矿产与地质
礦產與地質
광산여지질
MINERAL RESOURCES AND GEOLOGY
2013年
1期
83-88
,共6页
卢仁%梁涛%罗照华%樊秉鸿
盧仁%樑濤%囉照華%樊秉鴻
로인%량도%라조화%번병홍
斑岩型钼矿床%Pb同位素%岩石圈拆沉%透岩浆流体%安妥岭%太行山
斑巖型鉬礦床%Pb同位素%巖石圈拆沉%透巖漿流體%安妥嶺%太行山
반암형목광상%Pb동위소%암석권탁침%투암장류체%안타령%태행산
porphyry molybdenum deposit%pb isotope%lithosphere delamination%transmagmatic fluids%Antuoling%Taihang mountain
对安妥岭斑岩钼矿床矿石中辉钼矿和黄铁矿进行了Pb同位素分析。安妥岭黄铁矿样品投点位于下地壳铅演化趋势线附近,辉钼矿样品投点位于上地幔铅演化趋势线附近;在Pb同位素Δβ-Δγ图解中,安妥岭样品数据点位于地幔源区和造山作用源区。这些Pb同位素特征表明安妥岭斑岩钼矿的成矿物质来源于上地幔-下地壳。同时,安妥岭斑岩钼Pb同位素示踪揭示了成矿期的构造运动波及到上地幔-下地壳,与安妥岭岩石圈拆沉作用这一深部动力学过程相吻合,安妥岭斑岩钼矿受控于太行山板内造山过程,其形成与太平洋板块的俯冲作用无关。
對安妥嶺斑巖鉬礦床礦石中輝鉬礦和黃鐵礦進行瞭Pb同位素分析。安妥嶺黃鐵礦樣品投點位于下地殼鉛縯化趨勢線附近,輝鉬礦樣品投點位于上地幔鉛縯化趨勢線附近;在Pb同位素Δβ-Δγ圖解中,安妥嶺樣品數據點位于地幔源區和造山作用源區。這些Pb同位素特徵錶明安妥嶺斑巖鉬礦的成礦物質來源于上地幔-下地殼。同時,安妥嶺斑巖鉬Pb同位素示蹤揭示瞭成礦期的構造運動波及到上地幔-下地殼,與安妥嶺巖石圈拆沉作用這一深部動力學過程相吻閤,安妥嶺斑巖鉬礦受控于太行山闆內造山過程,其形成與太平洋闆塊的俯遲作用無關。
대안타령반암목광상광석중휘목광화황철광진행료Pb동위소분석。안타령황철광양품투점위우하지각연연화추세선부근,휘목광양품투점위우상지만연연화추세선부근;재Pb동위소Δβ-Δγ도해중,안타령양품수거점위우지만원구화조산작용원구。저사Pb동위소특정표명안타령반암목광적성광물질래원우상지만-하지각。동시,안타령반암목Pb동위소시종게시료성광기적구조운동파급도상지만-하지각,여안타령암석권탁침작용저일심부동역학과정상문합,안타령반암목광수공우태행산판내조산과정,기형성여태평양판괴적부충작용무관。
The Pb isotope analysis on molybdenite and pyrite in Antuoling porphyry molybdenum deposit was conduc-ted. The ratios of 206 Pb/ 204 Pb,207 Pb/ 204 Pb and 208 Pb/ 204 Pb in two molybdenite samples are 17. 246 and 17. 822, 15. 396 and 15. 495, 37. 409 and 37. 239, respectively. The ratios of 206 Pb/ 204 Pb in two pyrite samples are 16. 519 and 16. 366; 207 Pb/ 204 Pb ratio and 208 Pb/ 204 Pb ratio are 15. 251 and 15. 229, 36. 571 and 36. 410, respectively. In 206 Pb/ 204 Pb-207 Pb/ 204 Pb diagram, points of pyrite samples from Antuoling porphyry molybdenum deposit are close to Pb evolutionary trend line of lower crust, and points of molybdenite samples are close to Pb evolutionary trend line of up-per mantle. InΔβ-Δγof Pb isotopes diagram, data points of samples from Antuoling porphyry molybdenite deposit lo-cate in mantle source area and orogeny source area. The features of Pb isotope tracing of Antuoling porphyry molybde-nite deposit suggest that tectonic movement in metallogenic epoch has affected lower crust and upper mantle, and it is consistent with the deep dynamic process delamination in Antuoling lithosphere. Antuoling porphyry molybdenum de-posit is controlled by intraplate orogenic movement of Taihang mountain, and its formation is irrelevant with subduc-tion of Pacific plate.