山西中条山胡篦型铜矿床岩石地球化学特征

对山西中条山胡篦型铜矿矿区容矿岩石的常量、稀土元素以及C、O 同位素进行了测试分析。常量元素特征显示，容矿岩石具有富Si、富Al、贫K 的特征。其中，硅质钠长岩明显富Na，大理岩一般贫Na。稀土元素特征显示，容矿岩石ΣREE 值总体很低，相对富集轻稀土，具有Eu 负异常，Ce 异常不明显的特点，LaN /YbN = 1. 70 ～ 5. 21，LaN /SmN = 0. 85 ～ 3. 8，GdN /YbN = 0. 72 ～ 3. 26。C、O 同位素研究显示，δ13 CPDB值集中在－ 4. 3 × 10 － 3 ～ － 0. 2 × 10 － 3，介于海相碳酸盐岩( 近于0) 和岩浆岩 ( － 5 × 10 － 3 ～ － 8 × 10 － 3 ) 的δ13 CPDB值之间，δ18 OPDB值集中在－ 13 × 10 － 3 ～ － 18 × 10 － 3。研究认为胡篦型铜矿床与国内外典型的热水喷流矿床在岩石地球化学方面有很多相似之处，具有热水喷流矿床的特征。碳氧同位素研究显示，成矿流体中的C 主要来自地幔和海相碳酸盐岩( 海水) ，可能有岩浆C 的加入。

Petrology and geochemistry characteristic of Hu-Bi copper deposit in Zhongtiao mountains of Shanxi Province

We tested and analyzed the major elements，rare earth elements and carbon and oxygen isotopic of the wall rock alteration in the Hu-Bi copper deposit of Shanxi Zhongtiao mountains． Major element feature shows that host rocks are rich in Si and Al，but poor in K; siliceous albitite is obviously rich in Na; marble is poor in Na． REE characteristics show that the ΣREE value in host rocks is very low generally，relatively enriched in light REE，and characteristic in negative Eu anomaly，not obvious in Ce anomaly，LaN /YbN = 1. 70 ～ 5. 21，LaN /SmN = 0. 85 ～ 3. 8，and GdN /YbN = 0. 72 ～ 3. 26． Carbon and oxygen isotopic research indicates that δ13 CPDB concentrats in － 4. 3 × 10 － 3 ～ － 0. 2 × 10 － 3 between marine carbonate rocks ( 0) and igneous rocks ( － 5 × 10 － 3 ～ － 8 × 10 － 3 ) ，δ18 OPDB concentrats in － 13 × 10 － 3 ～ － 18 × 10 － 3 ． The study suggests that the Hu-Bi copper deposit has the features of the exhalative sedimentary deposit because there are many similarities between the Hu-Bi copper deposit and other typical exhalative sedimentary deposits in geochemistry． Carbon and oxygen isotopic research shows that C in ore-forming fluids coming from the mantle and marine carbonate rock ( seawater) may have magmatic C added．