| 长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征 |
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| 引用本文：陈江峰,周泰禧,邢凤鸣,徐祥,徐立华.1994.长江中下游岩带含铜岩体的Pb、Sr、Nd同位素特征[J].地球学报,15(1,2):111-116. |
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| 中文摘要:长江中下游铜、铁、金、硫成矿带，以矽卡岩型铜矿和潜火山岩型铁矿的密集分布而举世瞩目，这些矿床的形成与燕山期岩浆岩密切相关，本课题研究含矿岩体同位素地球化学特征，含铜岩体是来自地幔软流圈的碱性岩浆同化古老地壳物质同时结晶分异的产物。另外本文还讨论其物质来源和成因，铜铁矿床与侵入体的时空关系表明原始碱性玄武岩浆可能是成矿物质的主要携带者。 |
| 中文关键词:含铜岩体，Pb、Sr、Nd同位素组成，长江中下游地区 |
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| Pb,Sr,AND Nd ISOTOPE CHARACTERISTICS OF COPPER-BEARING ROCKS FROM MIDDLE─LOW AREA OF YANTZE |
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| Abstract: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. |
| keywords: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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