吉林东部敦(化)—密(山)断裂带内碱性粗面岩同位素年代学、岩石化学及地质意义
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摘要
吉林敦化—密山断裂带北段琵河口—黄泥河镇之间新发现有多处的霓辉粗面岩,岩石以普遍富含碱性矿物霓辉石为特点,均呈整合接触覆盖于船底山期碱性玄武岩之上,具高位喷发、低位充填特点,全岩K--Ar年龄测定结果 (25. 64±0. 53 Ma、27. 36±0. 45 Ma、28. 45±0. 56 Ma、28. 55±0. 43Ma、28. 63±0. 45 Ma、28. 65±0. 61 Ma)属渐新世。地球化学数据显示,霓辉粗面岩SiO_2质量分数均值为59. 05%,富碱、高钾,亏损大离子亲石元素(Sr、Ba、V、Cr),富集高场强元素(Nb、Ta、Hf、Zr)和轻稀土元素(LREE),∑REE含量很高,具有右倾型稀土分配型式,显示明显Eu负异常。研究表明,霓辉粗面岩是由碱性玄武质岩浆经强烈分离结晶作用形成的,揭示该区渐新世处于一种强烈的拉张环境,幔源岩浆经历了由碱性玄武岩-碱性粗面岩的演化过程。
Aegirine trachytes were newly recognized in northern Dunhua--Mishan fault belt,between the Bahekou and Huangnihe towns,Jilin Province. Aegirine trachytes are characterized by enrichment in alkaline minerals represented by aegirine,conformably overlying the alkaline basalt of Chuanfishan Period. Whole-rock K--Ar isotopic dating reveals ages of 25. 64 ± 0. 53 Ma,27. 36 ± 0. 45 Ma,28. 45 ± 0. 56 Ma,28. 55 ± 0. 43 Ma,28. 63 ±0. 45 Ma and 28. 65 ± 0. 61 Ma,which belong to Oligocene. The geochemical analysis shows average SiO_2 content of 59. 05 % for the aegirine trachytes,with high alkaline and enriched K_2O contents. They are depleted in LILEs( Sr,Ba,V,Cr) and enriched in HFSEs( Nb,Ta,Hf,Zr) and LREE,with high ∑REE abundances,right-inclined REE distribution patterns and obvious negative Eu anomalies. Integrating all the results,it is indicated that the aegirine trachytes were derived from strongly fractioned crystallization of alkaline basaltic magma,under an intensive extensional setting during Oligocene and the mantle-derived magma evolved from alkaline basalt to aegirinetrachyte.
Aegirine trachytes were newly recognized in northern Dunhua--Mishan fault belt,between the Bahekou and Huangnihe towns,Jilin Province. Aegirine trachytes are characterized by enrichment in alkaline minerals represented by aegirine,conformably overlying the alkaline basalt of Chuanfishan Period. Whole-rock K--Ar isotopic dating reveals ages of 25. 64 ± 0. 53 Ma,27. 36 ± 0. 45 Ma,28. 45 ± 0. 56 Ma,28. 55 ± 0. 43 Ma,28. 63 ±0. 45 Ma and 28. 65 ± 0. 61 Ma,which belong to Oligocene. The geochemical analysis shows average SiO_2 content of 59. 05 % for the aegirine trachytes,with high alkaline and enriched K_2O contents. They are depleted in LILEs( Sr,Ba,V,Cr) and enriched in HFSEs( Nb,Ta,Hf,Zr) and LREE,with high ∑REE abundances,right-inclined REE distribution patterns and obvious negative Eu anomalies. Integrating all the results,it is indicated that the aegirine trachytes were derived from strongly fractioned crystallization of alkaline basaltic magma,under an intensive extensional setting during Oligocene and the mantle-derived magma evolved from alkaline basalt to aegirinetrachyte.
引文
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[14]王焰,钱青,刘良,等.不同构造环境中双峰式火山岩的主要特征[J].岩石学报,2000/16(2):169-173.WANG Yan, QIAN Qing, LIU Liang, et al. Major geo-chemical characteristics of bimodal volcanic rocks in different geochemical environments[J]. Acta Petrologica Sinice,2000,16(2):169-173.
[15] Christiansen R L. Yellow stone magmatic evolution:its bearing on understanding large-volume explosive volcanism[C]∥Explowive Volcanism:Inception, Evolution and Hazards. Washington D C:National Academy Press,1984:84-95.
[16] Geist D,Howard K A,Larson P. The generation of oceanic rhyolites by crystal fractionation:the basait-rhyolite association at Volcan Alcedo,Galapagos Archipelago[J]. Journal of Petrology,1995,36:965-982.
[17]王银喜,顾连兴,张遵忠,等.博格达裂谷双峰式火山岩地质年代学与Nd--Sr--Pb同位素地球化学特征[J].岩石学报,2006,22(5):1215-1224.WANG Yin-xi,GU Lian-xing,ZHANG Zun-zhong,et al. Geochemistry and Nd--Sr--Pb isotopes of the bimodal volcanic rocks of the Bogda rift[J]. Acta Petrologica Sinica,2006,22(5):1215-1224.
[18] Campbell I H. Implications of Nb/U,Th/U and Sm/Nd in plume magmas for the relationship between continental and oceanic crust formation and the depleted mantle[J]. Geochemica et Cosmochimica Acta,2002,66(9):1651-1661.
[19] Miller C,Schuster R,Klotzli U,et al. Post-collisional potassic and ultrapotassic magmatism in SW Tibet geochemical and Sr--Nd--Pb--O isotopic constraints for mantle source characteristics and petrogenesis[J]. Journal of Petrology,1999,40(9):1399-1424.
[20] Dungan M A,Lind Strom M M,Mcmiland N J,et al.Open system magmatic evolution of the Taos Plateau volcanic field northern New Mexico,1:the petrology and geochemistry of the Servillets basalts[J]. J Geophy Res,1986,91:5999-6028.
[21]孟凡超,刘嘉麒,崔岩.松辽盆地徐家围子断陷营城组粗面岩成因与引爆机制[J].吉林大学学报(地球科学版),2013,43(3):704-715.MENG Fan-chao, LIU Jia-qi, CUI Yan. Petrogensis and crypto-explosive mechanism of trachyte in Yingcheng Formation of Xujiawei fault depression,Songliao Basin,NE China[J]. Journal of Jilin Uvinersity(Earth Science Edition),2013,43(3):704-715.
[22]邓晋福,罗照华,苏上国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004:46-84.DENG Jin-fu,LUO Zhao-hua,SU Shang-guo,et al.Petrgenesis,tectonic setting and mineralization[M].Beijing:Geological Publishing House,2004:46-84.
[23]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,1992:74-88.LI Chang-nian. Trace element petrology of igneous rock[M]. Wuhan:China University of Geosciences Press,1992:74-88.
[24]刘书生,范文玉,罗茂金,等.老挝南部帕莱通双峰式火山岩锆石U-Pb定年及岩石地球化学特征[J].吉林大学学报(地球科学版),2014,44(2):540-553.LIU Shu-sheng, FAN Wen-yu, LUO Mao-jin, et al.Zircon U-Pb dating and geochemistry characteristics of the bimodal volcanic rocks in Phlaythong area,southern Laos[J]. Journal of Jilin Uvinersity(Earth Science Edition),2014,44(2):540-553.
[25] Weaver B L. Trace element evidence for the origin of ocean-island basalts[J]. Geology, 1991, 19:123-126.
[26]王涛,王宗起,闫全人,等.南秦岭白水江群变基性火山岩块体的形成时代及其地球化学特征[J].岩石学报,2011,27(3):646-656.WANG Tao,WANG Zong-qi,YAN Quan-ren,et al.The formation age and geochemical characteristics of the metavolcanic rock blocks of the Baishuijiang Group in South Qinling[J]. Acta Petrologica Sinica,2011,27(3):645-656.
[27]樊祺诚,隋建立,王团华,等.长白山天池火山粗面玄武岩的喷发历史与演化[J].岩石学报,2006,22(6):1449-1457FAN Qi-cheng,SUI Jian-li,WAN Tuan-hua,et al. Eruption history magma evolution of the trachybasalt in the Tianchi volcano,Changbaishan[J]. Acta Potrologica Sinica,2006,22(6):1449-1457.
[2]刘嘉麒.中国东北地区新生代火山幕[J].岩石学报,1988,4(1):1-10.LIU Jia-qi The Cenozoic volcanic episodes in Northeast China[J]. Acta Petrologica Sinica,1988,4(1):1-10.
[3]刘若新.中国新生代火山岩年代学与地球化学[M].北京:地震出版社,1992:1-43.LIU Ruo-xin. Chronology and geochemistry of Cenozoic volcanic rock in China[M]. Beijing:Seismological Press,1992:1-43.
[4]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.YUAN Hong-lin,WU Fu-yuan,GAO Shan,et al. Zircon U-Pb dating and analysis of rare earth elements in Genozoic intrusions in northeastern China[J]. Chinese Science Bulletin,2003,48(14):1151-1520.
[5]李碧乐,孙风月,姚凤良.中生代敦化—密山断裂大规模左旋平移及其对金矿床形成的控制作用[J].大地构造与成矿学,2002,26(4):390-395.LI Bi-le,SUN Feng-yue,YAO Feng-liang. Large scale sinstral strike-slip movement of Dunhua-Mishan fracture zong and its control on gold metallogeny in the Mesozoic[J]. Geotectionica et Mettallogenia,2002,26(4):390-395.
[6]孙甲富,杨建国,张俊影,等.敦密断裂带新生代岩浆旋回及喜山期构造运动的划分[J].吉林地质,2012,31(4):15-22.SUN Jia-fu,YANG Jian-guo,ZHANG Jun-ying,et al.Division of Dunmi fault zone Cenozoic magmatic cycle and Himalayan period tectonic movement[J]. Jilin Geology,2012,31(4):15-22.
[7]于宏斌,乔国华,彭玉鲸,等.吉黑地区新生代船底山玄武岩正名极其意义[J].世界地质,2009,28(4):485-490.YU Hong-bin,QIAO Guo-hua,PENG Yu-jing,et al.Correcting name on Cenozoic Chuandishan basalt in Jihei area and its significance[J]. Global Geology,2009,28(4):485-490.
[8]刘嘉麒.中国东北地区新生代火山岩的年代学研究[J].岩石学报,1987,3(4):21-31.LIU Jia-qi. Study on geochronology of the Cenozoic volcanic rocks in Northeast China[J]. Acta Petrologica Sinica,1987,3(4):21-31.
[9]彭玉鲸,张允平,李景春.中国东北晚白垩世新生代火山资源环境[R].沈阳地质矿产调查研究所,2007:1-279.PENG Yu-jing,ZHANG Yun-ping,LI Jing-chun. Late Crataceous Cenozoic volcanic resources and environment of Northeast China[R]. Shenyang Institute of Geologyand Mineral Resources,2007:1-279.
[10]迟清华,鄢明才.应用地球化学元素丰度数据手册[M].北京:地质出版社,2007:21-23.CHI Qing-hua,YAN Ming-cai. A handbook for the applied geochemical elment abundance data[M]. Beijing:Geological Publishing House,2007:21-23.
[11] Taylor S R,McLennan S M. The continental crust:its composition and evolution[M]. Oxford:Black-well,1985:312.
[12] Hofmann A W. Mantle geochemistry:the message from oceanic volcanism[J]. Nature, 1997, 385:219-229.
[13]孙晓猛,刘永江,孙庆春,等.敦密断裂带走滑运动的40Ar/39Ar年代学证据[J].吉林大学学报(地球科学版),2008,38(6):965-972.SUN Xiao-meng,LIU Yong-jiang,SUN Qing-chun,et al.40Ar/39Ar geochronology evidence of strike-slip movement in Dunhua-Mishan fault zone[J]. Journal of Jilin Uvinersity(Earth Science Edition),2008,38(6):965-972.
[14]王焰,钱青,刘良,等.不同构造环境中双峰式火山岩的主要特征[J].岩石学报,2000/16(2):169-173.WANG Yan, QIAN Qing, LIU Liang, et al. Major geo-chemical characteristics of bimodal volcanic rocks in different geochemical environments[J]. Acta Petrologica Sinice,2000,16(2):169-173.
[15] Christiansen R L. Yellow stone magmatic evolution:its bearing on understanding large-volume explosive volcanism[C]∥Explowive Volcanism:Inception, Evolution and Hazards. Washington D C:National Academy Press,1984:84-95.
[16] Geist D,Howard K A,Larson P. The generation of oceanic rhyolites by crystal fractionation:the basait-rhyolite association at Volcan Alcedo,Galapagos Archipelago[J]. Journal of Petrology,1995,36:965-982.
[17]王银喜,顾连兴,张遵忠,等.博格达裂谷双峰式火山岩地质年代学与Nd--Sr--Pb同位素地球化学特征[J].岩石学报,2006,22(5):1215-1224.WANG Yin-xi,GU Lian-xing,ZHANG Zun-zhong,et al. Geochemistry and Nd--Sr--Pb isotopes of the bimodal volcanic rocks of the Bogda rift[J]. Acta Petrologica Sinica,2006,22(5):1215-1224.
[18] Campbell I H. Implications of Nb/U,Th/U and Sm/Nd in plume magmas for the relationship between continental and oceanic crust formation and the depleted mantle[J]. Geochemica et Cosmochimica Acta,2002,66(9):1651-1661.
[19] Miller C,Schuster R,Klotzli U,et al. Post-collisional potassic and ultrapotassic magmatism in SW Tibet geochemical and Sr--Nd--Pb--O isotopic constraints for mantle source characteristics and petrogenesis[J]. Journal of Petrology,1999,40(9):1399-1424.
[20] Dungan M A,Lind Strom M M,Mcmiland N J,et al.Open system magmatic evolution of the Taos Plateau volcanic field northern New Mexico,1:the petrology and geochemistry of the Servillets basalts[J]. J Geophy Res,1986,91:5999-6028.
[21]孟凡超,刘嘉麒,崔岩.松辽盆地徐家围子断陷营城组粗面岩成因与引爆机制[J].吉林大学学报(地球科学版),2013,43(3):704-715.MENG Fan-chao, LIU Jia-qi, CUI Yan. Petrogensis and crypto-explosive mechanism of trachyte in Yingcheng Formation of Xujiawei fault depression,Songliao Basin,NE China[J]. Journal of Jilin Uvinersity(Earth Science Edition),2013,43(3):704-715.
[22]邓晋福,罗照华,苏上国,等.岩石成因、构造环境与成矿作用[M].北京:地质出版社,2004:46-84.DENG Jin-fu,LUO Zhao-hua,SU Shang-guo,et al.Petrgenesis,tectonic setting and mineralization[M].Beijing:Geological Publishing House,2004:46-84.
[23]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,1992:74-88.LI Chang-nian. Trace element petrology of igneous rock[M]. Wuhan:China University of Geosciences Press,1992:74-88.
[24]刘书生,范文玉,罗茂金,等.老挝南部帕莱通双峰式火山岩锆石U-Pb定年及岩石地球化学特征[J].吉林大学学报(地球科学版),2014,44(2):540-553.LIU Shu-sheng, FAN Wen-yu, LUO Mao-jin, et al.Zircon U-Pb dating and geochemistry characteristics of the bimodal volcanic rocks in Phlaythong area,southern Laos[J]. Journal of Jilin Uvinersity(Earth Science Edition),2014,44(2):540-553.
[25] Weaver B L. Trace element evidence for the origin of ocean-island basalts[J]. Geology, 1991, 19:123-126.
[26]王涛,王宗起,闫全人,等.南秦岭白水江群变基性火山岩块体的形成时代及其地球化学特征[J].岩石学报,2011,27(3):646-656.WANG Tao,WANG Zong-qi,YAN Quan-ren,et al.The formation age and geochemical characteristics of the metavolcanic rock blocks of the Baishuijiang Group in South Qinling[J]. Acta Petrologica Sinica,2011,27(3):645-656.
[27]樊祺诚,隋建立,王团华,等.长白山天池火山粗面玄武岩的喷发历史与演化[J].岩石学报,2006,22(6):1449-1457FAN Qi-cheng,SUI Jian-li,WAN Tuan-hua,et al. Eruption history magma evolution of the trachybasalt in the Tianchi volcano,Changbaishan[J]. Acta Potrologica Sinica,2006,22(6):1449-1457.