楊付領(lǐng) ,牛寶貴,任紀(jì)舜*,李 舢

1)中國(guó)地質(zhì)大學(xué)(北京)地球科學(xué)與資源學(xué)院,北京 100083;2)中國(guó)地質(zhì)科學(xué)院地質(zhì)研究所,北京 100037

馬蘭峪復(fù)式背斜位于燕山造山帶南緣,為一條形成于中生代的東西向構(gòu)造。河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì)、中國(guó)地質(zhì)科學(xué)院地質(zhì)力學(xué)所和中國(guó)地質(zhì)大學(xué)的地質(zhì)工作者曾在這一區(qū)域開展地質(zhì)填圖或?qū)ｎ}研究工作,發(fā)表了一系列有價(jià)值的研究成果(河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì),1966,1970;河北省區(qū)域地質(zhì)礦產(chǎn)勘查開發(fā)局,2000;崔盛芹等,2002;中國(guó)地質(zhì)大學(xué)(北京)地質(zhì)調(diào)查研究院,2004;張長(zhǎng)厚等,2004ab,2011)。引人注目的是,在馬蘭峪復(fù)式背斜核部發(fā)育有一系列呈東西向線狀展布的中生代中酸性侵入巖體,其形成時(shí)代從晚三疊世至晚侏羅世均有分布,這些侵入巖體必然與馬蘭峪復(fù)式背斜的褶皺過程有著密切的成生聯(lián)系。因此作者以馬蘭峪復(fù)式背斜核部的中生代侵入巖體作為研究對(duì)象,應(yīng)用同位素年代學(xué)與巖石地球化學(xué)技術(shù)方法,結(jié)合區(qū)域構(gòu)造,探討馬蘭峪背斜的形成時(shí)代、形成過程及其地質(zhì)構(gòu)造意義。

馬蘭峪復(fù)式背斜地處承德復(fù)式向斜之南,西起平谷、東至秦皇島,整體為一近EW向的復(fù)式背斜構(gòu)造,長(zhǎng)約110 km,核部寬25～30 km。背斜核部主要指興隆—薊縣一線之東太古界變質(zhì)結(jié)晶基底出露的區(qū)域,在青龍縣以南可見中、新元古界蓋層殘留其上(圖1)。其核部變質(zhì)巖系主要為角閃斜長(zhǎng)片麻巖,被沿復(fù)背斜核部分布的一系列中生代中酸性巖體侵入。背斜兩翼地層基本對(duì)稱,分別向南、北傾斜,中、新元古界至古生界地臺(tái)蓋層發(fā)育有次一級(jí)褶曲,如南翼的東蓮花院背斜,構(gòu)造線方向與背斜軸基本平行,組成一完整的復(fù)式背斜形態(tài)。背斜南翼多處可見中元古界長(zhǎng)城系常州溝組底部紅褐色石英巖狀砂巖角度不整合于太古界片麻巖之上,北翼由于斷層破壞,僅在興隆之南背斜傾伏端,可見常州溝組底部暗紅色砂礫巖角度不整合于太古代基底巖石之上。

圖1 馬蘭峪地區(qū)地質(zhì)簡(jiǎn)圖(據(jù)河北省地質(zhì)礦產(chǎn)局,1989修改)Fig.1 Geological sketch map of Malanyu area (modified after Hebei Bureau of Geology and Mineral Resources,1989)

表1 樣品位置、礦物組成特征Table 1 Sampling locations and mineral composition of the Mesozoic intrusive bodies

中生代陸相上疊盆地沉積主要分布于馬蘭峪背斜兩翼和承德復(fù)向斜,進(jìn)一步可劃分為先后三個(gè)世代(徐剛等,2006)。第一世代,由早侏羅世杏石口組、南大嶺組和下花園組地層構(gòu)成,自下而上為一套砂巖、礫巖,基性至中性火山巖和含煤巖系組成的盆地充填地層,早中三疊世紫紅色長(zhǎng)石巖屑砂巖被早侏羅世杏石口組微角度不整合覆蓋;第二世代,由九龍山組、髫髻山組和土城子組盆地充填巖系構(gòu)成,時(shí)代為中—晚侏羅世包括早白堊世初期部分地層,分布廣泛。在背斜北翼中北部前中侏羅世褶皺地層大范圍掩覆于盆地充填地層之下,中侏羅世晚期九龍山組或髫髻山組角度不整合于早侏羅世杏石口組或下花園組地層之上并超覆于中、新元古界和古生界地臺(tái)蓋層之上;第三世代,由早白堊世張家口組火山巖或義縣組構(gòu)成,不整合于一切老地質(zhì)體之上。上述中生代地層間的三個(gè)不整合面分別代表了中生代印支運(yùn)動(dòng)與燕山運(yùn)動(dòng)Ⅰ幕和Ⅱ幕,區(qū)域內(nèi),由這三期造山作用所形成的構(gòu)造線方向均為近東西走向,其褶皺構(gòu)造具顯著的同軸疊加特點(diǎn)。結(jié)合灤平盆地和承德盆地張家口組底部時(shí)代確定為136～135 Ma(牛寶貴等,2003;趙越等,2004),可以基本限定燕山Ⅱ幕造山作用結(jié)束的時(shí)間應(yīng)在晚侏羅世—早白堊世初(135 Ma之前)。

馬蘭峪背斜核部的中生代巖漿巖帶自西向東主要由麻地、王坪石、茅山、前分水嶺、羅文峪、高家店、青山口、賈家山、肖營(yíng)子和都山以及分布于其間的數(shù)個(gè)小巖體組成(圖1)。巖體形態(tài)多為橢圓狀,長(zhǎng)軸與背斜軸基本平行,大部分巖體為復(fù)式巖體。近些年,分布于背斜核部東段與成礦密切相關(guān)的侵入巖體獲得了較好的年代學(xué)數(shù)據(jù)(羅鎮(zhèn)寬等,2001a,b,2003;張長(zhǎng)厚等,2004a;郭少豐等,2009;李強(qiáng)等,2012;陸繼龍等,2012;葉浩等,2014),而其它非成礦巖體的年代學(xué)與巖石地球化學(xué)報(bào)道較少,雖也有一些年齡數(shù)據(jù),但多采用K-Ar或Rb-Sr等技術(shù)手段測(cè)試得到,精度不高且差異大。因此,分析每個(gè)巖體的形成年齡,研究其形成的構(gòu)造條件不僅對(duì)認(rèn)識(shí)馬蘭峪背斜的形成,而且對(duì)燕山地區(qū)中生代構(gòu)造演化過程均具有重要的意義。本文采用LA-MC-ICP-MS鋯石原位微區(qū)定年技術(shù)分析部分巖體的形成時(shí)代,用于分析的樣品采樣位置及詳細(xì)信息見圖1和表1。

1 主要巖體的U-Pb年齡和地球化學(xué)特征

1.1 分析方法

樣品主量元素和微量元素分析在核工業(yè)北京地質(zhì)研究院分析測(cè)試研究中心完成。主量元素分析采用 X射線熒光光譜儀(XRF)分析,測(cè)試精密度RSD<2%～8%。微量元素分析采用 XR電感耦合等離子體質(zhì)譜分析(ICP MS),測(cè)試精密度RSD<10%。

鋯石 U-Pb同位素分析在天津地質(zhì)礦產(chǎn)研究所同位素實(shí)驗(yàn)室完成。使用激光燒蝕多接收器電感耦合等離子體質(zhì)譜儀(LA-MC-ICP MS),激光器為美國(guó)ESI公司生產(chǎn)的UP193-FXArF準(zhǔn)分子激光器,激光波長(zhǎng)193 nm,脈沖寬度5 ns,束斑直徑為35 μm,脈沖頻率8～10 Hz。激光剝蝕物質(zhì)以He為載氣送入Neptune,利用動(dòng)態(tài)變焦擴(kuò)大色散可以同時(shí)接收質(zhì)量數(shù)相差很大的U-Pb同位素,進(jìn)行鋯石U-Pb同位素原位測(cè)定。采用中國(guó)地質(zhì)大學(xué)劉勇勝博士研發(fā)的ICP MS DataCal程序和 Kenneth R1 Ludwig的Isoplot程序進(jìn)行數(shù)據(jù)處理,208Pb校正法對(duì)普通鉛進(jìn)行校正,利用SRM610玻璃標(biāo)樣作為外標(biāo)計(jì)算鋯石樣品的Pb、U、Th含量。

1.2 鋯石U-Pb年齡

6件樣品中鋯石顆粒晶型均完整,主要為柱狀、橢圓狀或短柱狀,晶體粒徑變化于40～200 μm之間,鋯石均具有典型的巖漿生長(zhǎng)振蕩環(huán)帶結(jié)構(gòu)(圖2)。

根據(jù)宋彪等(2008)的研究認(rèn)為:“通常,一個(gè)巖體樣品中鋯石成因復(fù)雜,有巖漿侵位過程中形成的,亦有捕獲的,各自具有不同的年齡和意義,實(shí)際上,一個(gè)樣品中鋯石測(cè)定得足夠多,那么其中最年輕顆粒的年齡就最接近巖體最后的形成時(shí)間,即巖體結(jié)晶冷卻時(shí)間”。鑒于本區(qū)巖體有相當(dāng)一部分為晚三疊世—侏羅紀(jì)印支—燕山階段多期次侵入形成的復(fù)式巖體,這在野外和以往的定年研究已得到證實(shí);另本次測(cè)試樣品中還出現(xiàn)有連續(xù)的鋯石年齡,這很可能是由巖體在深部滯留期間連續(xù)結(jié)晶所致,故選取其中最年輕的若干顆粒的206Pb/238U年齡加權(quán)平均值作為巖體最終形成或結(jié)晶年齡。

圖2 測(cè)年鋯石陰極發(fā)光圖像(圓圈為激光剝蝕位置)Fig.2 Cathodoluminescence (CL) images of representative zircons (small circles are LA-MC-ICP-MS U-Pb analysis spots.)

王坪石巖體二長(zhǎng)花崗巖(Mly-8),共測(cè)試 30粒鋯石獲得30個(gè)數(shù)據(jù),其中1、15號(hào)點(diǎn)數(shù)據(jù)偏離U-Pb諧和線且206Pb/238U和207Pb/235U年齡差異大;其余數(shù)據(jù)在 U-Pb諧和圖中的投影位置落于諧和線或附近(圖3A),鋯石206Pb/238U年齡大致可分為5組(圖3a),按照上述觀點(diǎn),取其最年輕的一組(5、6、9、12、13、19、21、29)8粒鋯石206Pb/238U年齡介于164～158 Ma之間,給出的加權(quán)平均值為(162.3±1.3) Ma,作為該巖體二長(zhǎng)花崗巖的結(jié)晶年齡;其余4組年齡相對(duì)偏老,依直方圖的概率曲線確定其峰值年齡分別為191 Ma、180 Ma、172 Ma和167 Ma,為繼承鋯石的年齡。

前分水嶺巖體二長(zhǎng)花崗巖(Mly-19),共測(cè)試 30粒鋯石獲得的30個(gè)數(shù)據(jù)在U-Pb諧和圖中的投影位置落于諧和線或附近(圖3B),鋯石206Pb/238U年齡大致可分為4組(圖3b),同上述觀點(diǎn),取其最年輕的一組(9、13、26)3粒鋯石206Pb/238U年齡介于 155～153 Ma之間,給出的加權(quán)平均值為(153.8±2.7) Ma,作為該巖體二長(zhǎng)花崗巖的結(jié)晶年齡;其余3組年齡相對(duì)偏老,依直方圖的概率曲線確定其峰值年齡分別為178 Ma、170 Ma和164 Ma,為繼承鋯石的年齡。

英譯文：After going through a system of analysis,the Dou Qi rankings in the Dou Qi Continent got split into four different classes-Tian,Di,Xuan,Huang and every class was split further into Beginner,Medium and High ranks!

茅山巖體二長(zhǎng)花崗巖(Mly-20),共測(cè)試26粒鋯石獲得的26個(gè)數(shù)據(jù)在U-Pb諧和圖中的投影位置落于諧和線或附近(圖 3C),鋯石206Pb/238U年齡大致可分為3組(圖3c),取其最年輕的一組(18、22)2粒鋯石206Pb/238U年齡介于164～161 Ma之間,給出的加權(quán)平均值為(162.7±1.5) Ma,作為該巖體二長(zhǎng)花崗巖結(jié)晶年齡;其余 2組年齡相對(duì)偏老,依直方圖的概率曲線確定其峰值年齡分別為 176 Ma和170 Ma,為繼承鋯石的年齡。

高家店巖體石英閃長(zhǎng)巖(Mly-27),共測(cè)試32粒鋯石獲得32個(gè)數(shù)據(jù),其中8、10、19、30、32號(hào)點(diǎn)數(shù)據(jù)偏離U-Pb諧和線且206Pb/238U和207Pb/235U年齡差異大;其余數(shù)據(jù)在 U-Pb諧和圖中的投影位置落于諧和線或附近(圖 3D),鋯石206Pb/238U年齡大致可分為3組(圖3d),取其最年輕的一組(2、3、5～7、9、12～15、17、21、24、28)14粒鋯石206Pb/238U年齡介于 174～164 Ma之間,給出的加權(quán)平均值為(170.5±1.8) Ma,作為該巖體石英閃長(zhǎng)巖的結(jié)晶年齡;其余 2組年齡相對(duì)偏老,依直方圖的概率曲線確定其峰值年齡分別為186 Ma和176 Ma,為繼承鋯石的年齡。

圖3 鋯石U-Pb諧和圖和年齡頻率分布圖Fig.3 U-Pb concordia and probability diagrams of zircon 206Pb/238U ages

肖營(yíng)子巖體鉀長(zhǎng)花崗巖(Mly-32),共測(cè)試32粒鋯石獲得32個(gè)數(shù)據(jù),其中4、11、13、16號(hào)點(diǎn)數(shù)據(jù)偏離U-Pb諧和線且206Pb/238U和207Pb/235U年齡差異大;其余數(shù)據(jù)在 U-Pb諧和圖中的投影位置落于諧和線或附近(圖3E),鋯石206Pb/238U年齡大致可分為3組(圖3e),取其最年輕的一組(1、3、6～8、12、14、17、20、21、23、25、27～29、31)16 粒鋯石206Pb/238U年齡介于 191～183 Ma之間,給出的加權(quán)平均值為(186.8±1.3) Ma,作為該巖體鉀長(zhǎng)花崗巖的結(jié)晶年齡;其余 2組年齡相對(duì)偏老,依直方圖的概率曲線確定其峰值年齡分別為201 Ma和193 Ma,為繼承鋯石的年齡。

圖4 稀土元素球粒隕石標(biāo)準(zhǔn)化配分圖(A)和微量元素原始地幔標(biāo)準(zhǔn)化蜘蛛圖解(B) (球粒隕石和原始地幔標(biāo)準(zhǔn)數(shù)據(jù)參考Sun et al.,1989;圖中虛線為閃長(zhǎng)巖,實(shí)線為花崗巖)Fig.4 Chondrite-normalized REE patterns (A) and primitive mantle-normalized spidergrams (B) of the intrusive bodies from the core of the Malanyu anticline (the values of chondrite and primitive mantle are from Sun et al.,1989;Solid lines represent the granite,and dotted line represents diorite)

肖營(yíng)子巖體花崗閃長(zhǎng)巖(Mly-39),共測(cè)試31粒鋯石獲得的31個(gè)數(shù)據(jù)在U-Pb諧和圖中的投影位置落于諧和線或附近(圖3F),鋯石206Pb/238U年齡大致可分為3組(圖3f),取其最年輕的一組(21～25、28)6粒鋯石206Pb/238U年齡介于166～161 Ma之間,給出的加權(quán)平均值為(164.6±2.2) Ma,作為該巖體花崗閃長(zhǎng)巖的結(jié)晶年齡;其余 2組年齡相對(duì)偏老,依直方圖的概率曲線確定其峰值年齡分別為175 Ma和170 Ma,為繼承鋯石的年齡。

1.3 巖體地球化學(xué)特征

馬蘭峪背斜核部中生代中酸性侵入巖體總體上可分為閃長(zhǎng)巖類和花崗巖類。閃長(zhǎng)巖總體表現(xiàn)為低Si(SiO2=55.28%～66.26%)、Mg(MgO=1.6%～3.17%),高Al(Al2O3=16.17%～16.57%)、Ga(CaO=3.03%～6.22%),K2O/Na2O比＜1,A/CNK值＜1,為準(zhǔn)鋁質(zhì);花崗巖總體表現(xiàn)為高Si(SiO2=73.57%～75.77%)、Al(Al2O3=12.97%～14.62%)、Ga(CaO=0.47%～1.07%),低Mg(MgO=0.14%～0.29%),K2O/Na2O比≈1,A/CNK值＞1,為偏鋁質(zhì)。對(duì)于同一巖體不同巖性單元,隨著 SiO2含量的增加,K2O表現(xiàn)為一致增加,其余各主量元素均表現(xiàn)為一致減少,顯示出巖漿分異特征。巖體稀土總量總體偏低(∑REE=82×10-6～349×10-6,平均 155×10-6),在稀土元素球粒隕石標(biāo)準(zhǔn)化圖中(圖4A),各巖體配分曲線相似,均表現(xiàn)為左陡右緩的輕稀土元素富集、重稀土元素虧損型式((La/Yb)N=3.53～44.32,平均18.98),具有不明顯或弱 Eu負(fù)異常,其中花崗巖類較閃長(zhǎng)巖類 Eu負(fù)異常明顯。微量元素原始地幔標(biāo)準(zhǔn)化圖中(圖4B),各巖體具有相似配分曲線特征,K、Pb大離子親石元素富集,Nb、Ta、P、Ti、Zr等高場(chǎng)強(qiáng)元素虧損。另閃長(zhǎng)巖的 Ba(339×10-6～1806×10-6,平均1067×10-6)、Sr(106×10-6～980×10-6,平均402×10-6)均高于一般花崗巖的Ba、Sr含量,表現(xiàn)為高Ba-Sr的特點(diǎn)。

2 討論

通過以上工作我們得到了馬蘭峪背斜核部中生代侵入巖體的年代學(xué)和地球化學(xué)的基本特征,在此基礎(chǔ)上,本文結(jié)合區(qū)域構(gòu)造和前人研究成果,探討馬蘭峪背斜的形成時(shí)代、形成過程及其大地構(gòu)造意義。

表2 馬蘭峪背斜核部中生代侵入巖體同位素年齡表Table 2 Isotope ages of the Mesozoic intrusive bodies from the core of the Malanyu anticline

根據(jù)上述獲得幾個(gè)巖體的鋯石U-Pb年齡,得出各巖體侵位結(jié)晶年齡由老至新依次為:前分水嶺二長(zhǎng)花崗巖為(153.8±2.7) Ma,茅山二長(zhǎng)花崗巖為(162.7±1.5) Ma,王 坪 石 二 長(zhǎng) 花 崗 巖 為 (162.3±1.3) Ma,肖營(yíng)子花崗閃長(zhǎng)巖為(164.6±2.2) Ma,高家店二長(zhǎng)閃長(zhǎng)巖為(170.5±1.8) Ma,肖營(yíng)子鉀長(zhǎng)花崗巖(186.8±1.3) Ma;各巖體的繼承巖漿鋯石的峰值年齡可進(jìn)一步歸納為167～164 Ma、172～170 Ma、180～175 Ma 和201～186 Ma幾組(圖3)。這一結(jié)果基本反映了馬蘭峪背斜核部花崗質(zhì)巖漿活動(dòng)的時(shí)代范圍,與前人研究成果可互為印證與補(bǔ)充(Zhang et al.,2014),并可將馬蘭峪背斜核部中生代侵入巖體時(shí)代大致分別歸屬于印支期(224～186 Ma)和燕山期(180～153 Ma)(表2),以燕山期為主,與區(qū)域內(nèi)構(gòu)造運(yùn)動(dòng)完全協(xié)調(diào)一致。這也反映了馬蘭峪復(fù)式背斜開始形成于印支期,并最終完成于燕山期,期間伴隨與構(gòu)造活動(dòng)協(xié)調(diào)一致的巖漿活動(dòng)。

區(qū)域地質(zhì)填圖和專題研究表明,馬蘭峪背斜是水平擠壓背景下形成的基底結(jié)晶巖系與蓋層共同卷入褶皺作用的厚皮式構(gòu)造,構(gòu)造作用使地殼加厚到近 50 km(河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì),1966;Chen,1998;李海龍等,2008;張長(zhǎng)厚等,2011)。一些學(xué)者分析了馬蘭峪背斜核部巖體以及這一區(qū)域中生代高鍶花崗巖和中晚侏羅世髫髻山組火山巖地球化學(xué)特征認(rèn)為其形成于陸內(nèi)造山擠壓環(huán)境,巖漿應(yīng)來(lái)源于下地殼古老變質(zhì)巖,同時(shí)有地幔物質(zhì)的加入(李伍平等,2004,2007;劉紅濤等,2002;李承東等,2004;馬君,2009;李小偉等,2010;Li et al.,2013;葉浩等,2014)。本文所列舉的馬蘭峪背斜核部侵入巖體具有相似微量元素配分模式、左陡右傾型的稀土元素配分曲線、不明顯或弱的 Eu負(fù)異常以及部分巖體具有高Ba-Sr花崗巖特征表明其巖漿確實(shí)來(lái)源于加厚的下地殼,具有殼?；旌咸卣鳌Ｒ巴饪梢娡跗菏瘞r體鉀長(zhǎng)花崗巖、高家店二長(zhǎng)閃長(zhǎng)巖和肖營(yíng)子花崗斑巖中有暗色包體出現(xiàn)也指示了殼幔混合作用。上述事實(shí)說明馬蘭峪背斜在其形成過程中,其構(gòu)造作用已觸及下地殼并引起上地幔頂部物質(zhì)運(yùn)動(dòng),上地幔物質(zhì)的底侵作用使下地殼物質(zhì)部分熔融,使得以花崗巖等為主體的中酸性巖漿沿背斜核部不斷侵入。因此,馬蘭峪背斜形成過程,不僅是地殼表層物質(zhì)的運(yùn)動(dòng),而且涉及下地殼甚至上地幔部分的構(gòu)造巖漿作用過程。

除劇烈的地殼褶皺作用外,燕山及其北側(cè)的內(nèi)蒙地軸還發(fā)育有規(guī)模巨大的深部斷裂,由北向南有康?！獓鷪?chǎng)斷裂帶和赤城—隆化斷裂帶等。北緣康?！獓鷪?chǎng)斷裂在270～250 Ma、230～210 Ma均具強(qiáng)烈的深層次韌性剪切變形(Wang et al.,2013);赤城—隆化斷裂帶也經(jīng)歷了多次斷裂活動(dòng):263～252 Ma、244～233 Ma、180～162 Ma(王瑜,1994;胡玲等,2002;Wang et al.,2013),斷裂作用形成的糜棱巖的變質(zhì)程度已達(dá)到高綠片巖相的變質(zhì)條件,表明其形成深度也已達(dá)到中、下地殼。

從燕山地區(qū)中生代的沉積-火山巖地層序列看出,燕山地區(qū)中、晚三疊世時(shí)曾經(jīng)受了印支造山運(yùn)動(dòng),伴有大量花崗巖侵入,之后南大嶺火山巖噴出。侏羅紀(jì)時(shí)期,以九龍山組或髫髻山組之下角度不整合為其上限,和以張家口組之下的角度不整合為其上限的兩個(gè)不整合面為界限的燕山運(yùn)動(dòng)兩幕造山作用均發(fā)育強(qiáng)烈火山作用和大量花崗巖侵入。這就充分說明了燕山造山帶是涉及全地殼的一個(gè)構(gòu)造-巖漿活動(dòng)帶,中生代的構(gòu)造運(yùn)動(dòng)使得這里的大陸地殼卷入造山作用中,完全改變了這里大陸殼原來(lái)的穩(wěn)定狀態(tài),進(jìn)入一個(gè)構(gòu)造-巖漿活化的新階段,即濱太平洋構(gòu)造-巖漿活化的新階段(任紀(jì)舜等,1980,1990,1999;劉鳳山等,1998;李秋生等,2008)

3 結(jié)論

通過對(duì)馬蘭峪復(fù)式背斜核部中生代侵入巖體的鋯石 U-Pb定年分析認(rèn)為,背斜核部中生代侵入巖形成時(shí)期大致可分為印支期和燕山期,與區(qū)域內(nèi)構(gòu)造作用完全同步。侵入巖地球化學(xué)特征表明其巖漿可能來(lái)源于上地幔物質(zhì)底侵引起下地殼基性巖石部分熔融。這說明馬蘭峪復(fù)式背斜并不僅是印支造山運(yùn)動(dòng)的產(chǎn)物,而是開始形成于印支期,最終完成于燕山期;說明燕山地區(qū)中生代的構(gòu)造運(yùn)動(dòng)并不僅是地殼表層的構(gòu)造作用,而是涉及下地殼甚至上地幔的構(gòu)造運(yùn)動(dòng),它使燕山地區(qū)大陸地殼由原來(lái)穩(wěn)定的克拉通狀態(tài)進(jìn)入一個(gè)構(gòu)造-巖漿活化的新階段。

致謝:感謝中國(guó)地質(zhì)科學(xué)院地質(zhì)研究所任留東研究員檢查了巖石薄片;劉建峰、張維、周麗云博士對(duì)巖石地化數(shù)據(jù)和 U-Pb測(cè)年數(shù)據(jù)處理的指導(dǎo);宋彪研究員對(duì)鋯石 U-Pb測(cè)年數(shù)據(jù)處理的指導(dǎo)及對(duì)本文提出了建設(shè)性的修改意見。感謝中國(guó)地震局地質(zhì)研究所王艷楠同學(xué)對(duì)本文測(cè)試工作的幫助。感謝審稿專家提出的建議。

崔盛芹,李錦蓉,吳珍漢,易明初,沈淑敏,尹華仁,馬寅生.2002.燕山地區(qū)中新生代陸內(nèi)造山作用[M].北京:地質(zhì)出版社.

郭少豐,湯中立,羅照華,趙文浩.2009.冀東唐杖子、牛心山花崗巖體鋯石SHRIMP U-Pb定年及其地質(zhì)意義[J].地質(zhì)通報(bào),28(10):1458-1464.

河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì).1966.興隆幅、寶坻幅北部1/20萬(wàn)地質(zhì)圖說明書[R].廊坊:河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì).

河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì).1970.青龍幅 1/20萬(wàn)地質(zhì)圖說明書[R].廊坊:河北省地質(zhì)局區(qū)域地質(zhì)測(cè)量大隊(duì).

河北省地質(zhì)礦產(chǎn)局.1989.中華人民共和國(guó)地質(zhì)礦產(chǎn)部地質(zhì)專報(bào) 第 15號(hào) 河北省北京市天津市區(qū)域地質(zhì)志[M].北京:地質(zhì)出版社.

河北省區(qū)域地質(zhì)礦產(chǎn)勘查開發(fā)局.2000.承德市幅 1/25萬(wàn)區(qū)域地質(zhì)調(diào)查報(bào)告[R].石家莊:河北省區(qū)域地質(zhì)礦產(chǎn)勘查開發(fā)局.

胡玲,宋鴻林,顏丹平,胡道功.2002.尚義-赤城斷裂帶中糜棱巖40Ar/39Ar年齡記錄及地質(zhì)意義[J].中國(guó)科學(xué)(D輯),32(11):908-913.

李承東,張旗,苗來(lái)成,孟憲鋒.2004.冀北中生代高Sr低Y和低Sr低Y型花崗巖:地球化學(xué)、成因及其與成礦作用的關(guān)系[J].巖石學(xué)報(bào),20(2):269-284.

李海龍,張長(zhǎng)厚,鄒云,鄧洪菱,馬君.2008.冀東馬蘭峪背斜南翼與西部?jī)A伏端蓋層變形特征及其構(gòu)造意義[J].地質(zhì)通報(bào),27(10):1698-1708.

李強(qiáng),孟祥元,武峰,楊富全,劉鋒,張志欣.2012.河北省四撥子-六撥子鉬銅礦區(qū)侵入巖LA-ICP-MS鋯石U-Pb定年及成礦意義[J].礦床地質(zhì),31(2):255-270.

李秋生,高銳,張成科,趙金仁,管燁,張季生.2008.殘余殼根與“三明治”結(jié)構(gòu)—燕山造山帶中段地殼結(jié)構(gòu)的主要特征[J].地球?qū)W報(bào),29(2):129-136.

李伍平,李獻(xiàn)華.2004.燕山造山帶中段中晚侏羅世中酸性火山巖的成因及其意義[J].巖石學(xué)報(bào),20(3):501-510.

李伍平,趙越,李獻(xiàn)華,路鳳香,梁細(xì)榮,涂湘林.2007.燕山造山帶中—晚侏羅世髫髻山期(藍(lán)旗期)火山巖的成因及其動(dòng)力學(xué)意義[J].巖石學(xué)報(bào),23(3):557-564.

李小偉,莫宣學(xué),黃丹峰,徐曉彤,孟月玥.2010.河北興隆王坪石正長(zhǎng)花崗巖地球化學(xué)特征及成因研究[J].地質(zhì)學(xué)報(bào),84(5):682-693.

劉鳳山,石準(zhǔn)立.1998.太行山—燕山地區(qū)中生代花崗巖生成動(dòng)力學(xué)機(jī)制與陸內(nèi)造山作用[J].地球?qū)W報(bào),19(1):12-18.

劉紅濤,孫世華,劉建明,翟明國(guó).2002.華北克拉通北緣中生代高鍶花崗巖類:地球化學(xué)與源區(qū)性質(zhì)[J].巖石學(xué)報(bào),18(3):257-274.

陸繼龍,石厚禮,趙玉巖,郝立波,魏俏巧,趙新運(yùn).2012.冀東羅文峪花崗巖體LA-MC-ICP-MS鋯石U-Pb年齡及其地質(zhì)意義[J].吉林大學(xué)學(xué)報(bào)(地球科學(xué)版),42(S3):179-188.

羅鎮(zhèn)寬,關(guān)康,裘有守,苗來(lái)成,QIU Y M,MCNAUGHTON N J,GROVES D I.2001a.冀東金廠峪金礦區(qū)鈉長(zhǎng)巖脈及青山口花崗巖體SHRIMP鋯石U-Pb定年及其意義[J].地質(zhì)找礦論叢,16(4):226-231.

羅鎮(zhèn)寬,裘有守,關(guān)康,苗來(lái)成,QIU Y M,MCNAUGHTON N J,GROVES D I.2001b.冀東峪耳崖和牛心山花崗巖體SHRIMP鋯石U-Pb定年及其意義[J].礦物巖石地球化學(xué)通報(bào),20(4):278-285.

羅鎮(zhèn)寬,苗來(lái)成,關(guān)康,裘有守,QIU Y M,MCNAUGHTON N J,GROVES D I.2003.冀東都山花崗巖基及相關(guān)花崗斑巖脈SHRIMP鋯石 U-Pb法定年及其意義[J].地球化學(xué),32(2):173-180.

馬君.2009.冀東馬蘭峪隆起核部中生代中酸性侵入巖巖石地球化學(xué)特征及構(gòu)造意義[D].北京:中國(guó)地質(zhì)大學(xué).

馬寅生,曾慶利,宋彪,杜建軍,楊富全,趙越.2007.燕山中段盤山花崗巖體鋯石 SHRIMP U-Pb年齡測(cè)定及其構(gòu)造意義[J].巖石學(xué)報(bào),23(3):547-556.

牛寶貴,和政軍,宋彪,任紀(jì)舜.2003.張家口組火山巖SHRIMP定年及其重大意義[J].地質(zhì)通報(bào),22(2):140-141.

任紀(jì)舜,姜春發(fā),張正坤,秦德余.1980.中國(guó)大地構(gòu)造及其演化[M].北京:科學(xué)出版社:4-7.

任紀(jì)舜,陳廷愚,牛寶貴,劉志剛,劉鳳仁.1990.中國(guó)東部及鄰區(qū)大陸巖石圈的構(gòu)造演化與成礦[M].北京:科學(xué)出版社:6-9.

任紀(jì)舜,王作勛,陳炳蔚,姜春發(fā),牛寶貴,李錦軼,謝廣連,和政軍,劉志剛.1999.從全球看中國(guó)大地構(gòu)造——中國(guó)及鄰區(qū)大地構(gòu)造圖簡(jiǎn)要說明[M].北京:地質(zhì)出版社:14-18.

宋彪,喬秀夫.2008.遼北輝綠巖墻(床)群及二道溝組玄武巖鋯石年齡及其構(gòu)造意義[J].地學(xué)前緣,15(3):250-262.

王季亮,李丙澤,周德星.1994.河北省中酸性巖體地質(zhì)特征及其成礦關(guān)系[M].北京:地質(zhì)出版社.

王瑜.1994.中國(guó)東部?jī)?nèi)蒙—燕山地區(qū)晚古生代晚期—中生代的造山作用過程[D].北京:中國(guó)地質(zhì)科學(xué)院.

徐剛,趙越,高銳,李秋生,胡健民,劉曉文,吳海,楊富全,張拴宏,管燁,張季生,白金,匡朝陽(yáng),王海燕.2006.燕山褶斷帶中生代盆地變形—板內(nèi)變形過程的記錄——以下板城、承德-上板城、北臺(tái)盆地為例[J].地球?qū)W報(bào),27(1):1-12.

葉浩,張拴宏,趙越,吳飛.2014.燕山褶斷帶晚三疊世都山復(fù)式巖基成因及侵位變形:華北北緣中生代早期構(gòu)造背景的制約[J].地學(xué)前緣,21(4):275-292.

張長(zhǎng)厚,吳淦國(guó),王根厚,張維杰,宋鴻林.2004a.冀東地區(qū)燕山中段北西向構(gòu)造帶:構(gòu)造屬性及其年代學(xué)[J].中國(guó)科學(xué)(D輯),34(7):600-612.

張長(zhǎng)厚,吳淦國(guó),徐德斌,王根厚,孫衛(wèi)華.2004b.燕山板內(nèi)造山帶中段中生代構(gòu)造格局與構(gòu)造演化[J].地質(zhì)通報(bào),23(9):864-875.

張長(zhǎng)厚,李程明,鄧洪菱,劉陽(yáng),劉磊,魏波,李寒濱,劉孜.2011.燕山-太行山北段中生代收縮變形與華北克拉通破壞[J].中國(guó)科學(xué)(D輯),41(5):593-617.

趙麗君.2010.華北克拉通北緣早中生代巖體侵位與地殼變形——以盤山巖體周緣變形及年代學(xué)分析為例[J].地質(zhì)與勘探,46(1):102-112.

趙越,宋彪,張拴宏,馬寅生,裴軍令,楊振宇.2005.應(yīng)用鋯石SHRIMP U-Pb年齡確定燕山褶斷帶晚三疊世的構(gòu)造變形時(shí)代[C]//北京離子探針中心年報(bào)(2004).北京:地質(zhì)出版社:63-64.

趙越,張拴宏,徐剛,楊振宇,胡健民.2004.燕山板內(nèi)變形帶侏羅紀(jì)主要構(gòu)造事件[J].地質(zhì)通報(bào),23(9):854-863.

中國(guó)地質(zhì)大學(xué)(北京)地質(zhì)調(diào)查研究院.2004.青龍縣幅1/25萬(wàn)區(qū)域地質(zhì)調(diào)查報(bào)告[R].北京:中國(guó)地質(zhì)大學(xué)(北京)地質(zhì)調(diào)查研究院.

CUI Sheng-qin,LI Jin-rong,WU Zhen-han,YI Ming-chu,SHEN Shu-min,YIN Hua-ren,MA Yin-sheng.2002.Mesozoic and Cenozoic intracontinental orogenesis of the Yanshan area,China[M].Beijing:Geological Publishing House(in Chinese).

CHEN A.1998.Geometric and kinematic evolution of basement-cored structures:intraplate orogenesis within the Yanshan Orogen,northern China[J].Tectonophysics,292(1-2):17-42.

Geological Survey Institute of China University of Geosciences.2004.Report of regional geology of Qinglong(scale 1:250000)[R].Beijing:Geological Survey Institute of China University of Geosciences(in Chinese).

Geological Survey Team of Hebei Provice.1966.Report of regional geology of Xinglong and northern Baodi(scale 1:200000)[R].Langfang:Geological Survey Team of Hebei Provice(in Chinese).

Geological Survey Team of Hebei Provice.1970.Report of regional geology of Qinglong(scale 1:200000)[R].Langfang:Geological Survey Team of Hebei Provice(in Chinese).

GUO Shao-feng,TANG Zhong-li,LUO Zhao-hua,ZHAO Wen-hao.2009.Zircon SHRIMP U-Pb dating and geological significance from granite bodies in Tangzhangzi and Niuxinshan,eastern Hebei Province,China[J].Geological Bulletin of China,28(10):1458-1464(in Chinese with English abstract).

Hebei Bureau of Geology and Minerals.1989.Regional geology of Hebei Province,Beijing Municipality,and Tianjin Municipality Province[M].Beijing:Geological Publishing House(in Chinese).

Hebei Bureau of Geology and Mineral Resources Exploration.2000.Report of regional geology of Chengde(scale 1:250000)[R].Shijiazhuang:Hebei Bureau of Geology and Mineral Resources Exploration(in Chinese).

HU Ling,SONG Hong-lin,YAN Dan-ping,HU Dao-gong.2002.The40Ar/39Ar geochronology constraint and geological significance of mylonites in Shangyi-Chicheng fault belt on the north of North China Craton[J].Science in China (Series D),32(11):908-913(in Chinese).

LI Cheng-dong,ZHANG Qi,MIAO Lai-cheng,MENG Xian-feng.2004.Mesozoic high-Sr,low-Y and low-Sr,low-Y types granitoids in the northern Hebei province:Geochemistry and petrogenesis and its relation to mineralization of gold deposits[J].Acta Petrologica Sinica,20(2):269-284(in Chinese with English abstract).

LI Hai-long,ZHANG Chang-hou,ZOU Yun,DENG Hong-ling,MA Jun.2008.Tectonic deformations of the cover in the southern limb and western plunging zone of the Malanyu anticlinorium,eastern Hebei,China,and its tectonic implications[J].Geological Bulletin of China,27(10):1698-1708(in Chinese with English abstract).

LI Qiang,MENG Xiang-yuan,WU Feng,YANG Fu-quan,LIU Feng,ZHANG Zhi-xin.2012.LA-ICP-MS zircon U-Pb dating of intrusive rocks and its metallogenic significance in Sibozi-Liubozi molybdenum-copper deposit of Qinglong County,Hebei Province[J].Mineral Deposits,31(2):255-270(in Chinese with English abstract).

LI Qiu-sheng,GAO Rui,ZHANG Cheng-ke,ZHAO Jin-ren,GUAN Ye,ZHANG Ji-sheng.2008.Remainder Crustal Root and Decoupling-Main Characteristics of Crust Structure beneath the Yanshan Intracontinent Orogen[J].Acta Geoscientica Sinica,29(2):129-136(in Chinese with English abstract).

LI Shan,WANG Tao,WILDE S A,TONG Ying.2013.Evolution,source and tectonic significance of Early Mesozoic granitoid magmatism in the Central Asian Orogenic Belt (central segment)[J].Earth-Science Reviews,126(0):206-234.

LI Wu-ping,LI Xian-hua.2004.Petrogenesis and its implication for the middle-late Jurassic intermediate-acidic volcanic rocks in the middle section of Yanshan orogen[J].Acta Petrologica Sinica,20(3):501-510(in Chinese with English abstract).

LI Wu-ping,ZHAO Yue,LI Xian-hua,LU Feng-xiang,LIAO Xi-rong,TU Xiang-lin.2007.Genesis of the middle-later Jurassic volcanic rocks of Tiaojishan (Lanqi) period and its geodynamic implication,Yanshan Orogen,east China[J].Acta Petrologica Sinica,23(3):557-564(in Chinese with English abstract).

LI Xiao-wei,MO Xuan-xue,HUANG Dan-feng,XU Xiao-tong,MENG Yue-yue.2010.Geochemical characteristics and Origin of the Wangpingshi Syenogranite in Xinglong County,Hebei Provience[J].Acta Geologica Sinica,84(5):682-693(in Chinese with English abstract).

LIU Feng-shan,SHI Zhun-li.1998.Dynamic mechanism about Generation of Mesozoic Granites in Taihang Shan-Yan Shan Area and Intracontinental Orogeny[J].Acta Geoscientica Sinica,19(1):12-18(in Chinese with English abstract).

LIU Hong-tao,SUN Shi-hua,LIU Jian-ming,ZHAI Ming-guo.2002.The Mesozoic high-Sr granitoids in the northern marginal region of North China Craton:geochemistry and source region[J].Acta Petrologica Sinica,18(3):257-274(in Chinese with English abstract).

LU Ji-long,SHI Hou-li,ZHAO Yu-yan,HAO Li-bo,WEI Qiao-qiao,ZHAO Xin-yun.2012.LA-MC-ICP-MS Zircon U-Pb Dating of the Luowenyu Granite Intrusions and Its Geological Significance in Eastern Hebei Province[J].Journal of Jilin University(Earth Science Edition),42(S3):179-188(in Chinese with English abstract).

LUO Zhen-kuan,GUAN Kang,QIU You-shou,MIAO Lai-cheng,QIU Y M,MCNAUGHTON N J,GROVES D I.2001.Zircon SHRIMP U-Pb dating of albite dyke in Jinchangyu gold mine,jidong area,Hebei,China[J].Contributions to Geology and Mineral Resources Research,16(4):226-231(in Chinese with English abstract).

LUO Zhen-kuan,QIU You-shou,GUAN Kang,MIAO Lai-cheng,QIU Y M,MCNAUGHTON N J,GROVES D I.2001.SHRIMP U-Pb dating on ziron from Yu 'erya and Niuxinshan granite intrusions in eastern Hebei Province[J].Bulletin of Mineralogy Petrology and Geochemistry,20(4):278-285(in Chinese with English abstract).

LUO Zhen-kuan,MIAO Lai-cheng,GUAN Kang,QIU You-shou,QIU Y M,MCNAUGHTON N J,GROVES D I.2003.SHRIMP U- Pb zircon dating of the Dushan granitic batholith and related granite- porphyry dyke,eastern Hebei Province,China,and their geological significance[J].Geochimica,32(2):173-180(in Chinese with English abstract).

MA Jun.2009.Geochemical Characteristics and Mesozoic intermediate and felsic plutons in Malanyu Uplift,Estern Hebei Province,and its tectonic implications[D].Beijing:China University of Geosciences(in Chinese with English abstract).

MA Yin-sheng,ZENG Qing-li,SONG Biao,DU Jian-jun,YANG Fu-quan,ZHAO Yue.2007.SHRIMP U-Pb dating of zircon from Panshan granitoid pluton in Yanshan orogenic belt and its tectonic implications[J].Acta Petrologica Sinica,23(3):547-556(in Chinese with English abstract).

NIU Bao-gui,HE Zheng-jun,SONG Biao,REN Ji-shun.2003.SHRIMP dating of the Zhangjiakou volcanic series and its significance[J].Geological Bulletin of China,22(2):140-141(in Chinese).

NIU Bao-gui,HE Zheng-jun,SONG Biao,REN Ji-shun,XIAO Li-wei.2004.SHRIMP Geochronology of Volcanics of the Zhangjiakou and Yixian Formations,Northern Hebei Province,with a Discussion on the Age of the Xing'anling Group of the Great Hinggan Mountains and Volcanic Strata of the Southeastern Coastal Area of China[J].Acta Geologica Sinica,78(6):1214-1228.

REN Ji-shun,JIANG Chun-fa,ZHANG Zheng-kun,QIN De-yu.1980.Geotectonics of China and its evolution[M].Beijing:Science Press:4-7(in Chinese).

REN Ji-shun,CHEN Bing-wei,NIU Bao-gui,LIU Zhi-gang,LIU Feng-ren.1990.Tectonic evolution of the continental lithosphere and metallogeny in Eastern China and Adjacent Area[M].Beijing:Science Press:6-9(in Chinese).

REN Ji-shun,WANG Zuo-xun,CHEN Bing-wei,JIANG Chun-fa,NIU Bao-gui,LI Jin-yi,XIE Guang-lian,HE Zheng-jun,LIU Zhi-gang.1999.A view of geotectonics of China from globe:An explanation of geotectonic map of China and adjacent area[M].Beijing:Geological Publishing House:14-18.

SONG Biao,QIAO Xiu-fu.2008.Ages of the zircons from basalt of the Erdaogou Formation and diabase dyke warms in Northern Liaoning,and their significances.[J].Earth Science Frontiers,15(3):250-262(in Chinese with English abstract).

SUN S S,MCDONOUGH W F.1989.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes[J].Geological Society,London,Special Publication,42:313-345.

WANG Ji-liang,LI Bing-ze,ZHOU De-xing.1994.Geological characteristics and related mineralization of middle-acid complex in Hebei province[M].Beijing:Geological Publishing House(in Chinese).

WANG Yu.1994.Orogenic processes of the inner Mongolia-Yanshan area in Eastern China during the late Late Paleozoic-Mesozoic[D].Beijing:Chinese Academy of Geological Sciences(in Chinese with English abstract).

WANG Yu,ZHOU Li-yun,LI Jin-yi.2011.Intracontinental superimposed tectonics—A case study in the Western Hills of Beijing,eastern China[J].Geological Society of America Bulletin,123(5-6):1033-1055.

WANG Yu,ZHOU Li-yun,ZHAO Li-jun.2013.Cratonic reactivation and orogeny:An example from the northern margin of the North China Craton[J].Gondwana Research,24(3-4):1203-1222.

XU Gang,ZHAO Yue,GAO Rui,LI Qiu-sheng,HU Jian-min,LIU Xiao-wen,WU Hai,YANG Fu-quan,ZHANG Shuan-hong,GUAN Ye,ZHANG Ji-sheng,BAI Jin,KUANG Chao-yang,WANG Hai-yan.2006.Mesozoic basin deformation of Yanshan folded fault belt-records of the intraplate deformation process:a case study of Xiabancheng,Chengde-Shangbancheng and Beitai basins[J].Acta Geoscientica Sinica,27(1):1-12(in Chinese with English abstract).

YE Hao,ZHANG Shuan-hong,ZHAO Yue,WU Fei.2014.Petrogenesis and emplacement deformation of the Late Triassic Dushan composite batholith in the Yanshan fold and thrust belt:Implications for the tectonic settings of the northern margin of the North China Craton during the Early Mesozoic[J].Earth Science Frontiers,21(4):275-292(in Chinese with English abstract).

ZHANG Chang-hou,WU Gan-guo,WANG Gen-hou,ZHANG Wei-jie,SONG Hong-lin.2004a.Northwest trending tectonic belt in the middle Yanshan Orogenic Belt of northeast Hebei Province,North China:Tectonic evolution and geochronology[J].Science in China(Series D),34(7):600-612(in Chinese with English abstract).

ZHANG Chang-hou,WU Gan-guo,XU De-bin,WANG Gen-hou,SUN Wei-hua.2004b.Mesozoic tectonic framework and evolution in the central segment of the intraplate Yanshan orogenic belt[J].Geological Bulletin of China,23(9):864-875(in Chinese with English abstract).

ZHANG Chang-hou,LI Cheng-ming,DENG Hong-ling,LIU Yang,LIU Lei,WEI Bo,LI Han-bin,LIU Zi.2011.Mesozoic contraction deformation in the Yanshan and northern Taihang mountains and its implications to the destruction of the North China Craton[J].Science in China(Series D),41(5):593-617(in Chinese with English abstract).

ZHANG Shuan-hong,ZHAO Yue,DAVIS G A,YE Hao,WU Fei.2014.Temporal and spatial variations of Mesozoic magmatism and deformation in the North China Craton:Implications for lithospheric thinning and decratonization[J].Earth-Science Reviews,131(0):49-87.

ZHAO Li-jun.2010.Early Mesozoic Plutonic Intrusion and Crustal Deformation in the Northern Margin of North China Craton:A Case Study on Deformation Surrounding the Panshan Granitic Intrusion and its Chronological Analysis[J].Geology and Exploration,46(1):102-112(in Chinese with English abstract).

ZHAO Yue,SONG Biao,ZHANG Shuan-hong,MA Yin-sheng,PEI Jun-ling,YANG Zhen-yu.2005.An application of SHRIMP U-Pb age zircon geochronology to determine the age of tectonic deformation of the Late Triassic in the Yanshan fold and thrust belt[C]// Beijing SHRIMP Center annals(2004).Beijing:Geological Publishing House:63-64(in Chinese).

ZHAO Yue,ZHANG Shuan-hong,XU Gang,YANG Zhen-hong,HU Jian-min.2004.Major tectonic event in the Yanshanian intraplate deformation belt in the Jurassic[J].Geological Bulletin of China,23(9):854-863(in Chinese with English abstract).