地质科技情报２２０１８年陆块相邻南部以贺根山嫩江黑河缝合带为界１区域地质背景及岩石学特征与松嫩地块相接属于古亚洲洋构造域和滨太平洋构造域的叠加部位出露的地层主要有泥盆系大民研究区位于大兴安岭北段西坡

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1 GeologicalScienc0eandTechnologyInformation Vol.37 No.5 Sep doi: /j.cnki.dzkq ,,,. U-Pb [J].,2018,37(5): U-Pb 1, 1, 2 2 3, (1., ;2., ;3., ) : U-Pb, (w(sio 2 )=68.32%~70.62%), (w(na 2O+K 2O)=7.79% ~9.01%), CaO(0.89% ~2.51%) MgO (0.80%~1.30%) P 2O 5 (0.16%~0.23%) A/CNK A/NK 0.99~ ~1.42, -, ( LREE/ HREE=13.35~16.19), Eu Ce, K Rb Th Ba Sr LREE, U Ti La Ce, I LA-ICP-MSU-Pb, (303±2)Ma, Hf, εhf(t) (+9.20~+15.89), (T DM2 ) 700~500 Ma,, : ; U-Pb ; ; ; :X588.12;P597 :A : (2018) [14-16] - - -,, [1-6] [17-22],, -, [23-26] [27-28] [29-30] [31-32], [7-9],, - [10-12],,,,, [13],,,,,, : : : (QN ); (BQ ); (NMKD2013-7) : (1989 ),,, E- mail: @163.com : (1981 ),,, wangfang239@126.com

地质科技情报２２０１８年陆块相邻南部以贺根山嫩江黑河缝合带为界１区域地质背景及岩石学特征与松嫩地块相接属于古亚洲洋构造域和滨太平洋构造域的叠加部位出露的地层主要有泥盆系大民研究区位于大兴安岭北段西坡构造上属兴安地块北部以新林喜桂图缝合带为界与额尔古纳

2 地质科技情报２２０１８年陆块相邻南部以贺根山嫩江黑河缝合带为界１区域地质背景及岩石学特征与松嫩地块相接属于古亚洲洋构造域和滨太平洋构造域的叠加部位出露的地层主要有泥盆系大民研究区位于大兴安岭北段西坡构造上属兴安地块北部以新林喜桂图缝合带为界与额尔古纳山组海相火山沉积岩系石炭系红水泉组侏罗系满克头鄂博组玛尼吐组和白垩系伊敏组图１图１伊敏地区地质简图Ｆｉｇ１ＧｅｏｌｏｇｉｃａｌｓｋｅｔｃｈｏｆｔｈｅＹｉｍｉｎａｒｅａ本文所报道的黑云母二长花岗岩分布在东苇子坑塔尔巴干温多尔乌拉东南和阿贵特南以岩枝和小岩株状产出出露面积约７ｋｍ２岩石风化面为浅黄色新鲜面为灰色灰白色和浅肉红色具中细粒不等粒结构块状构造图２ａ岩石中常可见到大小不等的闪长质包体主要矿物组成 φｂ为斜长石３０５０钾长石３０４０石英２０３０黑云母２１０图２ｂ斜长石多为宽板状自形半自形柱状柱长０５３０ｍｍ以聚片双晶为主也见有卡钠复合双晶沿晶体边缘裂隙和中心常发生蚀变钾长石以微斜长石为主少量条纹长石板状粒径０５３０ｍｍ表面常见泥化而污浊轻微交代斜长石交代较强时斜长石可呈交代残留出现在钾长石晶体中石英多为它形粒状不规则粒状粒径在０２１０ｍｍ间黑云母具有浅绿浅黄色多色性以半自形片状或鳞片集合体产出鳞片长０１２０ｍｍ蚀变相对较强沿Ｂｉ黑云母Ｑ石英Ｐｌ斜长石Ｋｆｓ钾长石图２黑云母二长花岗岩岩石照片及显微照片Ｆｉｇ２Ｐｈｏｔｏｇｒａｐｈｓａｎｄｍｉｃｒｏｐｈｏｔｏｇｒａｐｈｓｏｆｂｉｏｔｉｔｅｍｏｎｚｏｎｉｔｉｃｇｒａｎｉｔｅ解理常见磁铁矿颗粒析出副矿物主要有锆石榍石磁铁矿等锆石为自形短柱状柱长０１ｍｍ多作为子矿物被包裹在长石或石英晶体中磁铁矿自形粒状粒径００２０１５ｍｍ沿晶间分布而由

5 : U-Pb 3 206 Pb/ 238 U 306~300 Ma,19, ; ( 4), 206 Pb/ 238 U (303±2)Ma(MSWD=0.14), 2 X, AB-104L,PW2404X X, GB/T14506.14-2010 14 :,GB/T 14506.28-2010 28 :16 ELE- MENT XR, GB/T14506.

3 5 : U-Pb Pb/ 238 U 306~300 Ma,19, ; ( 4), 206 Pb/ 238 U (303±2)Ma(MSWD=0.14), 2 X, AB-104L,PW2404X X, GB/T :,GB/T :16 ELE- MENT XR, GB/T , U-Pb Lu-Hf 4 U-Pb, FinniganNeptune MC-ICP- Fig.4 ConcordiaU-Pbplotsofzircons MS Newwave UP213 ICPMSDataCal [33] Iso- 4 plot [34], 206 Pb/ 238 U 95% U-Pb 2 :w(sio 2 ), 68.32% ~ 70.62%, 69.53%, ;w(na 2O), 80~ 4.09%~5.38%,w(K 2O) 3.32%~3.74%, 220μm, 1.2 1~4 1 (w(na 2O+K 2O)=7.79% ~, 9.01%) σ 2.20~3.21,, ( 3) w(u) 3.3,, ~ ,w(Th) ~399 w(k 2O)-w(SiO 2 ) ( 5-a) 10-6,Th/U 0.28 ~ 0.99 ( 1) w (Al 2O 3 )(15.04% ~ 15.79%, 15.41%) 15.02% [35],,A/ CNK A/NK 0.99~ ~ 1.42, A/NK-A/CNK ( 5-b) -, w(cao)(0.89%~ 2.51%, 2.16% ) w(p 2O 5 )(0.16% ~ 0.23%, 0.19%) w(mgo)(0.80%~1.30%, 1.02%) 4.2 ( 3) ( 6-a) : K, 3 Rb( ~ , Fig.3 ThepartialCLimagesofzircons 10-6 ) Ba( ~ , 593

4 LA-ICP MSU-Pb Table1 LA-ICP MSU-Pbdataofzirconsofbiotitemonzoniticgranite Pb Th U Th/ t/ma / w B /10-6 U Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ % TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW Table2 Majorelementscompositionsofbiotitemonzonitic Table3 Traceelementscompositionsofbiotitemonzonitic granite granite w B /10-6 TW2066-1XT2066-2XT2066-3XT2065-2XT2065-3Pm SiO TiO Al2O Fe2O MnO MgO CaO Na2O K2O P2O FeO K2O/Na2O A/CNK ALK A/NK σ Mg # : %;σ= [(Na2O+K2O) 2 ]/[SiO2-43%];Mg # =Mg 2+ /(Mg 2+ +TFe 2+ );A/CNK=Al2O3/(CaO+ Na2O+K2O);A/NK=[Al2O3/(Na2O+K2O) 10-6 ) Sr( ~ , ) Th( ~ , ), U( ~ TW2066-1XT2066-2XT2066-3XT2065-2XT2065-3Pm Li Be Sc V Cr Co Ni Cu Zn Ga Rb Sr Mo Cd In Sb Cs Ba W Re Tl Pb Bi Th U

5 5 : U-Pb 5 5 w(k 2O)-w(SiO 2 ) (a) A/NK-A/CNK (b)(a [36];b [37]) Fig.5 K 2O-SiO 2 (a)anda/nk-a/cnk (b)diagramsofbiotitemonzoniticgranite 6 (a) [38]) (b)( , ) Ti( ~ , ) La( ~ , ) Ce ( ~ , ) HREE LREE,(La/ Sm) N 3.13~3.88, 3.56;,(Gd/Yb) N 1.86~2.83, 2.17 δeu 0.75~0.87, Fig.6 Primitivemantle-normalizedtraceelementsspiderdiagram (a)andchondrite-normalizedreepaternsdiagram (b)ofbiotitemonzonit- icgranite 0.81,δCe 0.81~0.97, 0.91, 4.3 Eu Ce 4, 4.4 Hf 6-b (TW b : 1) 19 Hf,,w( REE) ( 5) : 176 Hf/ 177 Hf ~ ( ~ , ,εHf(t) +9.20~ ), ( LREE/ ( 7-a), T DM2 729~302 Ma, HREE 13.35~16.19, 14.55;(La/Yb) N 700~500 Ma( 7-b) 18.81~22.53, 19.93),LREE,

6 Fig.7 7 Hf (a) T DM2 (b) HfisotopeevolutiondiagramandT DM2distributionfrequencydiagram 4, Table4 Rareearthelementscompositionsofbiotitemonzo-, niticgranite w (SiO 2 )(68.32% ~70.62%) TW2066-1XT2066-2XT2066-3XT2065-2XT2065-3Pm w(na La O)(4.09% ~5.38%) w(k 2O)(3.32% ~ Ce %) TFeO/MgO (2.24~2.65), Pr K 2O/Na 2O 0.67~0.91,A/CNK Nd ~1.08, Sm <1%, I, Eu Gd ( 8) I Tb Dy w(sio 2 ) Ho , Er [44-45] Tm w(sio 2 ), Yb P 2O 5 SiO 2 Lu w(p 2O 5 )-w(sio 2 ) ( 9), w(p 2O 5 ) Y w(sio ΣREE ), I LREE Y Th HREE Rb, I LREE/HREE (La/Yb) N , (La/Sm) N (Gd/Yb) N δeu δce : , A I U-Pb, 5.1,Th/U 0.28~0.99, 206 Pb/, 238 U 306~300 Ma,19

7 5 : U-Pb 7, 206 Pb/ 238 U (303±2)Ma(MSWD=0.14), Hf, εhf(t) (+9.20~+15.89), 7-a ( LA- εhf(t) εhf(t), ICP-MSU-Pb 304 Ma ) [30], ( SHRIMP U-Pb, Hf Hf (299±3)Ma) [46] ( LA- 729~302 Ma, ICP-MSU-Pb (304±2.2)Ma) [47], 700~500 Ma ( 7-b),, 5 Hf Table5 LA-ICP-MCzirconLu-Hfcompositionsofthebiotitemonzoniticgranite t/ma 176 Yb/ 177 Hf 176 Lu/ 177 Hf 176 Hf/ 177 Hf 2σ ( 176 Hf/ 177 Hf) iεhf(0) εhf(t) TDM1/Ma flu/hf TDM2/Ma TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW TW :εhf(0)=(( 176 Hf/ 177 Hf) S /( 176 Hf/ 177 Hf) CHUR,0-1) 10000;εHf(t)= (( 176 Hf/ 177 Hf) S- ( 176 Lu/ 177 Hf) S (e λt -1))/(( 176 Hf/ 177 Hf) CHUR,0-( 176 Lu/ 177 Hf) CHUR,0 (e λt -1))-1) 10000;TDM1=1/λ ln(1+ (( 176 Hf/ 177 Hf) s- ( 176 Hf/ 177 Hf) DM )/(( 176 Lu/ 177 Hf) S- ( 176 Lu/ 177 Hf) DM ));TDM2=TDM1-(TDM-t)(fCC-fS)/(fCC-fDM);fLu/Hf=( 176 Lu/ 177 Hf) S /( 176 Lu/ 177 Hf) CHUR-1;( 176 Lu/ 177 Hf) CHUR,0= ,( 176 Hf/ 177 Hf) CHUR,0= [39];( 176 Lu/ 177 Hf) DM=0.0384,( 176 Hf/ 177 Hf) DM= , [40];λ= a -1 [41]; 176 Lu/ 177 Hf=0.015 [42] 8 Fig.8 w(na 2O)-w(K 2O) ( [43]) Na 2O-K 2Odiagenesisdiagramofbiotitemon- zoniticgranite, TFeO/MgO (2.24~2.65) R1 (1631~2229) R2 (461~642), ( 10-a), ; TFeO/(TFeO+ MgO)- w(sio 2 ) ( 10-b), POG,,, [49-50]

8 w(sio 2 )-w(p 2O 5 ) Fig.9 P 2O 5-SiO 2diagramofbiotitemonzoniticgranite (1) -, K Rb Th Ba Sr, U Ti La Ce, I (2) U-Pb, 206 Pb/ 238 U 306~300 Ma, 206 Pb/ 238 U (303±2)Ma, (3) εhf(t) +9.20~+15.89, T DM2 729~302Ma, 700~500Ma,, 10 R1-R2 (a) TFeO/[TFeO +MgO]-w(SiO 2 ) (b)(a [48];b [37]) Fig.10 R1-R2discriminationdiagram (a)andtfeo/(tfeo+ MgO)-SiO 2diagram (b)forbiotitemonzoniticgranite : [1],,. [J].,2005,50(12): [2],,,. [J].,2010,37(4): [3],,, [M]. :,1998. [4],,,. - [J].,2006,33(4): [5],,,. [J].,2011,31( 1): [6],,,. [J].,2013,48(1): [7] LiJY.PermiangeodynamicsetingofNortheastChinaandad- jacentregions:closureofthepaleo-asian Oceanandsubduc- tionofthepaleo-pacificplate[j].journalofasianearthsci- ences,2006,26(3/4): [8] SengorA M C.PaleotectonicsofAsia:Fragmentsofasynthe- sis[j].journalofthetectonicevolutionofasia,1996,32(6): [9]. : [M]. :,2000. [10]Xu W L,JiW Q,PeiFP,etal.Triassicvolcanismineastern HeilongjiangandJilinprovinces,NE China:Chronology,geo- 1. ;2. ;3. ;4. ;5. chemistry,andtectonicimplications[j].journalofasianearth ;6. ;7. ;IAG. ;CAG. Sciences,2009,34(3): ;CCG. ;POG. ;RRG. [11]Xu W L,PeiFP,WangF,etal.Spatial-temporalrelationships ;CEUG. ofmesozoicvolcanicrocksinnechina:constraintsontectonic overprintingandtransformationsbetweenmultipletectonicre- gimes[j].journalofasianearthsciences,2013,74(3): [12]YuJJ,WangF,Xu W L,etal.EarlyJurassicmaficmagmatism inthelesserxing an-zhangguangcairange,nec China,and itstectonicimplicationsformzircon U-Pbchronologyandits

9 5 : U-Pb 9 tectonicimplications:constraintsformzirconu-pbchronology andgeochemistry[j].journaloflithos,2012,142(3): [15],,,. [J]. 51(1/2): ,1995,69(1): [16]. [J].,1996,15(3/ 4): [17],,. [35]. [M]. :,1987. LA-ICP-MS U-Pb [J]., [36]PecceriloA,TaylorSR.GeochemistryofEocenecalc-alkaline 2017,50(4): volcanicrocksfromthekastamonuarea,northernturkey[j]. [18]. JournalofContributionsto MineralogyandPetrology,1976,58 [D]. : ( ), (1): [19],,,. [J].JournalofGeologicalsocietyofAmericaBuletin,1989, U-Pb [J].,2014,30 101(5): (7): [20],,,. ~330 Ma oceanic basalts:implications for mantle composition and - [J]., processes[j].journalof GeologicalSociety,London,Special 2014,30(7): Publications,1989,42(1): [21],,,. - I A Nd [J]., ofchondritesandtheevolutionofthemantle-crustsystem[j]. 2014,30(7): JournalofEarthandPlanetaryScienceLeter,1997,148(1/2): (1): [31]ChenB,JahnB,WildeS,etal.TwocontrastingPaleozoicmag- [13],,,. [33]LiuY,GaoS,HuZ,etal.Continentalandoceaniccrustrecy- [J].,2015,89(2): cling-induced melt-peridotiteinteractionsinthe Trans-North [14]. [J]. ChinaOrogen:U-Pbdating,Hfisotopesandtraceelementsin,1989,3(2): zirconsfrom mantlexenoliths[j].journalofpetrology,2010, [22],,, U-Pb [J]., [40]Grifin W L,PearsonNJ,BelousovaE,etal.TheHfisotope 2014,41(3): compositionofcratonicmantle:la-mc-icpmsanalysisofzi- [23],,,. ronicmegacrystsinkimberlites[j].geochimicaetcosmochimi- [J].,2013,32 caacta,2000,64(1): [24],,,. constantdeterminedbylu-hfandu-pbisotopesystematicof [J].,2009,25(10): Precambrianmaficintrusions[J].JournalofEarthandPlaneta [25],,,. - [42]Grifin W L,WangX,JacksonSE,etal.Zirconchemistryand [J]. :,2008,38(5): magma mixing,se China:In-situ analysisof Hfisotopes, [26],,,. 2002,61(3/4): [J].,2005,21 [43] Wolf M B,London D.Apatitedissolutionintoperaluminous (3): haplograniticmelt:anexperimentalstudyofsolubilitiesand [28],,,. : U-Pb Sr-Nd-Hf LA-ICP-MSU-Pb [J]., [J]. :,2009,30(7): ,26(8): [29],,,. ofa-typegranites with particularreferencetosoutheastern : [J]. Australia[J].JournalofContributionsto MineralogyandPe-,2013,87(9): trology,1982,80(2): [30],,,. [46],,,. [J].,2013, [J].,2013,32( 1): (9): [27],,,. mechanisms[j].journalofgeochimicaetcosmochimicaacta, : [J].,2010,26(11): ,58(19): maticbeltsin northerninner Mongolia,China:Petrogenesis andtectonicimplications[j].tectonophysics,2000,328(1/2): [32],,,. - SHRIMP [J].,2003,48 (22): [34]LudwigK R.User'smanualforisoplot3.00,ageochronlogical toolkitformicrosoftexcel[j].journalofberkeleygeochronl. Cent.SPEC.Publ.,2003,4(1/2): [37]ManiarPD,PiccoliP M.Tectonicdiscriminationofgranitoids [38]SunSS,McDonough W F.Chemicalandisotopicsystematicof [39]Blichert-ToftJ,AlbarèdeF.TheLu-Hfisotopegeochemistry [41]S derlundu,patchetpj,vervoortjd,etal.the 176 Ludecay ryscienceleters,2004,219(3): TongluandPintanigneouscomplexes[J].JournalofLithos, [44],,,. I [45]ColinsWJ,BeamsSD,WhiteAJR,etal.Natureandorigin [47]. [D]. :,2011. [48]BatchelorR A,BowdenP.Petrogeneticinterpretationofgran- itoidrockseriesusing multicationicparameters[j].journalof ChemicalGeology,1985,48(1/4):43-55.

10 [49]. [M]. [50]. [M]. : :,1991.,1996. ZirconU-PbDatingandGeologicalSignificanceofthe BiotiteMonzoniticGranitefrom YiminAreainInnerMongolia Hu Hongfei 1,WangFang 1,ZangJinqian 2,LiuFeng 2,CheYan an 3 (1.HebeiGEO University,Shijiazhuang050031,China;2.ShandongInstituteof Geophysical& GeochemicalExploration,Jinan250013,China; 3.The4thGeologyBrigadeofHebeiProvinceBureauofGeology & Mineral, ChengdeHebei067000,China) Abstract:Thispaperreportsthezircon U-Pbgeochronologicalandpetrogeochemicaldataofthebiotite- monzoniticgranitein Yiminareaforthefirsttime.AnalysisresultsshowthatYiminbiotite monzonitic granitehasthegeochemicalcharacteristicsofhighsilica (68.32% %),alkalirich (Na 2O+K 2O= 7.79%-9.01%),andpoorin CaO(0.89% -2.51%),MgO(0.80% -1.30%)andP 2O 5 (0.16% %).ThevaluesofA/CNKandA/NKarebetween and respectively,belong- ingto metaluminous-peraluminouscalc-alkaline series.the contents ofthetotalrare earth elements ( REE)inbiotitemonzoniticgranitearelow,withremarkablefractionationbetweenlightrareearthele- mentsandheavyrareearthelements( LREE/ HREE= ),butwithnoobviousEuandCe anomalies.thetraceelementcontentsdisplayenrichmentink,rb,th,ba,srandlree,relativelydeple- tedinu,ti,laandce.withaltheabovegeologicalfeatures,thebiotitemonzoniticgranitehasthecharac- teristicsofi-typegranite.zirconla-icp-ms U-Pbdatingresultssuggestthatthegranitewasformedat (303.3±2)Ma,whichwasaproductofLateCarboniferousmagmatism.Hfisotopicdatashowthatithas highεhf(t)values(+9.20to+15.89),thecorrespondingtwostagemodelages(t DM2 )clusteredin Ma.Thisreflectstheoriginofthebiotite monzoniticgranite magma wasderivedfrom thecrustal growthinneoproterozoic.thebiotitemonzoniticgranitewasformedinthepost-colisionextensionenvi- ronmentofxing anblockandsongnenblock. Keywords:biotitemonzoniticgranite;zirconU-Pbage;LateCarboniferousperiod;geochemistry;Yimin area

GeologicalScienceandTechnologyInformation Vol.37 No.3 May 2018 doi: /j.cnki.dzkq ,,,. [J].,2018,37(3):13-20.,,, (, )

37 3 2018 5 GeologicalScienceandTechnologyInformation Vol.37 No.3 May 2018 doi:10.19509/j.cnki.dzkq.2018.0302,,,. [J].,2018,37(3):13-20.,,, (, 510080) : SN NWW U-Pb (148.6±4.1)Ma(MSWD=1.3) (85.7±2.0)Ma(MSWD=1.4)