發(fā)布時間：2018-06-11 12:17

  本文選題：地球化學特征 + 碳、氧同位素��； 參考：《現(xiàn)代地質》2017年04期

【摘要】：貴州紫云方解石礦床是在貴州西南部新發(fā)現(xiàn)的非金屬礦床,方解石礦體呈脈狀、透鏡狀和似層狀產出。對紫云火山關、達則等方解石礦床開展同位素地球化學及微量元素、稀土元素研究,結果表明碳、氧同位素顯示成礦物質來源于海相碳酸鹽巖,成礦流體以富含HCO_3~-為主,大氣水參與成礦,與巖漿作用關系不大。其中達則礦段相對于圍巖,成礦物質具有較高的Sr、Zn和Ni含量,稀土元素配分曲線明顯區(qū)別于圍巖,δEu顯示正異常等特征,暗示可能有深部流體參與成礦�；鹕疥P、打勞等其他礦段,礦體和圍巖具有相似的稀土配分模式和∑REE變化規(guī)律,表明成礦物質來源于碳酸鹽巖圍巖。通過區(qū)域成礦作用比較,認為成礦時代可能屬于印支—燕山期。
[Abstract]:Ziyun calcite deposit is a newly discovered nonmetallic deposit in southwestern Guizhou. The calcite orebody is vein-like, lenticular and stratiform. The isotopic geochemistry, trace elements and rare earth elements of calcite deposits such as Ziyun volcano and Daze are studied. The results show that the carbon and oxygen isotopes are derived from marine carbonate rocks, and the ore-forming fluids are mainly rich in HCO _ 3-. Atmospheric water is involved in mineralization and has little to do with magmatism. Compared with the surrounding rock, the ore-forming material in the Dazi section has a higher content of Sr-Zn and Ni, the distribution curve of rare earth elements is obviously different from the surrounding rock, and 未 EU shows positive anomalies, suggesting that deep fluids may be involved in the mineralization. The orebody and surrounding rock have similar REE distribution model and 鈭，

本文編號：2005218