Zircon LA-ICP-MS U-Pb Dating of the Porphyritic Monzonitic Granite from Southwest Hongyanjing in Beishan Area, Gansu Province and Its Significance
-
摘要: 在1∶5万红泉等5幅区域地质调查中，对红岩井西南似斑状二长花岗岩体进行了岩石地球化学和锆石U-Pb测年研究，并在该岩体中获得了LA-ICP-MS锆石U-Pb年龄为（402.2±4.4）Ma，属早泥盆世。岩石化学和地球化学特征表明似斑状二长花岗岩体富Si（SiO2为68.12%~75.76%）、富碱（ALK=7.69%~9.91%），铝饱和指数A/CNK＝1.02~1.05，里特曼指数σ＝1.8~3.8，平均为2.38；属钙碱性准铝质S型花岗岩系列；ΣREE＝175.4~296.76，球粒陨石标准化分布模式图上显示具海鸥型特征，富集HFSE、Y，强烈亏损Ba、Sr、Eu、P、Ti。构造图解反映出该花岗岩体形成于同碰撞-碰撞后，结合测区的地质特征及同位素年代特征，说明北山主造山期应为加里东末期。
-
关键词:
- 甘肃北山 /
- 似斑状二长花岗岩 /
- LA-ICP-MS锆石U-Pb年龄 /
- 早泥盆世
Abstract: In this paper, the chronologic and geochemical researches were carried out on the porphyritic monzonitic granite in Southwest Hongyanjing.The zircon LA-ICP-MS U-Pb dating results show that the zircon U-Pb age of the intrusions is (402.2±4.4)Ma, which indicates that this intrusion was formed in the Early Devonian.Petrochemical and Geochemical data indicate that the porphyritic monzonitic granite are characterized by high Si (68.12%~75.76%)and high alkali (7.69%~9.91%), with A/CNK value of 1.4~1.5.Such geochemical characteristics, such as the rittmann index in sigma(σ)=1.8~3.8 (average 2.38), indicate that this intrusions belongs to the calc-alkaline strong peraluminous series.It displays higher total REE content(ΣREE=175.4~296.76).Trace elements HFSE and Y are well concentrated, but Ba, Sr, Eu, P, and Ti are poorly concentrated.The comprehensive analysis also suggests that the granite is strongly peraluminous S-type granite of the calc-alkaline suite,which was formed in the post-orogenic tectonic environment. -
-
代文军,龚全胜.甘肃北山"勒巴泉群"的解体及地质意义[J].甘肃地质学报,2000,9(1):23-29. DAI Wenjun, GONG Quansheng。Redividing of "Lebaquan Group"in Beishan Area of Gansu Province and Its Geological Implication[J].Acta Geologica Gansu,2000,9(1):23-29.
龚全胜,刘明强,李海林,等.甘肃北山造山带类型及基本特征[J].西北地质,2002.35(3):28-34. GONG Quansheng,LIU Mingqiang,LI Hailing,et al.The type and basic characteristics of Beishan orogenic belt,Gansu[J].Northwest Geology.2002.35(3):28-34.
龚全胜,刘明强,梁明宏,等.北山造山带大地构造相及构造演化[J].西北地质,2003.36(1):11-17. GONG Quansheng,LIU Mingqiang,LIANG Minghong,et al.The Tectonic Facies and Tectonic Evolution of Beishan Orogenic Belt, Gansu[J].Northwest Geology.2003,36(1):11-17.
何世平,任秉琛,姚文光,等.甘肃内蒙古北山地区构造单元划分[J].西北地质,2002,35(4):30-40. HE Shiping,REN Bingchen,YAO Wenguang,et al.The division of tectonic units of Beishan area, Gansu-Inner Mongolia[J].Northwest Geology,2002,35(4):31-40.
何世平,周会武,任秉琛,等.甘肃内蒙古北山地区古生代地壳演化[J].西北地质,2005,38(3):6-15. HE Shiping, ZHOU Huiwu, REN Bingchen, et al.Crustal evolution of Palaeozoic in Beishan area, Gansu and Inner Mongolia, China[J].Northwest Geology,2005,38(3):6-15.
江思宏,聂凤军,陈文,等.北山明水地区花岗岩时代的确定及其地质意义[J].岩石矿物学杂志,2003.22(2):107-111. JIANG Sihong,NIE Fengjun,CHEN Wen,et al.The determination of the emplacement age of granite in Mingshui,Beishan area, and its implication[J].Acta Petrologica et mineralogica。2003.22(2):107-111.
李昌年.火成岩微量元素岩石学[M].武汉:中国地质大学出版社,1992. LI Changnian.Igneous Trace Elements Petrology[M].Wuhan:China University of Geosciences Press.1992.
李锦轶,王克卓,李亚萍等.2006.天山山脉地貌特征、地壳组成与地质演化[J].地质通报,25(8):895-909. LI J Y, WANG K Z, Li Y P, et al.Geomorphological Features, Crustal Composition and Geological Evlution of the Tianshan Mountains[J].Geological Bulletin of China, 2006,25(8):895-909.
李锦轶,张进,杨天南,等.北亚造山区南部及其毗邻地区地壳构造分区与构造演化[J].吉林大学学报(地球科学版),2009,39(4):584-605. LI Jinyi,ZHANG Jin,YANG Tiannan,et al.Crustal Tectonic Division and Evolution of the Southern Part of the North Asian Orogenic Region and Its Adjacent Areas[J].Journal of Jilin University(Earth Science Edition),2009,39(4):584-605.
刘明强,龚全胜.甘肃北山勒巴泉变质核杂岩[J].西北地质, 2003,36(2):30-34. LIU Mingqiang, GONG Quansheng.On Metamorphic Core Complex of Lebaquan in Beishan Area, Gansu[J].Northwest Geology.2003,36(2):30-34.
刘雪亚,王荃.中国西部北山造山带的大地构造及其演化[J].地学研究,1995,28:37-48. LIU Xueya,WANG Quan.Tectonics of Orogenic Belts in Beishan Mts.,Western China and Their Evolution[J].Dixue Yanjiu,1995,(28):37-48.
武鹏,王国强,李向民,等.甘肃北山地区牛圈子蛇绿岩的形成时代及地质意义[J].地质通报,2012,31(12):2032-2037. WU Peng,WANG Guoqiang,LI Xiangmin,et al.The Age of Niujuanzi Ophiolite in Beishan Area of Gansu Province and Its Geological Significance[J].Geological Bulletin of China,2012,31(12):2032-2037.
吴元保,郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报,2004,49(16):1589-1604. WU Yuanbao,ZHENG Yongfei.Study on the Genetic Mineralogy of Zircon and its Constraint on the Explanation on Zircon U-Pb Age[J].Chinese Science Bulletin,2004,49(16):1589-1604.
杨合群,李英,李文明,等.北山花岗岩S型/I型空间变化规律及含矿性[J].地球学报,2009,30(5):627-633. YANG Hequn,LI Ying,LI Wenming,et al.Spatial Variation Regularity and Ore Potential of S-type and I-type Granites in the Beishan Mountain[J].Acta Geoscientica Sinica,2009,30(5):627-633.
袁洪林,吴福元,高山,等.东北地区新生代侵入体的锆石激光探针U-Pb年龄测定与稀土元素成分分析[J].科学通报,2003,48(14):1511-1520. YUA HL,WU FY,GAO S,et al..LA-ICP-MS Zircon U-Pb Dating and REE Analysi s of the Cenozoic Intrusion in Northeast China[J].Chinese Science Bulletin.2003,48(14):1511-1520.
张旗,王焰,李承东,等.花岗岩按照压力的分类[J].地质通报,2006,25(11):1274-1278. ZHANG Qi,WANG Yan,LI Chengdong,et al.A Granite Classification Based on Pressures[J].Geological Bulletin of China, 2006,25(11):1274-1278.
张旗,王焰,李承东,等.花岗岩的Sr-Yb分类及其地质意义[J].岩石学报,2006,22(9):2249-2269. ZHANG Qi,WANG Yan,LI ChengDong,et al.Granite Classification on the Basis of Sr and Yb Contents and Its Implications[J].Acta Petrologica Sinica,2006,22(9):2249-2269.
张旗,王元龙,金惟俊,等.造山前、造山和造山后花岗岩的识别[J].地质通报,2008,27(1):1-18. ZHANG Qi,WANG Yuanlong,JIN Weijun,et al.Criteria for the Recognition of Pre-, Syn-and Post-Orogenic Granitic Rocks[J].Geological Bulletin of China, 2008,27(1):1-18.
左国朝,刘义科,刘春燕.甘新蒙北山地区构造格局及演化[J].甘肃地质学报,2003,12(1):1-15. ZUO Guochao.LIU Yike,LIU Chunyan.Framework and Evolution of the Tectonic Structure in Beishan Area Across Gasu Province,Xinjiang Autonomous Region and Inner Mongolia Autonomous Region[J].Acta Geologica Gansu,2003,12(1):1-15.
左国朝, 何国琦.北山板块构造及成矿规律[M].北京:北京大学出版社,1990. ZUO Guochao,HE Guoqi.Plate Tectonics Metallogenic Regularities in Beishan Region[M].Beijing:Beijing University Publishing House,1990.
ANAERSEN T.Correction of common lead in U-Pb analyses that do not report 204Pb[J].Chemical geology,2002,192:59-79(in English).
BALLARD J R,PALIN J M,WILLIAMS I S,et al.Two ages of porphyry intusion resolved for the super-giant Chuquicamata copper deposit of northern Chile by ELA-ICP-MS and SHRIMP[J].Geology,2001,29:383-386.
HOM I,RUDMICK R L,MCDONOUGH W F.Precise elemental and isotope ratio determination by simultaneous soluton nebulization and laser ablation-ICP-MS:Application to U-Pb geochronology[J].Chemical Geology,2000,167:405-425.
KOSLER J,Fonneland H,Sylvester P,et al.U-Pb dating of detrital zircons for sediment provenance studies-a conparison of laser ablation iCPMS and SIMS techniques[J].Chemical Geology,2002,182:605-618.
LUDWIG K R.Isoplot-A plotting and regression program for radio-genic-isotope data[J].US Geological Survey Open-File Report,1991,39:91-445.
计量
- 文章访问数: 2481
- HTML全文浏览量: 1
- PDF下载量: 2419
下载:
