| 中国若干钨矿床相平衡关系 |
| |
| 引用本文： | 林传仙 D.M.Burt 张哲儒.中国若干钨矿床相平衡关系[J].地球化学,1984(1):22-30. |
| |
| 作者姓名： | 林传仙 D.M.Burt 张哲儒 |
| |
| 作者单位： | [1]不详 [2]美国亚利桑那州立大学地质系 |
| |
| 摘 要： | This paper reviews the features of several tungsten ore deposits in southern China, including the Shezhuyuan, Yaogangxian, Xihuashan, Danping, Yiatang and Dajishan mines. The authors think that the formation depth of greisen-type deposits is intermediate between the depths of pegmatite- and porphyry- type deposits. Using phase diagrams of the model system K2O-AhO3-SiO2-H2O-HF, the formation mechanism of greisens has been argued. The variation of mineral assemblages from K-feldspar, muscovite to topaz reflects a gradual increase in acidity. This variation can be used as a criterion to appreciate the depth of mineralization. Equilibria of tungsten minerals in greisen and skarn deposits can be depicted on chemical potential diagrams of the model system CaO-FeO-WO3-CO2-F2O-1. The assemblage wolframite fluorite is shown to have been transformed to scheelite magnetite with decreasing μHP. Depending on CO2 activity in the fluids, there are two distinct phase diagrams.One shows that wolframite is incompatible with calcite, and the other demonstrates that scheelite is incompatible with rhodochrosite. On the phase diagrams of the model system FeO-MnO-WO3-F2S-1, huebnerite is transformed to ferberite with increasing μP1O-1orμF2S-1,During the replacement of wolframite by scheelite, the wolframite residue must have been enriched in Mn.
|
| 关 键 词： | 钨矿 地质产状 成矿条件 中国 相平衡 |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
