摘要
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。
The Pb isotope analysis on molybdenite and pyrite in Antuoling porphyry molybdenum deposit was conducted. The ratios of ^206Pb/^204Pb,^207Pb/^204Pb and ^208Pb/^204Pb in two molybdenite samples are 17. 246 and 17. 822, 15. 396 and 15. 495, 37. 409 and 37. 239, respectively. The ratios of ^206Pb/^204Pb in two pyrite sam- ples are 16. 519 and 16. 366;^207Pb/^204 Pb ratio and ^208Pb/^204 Pb ratio are 15. 251 and 15. 229, 36. 571 and 36. 410, respectively. In ^205Pb/^204Pb-^207Pb/^204Pb diagram, points of pyrite samples from Antuoling porphyry molybdenum deposit are close to Pb evolutionary trend line of lower crust, and points of molybdenite sam- ples are close to Pb evolutionary trend line of upper mantle. In A^-A7 of Pb isotopes diagram, data points of samples from Antuoling porphyry molybdenite deposit locate in mantle source area and orogeny source area. The features of Pb isotope tracing of Antuoling porphyry molybdenite deposit suggest that tectonic move- ment in metallogenic epoch has affected lower crust and upper mantle, and it is consistent with the deep dy- namic process delamination in Antuoling lithosphere. Antuoling porphyry molybdenum deposit is controlled by intraplate orogenic movement of Taihang mountain, and its formation is irrelevant with subduction of Pa- cific plate.
出处
《矿产与地质》
2013年第1期83-88,共6页
Mineral Resources and Geology
基金
天津华北地质勘查总院科研项目(KY2008-2)
中国地质调查局地质调查项目(1212011220921)
河南省国土资源厅科技攻关项目(2011-622-25和2011-622-36)
河南省有色金属地质矿产局科研项目(YSDK2012-03)
关键词
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
porphyry molybdenum deposit, pb isotope, lithosphere delamination, transmagmatic fluids,Antuoling, Taihang mountain
