In-Situ U-Pb Dating and Hf Isotopic Analyses of Zircons from Volcanic Rocks of the Houcheng and Zhangjiakou Formations in the Zhang-Xuan Area, Northeast China
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摘要: 冀北张家口-宣化地区(张-宣地区)分布着中生代后城组和张家口组火山岩.锆石的LA-ICPMS U-Pb年龄和LA-MC-ICPMS Hf同位素分析结果表明, 后城组英安岩的结晶年龄为(130±1)Ma, 为早白垩世, 而不是前人所认为的晚侏罗世.张家口组流纹岩的结晶年龄为(126±1)Ma, 也为早白垩世.后城组英安岩中锆石Hf同位素组成为εHf(t)=-18.8~-25.5, Hf平均地壳模式年龄为TDMC=2.78~2.37 Ga, 平均2.54 Ga, 与冀北分布的基底岩石Nd、Hf模式年龄相同, 考虑到华北克拉通东部地壳生长的主要时期为晚太古代, 我们初步认为后城组粗安岩可能主要来源于晚太古代地壳物质的重熔作用; 而张家口组流纹岩中锆石Hf同位素组成为εHf(t)=-15.1~-18.5, Hf平均地壳模式年龄为TDMC=2.34~2.13 Ga, 明显比后城组火山岩年轻.张家口火山岩来源于太古代的地壳物质和部分幔源物质混合.这些年代学数据和锆石Hf同位素表明张-宣地区大面积的后城组和张家口组火山岩是华北克拉通东部晚中生代岩石圈强烈减薄作用的结果.Abstract: Large-scale volcanic rocks of the Houcheng and Zhangjiakou formations are developed in the Zhangjiakou-Xuanhua (Zhang-Xuan) area. Zircon LA-ICPMS U-Pb dating gives the eruption age of dacite in the Houcheng Formation as (130±1) Ma, indicating that the Houcheng Formation formed during the Early Cretaceous, not during the Late Jurassic as previously thought. Volcanic rocks of the Zhangjiakou Formation have a zircon LA-ICPMS U-Pb age of (126±1)Ma, i. e., Early Cretaceous. In-situ zircon Hf analyses show that zircons from the Houcheng Formation dacite have εHf(t) values of -18. 8 to - 25. 5 and Hf crustal model ages of 2. 78 to 2. 37 Ga with an average of 2. 54 Ga. Their model ages are similar to those of basement rocks in the northern North China craton, representing an important stage of crustal growth in the North China craton. Thus, we suggest that the dacite was mainly derived from the partial melting of Late Archean crustal materials. Whereas, zircons from the rhyolite of the Zhangjiakou Formation have εHf(t) values of -15. 1 to -18. 5 and younger Hf crustal model ages of 2. 34 to 2. 13 Ga, indicating that the rhyolite was derived from Late Archean crustal materials, but with the involvement of mantle materials. The age and Hf isotopic data suggest that the large-scale volcanic rocks in the Zhang-Xuan area were the result of crust-mantle interaction during the Early Cretaceous lithospheric thinning in the eastern North China cratoa.
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图 1 张—宣地区大地构造位置(a)及其研究区地质简图、采样位置(b)
Fig. 1. Tectonic map (a) and simplified geological map and sample locations (b) of the Zhang-Xuan area
图 2 后城组和张家口组火山岩中锆石CL图像
圆圈及其中的数字代表分析点教点号，线比例尺长度为50μm
Fig. 2. CL images of zircons from volcanic rocks of the Houcheng and Zhangjiakou formations.Circles and numbers represent analyzed spots and spot num-bers.The line scales are ~50μm
图 3 后城组和张家口组火山岩中锆石的U-Pb年龄
Fig. 3. Zircon U-Pb ages of volcanic rocks from the Houcheng and Zhangjiakou formations
图 4 后城组和张家口组火山岩中锆石的Hf同位素组成
Fig. 4. Zircon Hf isotopic data of volcanic rocks from the Houcheng and Zhangiiakou formations
图 5 后城组和张家口组火山岩中锆石Hf同位素特征
前寒武纪岩石中锆石的Hf同位素引自杨进辉未发表数据
Fig. 5. Zircon Hf isotopic features of volcanic rocks from the Houcheng and Zhangjiakou formations
表 1 张-宣地区后城组和张家口组火山岩锆石U-Pb年龄
Table 1. U-Pb data of volcanic rocks from the Houcheng and Zhangjiakou formations in the Zhang-Xuan area
表 2 后城组和张家口组火山岩锆石Hf同位素组成
Table 2. Zircon Hf isotopic data of volcanic rocks from the Houcheng and Zhangjiakou formations
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Anderson, T., 2002. Correction of common lead in U-Pb analyses that do not report 204Pb. Chemical Geology, 192: 59-79. doi: 10.1016/S0009-2541(02)00195-X Bichert-Toft, J., Albarede, F., 1997. The Lu-Hf isotope geochemistry of chondrites and the evolution of the mantle-crust system. Earth and Planetary Science Letters, 148: 243-258. doi: 10.1016/S0012-821X(97)00040-X Chen, J. B., Wu, T. S., 1997. The regional stratigraphy in North China. China University of Geosciences Press, Wuhan, 1-199 (in Chinese with English abstract). Chen, P. J., Dong, Z. M., Zhen, S. N., 1998. An exceptionally well-preserved theropod dinosaur from the Yixian Formation of China. Nature, 391: 147-152. doi: 10.1038/34356 Chen, Y. X., Chen, W. J., 1997. Mesozoic volcanic rocks in western Liaoning and adjacent areas-Geochronology, geochemistry and tectonic setting. Seismic Press, Beijing, 1-279 (in Chinese with English abstract). Davis, G. A., 2005. The Late Jurassic " Tuchengzi/Houcheng" Formation of the Yanshan fold-thrust belt: An analysis. Earth Science Frontiers, 12: 331-345. Davis, G. A,, Zheng, Y. D., Wang, C., et al., 2001. Mesozoic tectonic evolution of the Yanshan fold and thrust belt, with emphasis on Hebei and Liaoning provinces, northern China. In: Hendrix, M. S., Davis, G. A., eds., Paleozoic and Mesozoic tectonic evolution of Central Asia: From continental assembly to intracontinental deformation. Geol. Soc. of Am. Memoir, 194: 171-198. Gao, S., Rudnick, R. L., Yuan, H. L., et al., 2004. Recycling lower continental crust in the North China craton. Nature, 432: 892-897. doi: 10.1038/nature03162 Iizuka, T., Hirata, T., 2005. Improvements of precision and accuracy in in situ Hf isotope microanalysis of zircon using the laser ablation-MC-ICPMS technique. Chemical Geology, 220: 121-137. doi: 10.1016/j.chemgeo.2005.03.010 Ji, Q., Currie, P. J., Norell, M A., et al., 1998. Two feathered dinosaurs from northeastern China. Nature, 393: 753-761. doi: 10.1038/31635 Liu, D. Y., Geng, Y. S., Song, B., 1997. Late Archean crustal accetion and reworking in northwestern Hebei Province: Isochronology evidence. Acta Geoscientia Sinica, 18(3): 226-232 (in Chinese with English abstract). Liu, Y. Q, , Li, P. X., Tian, S. G., 2003. SHRIMP U-Pb zircon age of Late Mesozioc tuff (lava) in Luanping basin, northern Hebei, and its implications. Acta Petrologica et Mineralogica, 22 (3): 237-244 (in Chinese with English abstract). Lu, F. X., Zheng, J. P., Zhang, R. S., et al., 2005. Phanero-zoic mantle secular evolution beneath the eastern North China craton. Earth Science Frontiers, 12: 61 -67 (in Chinese with English abstract). Niu, B. G., He, Z. J., Song, B., et al., 2003. SHRIMP geo-chronology of volcanics of the Zhangjiakou Formation and its significance. Geological Bulletin of China, 22: 140-141 (in Chinese with English abstract). Niu, B. G., He, Z. J., Song, B., et al., 2004. SHRIMP geo-chronology of volcanics of the Zhangjiakou and Yixan formations, northern Hebei Province, with a discussion on the age of the Xingpanling Group of the Great Hing-gan Mountain and volcanic strata of the southeastern coastal area of China. Acta Geologica Sinica (English Edition), 78: 1214-1228. doi: 10.1111/j.1755-6724.2004.tb00778.x Shao, J. A., Li, Z. T., Zhang, L. Q., 2004. Symmetric spatio-temporal distribution of the Meso-Cenozoic volcanic rocks in Liaoning and environs and its implications. Chinese Journal of Geology, 39: 98-106 (in Chinese with English abstract). Shao, J. A., Meng, Q. R., Wei, H. Q., et al., 2003a. Nature and tectonic environment of Late Jurassic volcanic-sedimentary basins in northwestern Hebei Province. Geological Bulletin of China, 22: 751-761 (in Chinese with English abstract). Shao, J. A., Zhang, L. Q., Chu, Z. Y., 2003b. Early Cretaceous volcanism-sedimentation in northern Hebei and its tectonic setting: A discussion. Geological Bulletin of China, 22: 384-390 (in Chinese with English abstract). Soderlund, U., Patchett, P. J., Vervoort, J. D., et al., 2004. The l76Lu decay constant determined by Lu-Hf and U-Pb isotope systematics of Precambrian mafic intrusions. Earth and Planetary Science Letters, 219: 311-324. doi: 10.1016/S0012-821X(04)00012-3 Sun, G., Dilcher, D. L., Zheng, S. L., et al., 1998. In search of the first flower: A Jurassic angiosperm: Archaef ructus, from Northeast China. Science, 282: 1692-1695. doi: 10.1126/science.282.5394.1692 Swisher, C. C., Wang, X. L., Zhou, Z. H., et al., 2002. Further support for a Cretaceous age for the feathered dinosaur beds of Liaoning, China: New 40Ar/39Ar dating of the Yixian and Tuchengzi formations. Chinese Science Bulletin, 47: 135-138. Swisher, C. C., Wang, Y. Q., Wang, X. L., et al., 1999. Cretaceous age of the feathered dinosaurs of Liaoning, China. Nature, 400: 58-61. doi: 10.1038/21872 Veevers, J. J., Saeed, A., Belousova, E. A., et al., 2005. U-Pb ages and source composition by Hf-isotope and trace-element analysis of detrital zircons in Permian sandstone and modern sand from southwestern Australia and a review of the paleogeographical and denudational history of the Yilgarn craton. Earth-Science Reviews, 68: 245-279. Wilde, S. A., Zhou, X. H., Nemchin, A. A., et al., 2003. Mesozoic crust-mantle interaction beneath the North China craton: A consequence of the dispersal of Gond-wanaland and accretion of Asia. Geology, 31: 817-820. Wong, W. H., 1927. Crustal movement and igneous activities in eastern China since Mesozoic time. Bulletin of Geological Society of China, 6: 9-36 (in Chinese). Woodhead, J., Hergt, J., Shelley, M., et al., 2004. Zircon Hf-isotope analysis with an excimer laser, depth profiling, ablation of complex geometries and concomitant age estimation. Chemical Geology, 209: 121-135. doi: 10.1016/j.chemgeo.2004.04.026 Wu, F. Y., Lin, J. Q., Wilde, S. A., et al., 2005a. Nature and significance of the Early Cretaceous giant igneous event in eastern China. Earth and Planetary Science Letters, 233: 103-119. doi: 10.1016/j.epsl.2005.02.019 Wu, F. Y., Yang, Y. H., Xie, L. W., et al., 2005b. Hf iso-topic compositions of the standard zircons and baddeley-ites used in U-Pb geochronology. Chemical Geology (in review). Wu, F. Y., Zhao, G. C., Wilde, S. A., et al., 2005c. Nd iso-topic constraints on crustal formation in the North China craton. Journal of Asian Earth Sciences, 24: 523-545. doi: 10.1016/j.jseaes.2003.10.011 Yang, J. H., Wu, F. Y., Wilde, S. A., 2003. A review of the geodynamic setting of large-scale Late Mesozoic gold mineralization in the North China craton: An association with lithospheric thinning. Ore Geology Reviews, 23: 125-152. doi: 10.1016/S0169-1368(03)00033-7 Yuan, H. L., Gao, S., Liu. X. M, et al., 2004. Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma mass spectrometry. Geostand. Newsl., 28: 353-370. doi: 10.1111/j.1751-908X.2004.tb00755.x Zhai, M. G., Zhu, R X., Liu, J. M., et al., 2004. Time range of Mesozoic tectonic regime inversion in eastern North China block. Science in China (Series D), 47: 151-159. Zhang, H., Liu, X. M., Zhang, Y. Q., et al., 2005. Zircon U-Pb ages and significance of bottom and top beds of Zhangjiakou Formation in Liaoning and Hebei provinces. Earth Science-Journal of China University of Geosciences, 30: 387-401 (in Chinese with English abstract). Zhao, G. C., Wilde, S. A., Cawood, P. A., et al., 2001. Ar-chean blocks and their boundaries in the North China craton: Lithological, geochemical, structural and P-T path constraints and tectonic evolution. Precambrian Research, 107: 45-73. doi: 10.1016/S0301-9268(00)00154-6 Zhou, X. H., Sun, M, Zhang, G. H., et al., 2002. Continental crust and lithospheric mantle interaction beneath North China: Isotopic evidence from granulite xenoliths in Hannuoba, Sino-Korean cratoa Lithos, 62: 111-124. Zhou, Z., Barrett, P. M., Hilton, J., 2003. An exceptionally preserved Lower Cretaceous ecosystem. Nature, 421: 807-814. doi: 10.1038/nature01420 陈晋镳, 武铁山, 1997. 华北区域地层. 武汉: 中国地质大学出版社, 1-199. 陈义贤, 陈文寄, 1997. 辽西及邻区中生代火山岩——年代学、地球化学和构造背景. 北京: 地震出版社, 1-279. 河北省地质局, 1996. 全国地层多重划分对比研究(13)——河北省岩石地层. 武汉: 中国地质大学出版社, 80-82. 刘敦一, 耿元生, 宋彪, 1997. 冀西北地区晚太古代大陆地壳的增生和再造——同位素年代学证据. 地球学报, 18 (3): 226-232. https://www.cnki.com.cn/Article/CJFDTOTAL-DQXB703.000.htm 柳永清, 李佩贤, 田树刚, 2003. 冀北滦平晚中生代火山碎屑(熔)岩中锆石SHRIMP U-Pb年龄及其地质意义. 岩石矿物学杂志, 22(3): 237-244. doi: 10.3969/j.issn.1000-6524.2003.03.005 路凤香, 郑建平, 张瑞生, 等, 2005. 华北克拉通东部显生宙地幔演化. 地学前缘, 12: 61-67. https://www.cnki.com.cn/Article/CJFDTOTAL-DXQY200501007.htm 牛宝贵, 和政军, 宋彪, 等, 2003. 张家口组火山岩SHRIMP定年及其重大意义. 地质通报, 22: 140-141. doi: 10.3969/j.issn.1671-2552.2003.02.010 邵济安, 李之彤, 张履桥, 2004. 辽西及邻区中—新生代火山岩的时空对称分布及其启示. 地质科学, 39: 98-106. doi: 10.3321/j.issn:0563-5020.2004.01.010 邵济安, 孟庆任, 魏海全, 等, 2003a. 冀西北晚侏罗世火山—沉积盆地的性质及构造环境. 地质通报, 22: 751-761. https://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD200310001.htm 邵济安, 张履桥, 储著银, 2003b. 冀北早白垩世火山-沉积作用及构造背景. 地质通报, 22: 384-390. https://www.cnki.com.cn/Article/CJFDTOTAL-ZQYD200306001.htm 翁文灏, 1927. 中国东部中生代以来之地壳运动及火山活动. 中国地质学会会志, 6: 9-36. https://www.cnki.com.cn/Article/CJFDTOTAL-DZXE192701001.htm 翟明国, 朱日祥, 刘建明, 等, 2003. 华北东部中生代构造体制转折的关键时限. 中国科学(D辑), 33: 913-920. https://www.cnki.com.cn/Article/CJFDTOTAL-JDXK200310000.htm 张宏, 柳小明, 张晔卿, 等, 2005. 冀北滦平-辽西凌源地区张家口组火山岩顶、底的单颗粒锆石U-Pb测年及意义. 地球科学——中国地质大学学报, 30: 387-401. https://www.cnki.com.cn/Article/CJFDTOTAL-DQKX200504002.htm -
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