准噶尔盆地南缘下侏罗统三工河组地球化学、沉积环境及源区特征分析.pdf

新疆地质XINJIANGGEOLOGY2024年3月Mar.2024第42卷 第1期Vol.42 No.1?新疆?地区?45E001012等?1?5?区域地质?查（DD20190065）?日期?2023-08-07?日期?2023-11-21?（1999-），?人，?大学?读?，?从事地球?学方面的研究?E-mail:?华（1965-），?，?，研究?，从事地质学?学与研究?作?E-mail:?地?地球化学?及源区特征分?1，?1，?2，?1，?2，?1（1.?安?地?院，陕西 西安 710054；2.中国地质调查局西安地质调查中心，陕西 西安 710119）?尔?地?是?要的?勘?地区，也是研究?地?性、?的?要区域。?统?由上部主体?-?、?质?、?质?和?部?、含?、?成，?上部?品?行?学、?学和地球?学研究?：?品?学?数（CIA）为77.57，?物源区?中等?作?物质?和?选?，?明?物?，成?成?低?Cu/Zn、V/Cr、V/(V?Ni)、Ni/Co及U/Th?为?的?-?Sr/Cu、Al2O3/MgO?的?征?Li，Sr，Sr/Ba，Th/U?综合?学?征?为，?上部主体为?，?部为?。?品中含流?，La/Th-?f、La/Sc-Co/Th和Ni-TiO2?源?主要来自?上地?质?出?和Th/Co、Th/Cr?源?有?中-基性?。?品与?成?、Th-Co-Zr/10、La-Th-Sc、Th-Sc-Zr/10?物源区?为大?。?尔?地?地球?学?尔?地?统?为八?和?，?。八?为?主要?源?位之?1-3?，?有?成?件?4,5?，?的?勘?。?广泛?尔?地大部?区域。?人研究?果?明，?区域?征?定?4-13?。?人?和?中?的研究主要?着?征?6-8?、?体?和?件?9-13?，?为区域内?体?件自?期?到?期?14-15?，?期发?有?、?刷?体?合等?体?合?10?。?研究为?续?向?研究?。?期?有?明?地质?5?，?区?是?勘?的?，?区域?关的研究?。?期研究大?传统的研究方法，新?方法?开?，?是?的元?地球?学?，?和?源区?征研究?，从?源勘?。本文?人研究基础上，?外?面、?学、元?地球?学方法，?尔?地?及物源?征?行?，为?地?性、?和?尔?地与?之?的?合关系研究?据，?勘?开发有?定?。1 地?景研究区位?尔?地?，?部（?1-a），?，?尔地?和?木?之?的?合?上?16-21?，行政区域?新疆维吾尔自治区?。?尔?地?6期?20?，形成?尔?地?的?局。?研究区?部，?NW向?向?的?，向?，?中发?期的NW向和NE向2?，由?面PM6?（?1-b），?位?第6-32?，总?330.4 m，?面?性?征?2。2?学?主要?-?（?3-a），?部有部?为?（?3-b），?性为中?、?质?、?质?及?含?、?。?主要为?理，?交?理、?编?1000-8845(2024)01-033-08?P534.52?P59?A新疆地质2024年?理、?理等（?3-g-i）。?源?主要由?、?和?元?成，?常?，?、?为主，?选?，中?为主，?为0.05?0.5 mm?元?单?为主，?含有?、?质?元?为主，?含?元?流?、?、?、?等，?、?及?。?物主要由?质?基及?质、?质、?质?物?成，?支?，?质?基?质?为?生?大?质?，?，?质主要为方?。?中?含有?-?（?3-c-f）。3?结?3.1?物地球?学?征可?物源及?。?、地形、?和成?作?，物源区?性质和?也会?。?，?学成?可?源?征，?源区?、大地?和?等。本文选?新疆?地区PM6?面?品6件，?大学成矿作?及?学?行?地球?学?和?矿物类?定。3.2主?含?（?1），?、?、?、?含?，?、?含?，?、?、?含?与?美?（?4-a）?22?。?XRD?主要矿物?成为?、?、?、?、?、?，?矿物为主，?低。3.3?中Sc，Cs，?f等元?，?Cr，Co，Ni，Rb，Sr，Th等元?（?2，?4-b）。REE总?为49.50?10-6?188.34?10-6，?136.23?10-6，总体低?美?22?，LREE 总?为 38.37?10-6?164.79?10-6，?116.75?10-6，?REE总?为11.14?10-6?23.54?10-6，?19.48?10-6，LREE/?REE 为3.44?7.09，?5.78，?征?LaN/YbN为 2.52?8.10，?5.75，?明?明?1?地?a?地质?b?Fig.1 Structural unit di?ision diagram of the?unggar Basin(a)and measured geological map of the study area(b)1.?2.?3.?4.?5.?6.?7.?8.西?9.?10.八?11.?群?12.?群?13.?14.?合接?15.?合?16.向?17.?18.?19.?34第42卷 第1期?等：?尔?地?统?地球?学、?及源区?征?（?3）。?元?明?征（?4-c），?明?品?元?元?，?明?品?元?低，?低。4 讨论?品CIA?为73.93?83.64，?77.57（?2），?体上为中等?学?，?的?23?。?品Al2O3含?与?REE?的?关性（r?-0.681），?明?学?作?元?。?Al2O3含?与(La/Yb)N（r?-0.112），CIA?与(La/Yb)N（r?0.007）?关性，?明?作?元?作?产生?24?。?外 TiO2?与?REE有?定?关（r?0.581），?P2O5与?REE和(La/Yb)N?关性（r?0.209?r?-0.065），?明?选可能?成?部?元?的?，?元?有?。?中大?数?元?的?的?25?，?成?作?可能?元?，?来自大?数?元?的?和源区?征?会?成?所?26-29?。?定元?可作为物源区的合理?，成?作?物源?征?中的?可?计。4.1?合?外?征?为，?上部主体为?，?部为?。?部?、含?、?流流?和?的交汇部位，主要?到?流?作?，形成?规?的?地?，?随着?发?，?上?30?，?续?-?、?质?、?质?所?（?2）。元?地球?学?物中?定的?征，可?地?31?，能?系统的?时?、?、?成?的?征。?主要为?-?，?部?部?2?Fig.2 Actual measured profile bar chart of?urassic Sangonghe Formation1.?2.含?3.中?4.?5.?6.?质?7.?质?8.?9.?质?35新疆地质2024年?为?，?体上为?-?。?品?元?Cu/Zn?为0.29?0.78，?0.42?V/Cr?为 1.42?1.81，?1.67?V/(V?Ni)?为 0.68?0.84，?0.77?Ni/Co?为1.96?2.93，?2.55?U/Th?为0.35?0.40，?0.36。综上，研究区?总体形成?的?-?之?32-36?。?部?，上部主体?-?的?征。?品中Sr/Cu?为1.80?3.15，?2.33，?10?SiO2/Al2O3?为2.74?3.62，?3.12?Al2O3/MgO?为10.1?17.28，?12.1，?大。?上?和?学?征?研究区?主要?时期为?的?征?37-40?。?研究可作为地质?时期?的?要?。?品中Li含?为27.00?10-6?48.67?10-6，?37.67?10-6?Sr含?为79.29?10-6?122.55?10-6，?96.45?10-6?Sr/Ba?为0.15?0.23，?0.18?Th/U?为2.50?3.26，?2.81。?上元?及?时?41-45?。?中?世?作?，?张，?时期与?的?部八?和上部西?含?，?征。?含?，?尔?地内?最大，?时期?地?最大，?的?。?世?世时期，?印支?的?，?地内广泛发?-?流?46?，从八?末期?期，?由?为?。?，?地?大规?47?，随着?体?，?，?向?。?体来?期?46?，?体为?，?的?也印证?尔?地发?的?3?Fig.3 Field outcrops?microscopic photos and sedimentary structures of the Sangonghe Formationa?-?质?中?b?c?中?d?含?e?含?f?含?中?g?交?理?h?交?理?i?理?1?主?T a b l e 1Ma i ne l e me n t t e s t r e s u l t s o f mu d s t o n e s i nS a n g o n g h e F o r ma t i o n单位：%?号?X008?X009?X010?X011?X012?X013?SiO257.4257.5757.1954.8659.4763.3858.32TiO21.041.111.061.031.111.061.07Al2O318.9818.5919.1520.0517.7617.4918.67TFe2O38.849.087.589.798.545.978.3MnO0.070.080.060.050.060.060.06MgO1.771.841.621.161.381.471.54CaO0.360.470.480.460.470.480.45Na2O0.891.130.890.281.081.550.97K2O2.862.92.882.773.42.772.93P2O50.040.10.070.040.050.120.07LOI7.877.739.089.67.136.457.98TOTAL100.14100.60100.06100.09100.45100.8-CIA78.7276.7278.3083.6474.1073.9377.5736第42卷 第1期?等：?尔?地?统?地球?学、?及源区?征?。4.2?研究区?成?有流?、?、?、?等。流?和?源区物质可能为上地?的中?性?，与?的八?，?为?物源区。?外，?和?选?，?的?。?人?尔?地?、?邻地区?征和物源?的研究，?为?物源区也?来自?地区?48?。研究区八?品的?U-Pb年?主要?（280?370）Ma和（410?470）Ma之?，与?地区中?性伟?年?（280?480）Ma?合?49-51?。?人研究发?，?尔?地?世?地区?47?，?2?主?T a b l e 2T r a c e e l e me n t t e s t r e s u l t s a n dma i nt r a c e r a t i o o f mu d s t o n e s i nS a n g o n g h e F o r ma t i o n?号LiScVCrCoNiCuZnRbSrYZrNbCsBaHX00843.9017.13142.0178.5617.3745.7737.96101.0947.0984.1526.50183.3313.6112.00453.93HX00948.6719.62148.7583.6418.1942.0745.01104.8156.5298.9631.33202.5314.509.54450.35HX01041.7815.11145.4583.6915.3143.1047.3385.1076.8095.0430.52193.0514.1114.00558.92HX01136.1315.44145.0582.1013.7826.9044.1156.8241.1379.2914.45190.8413.1716.20338.48HX01227.0015.59136.1188.5712.3130.8035.31111.66103.7198.6832.83242.3514.6315.89549.38HX01328.5514.91126.9789.3220.0558.6638.94132.3163.01122.5541.75230.8614.197.02813.95?37.6716.30140.7284.3216.1741.2241.4498.6364.7196.4529.56207.1614.0312.44527.50?号?fThUCu/ZnV/CrV/(V?Ni)Ni/CoU/ThSr/CuSr/BaTh/UTh/CoTh/CrSiO2/Al2O3Al2O3/MgOHX0086.786.922.390.381.810.762.640.352.220.192.900.400.093.0310.72HX0097.426.972.340.431.780.782.310.342.200.222.980.380.083.1010.1HX0107.137.362.750.561.740.772.820.372.010.172.680.480.092.9911.82HX0116.884.831.830.781.770.841.950.381.800.232.640.350.062.7417.28HX0128.538.292.540.321.540.822.500.312.790.183.260.670.093.3512.87HX0138.337.533.010.291.420.682.930.403.150.152.500.380.083.6211.9?7.516.982.480.421.670.772.550.362.330.182.810.430.083.1212.12?：?元?单位为 10-6?4?主?a?b?c?Fig.4 Main element(a)?trace element North American shale standardi?ed spider web(b)?R?distributioncur?e(c)of the Sangonghe Formation mudstone（据?文?22）37新疆地质2024年?之上，?明?时期?，?地?物源可能性?。?合研究区?学?征、?和?年?学?征，?为?源区主要为中?，部?来源?。?品中?Eu 为 0.70?0.75，?0.71（?2），?明?常，Eu?常?常?中?性?成?和?质?质?中，?源区?上大?地?为主?52?。?品Th/Co?为0.35?0.67，?0.43，?0.03?1.07 之?Th/Cr?为 0.059?0.094，?0.083，?0.31，?大?0.005。?品的 Th/Co 和Th/Cr?物源?为大?上地?53-56?，?中有?定的中-基性源?，与?含有?的?征?。从?中可?出（?5-a），?品数据?入?与?质?从?中可?出（?5-b），?品?入上地?质物源区?Ni-TiO2?中明?有?质区域，?接?质区域（?5-c）?57?。?，?为研究区?源?上地?质?为主，可能含有?中-基性?，物源区主要为中?地区。4.3?中，?的?会?地质体的地球?学?征?，?研究?的地球?学?征能?源区的?58?。研究区?物与?物地球?学?征?明，?品中?REE，LREE/?REE，La/?5?Fig.5 Source rock type discrimination map and source area tectonic background discriminationmap of the Sangonghe FormationaLa/Sc-Co/Th?bLa/Th-Hf?cNi-TiO2?dTh-Co-Zr/10?eLa-Th-Sc?fTh-Sc-Zr/10?OIA?大?CIA?大?ACM?大?PM?大?3?T a b l e 3R E Et e s t r e s u l t s o f mu d s t o n e i nS a n g o n g h e F o r ma t i o n?号LaCeNdEuYbREELREE?REELREE/?REEEu?常Ce?常(La/Yb)NHX00823.5853.2625.831.262.81134.14115.7918.356.310.711.057.40HX00921.7649.6224.591.243.14128.21108.7319.485.580.750.932.52HX01032.4168.7734.391.682.87174.58152.9921.587.090.710.985.49HX0117.9816.349.140.532.2749.5038.3711.143.440.711.046.02HX01233.3275.9936.911.773.23188.34164.7923.547.000.701.044.97HX01325.6753.5726.811.413.35142.63119.8422.795.260.710.998.10?24.1252.9326.281.322.94136.23116.7519.485.780.711.005.75?：?元?含?单位为 10-638第42卷 第1期?等：?尔?地?统?地球?学、?及源区?征?Yb(9.35)，(La/Yb)N，?Eu，U，Zr，Cr，Ba/Sr(2.05?10-6)等?与大?Nb与?大?征?Y，Nd与?大?V，Th/U(2.79?10-6)与大?,?元?及?明?有?各类?（?2）?59?。部?元?中能?定?，可?区?。?Th-Co-Zr/10、La-Th-Sc、Th-Sc-Zr/10?上，?品数据?大部?入大?及?（?5）?60?，?元?源区?大?为主。综合?品?元?征及?为，?物源区?为大?。5 结论（1）?尔?地?主要由上部主体?-?中?、?质?、?质?及?部?、含?、?成，发?理。（2）?物源区?中等?作?，?作?定元?产生?。?的?为主，?有?，?，形成?。（3）?源?主要来自?上地?质?，含?中-基性源?。物源区?为大?，?物来源主要为中?。?1?,?晓?,?,等.?尔?地?源?及勘?选区J.新疆?地质,2007(3):272-274.2?,?,?,等.新疆?尔?地?八?征与?规?J.中国地质,2010,37(6):1672-1681.3?,?,?,等.?尔?地?系八?作?J.?学?,2004(3):449-454.4?国华,张?,?华,等.?尔?地?部?统?体系及?J.?地理学?,2023,25(3):628-647.5?华?,王?,向?,等.?尔?地?系?源?评价J.?地质,2013,27(5):1070-1080.6 王?,?源,?文,等.?尔?地?部?系?地?征J.?学?,2006(2):16-19+27.7?,?,冯?,等.?尔?地?系?统?地理?与?J.?勘?与开发,2022,49(1):68-80.8?刚,王?,?,等.?尔?地?中?统?源?评价及?征J.中国矿业大学学?,2013,42(4):595-605.9?,张?民,?,等.?尔?地?面?体?J.新疆?地质,2019,40(3):298-306.10 许?,?,王?等.?尔?地?部?统?及?体?规?J.?地理学?,2020,22(2):221-234.11 Li Z,Guo J,Zhang Z.Sandstone bodies distribution in sequencestratigraphic framework of jurassic sangonghe formation in Moxi-zhuang area,Junggar basinJ.Journal of Mines,Metals and Fuels,2019,67(4):221-226.12 陈?,?,?,等.?尔?地?和西?件与?体?规?定?J.中国地质,2012,39(5):1290-1298.13 Guo Qiaozhen,Tan Jinmiao,Li Daoqing,et al.Grain Size CurveCharacteristics of 2nd Member of Sangonghe Formation in Qian-shao Area and Its Indicative Significance of Hydrodynamic Envi-ronmentJ.Applied Sciences,2022,12(19):9852-9852.14?,王?,?,等.?尔?地?家?面?统?征J.?地质,2006(1):77-85.15?,?.?尔?地?地?与?征J.?源与产业,2011,13(1):114-119.16?,陈发?,?.?尔?地的类?和?J.地学?,2000,(4):431-440.17?登发,?明,?,等.?尔?地?的?与基本?征J.地质科学,2005(2):248-261+304.18 张?,?登发,?晓?,等.?尔?合?地的形成与?J.中国?勘?,2006(1):47-58+7.19?,查明,王?,等.?尔?地?与?学?J.地球学?,2005(3):217-222.20?登发,张?,?,等.?尔?地?及?征J.?与?地质,2018,39(5):845-861.21?.?尔?地?新?系?矿物?合与地球?学?征研究D.?大学,2018.22 Taylor S R and Mclennan S M.The continental crust:its composi-tion and evolutionJ.The Journal of Geology,1985,94(4):57-72.23 Yan D,Chen D,Wang Q,et al.Large-scale climatic fluctuations inthe latest Ordovician on the Yangtze block,south ChinaJ.Geology,2010,38(7):599-602.24?明?,?文?,?,等.?地?中?统?地球?学?征及?物源?J.地质学?,2016,90(12):3337-3351.25 KaiJun Zhang.Secular geochemical variations of the Lower Creta-ceous siliciclastic rocks from central Tibet(China)indicate a tec-tonic transition from continental collision 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University,Xi?an,Shaanxi,710054,China;2.Xi an Geological Survey Center,China Geological Survey,Xi?an,Shaanxi,710119,China）Abstract:The southern margin of the Junggar Basin is an important area for oil and gas exploration.It is also an impor-tant area for studying the tectonic attributes of the basin and the evolution of the sedimentary environment.The previousresearch on the sedimentary environment and the characteristics of the clastic source area of the Sangonghe Formation inthe southern margin is partially inadequate,which is not conducive to further exploration and development.The SangongheFormation of the Lower Jurassic in the southern margin is composed of the upper main body of light blue-grey to grayishgreen feldspathic lithic sandstone,silty mudstone,muddy siltstone,and lower soil yellow feldspathic lithic sandstone,pebbly coarse sandstone,and conglomerate.Petrological,petrographic,and geochemical studies on the upper samplesshow that the chemical alteration index(CIA)of the sample is 77.57,indicating that the source area has undergone mod-erate weathering;The poor grinding and sorting of detrital materials indicate that the sediment transport distance is shortand the compositional maturity is low;Cu/Zn,V/Cr,V/(V+Ni),Ni/Co,and U/Th values indicate that the paleosedimentaryenvironment is an oxygen rich oxidation environment to a oxygen poor transition environment;Sr/Cu and Al2O3/MgO valuesindicate warm and humid climate characteristics;Li,Sr,Sr/Ba,Th/U values indicate freshwater environment;Based on thecomprehensive petrographic characteristics,it is believed that the upper part is mainly composed of shallow lake subfaciessedimentation,while the lower part is composed of braided river delta plain subfacies sedimentation.The sample con-tains rhyolite debris,and the discrimination maps of La/Th-Hf,La/Sc Co/Th,and Ni TiO2indicate that the source rocksof the Sangonghe Formation mainly come from felsic volcanic rocks in the upper crust;The presence of a small amountof andesite debris and Th