浙东南松阳县枫坪组沉积岩碎屑锆石年代学及地质意义
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摘要
利用激光剥蚀电感耦合等离子质谱技术(LA-ICP-MS)对浙东南松阳县枫坪组地层底部的细砂岩进行了锆石U-Pb定年及稀土元素分析。样品中大部分碎屑锆石具有较好的振荡环带且Th/U值大于0. 1,表明其为岩浆成因。碎屑锆石中稀土元素含量变化范围较大,(La/Yb)_N值为0～0. 29,LREE/HREE值为0. 003×10~(-6)～0. 977×10~(-6),表明样品中锆石的轻、重稀土元素分异程度较小且重稀土元素相对富集,具有轻稀土元素含量低、重稀土元素含量高的左倾模式且具有负Eu异常、正Ce异常的特征,表明碎屑锆石主要以岩浆锆石为主,同时存在少量的变质锆石。碎屑锆石U-Pb测年结果表明,最年轻的锆石年龄为193 Ma,显示枫坪组沉积岩成岩年龄不晚于193 Ma。碎屑锆石年龄可分为4组,分别为2 461～1 743 Ma、887 Ma、435和422 Ma、330～193 Ma。碎屑锆石的主要年龄区间分别与已知的构造-岩浆热事件时间相对应(吕梁期、晋宁期、加里东期和印支-海西期),表明本区的构造岩浆活动与中国大地构造运动相一致,并具有幕式发展的特征。通过对枫坪组沉积岩碎屑锆石U-Pb年龄的系统分析并与可能物源区的年代学对比研究,认为枫坪组沉积岩物质来源主要是周边出露的中条期侵入岩体和浙东南出露的印支期花岗岩体。
The rare earth elements characteristics of detrital zircons and the U-Pb age of detrital zircons of finegrained sandstone from Fengping Formation were investigated by the LA-ICP-MS analytical technique. The detrital zircons have a good oscillatory zones and Th/U ratios of most zircons are higher than 0. 1,indicating that they are of magmatic origin. The content of REE varies in a large range. The ratios of( La/Yb)_N( 0 ～ 0. 29) and LREE/HREE( 0. 003 × 10~(-6)～ 0. 977 × 10~(-6)) show the relative enrichment of HREE. The distribution pattern of rare earth elements in detrital zircons exhibits mainly low content of LREE and high content of HREE as well as Eu negative anomaly and Ce positive anomaly. The result shows that the majority of zircons originated from magmatic source,whereas some other zircons originated from metamorphic activity. The youngest U-Pb age of detrital zircon is 193 Ma,indicating that its diagenetic age is not later than 193 Ma. The data suggest that zircons are mainly composed of 4 age stages,including 2 461 ～ 1 743 Ma,887 Ma,435 and 422 Ma,330 ～ 193 Ma,respectively,corresponding to the known tectonic-magmatic thermal events( Lüliang Movement,Jinning Movement,Caledonian Movement,Indosinian-Hercynian Movement). The result reveals that the tectonic magmatism in this area is consistent with the tectonic activity in China,and it has the characteristics of continuous development. Through the systematic analysis of the U-Pb dating data of detrital zircons from the sedimentary rock of Fengping Formation and chronology of possible provenances,it is shown that the materials for sedimentation was from surrounding rock mass of Zhongtiao Movement and the Indosinian granite body in southeastern Zhejiang.
The rare earth elements characteristics of detrital zircons and the U-Pb age of detrital zircons of finegrained sandstone from Fengping Formation were investigated by the LA-ICP-MS analytical technique. The detrital zircons have a good oscillatory zones and Th/U ratios of most zircons are higher than 0. 1,indicating that they are of magmatic origin. The content of REE varies in a large range. The ratios of( La/Yb)_N( 0 ～ 0. 29) and LREE/HREE( 0. 003 × 10~(-6)～ 0. 977 × 10~(-6)) show the relative enrichment of HREE. The distribution pattern of rare earth elements in detrital zircons exhibits mainly low content of LREE and high content of HREE as well as Eu negative anomaly and Ce positive anomaly. The result shows that the majority of zircons originated from magmatic source,whereas some other zircons originated from metamorphic activity. The youngest U-Pb age of detrital zircon is 193 Ma,indicating that its diagenetic age is not later than 193 Ma. The data suggest that zircons are mainly composed of 4 age stages,including 2 461 ～ 1 743 Ma,887 Ma,435 and 422 Ma,330 ～ 193 Ma,respectively,corresponding to the known tectonic-magmatic thermal events( Lüliang Movement,Jinning Movement,Caledonian Movement,Indosinian-Hercynian Movement). The result reveals that the tectonic magmatism in this area is consistent with the tectonic activity in China,and it has the characteristics of continuous development. Through the systematic analysis of the U-Pb dating data of detrital zircons from the sedimentary rock of Fengping Formation and chronology of possible provenances,it is shown that the materials for sedimentation was from surrounding rock mass of Zhongtiao Movement and the Indosinian granite body in southeastern Zhejiang.
引文
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Lei Weiyan,Shi Guanghai and Liu Yingxin.2013.Research progress on trace element chaecateristics of zircons of different origins[J].Earth Science,20(4):173~284(in Chinese with English abstract).
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Viola G and Anczkieviczr.2008.Exhumation history of the Red River shear zone in northern Vietnam:New insights from zirconand apatite fission-track analysis[J].Journal of Asian Earth Sciences,33(1/2):78~90.
Xia Y,Xu X S and Zhu K Y.2012.Paleoproterozoic S-and A-type granites in southwestern Zhejiang:Magmatism,metamorphism and implications for the crustal evolution of the Cathaysia basement[J].Precambrain Research,216~219(9):177~210.
Yang S,Ma C Q,Liu Y Y,et al.2011.Geochronological and geochemical constraints on The petrogenesis of late Triassic aluminous A-type graintes in southeast China[J].Journal of Asian Earth Sciences,42(6):1 117~1 131.
Yu J H,Wang L,O Reilly S,et al.2009.A Paleoproterozoic orogeny recorded in a long-lived Cratonic remnant,eastern Cathaysia Block,China[J].Precambrain Research,174(3):347~363.
甘晓春,李惠民,孙大中,等.1995.浙西南早元古代花岗质岩石的年代[J].岩石矿物学杂志,14(1):1~8.
高万里,王宗秀,李春麟,等.2014.浙东南印支期花岗岩的锆石U-Pb年代学、地球化学及构造意义[J].地质学报,88(6):1 055~1 067.
兰中伍,陈岳龙,苏本勋,等.2006.四川松潘-甘孜盆地砂岩的物质来源:来自锆石U-Pb(SHRIMP)年龄证据[J].沉积学报,24(3):321~332.
雷开宇.2015.鄂尔多斯盆地杭锦旗地区直罗组碎屑锆石稀土元素特征及地质意义[J].延安大学学报(自然科学版),34(4):58~62.
雷玮琰,施光海,刘迎新.2013.不同成因锆石的微量元素特征研究进展[J].地学前缘,20(4):273~284.
李万友,马昌前,刘园园,等.2012.浙江印支期铝质A型花岗岩的发现及其地质意义[J].中国科学:地球科学,42(2):164~177.
李小聪,王安东,万建军,等.2016.赣江流域(南昌段)水系沉积物物源示踪研究:来自锆石U-Pb同位素证据的约束[J].现代地质,30(3):514~527.
毛建仁,厉子龙,叶海敏.2014.华南中生代构造-岩浆活动研究:现状与前景[J].中国科学(D辑)地球科学,44(12):2 593~2 617.
王伟,刘成东,刘江浩,等.2012.浙江松阳萤石矿床地质特征及成矿条件分析[J].东华理工大学学报(自然科学版),35(1):66~74.
(1)汪建国,余盛强,吴鸣,等. 2013. 1∶250 000衢州市区域地质调查报告.
Gan Xiaochun,Li Huimin,Sun Dazhong,et al.1995.A geochronolgical study on Early Proterozoic granitic rocks,Southwestern Zhejiang[J].Acta Petrologica et Mineralogica,14(1):1~8(in Chinese with English abstract).
Gao Wanli,Wang Zongxiu,Li Chunlin,et al.2014.Zircon U-Pb geochronogy,geochemistry and tectonic implication of Indosinian granite from Southeastern Zhejiang,South China[J].Acta Geologica Sinica,88(6):1 055~1 067(in Chinese with English abstract).
Gehrels G J,Jojnsson M J and Howell D G.1999.Detrital zircon geochronology of the Adams Argillite and Nation River Formation,eastcentral Alaska,USA[J].Journal of Sedimentary Research,69(1):135~144.
Lan Zhongwu,Chen Yuelong,Su Benxun,et al.2006.The origin of sandstones from the Songpan-Ganze Basin,Sichuan,China:Evidence from SHRIMP U-Pb dating of clastic zircons[J].Acta Sedimentologica Sinica,24(3):321~332(in Chinese with English abstract).
Lei Kaiyu.2015.Rare earth elements of detrital zircon characteristics and geological significance of Zhiluo Formation in Hangjinqi area,Ordos Basin[J].Journal of Yanan University(Natural Science Edition),34(4):58~62(in Chinese with English abstract).
Lei Weiyan,Shi Guanghai and Liu Yingxin.2013.Research progress on trace element chaecateristics of zircons of different origins[J].Earth Science,20(4):173~284(in Chinese with English abstract).
Li Wanyou,Ma Changqian,Liu Yuanyuan,et al.2012.Discovery of the Indosinian aluminum A-type granite in Zhejiang Province and its geological significance[J].Sci.China Earth Sci.,55:13~25(in Chinese with English abstract).
Li Xiaocong,Wang Andong,Wan Jianjun,et al.2016.Tracing the stream sediment of the Ganjiang River(Nanchang Section):Constraint from the detrital zircon U-Pb isotope evidence[J].Geoscience,30(3):514~527(in Chinese with English abstract).
Ludwing K R.2003.Users Manual for Isoplot/Ex.Version3.00:A Geochronological Toolkit for Microsoft Excel[M].Berkeley:Berkeley Geochronology Center Special Publication,(3):1~70.
Mao Jianren,Li Zilong and Ye Haimin.2014.Mesozoic tectono-magmatic activities in South China:Retrospect and prospect[J].Science China:Earth Sciences,57:2 853~2 877(in Chinese with English abstract).
Taylor S R and Mclennan S M.1985.The Continental Crust:Its Composition and Evolution[M].Oxford:Blackwell Scientific Publications,1~312.
Wang Wei,Liu Chengdong,Liu Jianghao,et al.2012.Geological characteristics and metallogenic condition analysis in songyang fluorite ore deposit[J].Journal of East China Institute of Technology(Natural Science Edition),35(1):66~74(in Chinese with English abstract).
Viola G and Anczkieviczr.2008.Exhumation history of the Red River shear zone in northern Vietnam:New insights from zirconand apatite fission-track analysis[J].Journal of Asian Earth Sciences,33(1/2):78~90.
Xia Y,Xu X S and Zhu K Y.2012.Paleoproterozoic S-and A-type granites in southwestern Zhejiang:Magmatism,metamorphism and implications for the crustal evolution of the Cathaysia basement[J].Precambrain Research,216~219(9):177~210.
Yang S,Ma C Q,Liu Y Y,et al.2011.Geochronological and geochemical constraints on The petrogenesis of late Triassic aluminous A-type graintes in southeast China[J].Journal of Asian Earth Sciences,42(6):1 117~1 131.
Yu J H,Wang L,O Reilly S,et al.2009.A Paleoproterozoic orogeny recorded in a long-lived Cratonic remnant,eastern Cathaysia Block,China[J].Precambrain Research,174(3):347~363.
甘晓春,李惠民,孙大中,等.1995.浙西南早元古代花岗质岩石的年代[J].岩石矿物学杂志,14(1):1~8.
高万里,王宗秀,李春麟,等.2014.浙东南印支期花岗岩的锆石U-Pb年代学、地球化学及构造意义[J].地质学报,88(6):1 055~1 067.
兰中伍,陈岳龙,苏本勋,等.2006.四川松潘-甘孜盆地砂岩的物质来源:来自锆石U-Pb(SHRIMP)年龄证据[J].沉积学报,24(3):321~332.
雷开宇.2015.鄂尔多斯盆地杭锦旗地区直罗组碎屑锆石稀土元素特征及地质意义[J].延安大学学报(自然科学版),34(4):58~62.
雷玮琰,施光海,刘迎新.2013.不同成因锆石的微量元素特征研究进展[J].地学前缘,20(4):273~284.
李万友,马昌前,刘园园,等.2012.浙江印支期铝质A型花岗岩的发现及其地质意义[J].中国科学:地球科学,42(2):164~177.
李小聪,王安东,万建军,等.2016.赣江流域(南昌段)水系沉积物物源示踪研究:来自锆石U-Pb同位素证据的约束[J].现代地质,30(3):514~527.
毛建仁,厉子龙,叶海敏.2014.华南中生代构造-岩浆活动研究:现状与前景[J].中国科学(D辑)地球科学,44(12):2 593~2 617.
王伟,刘成东,刘江浩,等.2012.浙江松阳萤石矿床地质特征及成矿条件分析[J].东华理工大学学报(自然科学版),35(1):66~74.
(1)汪建国,余盛强,吴鸣,等. 2013. 1∶250 000衢州市区域地质调查报告.
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