云南省钼地球化学特征及找矿方向探讨

Molybdenum Geochemical Characteristics in Yunnan Province and a Discussion on Its Prospection

钼元素多以低价硫化物形式存在,在强氧化条件下也形成高价态离子或络合物,"分散富存"于中—基性岩、酸性岩或被铁锰氧化物、有机质吸附而赋存于黑色岩系、第四系高铁、锰风化物中。在高卤的汽液环境下比较稳定而易分离、迁移、富集,形成岩浆汽液多金属矿床。云南省钼高背景、异常分布于基性火山岩出露区、杂岩带及黑色岩系、含铁(锰)风化物分布区。找矿以侵入岩体型为主,对热液型、沉积型进行研究和探讨。

The element molybdenum(Mo) always occurs in low valence sulfides,but forms high valence ions or complexes in intensely oxidizing environments,scatteredly concentrating in medium-basic igneous rocks and acidic magmatic rocks,or being adsorbed by Fe-Mn oxides and organics in black rocks and Quaternary Fe-Mn-rich weathering products.While in gas-liquid environments rich in halogens,it tends to separate,migrate and gather,and forms magmatic hydrothermal polymetallic ore deposits.Yunnan shows high molybdenum background and the Mo anomalies usually distribute in basic eruptives,complex zones,black rocks and Fe-Mn weathering materials.Therefore,skarn and porphyry Mo mineralization should be the preferred targets for molybdenum prospection.And hydrothermal and sedimentary types of* Mo mineralization still need more studies.