| 岩背和塌山含锡花岗斑岩的同位素地球化学特征和物质来源 |
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| 引用本文：沈渭洲,凌洪飞.1994.岩背和塌山含锡花岗斑岩的同位素地球化学特征和物质来源[J].地球学报,15(1,2):117-123. |
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| 中文摘要:笔者选择了岩背和塌山两个含锡花岗斑岩进行了系统的同位素地球化学研究。岩背花岗斑岩的全岩Ｒｂ－Ｓｒ等时线年龄（１１４Ｍａ）和塌山花岗斑岩单颗粒锗石Ｕ－Ｐｂ年龄（１３８Ｍａ）表明，这两个含锡花岗斑岩都是燕山晚期岩浆活动的产物。这些岩石具有较低的ε＿Ｎｄ值，较高的（￣（８７）Ｓｒ／￣（８６）Ｓｒ）ｉ值、￣（２０７）Ｐｂ／￣（２０４）Ｐｂ值和δ￣（１８）Ｏ值以及较古老的Ｎｄ模式年龄。同时，它们明显富集ＳｉＯ＿２、Ｋ＿２Ｏ、Ｒｂ、Ｆ和Ｓｎ，并具有强的负Ｅｕ异常和弱的Ｃｅ负异常。这些特征都相似于华南陆壳改造系列花岗岩 |
| 中文关键词:含锡花岗斑岩，同位素，岩背，塌山 |
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| ISOTOPIC GEOCHEMICAL CHARACTERISTICS AND MATERIAL SOURCES OF TIN-BARING GRANITE PORPHYRY IN YANBEI AND TASHAN |
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| Abstract:Whole-rock Rb-Sr isochron age of 114 Ma in Yanbei granite porphyry and single grained zirconU-Pb age of 138 Ma in Tashan granite porphyry indicate that these two tin-bearing porphm beth arethe products of Late Yenshan magmatic activity. These rocks have relatively low εNd, high￣87Sr/￣86Sr1,￣207Pb/￣204Pb and δ￣(18)O and old Nd model ages,Mean while,they are also clearly rich inSiO2,K2O,Rb,F and Sn and posses intensive Eu and weak Ce negative anomalies.All of these charac-teristica are similar to those of continental crust transformation series granite in South Chma,implyingthat their parent magma may be derived from the unexposed Proterozoic metasedimentary rocks. |
| keywords:tin-bearing porphyry isotope Yanbei Tashan |
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