| 长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征 |
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| 关键词:Cu-bearing rock Pb Sf and Nd isotopic compositions middle-low YantzeDepartment of Earth and Space Science Univctsity of Science and Technology of China HefeiAnhui Instetute of Geologr Hefei |
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| Pb,Sr,AND Nd ISOTOPE CHARACTERISTICS OF COPPER-BEARING ROCKS FROM MIDDLE─LOW AREA OF YANTZE |
| Mesozoic intrusions which have close genetic relations with Cu, Fe,Au,and S deposits were widely distributed along the area of middle-low Yantze from east of Wuhang to Zhengjiang.They have the average are of 136±1Ma, and could be divided to two series:one is copper-containing dior-ites and another iron-containing basic to sialic rocks,The Pb,Sr,and Nd isotopic compositions indi-cate that the Cu-bearing rocks were the crystllization products of athenospheric derived alkalic magma with assimilation of old crustal materials,The alkalic magma characterized by its low Si and high alka-li,high ε_Nd(t),low ￣(87)Sr/￣(86)Sr and high Sr concentrations imply their derivation from depleted mantlesource. The iseotopic constraints demand the assimilation species were very old wall rocks probablly old-er than Archean Daibein fomation.The occurence of Cu and Fe ore deposits with close relation to in-trusion in space and time indicates that the primary alkalic basaltic magma would be the main carrier of ore materials. |
| CHEN Jiang-feng,ZHOU Tai-xi,XING Feng-ming,XU Xiang,XU Li-hua.1994.Pb,Sr,AND Nd ISOTOPE CHARACTERISTICS OF COPPER-BEARING ROCKS FROM MIDDLE─LOW AREA OF YANTZE[J].Acta Geoscientica Sinica,15(1,2):111-116. |
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