摘要
怀安地区构造变形强烈,是研究华北克拉通形成和演化的重要窗口。通过对该区基底变质岩系构造形迹进行研究,结合区域地质资料及同位素年龄数据,将该区早前寒武纪构造变形序列划分为4期:新太古代阜平晚期(D1),桑干岩群韧性变形,形成片麻理、无根褶皱和韧性剪切带;新太古代五台晚期(D2),在新太古代TTG/花岗岩中形成区域性片麻理和条带状构造,并在桑干岩群中形成近EW向的复式背形和向形构造;古元古代吕梁中期(D3),集宁岩群沙渠村岩组形成区域性片麻理,并形成与片麻理一致的NE向韧性剪切带,在新太古代地质体中叠加近SN向的开阔复式背形和向形构造;古元古代吕梁晚期(D4),红旗营子岩群太平庄岩组形成片理和片麻理,尚义—平泉断裂形成。建立了该区早前寒武纪构造演化模式,并将其划分为新太古代陆壳增生阶段和古元古代碰撞造山阶段,对理解华北克拉通的形成及演化具有重要意义。
Huai'an,with strong tectonic deformation,is an important place to understand the formation and evolution of North China Craton. Based on the investigation of structural deformation in the basement metamorphic rock series,and combined with the regional geological data and isotopic age data,the Early Precambrian deformation sequence is divided into four periods. The first stage is late Fuping movement of New Archean( D1). Sanggan Group was ductile deformed to form gneiss,rootless folds and ductile shear zone. The second stage is late Wutai movement of New Archean( D2). The schistosity and banded structures of TTG were formed in the New Archean.Simultaneously,EW antiformorium was formed in the Sanggan Group. The third stage is middle Lvliang movement of Palaeoproterozoic( D3). Regional schistosity was formed in Jining Group of Shaqucun petrofabric,and NE ductile shear zone was also formed. SN antiformorium was superimposed on the New Archean geological bodies.The fourth stage is late Lvliang movement of Palaeoproterozoic( D4). Schistosity was formed in Hongqiyingzi Group of Taipingzhuang petrofabric,and Shangyi-Pingquan Fault was formed. In addition,the Early Precambrian tectonic evolution model of this area was established,and it was divided into two stages: continental crust accretion in New Archean and collision orogeny in Paleoproterozoic,which is of great significance in understanding the formation and evolution of North China Craton.
引文
[1]张华锋,王浩铮,豆敬兆,等.华北克拉通怀安陆块新太古代低铝和高铝TTG片麻岩的地球化学特征与成因[J].岩石学报,2015,31(6):1518-1534.
[2]刘敦一,耿元生,宋彪.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[J].地球学报,1997,18(3):226-232.
[3]刘富,郭敬辉,路孝平,等.华北克拉通2.5 Ga地壳生长事件的Nd-Hf同位素证据:以怀安片麻岩地体为例[J].科学通报,2009,54(17):2517-2526.
[4]Zhang H F,Zhai M G,Santosh M,et al.Geochronology and petrogenesis of Neoarchean potassic meta-granites from Huai’an Complex:Implications for the evolution of the North China Craton[J].Gondwana Research,2011,20(1):82-105.
[5]翟明国,卞爱国.华北克拉通新太古代末超大陆拼合及古元古代末—中元古代裂解[J].中国科学:D辑,2000,30(增刊):129-137.
[6]Zhao G C,Sun M,Wilde S A,et al.Late Archean to Paleoproterozoic evolution of the North China Craton:key issues revised[J].Precambrian Research,2005,136(2):177-202.
[7]赵国春.华北克拉通基底主要构造单元变质作用演化及其若干问题讨论[J].岩石学报,2009,25(8):1772-1792.
[8]Kusky T M,Li J H,Santosh M.The Paleoproterozoic North Hebei Orogen:North China Craton's collisional suture with the Columbia supercontinent[J].Gondwana Research,2007,12(1/2):4-28.
[9]翟明国.克拉通化与华北陆块的形成[J].中国科学:地球科学,2011,41(8):1037-1046.
[10]翟明国.中国主要古陆与联合大陆的形成——综述与展望[J].中国科学:地球科学,2013,43(10):1583-1606.
[11]罗志波,张华锋,第五春荣,等.冀西北怀安地区中性辉石麻粒岩的锆石U-Pb、Lu-Hf及微量元素组成对区域退变质时代的制约[J].岩石学报,2012,28(11):3721-3738.
[12]张旗,翟明国.太古宙TTG岩石是什么含义?[J].岩石学报,2012,28(11):3446-3456.
[13]河北省地质调查院区调所.1∶25万张家口市幅区域地质调查报告[R].2008:18-19.
[14]翟明国,澎湃.华北克拉通古元古代构造事件[J].岩石学报,2007,23(11):2665-2682.
[15]钟焱,陈雅丽,翟明国,等.华北克拉通西部古元古代孔兹岩系的地层对比、岩相古地理特征及其地质意义[J].岩石学报,2016,32(3):713-726.
[16]Li J H,Qian X L,Liu S W.Geochemistry of khondalites from the central portion of North China Craton(NCC):Implications for the continental cratonization in the Neoarchean[J].Science in China Series D:Earth Sciences,2000,43(3):253-265.
[17]Peng P,Wang X P,Windley B F,et al.Spatial distribution of~1 950~1 800 Ma metamorphic events in the North China Craton:Implications for tectonic subdivision of the craton[J].Lithos,2014,202/203:250-266.
[18]刘树文,吕勇军,凤永刚,等.冀北红旗营子杂岩的锆石、独居石年代学及地质意义[J].地质通报,2007,26(9):1086-1100.
[19]杨振升,徐仲元,刘正宏,等.高级变质区地质调查与综合研究方法[M].北京:地质出版社,2008.
[20]高勇,丁华磊,郭瑞军,等.北山造山带公路井—三个井韧性剪切带构造变形特征及其地质意义[J].中国地质调查,2016,3(1):26-34.
[21]Zhao G C,Zhai M G.Lithotectonic elements of Precambrian basement in the North China Craton:Review and tectonic implications[J].Gondwana Research,2013,23(4):1207-1240.
[22]Liu D Y,Wan Y S,Wu J S,et al.Chapter 3.5 Eoarchean rocks and zircons in the North China Craton[J].Developments in Precambrian Geology,2007,15:251-273.
[23]翟明国.华北克拉通的形成以及早期板块构造[J].地质学报,2012,86(9):1335-1349.
[24]Zhai M G,Guo J H,Liu W J.Neoarchean to Paleoproterozoic continental evolution and tectonic history of the North China Craton:A review[J].Journal of Asian Earth Sciences,2005,24(5):547-561.
[25]Yang J H,Wu F Y,Wilde S A,et al.Petrogenesis and geodynamics of Late Archean magmatism in eastern Hebei,eastern North China Craton:Geochronological,geochemical and Nd-Hf isotopic evidence[J].Precambrian Research,2008,167(1/2):125-149.
[26]Peng P,Guo J H,Windley B F,et al.Petrogenesis of Late Paleoproterozoic Liangcheng charnockites and S-type granites in the central-northern margin of the North China Craton:Implications for ridge subduction[J].Precambrian Research,2012,222/223:107-123.
[27]Zhao G C.When did plate tectonics begin on the North China Craton?Insights from metamorphism[J].Earth Science Frontiers,2007,14(1):19-32.
[28]白瑾,黄学光,戴凤岩,等.中国前寒武纪地壳演化[M].北京:地质出版社,1993:36-38.
[29]沈其韩,徐惠芬,张宗清,等.中国早前寒武纪麻粒岩[M].北京:地质出版社,1992:389-400.
[30]魏颖,郑建平,苏玉平,等.怀安麻粒岩锆石U-Pb年代学及Hf同位素:华北北缘下地壳增生再造过程研究[J].岩石学报,2013,29(7):2281-2294.
[31]刘树文,吕勇军,凤永刚,等.冀北单塔子杂岩的地质学和锆石U-Pb年代学[J].高校地质学报,2007,13(3):484-497.
[32]Zhao G C,Wilde S A,Sun M,et al.SHRIMP U-Pb zircon geochronology of the Huai’an complex:Constraints on Late Archean to Paleoproterozoic magmatic and metamorphic events in the TransNorth China Orogen[J].American Journal of Science,2008,308(3):270-303.
[33]Jiang N,Guo J H,Zhai M G,et al.~2.7 Ga crust growth in the North China Craton[J].Precambrian Research,2010,179(1/2/3/4):37-49.
[34]李创举,包志伟,赵振华,等.张家口地区桑干杂岩中花岗片麻岩的锆石U-Pb年龄与Hf同位素特征及其对华北克拉通早期演化的制约[J].岩石学报,2012,28(4):1057-1072.
[35]耿元生,沈其韩,任留东.华北克拉通晚太古代末—古元古代初的岩浆事件及构造热体制[J].岩石学报,2010,26(7):1945-1966.
[36]翟明国.华北克拉通两类早前寒武纪麻粒岩(HT-HP和HTUHT)及其相关问题[J].岩石学报,2009,25(8):1753-1771.
