| 苏鲁超高压造山带南部海州群锆石年龄及其地质意义 |
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| 引用本文： | 王秀丽,李向辉,陈福坤,李秋立,郭敬辉.苏鲁超高压造山带南部海州群锆石年龄及其地质意义[J].高校地质学报,2006,12(3):365-374. |
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| 作者姓名： | 王秀丽 李向辉 陈福坤 李秋立 郭敬辉 |
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| 作者单位： | 中国科学院,地质与地球物理研究所,固体同位素地球化学实验室,北京,100029;中国科学院,地质与地球物理研究所,固体同位素地球化学实验室,北京,100029;中国科学院,研究生院,地球科学学院,北京,100039;中国科学院,地质与地球物理研究所,固体同位素地球化学实验室,北京,100029;中国科学院,地质与地球物理研究所岩石圈演化国家重点实验室,北京,100029;中国科学院,地质与地球物理研究所岩石圈演化国家重点实验室,北京,100029 |
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| 基金项目： | 国家自然科学基金(40525007)，国家重点基础研究发展规划项目(G1999075502)资助 |
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| 摘 要： | 厘定大别-苏鲁超高压造山带南缘变质岩带的形成时代和地球化学特征有助于区域地层对比研究和对这一造山带演化过程的深入理解。采用单颗粒锆石U—Pb同位素稀释法和蒸发法定年，获得来自苏鲁地体南部海州群上部云台组的3个云母石英片岩样品的碎屑锆石年龄，且集中于800～740Ma之间。全岩初始εNd（800Ma）值变化在-12．8～-8．8之间，两阶段亏损地幔Nd模式年龄为2．1～2．4Ga。这些特征类似于大别山南部宿松地区副片麻岩，指示较单一的沉积物源。结合区域地层对比资料，碎屑锆石年龄限定了海州群云台组的沉积时代可能为新元古代，晚于740Ma左右。其主要沉积物质源自新元古代岩浆岩，归属于扬子陆块
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| 关 键 词： | 大别-苏鲁造山带 低级变质岩带 海州群 锆石年龄 新元古代 |
| 文章编号： | 1006-7493（2006）03-0365-10 |
| 收稿时间： | 2006-03-30 |
| 修稿时间： | 2006-07-20 |
Zircon Ages of the Haizhou Group in the Southern Part of the Sulu Ultrahigh Pressure Orogenic Belt and Geological Significances |
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| WANG Xiu-li,LI Xiang-hui,CHEN Fu-kun,LI Qiu-li,GUO Jing-hui.Zircon Ages of the Haizhou Group in the Southern Part of the Sulu Ultrahigh Pressure Orogenic Belt and Geological Significances[J].Geological Journal of China Universities,2006,12(3):365-374. |
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| Authors: | WANG Xiu-li LI Xiang-hui CHEN Fu-kun LI Qiu-li GUO Jing-hui |
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| Institution: | 1. Laboratory for Radiogenic Isotope Geochemistry, Institute of Geology and Geophysics, Chinese Academy of Sc/enees, Belting 100029 |
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| Abstract: | Constraints of age and isotopic compositions on the metamorphic rock units exposed in the southern part of the Dabie-Sulu ultrahigh pressure orogenic belt are essential for the study of regional stratigraphic comparison and further for understanding tectonic process and evolution of this orogen. In this study, Nd isotopic compositions and ages of detrital zircon of schists from the Haizhou Group in the southern part of the Sulu terrain are presented. Detrital zircon gains of three schist samples collected from the Yuntai Formation of the upper Haizhou Group yielded ages clustering around 740 to 800 Ma. Initial εnd （800 Ma） values and two-stage depleted-mantle Nd modal ages of the schist samples range from - 12.8 to - 8.8 and from 2.1 to 2.4 Ga. These ages and isotopic characteristics of the Yuntai schists are similar to those of paragneisses exposed in the Susong area of the Dabie Mountains and indicate a relatively single sedimentary source. Combined with a regional stratigraphic comparison, ages of the detrital zircons can place a constraint of Neoproerozoic age, later than about 740 Ma, for the deposition time of the Yuntai Formation. The sedimentary material was likely originated from Neoproterozoic magmatic rocks having an affinity of the Yangtze block. |
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| Keywords: | Dabie-Sulu low-grade metamorphic zone Haizhou Group Zircon age Neoproterozoic |
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