| 四川松潘—甘孜盆地砂岩的物质来源:来自锆石U Pb（SHRIMP）年龄证据 |
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| 引用本文： | 兰中伍,陈岳龙,苏本勋,刘飞,张宏飞.四川松潘—甘孜盆地砂岩的物质来源:来自锆石U Pb（SHRIMP）年龄证据[J].沉积学报,2006,24(3):321-332. |
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| 作者姓名： | 兰中伍 陈岳龙 苏本勋 刘飞 张宏飞 |
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| 作者单位： | 中国地质大学地球科学与资源学院 北京 100083 |
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| 基金项目： | 国家自然科学基金(批准号:40234052)，教育部重点科研项目(重点03032)共同资助 |
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| 摘 要： | 松潘—甘孜复理石带（位于中国中部）呈巨大的三角形区域，面积2.0×105km2以上，其周围分别是华南板块、华北板块以及青藏高原大陆地块。从该带中部采集了六个砂岩样品，用U Pb法对其中的锆石逐个进行分析。碎屑锆石的有较大的年龄变化范围，其年龄主要集中在元古代，并且含少量的晚太古代（25～26亿年）物质，其它年龄反映从四堡期到三叠纪的印支期岩浆喷发事件。低U含量的锆石不协和性与铅丢失型式表明可能是由于后来岩浆喷发事件所致。加里东期锆石年龄峰值表明碎屑沉积物的源区可能来自北秦岭，其它的主要为扬子克拉通北缘、南秦岭。
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| 关 键 词： | 松潘—甘孜 碎屑沉积物 锆石U Pb法测年 源区 |
| 文章编号： | 1000-0550（2006）03-0321-12 |
| 收稿时间： | 2005-04-26 |
| 修稿时间： | 2005-08-18 |
The Origin of Sandstones from the Songpan-Ganze Basin, Sichuan, China: evidence from SHRIMP U-Pb dating of clastic zircons |
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| LAN Zhong-wu,CHEN Yue-long,SU Ben-xun,LIU Fei,ZHANG Hong-fei.The Origin of Sandstones from the Songpan-Ganze Basin, Sichuan, China: evidence from SHRIMP U-Pb dating of clastic zircons[J].Acta Sedimentologica Sinica,2006,24(3):321-332. |
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| Authors: | LAN Zhong-wu CHEN Yue-long SU Ben-xun LIU Fei ZHANG Hong-fei |
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| Institution: | College of Earth Sciences and Resources,Chinese University of Geosciences,Beijing 100083 |
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| Abstract: | The Songpan-Ganze basin(Central China) covers a huge triangular area of more than 200,000km~(2)and is bounded by the continental blocks of South China,North China and the Tibetan plateau.The six sandstone samples collected from this belt were analyzed grain-by-grainusing SHRIMP U-Pb method.The detrital zircons yield a wide range of ages,whichare focused on Proterozoic with minor contribution from late Archean material.The discordance and Pb loss patterns from low U zircons indicate that they might be resulted from the subsequent magmatism events,including the Sibao to the Indosinian periods.The Caledonian appearance of zircons indicates that the origin of these clastic sediments might originate from the Northern Qinling belt,other zircons originated mainly from the north margin of the Yangtze craton and the south Qinling belt. |
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| Keywords: | Songpan-Ganze clastic sediments U-Pb dating method on zircons origin |
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