griffinetal.,1998;MenziesandXu,1998).However,thehigh Mgdioritesinwestern Shandonghaveimportantimplicationsinthestudyof therelationshipbetweenMesozoicmagmatismand thenatureoftheli… 相似文献
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Chen Shanxiong* School of Civil Engineering Mechanics Huazhong University of Science Technology Wuhan China Institute of Rock Soil Mechanics Chinese Academy of Sciences Wuhan China Yu Song Liu Zhiguo Xu Haibin Institute of Rock Soil Mechanics Chinese Academy of Sciences Wuhan China 《中国地质大学学报(英文版)》2005,16(4)
INTRODUCTION Theinfiltrationandevaporationofwaterinasoil slopeareofparamountimportanceindetermining slopestability.Previousengineeringcasesandstud ieshaveshownthatrainwaterisoftenamajorfactor intheslopefailureofexpansivesoils.Expansivesoils intropicalandsubtropicalzonesareoftenunsaturat ed,andsoilslopesareinastablestateinnormalcli mateconditionsbecauseofthehighsuctionandshear strengthofthesoilmass.However,oncepermeation happensrainwaterwillinfiltrateintothesoilmasswhichleadstoanincreasein… 相似文献
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In the Gangdise area in the south of Qinghai-Tibet Plateau, a set of calc-alkalinevolcanics-granitic intrusives, which were resulted from subduction of neo-Tethys Ocean at YurlungZangbo oceanic plate beneath Lahsa block in Cretaceous-Palaeogene and subsequentarc-continental collision, were exposed, together with a set of shoshonitic volcanics and hypabyssalporphyries developed in the later stage (Bureau of Geology and Mineral Resources of TibetAutonomous Region, 1993; Li, 2002; Zhao et … 相似文献