Nov : Acta Geoscientica Sinica Vol.33 No.6: www. 地球学报.com 摘锆石年代学和地球化学证据 1), 1), 2), 1), 1) 1)

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1 Nov : Acta Geoscientica Sinica Vol.33 No.6: www. 地球学报.com 摘锆石年代学和地球化学证据 1), 1), 2), 1), 1) 1), ; 2), 要 :,, U-Pb, 2500 Ma, 2297 Ma, 2381 Ma,,, 2001 Ma, 1896 Ma, 1885 Ma, 1850 Ma,,,,,, 关键词 : ; ; ; ; 中图分类号 : P ; P597.1 文献标志码 : A doi: /cagsb The Metamorphic Evolution History of High Pressure Granulites in Chengde Area, Northern Margin of North China: Zircon Chronology and Geochemical Evidence CHU Hang 1), WANG Hui-chu 1), WEI Chun-jing 2), LIU Huan 1), ZHANG Kuo 1) 1) Tianjin Institute of Geology and Mineral Resourses, China Geological Survey, Tianjin ; 2) School of Earth and Space Sciences, Peking University, Beijing Abstract: High pressure granulites in Chengde area of northern Hebei province occur as tectonic lenses with weak deformation in a wide composite shear zone composed dominantly of granitic gneiss. The deep crust thermal dynamics and exhumation mechanism demonstrated by these granulites play a critical role in the study of the collisional orogenic model of North China craton and the tectonic evolution model of North China craton as a whole. According to the result of U-Pb isotopic dating for these high pressure granulites and their surrounding rocks, the age of the surrounding protolith is ca Ma. At around 2297 Ma, basic rock intruded granitic gneiss. At around 2381 Ma, subduction started, and then there occurred high-pressure-granulite-phase metamorphism. Following the subduction and a long-term crust thickening process, the exhumation at a certain point began after 2001 Ma. During the exhumation process, another basic dike invaded at around 1896 Ma. At 1885 Ma, the uplifting process and granulite-phase retrograde metamorphism took place. At 1850 Ma, a large part of North China experienced high-amphibolite phase metamorphic event including even partial melt. This event destroyed ( : ) ( : ) ( : ) : ; : : :,, chuhangjal@sina.com

2 978 most part of the Paleoproterozoic metamorphic evolution. It can thus be seen that Paleoproterozoic geological evolution history in Chengde area or even the whole northern part of North China was not one or two phases of independent events that happened in different places. Instead, it was a complex and continuous process. Previous studies only revealed events of a few stages, whereas the high pressure granulites in Chengde area have recorded much more information. Key words: trace element in zircons; chronology; high pressure basic granulite; Chengde; North China 20 60, Green (1967), 80 90, : (Droop, 1989) (Carney et al., 1991) (Dallmeyer et al., 1992) (Moskovchendo et al., 1993) (Snoeyenbos et al., 1995) (Indares, 1996) (O'brien, 1997) (DI Vincenzo et al., 1997) (Möller, 1998) (Bohlen, 1987; Harley, 1989; O brien et al., 2003) 2002,,,, (, 1991) (, 1992, 1995;, 1994;, 1999) (, 1993, 1998) (, 1995) (, 1998) (, l998) (, 1999) (, 2001) (, 2004) (, 1991;, 1991;, 1992;, 1993), Zhao (1999),,, (2009),, (1999) Grt+Cpx+Qtz, , ; Grt+Cpx±Opx±Hb+Pl, , GPa; Hb+Pl±Zo±Qtz, , GPa,, (2550±21) Ma(Sm-Nd), (2439.1±0.3) Ma( U-Pb), (1817±17) Ma( U-Pb)(, 1999;, 2000) : 1) ; 2),, PT, ; 3) 1 区域地质概况及高压麻粒岩野外特征, (, 2001),, km, : ( ) -TTG,

: 979,,,, ( ),,,, 1 2 岩相学特征 08JB01-1 D0416,,, ( : 40 59 52.79, 117 49 14.64 ),, 10% 15%,,, 0.8 3.

17, 117 49 8.24 ), 15% 15%:,, 0.15 0.8 mm, 20%:,, 0.2 4.5 mm, 30%:, 0.15 2 mm, 5%:,, 0.1 0.6 mm 15%:,, 0.

3 : 979,,,, ( ),,,, 1 2 岩相学特征 08JB01-1 D0416,,, ( : , ),, 10% 15%,,, mm 20% 25%,,, mm 20% 25%,,, mm 20% 25%,,, 0.6 mm 15% 20%,,, mm, 09JB34-1,,, ( : , ), 15% 15%:,, mm, 20%:,, mm, 30%:, mm, 5%:,, mm 15%:,, mm, 08JB01-2 D0416-1, 08JB01-1,, 图 1 冀北承德地区前寒武纪地质简图 Fig. 1 Precambrian geological sketch map of Chengde area in northern Hebei Province

4 980 40%,, -,, mm 30% 35%,,,, mm 25% 30%,,, mm 09JB33-1, ( : , ),,,, 35% 5%, -,, mm 40%,, 0.15~0.6 mm, 15%,,, mm 5%,,, mm 09JB33-2, mm 15%:,, mm, 10%: -, mm,,, 3 锆石原位微区 U-Pb 同位素定年 3.1, (2002),,, CL SHRIMP U-Pb SHRIMP II Compston (1992) TEMORA1, 417 Ma, 206 Pb/ 238 U= Kenneth R. Ludwig Squid(1.03 ) Isoplot 3 (Ludwig, 2003) (LA-MC-ICP-MS) U-Pb, (2009) NIST610 Pb U Th GJ-1 U Pb (Black et al., 2003; Jackson et al., 2004) ICP-MSDataCal (Liu et al., 2009) Ludwig Isoplot (Ludwig, 2003) U-Pb ( ), (LA-ICP-MS), Liu (2008) U Pb, GJ-1 (09JB33-1),, 25%,, ICP-MSDataCal (Liu et al., 2009) Ludwig Isoplot (Ludwig, 2003), 0.3~0.8 mm,, 50%:,, U-Pb ( ): 08JB01-1( 2),,,, U Pb, 11 (SHRIMP), 3 4 8,,, 207 Pb/ 206 Pb ( ) Ma, ( ) Ma, Th/U= , ( 7a) (21 23 ) Eu, (22 24 ) Eu,,, D0416( 3),,, :,,, ( SHRIMP, LA-ICP-MS ),, ( ) Ma, (Th/U 0.4, 0.5 ), (Th/U ), ( ) Ma,, 2001 Ma

5 : 981 Fig. 2 图 2 08JB01-1 锆石阴极发光图像 U-Pb 年龄谐和图 Cathodoluminescence images and U-Pb concordia diagram of zircons (08JB01-1) Fig. 3 图 3 D0416 锆石阴极发光图像 U-Pb 年龄谐和图 Cathodoluminescence images and U-Pb concordia diagram of zircons (D0416) 2381 Ma (, ( ) Ma) ( 7b), ( ), Th/U, ( ) Ma ( ) Ma,, 2001 Ma 2381 Ma,,, ( ) Ma, ( ( ) Ma), 09JB34-1( 4),,,,,, (LA-ICP-MS),, U Pb,, (Th/U 0.4, 5 ) ( 7c),, D0416, Eu, (1896±9) Ma(Th/U ), Eu, (1877±14) Ma (Th/U ),

6 982 Fig. 4 图 4 09JB34-1 锆石阴极发光图像 U-Pb 年龄谐和图 Cathodoluminescence images and U-Pb concordia diagram of zircons (09JB34-1) Eu,,,, Eu JB33-1( 5)(, ),,,, (LA-ICP-MS), ( ) Ma, Eu ( 7d), (1852 4) Ma( 08JB01-1 ), Eu ( 7d), 2517 Ma 2746 Ma, Th/U 0.1,,, , :,,,,, (LA-ICP-MS) 08JB01-2, 09JB33-2, D0416-1, (Th/U 0.1, 2.15),,,,, 09JB33-2 (2519±7) Ma, (2501±21) Ma,, ( 7e) Eu, D (2493±9) Ma, 08JB01-2 (2485±10) Ma Zr, Zr,, 1850 Ma 4 讨论与结论 1),, ( ) 2500 Ma, ( Fig. 5 图 5 09JB33-1 锆石阴极发光图像 U-Pb 年龄谐和图 Cathodoluminescence images and U-Pb concordia diagram of zircons (09JB33-1)

7 : 983 图 6 花岗片麻岩锆石阴极发光图像 U-Pb 年龄谐和图 Fig. 6 Cathodoluminescence images and U-Pb concordia diagram of zircons a-08jb01-2; b-09jb33-2; c-d0416-1, 2006),, (09JB33-2), 2500 Ma, TTG - (, 2011), (2006) 2) 2398 Ma, 2297~2001 Ma,,,,

984 (2006),, 2493 Ma, 2443 Ma, 1977 Ma 2003 Ma,, 2117 Ma(, 2005), 2041 Ma(, 2004), 2120

1850 Ma,, -, 1850 Ma -,,, 5),,, 致谢 : 中国地质调查局天津地质矿产研究所李怀坤研究员李惠民研究员耿建珍工程师郝爽工程师

作者在此一并致以诚挚的谢意图 7 锆石原位微区稀土元素球粒陨石标准化图解 ( 标准化数据自 Sun et al., 1989) Fig.

8 984 (2006),, 2493 Ma, 2443 Ma, 1977 Ma 2003 Ma,, 2117 Ma(, 2005), 2041 Ma(, 2004), 2120 Ma(, 2009) Ma, (1850 Ma ), 3)Kröner (2006) 1915 Ma,,,, 1896 Ma,,, 4) Ma,, -, 1850 Ma -,,, 5),,, 致谢 : 中国地质调查局天津地质矿产研究所李怀坤研究员李惠民研究员耿建珍工程师郝爽工程师张永清工程师等对锆石测年和数据处理工作给予了大力支持, 河北省廊坊区域地质矿产调查研究所实验室在单矿物分选薄片磨制薄片鉴定工作中给予了大力支持, 作者在此一并致以诚挚的谢意图 7 锆石原位微区稀土元素球粒陨石标准化图解 ( 标准化数据自 Sun et al., 1989) Fig. 7 Chondrite-normalized REE patterns of zircons (normalization value after Sun et al., 1989) 参考文献 :, [M]//,.. : :

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km 5 km Pt 2 x 2 1 Au 65 ~ ~ km 5 km 10 km 2 Au Au

km 5 km Pt 2 x 2 1 Au 65 ~ ~ km 5 km 10 km 2 Au Au 38 1 2015 3 JOURNAL OF EAST CHINA INSTITUTE OF TECHNOLOGY Vol. 38 No. 1 Mar. 2015 doi 10. 3969 /j. issn. 1674-3504. 2015. 01. 002 1 2 1 2 3 1. 471000 2. 471000 3. 510640 9 P618. 51 A 1674-3504 2015 01-0012-11.

Nov : Acta Geoscientica Sinica Vol.33 No.6: www. 地球学报.com 摘 锆石年代学和地球化学证据 1), 1), 2), 1), 1) 1)

Nov : Acta Geoscientica Sinica Vol.33 No.6: www. 地球学报.com 摘锆石年代学和地球化学证据 1), 1), 2), 1), 1) 1)