岩矿测试
巖礦測試
암광측시
ROCK AND MINERAL ANALYSIS
2015年
4期
494-502
,共9页
万浩章%刘战庆%刘善宝%陈毓川%王成辉%陈国华%梁力杰%李赛赛%张树德%刘小林
萬浩章%劉戰慶%劉善寶%陳毓川%王成輝%陳國華%樑力傑%李賽賽%張樹德%劉小林
만호장%류전경%류선보%진육천%왕성휘%진국화%량력걸%리새새%장수덕%류소림
朱溪铜钨矿%花岗闪长斑岩%铜矿化%激光剥蚀电感耦合等离子体质谱法%锆石U-Pb定年
硃溪銅鎢礦%花崗閃長斑巖%銅礦化%激光剝蝕電感耦閤等離子體質譜法%鋯石U-Pb定年
주계동오광%화강섬장반암%동광화%격광박식전감우합등리자체질보법%고석U-Pb정년
Zhuxi copper-tungsten mine%granodiorite porphyry%copper mineralization%Laser Ablation Inductively Coupled Plasma-Mass Spectrometry%zircon U-Pb dating
赣东北朱溪超大型铜钨矿位于江南古岛弧带塔前—赋春成矿带中段，该矿床的发现可进一步验证“南钨北扩”观点并对“南钨北铜”格局提出挑战，但前人对与朱溪铜钨矿成矿作用有关的花岗岩缺少精确的年代学研究，导致对其地球动力学背景理解不够深入。本研究通过详细的野外调查、岩心编录和岩矿鉴定，并利用激光剥蚀电感耦合等离子体质谱（ LA-ICP-MS）锆石U-Pb法对朱溪铜钨矿区侵入元古代双桥山岩群中的铜矿化花岗闪长斑岩进行测年，获得了锆石206 Pb/238 U加权平均年龄为847.2±9.4 Ma（ MSWD＝0.111），代表了其侵位结晶的年龄，属新元古代。分析认为：朱溪铜钨矿区铜矿化花岗闪长斑岩是新元古代早期华南古洋壳俯冲消减及扬子陆块与华夏陆块发生碰撞作用下的岩浆产物，这次岩浆活动与区域上塔前—赋春成矿带成矿作用关系密切，并为钦—杭成矿带提供了成矿物质基础。本次对其成岩年龄的限定，为研究朱溪超大型铜钨矿矿床提供了新证据。
贛東北硃溪超大型銅鎢礦位于江南古島弧帶塔前—賦春成礦帶中段，該礦床的髮現可進一步驗證“南鎢北擴”觀點併對“南鎢北銅”格跼提齣挑戰，但前人對與硃溪銅鎢礦成礦作用有關的花崗巖缺少精確的年代學研究，導緻對其地毬動力學揹景理解不夠深入。本研究通過詳細的野外調查、巖心編錄和巖礦鑒定，併利用激光剝蝕電感耦閤等離子體質譜（ LA-ICP-MS）鋯石U-Pb法對硃溪銅鎢礦區侵入元古代雙橋山巖群中的銅礦化花崗閃長斑巖進行測年，穫得瞭鋯石206 Pb/238 U加權平均年齡為847.2±9.4 Ma（ MSWD＝0.111），代錶瞭其侵位結晶的年齡，屬新元古代。分析認為：硃溪銅鎢礦區銅礦化花崗閃長斑巖是新元古代早期華南古洋殼俯遲消減及颺子陸塊與華夏陸塊髮生踫撞作用下的巖漿產物，這次巖漿活動與區域上塔前—賦春成礦帶成礦作用關繫密切，併為欽—杭成礦帶提供瞭成礦物質基礎。本次對其成巖年齡的限定，為研究硃溪超大型銅鎢礦礦床提供瞭新證據。
공동북주계초대형동오광위우강남고도호대탑전—부춘성광대중단，해광상적발현가진일보험증“남오북확”관점병대“남오북동”격국제출도전，단전인대여주계동오광성광작용유관적화강암결소정학적년대학연구，도치대기지구동역학배경리해불구심입。본연구통과상세적야외조사、암심편록화암광감정，병이용격광박식전감우합등리자체질보（ LA-ICP-MS）고석U-Pb법대주계동오광구침입원고대쌍교산암군중적동광화화강섬장반암진행측년，획득료고석206 Pb/238 U가권평균년령위847.2±9.4 Ma（ MSWD＝0.111），대표료기침위결정적년령，속신원고대。분석인위：주계동오광구동광화화강섬장반암시신원고대조기화남고양각부충소감급양자륙괴여화하륙괴발생팽당작용하적암장산물，저차암장활동여구역상탑전—부춘성광대성광작용관계밀절，병위흠—항성광대제공료성광물질기출。본차대기성암년령적한정，위연구주계초대형동오광광상제공료신증거。
The Zhuxi ultra-large type copper-tungsten deposit in the Hortheast Jiangxi province located in Taqian -Fuchun metallogenic belt which belongs to Jiangnan ancient island-arc,the discovery of the deposit has verified Southern Tungsten Horth Expansion perspective and challenge the viewpoint that Tungsten located in the south but the copper located in the north of Jiangxi provience,but the previous lack of accurate chronology study related to Zhuxi copper-tungsten mineralization of granite not enough, resulting in the geodynamic background of understanding. In this study,on the basis of detailed field investigation,core logging and petrology studies on the granodioritic porphyries which had intruded into the Middle Proterozoic Shuangqiaoshan group and with copper mineralization alteration,using laser ablation inductively coupled plasma mass spectrometry( LA-ICP-MS)zircon U-Pb dating,we obtained the granodioritic porphyries zircon 206 Pb/ 238 U weighted mean age of 847. 2 ± 9. 4 Ma (MSWD=0. 111),which can represent the granodiorite porphyry magma emplacement and crystallization age, belonging to the neoproterozoic. The results reveal that the granodioritic porphyries of Zhuxi copper-tungsten mine is a product of the early Heoproterozoic Southern China ancient oceanic crust subduction and Yangtze and Cathaysian continental blocks collisional magmatism,the magmatic activity provides the basis for the metallogenic Qinzhou-Hangzhou metallogenic belt,and the magma event is close related to the Taqian-Fuchun ore belt mineralization,it also provides new evidence for the study of Zhuxi ultra-large type copper-tungsten deposit.
