| 秦岭佛坪变质结晶岩系年龄和物质组成特征——SHRIMP锆英石U-Pb年代学和全岩Sm-Nd年代学数据 |
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| 引用本文： | 张宗清,宋,彪,唐索寒,张寿广,杨永成,王进辉.秦岭佛坪变质结晶岩系年龄和物质组成特征——SHRIMP锆英石U-Pb年代学和全岩Sm-Nd年代学数据[J].中国地质,2004,31(2):161-168. |
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| 作者姓名： | 张宗清 宋 彪 唐索寒 张寿广 杨永成 王进辉 |
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| 作者单位： | 1. 中国地质科学院地质研究所,北京,100037
2. 陕西省地勘局区调研究院,陕西,咸阳,712000 |
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| 基金项目： | 国家自然科学基金项目(40072071);中国地质调查局地质大调查项目(200313000057)资助. |
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| 摘 要： | 秦岭是长期多阶段发展的复杂大陆碰撞造山带。本文报道了位于造山带中部佛坪变质结晶杂岩系的SHRIMP锆英石U-Pb年龄和全岩Sm-Nd年龄同位素分析结果。变质岩SHRIMP锆英石U-Pb年龄十分复杂，除有少量太古宇形成的锆英石外，还存在大量元古宇至显生宇的锆英石。并在2000Ma，1200Ma，800Ma，400Ma，200Ma左右形成峰期。片麻岩Nd模式年龄tDM 1372～2081Ma。佛坪变质结晶岩系主体可能形成于古元古代，年龄2000Ma左右。在后期强烈地质作用中有少量地幔物质加入。岩系形成于新太古代的意见笔者没有得到证实。秦岭造山带中部可能存在或存在过太古宙结晶基底岩石。
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| 关 键 词： | 秦岭 大陆碰撞造山带 变质结晶岩系 年龄 SHRIMP锆英石U-Pb年龄 全岩Sm-Nd年代学 同位素年代学 |
| 文章编号： | 1000-3657(2004)02-0161-08 |
Age and material composition of the Foping metamorphic crystalline complex in the Qinling Mountains:SHRIMP zircon U-Pb and whole-rock Sm-Nd geochronology |
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| ZHANG Zongqing,SONG Biao,TANG Suohan,ZHANG Shouguang,YANG Yongcheng,WANG Jinhui.Age and material composition of the Foping metamorphic crystalline complex in the Qinling Mountains:SHRIMP zircon U-Pb and whole-rock Sm-Nd geochronology[J].Chinese Geology,2004,31(2):161-168. |
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| Authors: | ZHANG Zongqing SONG Biao TANG Suohan ZHANG Shouguang YANG Yongcheng WANG Jinhui |
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| Institution: | ZHANG Zongqing1,SONG Biao1,TANG Suohan1,ZHANG Shouguang1,YANG Yongcheng2,WANG Jinhui1 |
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| Abstract: | The Qinling is a complex continental collisional orogenic belt resulting from long-continued, multi-stage development. This paper reports the results of isotopic analyses of the SHRIMP zircon U-Pb ages and whole-rock Sm-Nd ages for the Foping metamorphic crystalline complex in the central part of the orogenic belt. The SHRIMP zircon U-Pb ages are very complex; except for small amount of Archean zircon, there are also significant amounts of Proterozoic to Phanerozoic zircon.The metamorphic peaks occurred at -1 200, 800, 400 and 200 Ma. Gneiss has a Nd model age tDM of 1 372-208 Ma. The main part of the Foping metamorphic crystalline rock series possibly formed in the Paleoproterozoic, with an age of -2 000 Ma. In the subsequent strong geological processes, a small amount of mantle material was introduced. The view of the formation of the rock series in the Neo-archean has not been verified by the authors. Archean crystalline basement rocks may occur or may have occurred in the central part of the Qinling orogenic belt. |
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| Keywords: | Foping metamorphic crystalline complex isotope chronology Qinling orogenic belt |
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