1 : - - U-Pb 35 3 (CL) Fig.3 Cathodoluminescence(CL)imagesofzircongrainsfromtheJitoupluton 1600, : 15kV, 7 10-8 A, 1μm, ZAF Isoplot/Ex ver3 [9] [7] Fe 2+ Fe 3+ 2.2.2 U-Pb 3.1, 3.1.1, 150, ( 2-a,b),,, 0.5~2mm U-Pb 1, ( 4), (LA-ICP-MS),, NISTSRM612, (REE,U,Th,Pb) 3 RSD<3% ; :15~20s,40s,45~55s ; 5~10 ( ) Plesovice SL ; NISTSRM 612, 29Si GLITTER ver4.0, Ander- 4 son [8] ComPbCorr# 3.17,U-Pb Fig.4 Classificationdiagramofplagioclaseinthequartzdiorite
36 2017 An,,,,, 2, w(na 2O), w(cao),(ca B+Na B ) 1.34(B 3.1.2 ),Na B<0.67,,, 1mm, ( 5-a) 1 Table1 Compositionandcalculationresultofplagioclaseinthequartzdiorite 008-2( ) 017-017- 3-2 4-2 056-1( ) 056-2( ) 060-2 068-2 072-2 090-2 SiO2 56.76 57.08 64.28 56.86 60.85 53.69 58.55 58.51 63.32 56.21 51.87 58.37 61.94 55.86 56.72 56.69 57.29 Al2O3 25.18 26.27 21.77 25.45 23.81 27.69 25.72 24.06 21.41 26.76 29.35 25.59 22.30 26.40 25.95 25.73 25.65 CaO 9.28 9.89 4.59 9.58 7.41 11.05 8.56 7.62 3.99 11.27 14.80 8.62 5.09 10.65 10.85 9.50 9.90 Na2O w B /% 6.72 6.65 9.57 6.39 7.71 6.07 7.10 7.45 9.55 5.80 3.94 7.25 8.61 6.09 6.09 6.69 6.37 K2O 0.34 0.32 0.38 0.42 0.37 0.30 0.43 0.54 0.43 0.21 0.16 0.43 0.74 0.38 0.32 0.29 0.41 Si 2.59 2.56 2.83 2.59 2.71 2.46 2.61 2.67 2.84 2.53 2.36 2.61 2.79 2.53 2.56 2.58 2.58 Al 1.35 1.39 1.13 1.36 1.25 1.49 1.35 1.29 1.13 1.42 1.57 1.35 1.18 1.41 1.38 1.38 1.36 Ca n 0.45 0.47 0.21 0.46 0.35 0.54 0.41 0.37 0.19 0.54 0.72 0.41 0.24 0.51 0.52 0.46 0.47 Na 0.59 0.58 0.81 0.56 0.66 0.54 0.61 0.65 0.83 0.50 0.34 0.62 0.75 0.53 0.53 0.59 0.55 K 0.01 0.01 0.02 0.02 0.02 0.01 0.02 0.03 0.02 0.01 0.00 0.02 0.04 0.02 0.01 0.01 0.02 An 42.48 44.34 20.53 44.26 33.99 49.35 39.05 35.04 18.32 51.19 66.91 38.74 23.62 48.14 48.76 43.28 45.17 Ab 55.67 53.95 77.45 53.43 63.99 49.06 58.61 62.00 79.33 47.67 32.23 58.96 72.29 49.81 49.53 55.15 52.60 Or 1.85 1.71 2.02 2.31 2.02 1.60 2.34 2.96 2.35 1.14 0.86 2.30 4.09 2.05 1.71 1.57 2.23 :An. ;Ab. ;Or. ; 2 Schmidt [10] P = Table2 Compositionandcalculationresultofamphibolein thequartzdioriteandinclusionsofjitoupluton -3.01+4.76Al T, 204~563MPa, 3 : 19km 017-017- 100-1 008-1 066-3 068-1 068-3 096-1, 11~15km 3-1 4-1 ( ) SiO2 43.89 45.20 46.91 43.32 43.99 42.95 42.81 41.45, 7~8km TiO2 2.80 2.23 2.19 2.87 2.76 3.54 3.01 0.77 Al2O3 9.33 6.96 6.83 9.33 9.54 9.71 9.71 13.36,, FeO 13.92 14.79 13.31 13.93 13.84 13.57 14.07 12.94 MnO w B /% 0.45 0.52 0.56 0.48 0.42 0.32 0.53 0.47 ( 5-b) MgO 11.65 12.18 13.21 11.49 11.81 11.74 11.72 12.49, CaO 11.69 11.67 11.59 12.10 11.92 11.39 11.67 12.33, - Na2O 2.82 2.12 2.16 2.86 2.63 2.62 2.74 2.77 K2O 1.11 0.77 0.76 1.04 1.12 1.11 1.07 1.18 An=34~49, 92; Si T 6.56 6.83 6.93 6.51 6.54 6.45 6.44 6.18 Si=6.45~6.93, 7.8 Blun- Al Ⅳ 1.43 1.16 1.06 1.48 1.45 1.54 1.55 1.81 dy [11] Al Ⅵ 0.20 0.07 0.12 0.16 0.21 0.17 0.16 0.53 Ti n 0.31 0.25 0.24 0.32 0.30 0.40 0.34 0.08 Fe 3+ 0.18 0.32 0.39 0.14 0.20 0.23 0.14 Fe 2+ 1.55 1.54 1.24 1.60 1.51 1.47 1.62 1.61 CaB 1.87 1.89 1.84 1.95 1.90 1.84 1.88 1.93 NaB 0.13 0.10 0.16 0.05 0.10 0.17 0.12 2.77 NaA 0.69 0.53 0.46 0.78 0.66 0.60 0.68 0.80 KA 0.21 0.15 0.14 0.20 0.21 0.21 0.21 0.22 /MPa 383.68253.06203.99 408 391.25432.99440.61563.46 /km 12.6618.35116.731613.46412.91114.289 14.54 18.594 : Al Ⅳ Al Ⅵ, A,B,T T= 0.677P-48.98+Y -0.0429-0.008314lnK ( ) :K= Si-4, Si 8-Si XAb Si ;P MPa, ;X Ab Ab, X Ab>0.5,Y=0; X Ab<0.5,Y= -8.06+ 25.5(1-X Ab ) 2, 725.54 ~849.61 ( 3)
1 : - - U-Pb 37 5 ( [12])(a) w(tio 2 )-w(al 2O 3 )(b) (A,B ) Fig.5 Classificationmapforamphibole(a)andTiO 2-Al 2O 3 (b)diagramofamphibole 3 282.87 10-6,U Th Th/U, 0.67~1.20( 4), Table3 Compositionandcalculationresultoftheplagio- claseassociatedwithamphiboleinthejitoupluton [13], U Th, 16 008-2-1 017-3-2 017-4-2 068-2 206 Pb/ 238 U 146~137 Ma( 4), SiO2 56.76 56.86 60.85 56.72 Al2O3 25.18 25.45 23.81 25.95, ( 6-a), Pb/ 238 U CaO w B /% 9.28 9.58 7.41 10.85 (141.6±1.1)Ma(MSWD=0.79), Na2O 6.72 6.39 7.71 6.09 K2O 0.34 0.42 0.37 0.32 XQ- Si 2.5991 2.5928 2.7128 2.5629 Al 1.3589 1.3678 1.2511 1.3819 TW4 20 Ca n 0.4553 0.4681 0.3540 0.5253 Na 0.5966 0.5650 0.6664 0.5335 K 0.0199 0.0244 0.0210 0.0184 An 42.48 44.26 33.99 48.76 Ab 55.67 53.43 63.99 49.53 Or 1.85 2.31 2.02 1.71 t/ 808.60 776.62 725.54 849.61 U-Pb 20 3.2, ( 6-b), 206 Pb/ 238 U XQ-TW2 16 (129.95±0.6)Ma(MSWD=1.8), ( 3), U Th 62.86 10-6 ~236.19 10-6,41.82 10-6 ~ ( 3), U Th 301.34 10-6 ~731.49 10-6,151.17 10-6 ~707.77 10-6,Th/U, 0.501659~1.158336 ( 4), 20 206 Pb/ 238 U 134~127.5 Ma( 4), 6 XQ-TW2(a) XQ-TW4(b)U-Pb Fig.6 ZirconU-PbconcordiadiagramfortheJitoupluton (XQ-TW2 (a)andxq-tw4 (b))inxinqiao
38 2017 232 Th 238 U w B /10-6 4 LA-ICP-MS Table4 LA-ICP-MSzirconU-PbdatingresultsoftheJitouplutoninXinqiao Th/U t/ma 207 Pb/ 206 Pb 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 207 Pb/ 235 U 1σ 206 Pb/ 238 U 1σ 1 66.26 70.32 0.942264 0.04873 0.00412 0.14805 0.00235 0.02204 0.00028 140 2 141 2 2 77.99 79.30 0.983480 0.04888 0.00117 0.15038 0.03116 0.02232 0.00040 142 28 142 3 3 69.03 78.82 0.875793 0.04870 0.0034 0.14802 0.01017 0.02205 0.00026 140 9 141 2 4 61.27 76.24 0.803646 0.04915 0.00126 0.14617 0.03736 0.02157 0.00054 139 33 138 3 5 282.87 236.19 1.197637 0.04893 0.00125 0.14812 0.02178 0.02196 0.00039 140 19 140 2 6 61.12 82.43 0.741478 0.04884 0.00377 0.14790 0.01125 0.02197 0.00026 140 10 140 2 7 41.82 62.86 0.665288 0.04881 0.00636 0.15116 0.00953 0.02247 0.00035 143 8 143 2 8 51.69 65.32 0.791335 0.04882 0.00453 0.14951 0.01364 0.02222 0.00036 141 12 142 2 9 101.66 101.95 0.997155 0.04898 0.00517 0.14803 0.00547 0.02193 0.00028 140 5 140 2 10 68.28 91.31 0.747782 0.04889 0.00399 0.15096 0.00216 0.02240 0.00027 143 2 143 2 13 91.80 96.50 0.951295 0.04884 0.00401 0.15098 0.00822 0.02243 0.00028 143 7 143 2 15 93.28 140.71 0.662924 0.04874 0.00493 0.15166 0.01517 0.02258 0.00031 143 13 144 2 16 57.44 78.10 0.735467 0.04889 0.00658 0.15404 0.00749 0.02286 0.00048 145 7 146 3 17 60.47 76.11 0.794508 0.04888 0.00416 0.15064 0.01266 0.02236 0.00030 142 11 143 2 18 212.44 182.13 1.166420 0.04882 0.00732 0.14690 0.00159 0.02183 0.00067 139 1 139 4 19 76.73 103.77 0.739424 0.04891 0.00108 0.14530 0.00212 0.02155 0.00055 138 2 137 3 1 275.22 512.92 0.536575 0.04860 0.00147 0.13449 0.00386 0.02007 0.00014 128 3 128.1 0.9 2 506.76 623.88 0.812272 0.04859 0.00123 0.13433 0.00318 0.02005 0.00014 128 3 128 0.9 3 409.14 577.44 0.708541 0.04864 0.00134 0.13639 0.00353 0.02034 0.00015 130 3 129.8 0.9 4 314.31 492.56 0.638115 0.04864 0.00148 0.13617 0.00390 0.02031 0.00016 130 3 130 1 5 706.77 610.16 1.158336 0.04862 0.00162 0.13569 0.00431 0.02024 0.00016 129 4 129 1 6 247.19 362.75 0.681433 0.04868 0.00163 0.14089 0.00448 0.02099 0.00018 134 4 134 1 7 347.20 582.26 0.596297 0.04865 0.00138 0.13687 0.00366 0.02041 0.00014 130 3 130.2 0.9 8 487.29 731.49 0.666161 0.04860 0.00117 0.13589 0.00300 0.02028 0.00015 129 3 129.4 0.9 9 230.26 362.12 0.635867 0.04867 0.00169 0.13935 0.00463 0.02077 0.00017 132 4 133 1 10 300.93 456.82 0.658750 0.04860 0.00142 0.13382 0.00368 0.01998 0.00015 128 3 127.5 0.9 11 519.05 666.08 0.779261 0.04860 0.00107 0.13476 0.00270 0.02011 0.00014 128 2 128.4 0.9 12 331.10 521.11 0.635374 0.04867 0.00118 0.13701 0.00305 0.02042 0.00014 130 3 130.3 0.9 13 323.62 531.91 0.608411 0.04867 0.00116 0.14067 0.00309 0.02097 0.00015 134 3 133.8 0.9 14 184.18 301.69 0.610494 0.04867 0.00153 0.13826 0.00413 0.02061 0.00016 131 4 132 1 15 272.99 487.89 0.559532 0.04860 0.00124 0.13535 0.00319 0.02020 0.00015 129 3 128.9 0.9 16 395.12 296.02 1.334775 0.04862 0.00156 0.13491 0.00411 0.02013 0.00016 129 4 128 1 17 307.54 461.42 0.666508 0.04862 0.00121 0.13689 0.00314 0.02043 0.00015 130 3 130.4 0.9 18 275.94 520.91 0.529727 0.04860 0.00127 0.13698 0.00332 0.02045 0.00015 130 3 130.5 0.9 19 231.39 412.55 0.560877 0.04860 0.00173 0.13588 0.00463 0.02028 0.00015 129 4 129.4 0.9 20 151.17 301.34 0.501659 0.04862 0.00156 0.13818 0.00422 0.02062 0.00016 131 4 132 1 4 (143±1)Ma, 206 Pb/ 238 U 139 Ma [15], 4.1 (141.0±1.1)Ma [16], (141.6 140 Ma ±1.1)Ma 206 Pb/ 238 U, 4.2,, [17-23] [14] (140.4+2.2)Ma, (129.95±0.6)Ma 206 Pb/ 238 U,, 2 (141.3±9.2)Ma (133.3±3.2)Ma [15],,,, 206 Pb/ 238 U ( 2),
1 : - - U-Pb 39 U-Pb (141.6±1.1)Ma, ( 5-b), LA-ICP-MS U-Pb (129.95±0.6)Ma, [6,14,23-24] [21], 2, 141 Ma 204~ (2) 800, 13 563 MPa, 6.7~18.6km, ~15km,,, 725.54~849.61 ( 3), 7~8km, : 800, (3)2, 13~15km, [18-19],, 7~8km,, 4.3 :, [1],,,. [M]. :,1998., [2],. :, [J].,1983,2(1):11-20. [3],,,., [J].,2001,30(2):58-61. [4],,. ( ) [25] [J].,2010(8):112-115. [5],,,. He Ar Re-Os, [J].,2004,18(4):524-528. (126±1.1)Ma,, 2 (129.9±0.6)Ma [26], Re-Os 1680. (138±26)Ma, (141.6±1.1)Ma [27], Rb-Sr 113 Ma,,, 2 79., [28] 140~110 Ma, δ 34 S, gycenter,2003.,, (2/3):304-310., 207 Pb/ 204 Pb 15.468~15.762, 207 Pb/ 204 Pb,, Mineralogist,1978,16(4):501-520., [13],, [J]., [14],, 5 (1) LA-ICP-MS [6],,,. [J].,2013,23(6):1666- [7]. Fe3 Fe2[J]., 1983,3(1):55-63. [8] AndersonT.CorrectionofcommonPbin U-Pbanalysesthat donotreport 204 Pb[J].ChemicalGeology,2002,192(1/2):59- [9] LudwigK R.Isoplot3.00:AgeochronologicaltoolkitforMi- crosoftexcel[m].berkeley,california:berkeleygeochronolo- [10]SchmidtM W.Amphibolecompositionintonaliteasafunction ofpressure,anexperimentalcalibrationofthealinhornblende barometer[j].contributionto MineralogyPetrology,1992,110 [11]BlundyJD,HolandTJB.Calcicamphiboleequilibriaanda newamphibole-plagioclasegeothermometer[j].contribution to MineralogyandPetrology,1990,104(2):208-224. [12]LeakeB E.Nomenclatureofamphiboles[J].TheCanadian. U-Pb,2004,49(16):1589-1604.,. : SHRIMP [J]., 2004,25(4):423-427. [15],,,. SHRIMP U-Pb [J]., 2004,23(4):298-304.
40 2017 [16]. [D]. [23],,,. :,2010. [17],,,. 3139-3169. [J]. [24]. - -,2011,85(5):757-777. [D]. :,2011. 2007,21(1):71-77. Cu-Fe [J].,2001,11(2):86-91. [20],,,. 1031-1039. : - [27],,,. [J].,2007,23(6):1294-1302. [21],,.,2004,50(5):538-542. [J].,1995,16(2):101-107. [J].,2012,28(10): 192. Os [J].,2015,31(4): Rb-Sr : [J]. [28]. - [22],,,. [J].,2003,25(3):173-178. [J].,2012,86(3):423-459. PetrographyandU-PbZirconGeochronologyofthe JitouPlutonintheXinqiaoCu-S-FeDeposit,TonglingArea, AnhuiProvince,andItsGeologicalSignificance SongYang 1,DuYangsong 1,ZhangZhiyu 2,MaHong 1,ZhuXiaoqiang 1 (1.SchooloftheEarthSciencesandResources,ChinaUniversityof Geosciences(Beijing),Beijing100083,China; 2.InstituteofGeology,ChineseAcademyofGeologicalSciences,Beijing100037,China) [18],,. [25],,,. Cu-Au-Fe-S : [J]., Re-Os [J].,2009,44(1):183- [19],. [26],,. Re- Abstract:TonglingoredistrictiscloselyrelatedtotheMesozoicintrusiveigneousrockswhichisequivalent tosomedepositsintheyangtzerivermetalogenicbelt.thepaper,takingthejitouplutonasthestudy object,studiesla-icp-mszirconu-pbdatingtosupplementxinqiaopluton'sgeologyandmineralogycon- tent.thehighth/uratiosandtypicalmagmaticoscilatoryzoningofzirconsindicatetheirmagmaticori- gin.theweightedaverageageofthequartzdioritefrom16testingspotsinthemajorpartofxinqiaoplu- tonis(141.6±1.1)ma,whiletheweightedaverageageofthelateintrusivedioritedikesfrom20spotsis (129.95±0.6)Ma,bothofwhichwereformedintheEarlyCretaceous.Thereareatleasttwotimesof magmaticactivity,withthemainmagmatismtimeat141ma.themagmaisderivedfromthedeepmantle emplacingalongthetectoniccracktothe middlecrust (about13-15km)andformedthedeep magma chamberaccompaniedbyfractionationcrystalizationandassimilation.then,undertheinfluenceofgeo- logicalstructure,themagmainthedeep magmachamberemplacedagainalongtheweaktectoniccrackto theuppercrust(7kmto8km)andeventualyformedthejitoupluton,withthecrystalizationtempera- tureabout800.xinqiaodepositwasformedthroughthehigh-temperaturehydrothermalmetasomatic, andsuperimposedhydrothermalprocessmanytimeslater. Keywords:Jitoupluton;mineralogy;zircondating;XinqiaoCu-S-Fedeposit;TonglingofAnhuiProvince