江西吉泰盆地碱性玄武岩的地球化学特征及其构造意义
摘要
吉泰盆地位于赣中地区, 目前尚无在该盆地中发现玄武岩的报道。新发现的玄武岩产于吉泰盆地南部泰和附近的南溪镇。玄武岩露头新鲜, 蚀变微弱, 属碱性玄武岩, 形成于板内快速拉张环境; 锆石U Pb年龄为 ( 139±0 7 ) ~(143±1 1)Ma, 表明岩石形成于早白垩世早期。玄武岩无明显的Nb、Ta负异常, Rb Sr、Sm Nd同位素组成分析结果显示[N(87Sr) /N(86Sr) ]i=0 704 1~0 704 8, εNd(t) = +3 78~+4 38, 反映玄武岩浆起源于亏损地幔, 未经地壳物质混染。结合吉泰盆地边部存在中侏罗世 (168Ma) 玄武岩的事实, 表明赣中地区在早白垩世已经处于拉张背景, 吉泰盆地的碱性玄武岩可能是在板内岩石圈伸展减薄作用下, 由北东向的赣江断裂带拉张形成的。
New found basalt crop is located near the Nanxi Town, Taihe County, south of Ji'an-Taihe Basin, middle Jiangxi Province. With brown-grey and dark green color, the fresh basalt has compacted texture and some blisters and amygdules. Microscope observation reveals that the rocks have intergranular textures,more than 60% basic plagioclases, filling with olivines and augites, less than 5% almond-shaped calcites, and weak corrosion. According to its geochemical features, the basalt belongs to alkali-basalt, produced by quick regional extension within a plate. Rb-Sr and Sm-Nd isotopic composition of the basalt are as follow:(~(87)Sr/~(86)Sr)_i =(0.704 1-0.704 8) and ε_(Nd)(t)=+3.78-+4.38, indicating that the magma came from the deficit mantle and had not mixed with crust material. The zircon solution U-Pb geochronological data of(139±0.7)to(143±1.1)Ma for the alkali-basalt indicates that mantle-reached strike-slip faulting along northeast-striking Ganjiang Fault and Wuchuan-Sihui Fault was active from early period of Early Cretaceous under the extensional background of the area.
New found basalt crop is located near the Nanxi Town, Taihe County, south of Ji'an-Taihe Basin, middle Jiangxi Province. With brown-grey and dark green color, the fresh basalt has compacted texture and some blisters and amygdules. Microscope observation reveals that the rocks have intergranular textures,more than 60% basic plagioclases, filling with olivines and augites, less than 5% almond-shaped calcites, and weak corrosion. According to its geochemical features, the basalt belongs to alkali-basalt, produced by quick regional extension within a plate. Rb-Sr and Sm-Nd isotopic composition of the basalt are as follow:(~(87)Sr/~(86)Sr)_i =(0.704 1-0.704 8) and ε_(Nd)(t)=+3.78-+4.38, indicating that the magma came from the deficit mantle and had not mixed with crust material. The zircon solution U-Pb geochronological data of(139±0.7)to(143±1.1)Ma for the alkali-basalt indicates that mantle-reached strike-slip faulting along northeast-striking Ganjiang Fault and Wuchuan-Sihui Fault was active from early period of Early Cretaceous under the extensional background of the area.
引文
郑文,张芳荣吉—泰盆地碱性系列基性侵入岩特征及其构造意义江西地质科技,1996,23(增刊):57-61.
郭英杰,黄金喜,杨淼生.江西省赣江构造带基本特征的初步研究.江西地质矿产局研究报告.1982.1-41.
[1] 王岳军,廖超林,范蔚茗,等.赣中地区早中生代OIB碱性玄武岩的厘定及构造意义[J].地球化学,2004,33(2):109-117
[2] 余心起,舒良树,邓平,等.中国东南部侏罗纪—第三纪陆相地层沉积特征[J].地层学杂志,2003,27(3):254-263
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[4] WinchersterJA,FloydPA Geochemicaldiscriminationofdif ferentmagmaseriesandtheirdifferentiationproductsusingim mobileelements[J].ChemicalGeology,1977,20(4):325-343
[5] BoyntonWV Geochemistryoftherareearthelements: meteor itestudies[A].HendenersonP RareEarthElementGeo chemistry[C].Amsterdam:Elsevier,1984.63-114
[6] SunSS,McDonoughWF Chemicalandisotopicsystematicsofoceanicbasalt:Implicationsformantlecompositionsandproces ses[J].GeologicalSociety(London)SpecialPublication,1989,42:313-345
[7] 贾大成,胡瑞忠,卢焱湘东南汝城盆地火山岩的元素地球化学及源区性质讨论[J].现代地质,2003,17(2):131-136
[8] 汪云亮,张成江,修淑芝玄武岩类形成的大地构造环境的Th/Hf—Ta/Hf图解判别[J].岩石学报,2001,17(3):413-421
[9] 朱勤文,王方正,路凤香,等.湘南中新生代玄武岩岩石学特征[J].现代地质,1996,10(4):461-469
[10]GradsteinFM,OggJG,SmithAG, etalAnewgeologicaltimescalewithspecialreferencetoPrecambrianandNeogene[J].Episodes,2004,27(2):83-100
[11]黄萱,吴利仁陕西地区岩浆岩Nd,Sr同位素特征及其与大地构造发展的联系[J].岩石学报,1990,6(2):1-11
[12]邱家骧,陶奎元,赵俊磊,等.火山岩[M].北京:地质出版社,1996.1-143
[13]徐义刚拉张环境中的大陆玄武岩浆作用:性质及动力学过程[A].郑永飞.化学地球动力学[C].北京:科学出版社,1999.119-167
[14]牛漫兰,朱光,宋传中,等.郯庐断裂带中南段新生代玄武岩源区特征及其演化[J].现代地质,2001,15(4):383-390
[15]PearceJA,CannJR Tectonicsettingofbasicvolcanicrocksdeterminedusingtraceelementanalysis[J].EarthandPlanetaryScienceLetters,1973,19:290-300
[16]PearceJA,NorryMJ PetrogeneticimplicationsofTi,Zr,YandNbvariationsinvolcanicrocks[J].ContributiontoMineralPetrology,1979,69:33-47
[17]EngebretsonDC,CoxA,GordenRG Relativemotionsbe tweenoceanicandcontinentalplatesinPacificbasin[J].Ge ologySocietyofAmericaSpecialPaper,1985,206:1-59
[18]MaruyamaS,SenoT Orogenyandrelativeplatemotions: ex ampleoftheJapaneseislands[J].Tectonophysics,1986,127:305-329
[19]GilderSA,KellerGR,LuoM, etalEasternAsiaandthewesternPacifictimingandspatialdistributionofriftinginChina[J].Tectonophysics,1991,197:225-243
[20]FaureM,Natal inB ThegeodynamicevolutionoftheeasternEurasianmargininMesozoictimes[J].Tectonophysics,1992,208(4):397-411
[21]PersonM,GarvenG Asensitivitystudyofthedrivingforcesonfluidflowduringcontinental-riftbasinevolution[J].GeologicalSocietyofAmericaBulletin,1994,106(4):46l-475
[22]LiXH CretaceousmagmatismandlithosphericextensioninSoutheastChina[J].JournalofAsianEarthSciences,2000,18:293-305
[23]ZhouXM,LiWX OriginoflateMesozoicigneousrocksinSoutheastrnChina: implicationsforlithospheresubductionandunderplatingofmaficmagmas[J].Tectonophysics,2000,326:269-287
[24]赵越,杨振宇,马醒华东亚大地构造发展的重要转折[J].地质科学,1994,29(2):105-119
[25]谢昕,徐夕生,邹海波,等.中国东南沿海中—新生代玄武岩微量元素和NdSrPb同位素研究[J].岩石学报,2001,17(4):617-628
[26]万天丰,朱鸿中国大陆及邻区中生代—新生代大地构造与环境变迁[J].现代地质,2002,16(2):107-120
[27]舒良树,邓平,王彬,等.南雄—诸广地区晚中生代盆山演化的岩石化学、运动学与年代学制约[J].中国科学D辑,2004,34(1):1-13
[28]余心起,舒良树,颜铁增,等.江山—广丰地区早白垩世晚期玄武岩的岩石地球化学及其构造意义[J].地球化学,2004,33(5):465-476
[29]ShuLS,DengP,WangB, etalLithology, kinematicsandgeochronologyrelatedtoLateMesozoicbasin-mountainevolu tionintheNanxiongZhuguangarea,SouthChina[J].ScienceinChina(SerD),2004,47(8):673-688
[30]滕吉文,闫雅芬中国东南大陆和陆缘地带板内构造界带的地磁异常场响应[J].大地构造与成矿学,2004,28(2):105-117
[31]崔学军,陈祥云,楼法生,等.赣江断裂带的特征及其与郯庐断裂带的关系[J].地学前缘,2002,9(4):339-340
[32]郑家仪吴川—四会断裂北段特征及其与金属成矿的关系[J].铀矿地质,1996,12(5):265-275
[33]邓平,舒良树,郭英杰,等.赣江断裂带地质特征及其动力学演化[J].地质论评,2003,49(2):113-122
[34]水汀,施华生,潘明宝吴川—四会断裂带构造岩变形环境分析[J].火山地质与矿产,1997,18(3):191-202
[35]汪洋,邓晋福广东吴川—四会断裂带燕山期强过铝质花岗岩岩石化学特征的地球动力学意义[J].大地构造与成矿学,2003,27(1):56-63
[36]卢秋芽江西吉泰盆地泰和坳陷白垩纪沉积特征[J].物探与化探,1991,15(5):395-398
[37]徐鸣洁,舒良树中国东南部晚中生代岩浆作用的深部条件制约[J].高校地质学报,2001,7(1):21-33
[38]舒良树,周新民中国东南部晚中生代构造格架[J].地质论评,2002,48(3):249-260
[39]杨日红,董建乐,李才,等.藏北新生代火山岩主要造岩矿物特征及温压条件[J].现代地质,2002,16(2):153-158
[40]徐夕生,蔡元峰,周新民中国东南部新生代岩石圈地幔研究[J].南京大学学报:自然科学版,2000,36(6):773-779
[41]邓平,舒良树,余心起,等.闽西—赣南早—中侏罗世盆地及其火山岩特征[J].岩石学报,2004,20(3):521-532
[42]舒良树,周新民,邓平,等.中国东南部中、新生代盆地特征与构造演化[J].地质通报,2004,23(9-10):876-884
郭英杰,黄金喜,杨淼生.江西省赣江构造带基本特征的初步研究.江西地质矿产局研究报告.1982.1-41.
[1] 王岳军,廖超林,范蔚茗,等.赣中地区早中生代OIB碱性玄武岩的厘定及构造意义[J].地球化学,2004,33(2):109-117
[2] 余心起,舒良树,邓平,等.中国东南部侏罗纪—第三纪陆相地层沉积特征[J].地层学杂志,2003,27(3):254-263
[3] 江西省地质矿产局江西省区域地质志[M].北京:地质出版社,1984.260-330,796-798
[4] WinchersterJA,FloydPA Geochemicaldiscriminationofdif ferentmagmaseriesandtheirdifferentiationproductsusingim mobileelements[J].ChemicalGeology,1977,20(4):325-343
[5] BoyntonWV Geochemistryoftherareearthelements: meteor itestudies[A].HendenersonP RareEarthElementGeo chemistry[C].Amsterdam:Elsevier,1984.63-114
[6] SunSS,McDonoughWF Chemicalandisotopicsystematicsofoceanicbasalt:Implicationsformantlecompositionsandproces ses[J].GeologicalSociety(London)SpecialPublication,1989,42:313-345
[7] 贾大成,胡瑞忠,卢焱湘东南汝城盆地火山岩的元素地球化学及源区性质讨论[J].现代地质,2003,17(2):131-136
[8] 汪云亮,张成江,修淑芝玄武岩类形成的大地构造环境的Th/Hf—Ta/Hf图解判别[J].岩石学报,2001,17(3):413-421
[9] 朱勤文,王方正,路凤香,等.湘南中新生代玄武岩岩石学特征[J].现代地质,1996,10(4):461-469
[10]GradsteinFM,OggJG,SmithAG, etalAnewgeologicaltimescalewithspecialreferencetoPrecambrianandNeogene[J].Episodes,2004,27(2):83-100
[11]黄萱,吴利仁陕西地区岩浆岩Nd,Sr同位素特征及其与大地构造发展的联系[J].岩石学报,1990,6(2):1-11
[12]邱家骧,陶奎元,赵俊磊,等.火山岩[M].北京:地质出版社,1996.1-143
[13]徐义刚拉张环境中的大陆玄武岩浆作用:性质及动力学过程[A].郑永飞.化学地球动力学[C].北京:科学出版社,1999.119-167
[14]牛漫兰,朱光,宋传中,等.郯庐断裂带中南段新生代玄武岩源区特征及其演化[J].现代地质,2001,15(4):383-390
[15]PearceJA,CannJR Tectonicsettingofbasicvolcanicrocksdeterminedusingtraceelementanalysis[J].EarthandPlanetaryScienceLetters,1973,19:290-300
[16]PearceJA,NorryMJ PetrogeneticimplicationsofTi,Zr,YandNbvariationsinvolcanicrocks[J].ContributiontoMineralPetrology,1979,69:33-47
[17]EngebretsonDC,CoxA,GordenRG Relativemotionsbe tweenoceanicandcontinentalplatesinPacificbasin[J].Ge ologySocietyofAmericaSpecialPaper,1985,206:1-59
[18]MaruyamaS,SenoT Orogenyandrelativeplatemotions: ex ampleoftheJapaneseislands[J].Tectonophysics,1986,127:305-329
[19]GilderSA,KellerGR,LuoM, etalEasternAsiaandthewesternPacifictimingandspatialdistributionofriftinginChina[J].Tectonophysics,1991,197:225-243
[20]FaureM,Natal inB ThegeodynamicevolutionoftheeasternEurasianmargininMesozoictimes[J].Tectonophysics,1992,208(4):397-411
[21]PersonM,GarvenG Asensitivitystudyofthedrivingforcesonfluidflowduringcontinental-riftbasinevolution[J].GeologicalSocietyofAmericaBulletin,1994,106(4):46l-475
[22]LiXH CretaceousmagmatismandlithosphericextensioninSoutheastChina[J].JournalofAsianEarthSciences,2000,18:293-305
[23]ZhouXM,LiWX OriginoflateMesozoicigneousrocksinSoutheastrnChina: implicationsforlithospheresubductionandunderplatingofmaficmagmas[J].Tectonophysics,2000,326:269-287
[24]赵越,杨振宇,马醒华东亚大地构造发展的重要转折[J].地质科学,1994,29(2):105-119
[25]谢昕,徐夕生,邹海波,等.中国东南沿海中—新生代玄武岩微量元素和NdSrPb同位素研究[J].岩石学报,2001,17(4):617-628
[26]万天丰,朱鸿中国大陆及邻区中生代—新生代大地构造与环境变迁[J].现代地质,2002,16(2):107-120
[27]舒良树,邓平,王彬,等.南雄—诸广地区晚中生代盆山演化的岩石化学、运动学与年代学制约[J].中国科学D辑,2004,34(1):1-13
[28]余心起,舒良树,颜铁增,等.江山—广丰地区早白垩世晚期玄武岩的岩石地球化学及其构造意义[J].地球化学,2004,33(5):465-476
[29]ShuLS,DengP,WangB, etalLithology, kinematicsandgeochronologyrelatedtoLateMesozoicbasin-mountainevolu tionintheNanxiongZhuguangarea,SouthChina[J].ScienceinChina(SerD),2004,47(8):673-688
[30]滕吉文,闫雅芬中国东南大陆和陆缘地带板内构造界带的地磁异常场响应[J].大地构造与成矿学,2004,28(2):105-117
[31]崔学军,陈祥云,楼法生,等.赣江断裂带的特征及其与郯庐断裂带的关系[J].地学前缘,2002,9(4):339-340
[32]郑家仪吴川—四会断裂北段特征及其与金属成矿的关系[J].铀矿地质,1996,12(5):265-275
[33]邓平,舒良树,郭英杰,等.赣江断裂带地质特征及其动力学演化[J].地质论评,2003,49(2):113-122
[34]水汀,施华生,潘明宝吴川—四会断裂带构造岩变形环境分析[J].火山地质与矿产,1997,18(3):191-202
[35]汪洋,邓晋福广东吴川—四会断裂带燕山期强过铝质花岗岩岩石化学特征的地球动力学意义[J].大地构造与成矿学,2003,27(1):56-63
[36]卢秋芽江西吉泰盆地泰和坳陷白垩纪沉积特征[J].物探与化探,1991,15(5):395-398
[37]徐鸣洁,舒良树中国东南部晚中生代岩浆作用的深部条件制约[J].高校地质学报,2001,7(1):21-33
[38]舒良树,周新民中国东南部晚中生代构造格架[J].地质论评,2002,48(3):249-260
[39]杨日红,董建乐,李才,等.藏北新生代火山岩主要造岩矿物特征及温压条件[J].现代地质,2002,16(2):153-158
[40]徐夕生,蔡元峰,周新民中国东南部新生代岩石圈地幔研究[J].南京大学学报:自然科学版,2000,36(6):773-779
[41]邓平,舒良树,余心起,等.闽西—赣南早—中侏罗世盆地及其火山岩特征[J].岩石学报,2004,20(3):521-532
[42]舒良树,周新民,邓平,等.中国东南部中、新生代盆地特征与构造演化[J].地质通报,2004,23(9-10):876-884
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