唐增才,董学发,孟祥随,赵旭东,余盛强,吴小勇,胡开明,陈忠大

• 1:浙江省地质调查院
• 2:中国地质大学地球科学学院

摘要(Abstract)：

浙江神仙居濒临西太平洋火山岩带,晚中生代构造—岩浆活动频繁,堆积了巨厚的火山沉积地层,是研究晚中生代大陆边缘形成演化动力学过程的重要窗口之一。区内主体为一套流纹质熔结凝灰岩,岩石SiO_2含量为74.17%~78.38%,Al_2O_3含量为11.16%~13.14%,全碱(K_2O+Na_2O)含量为6.44%~8.76%,属高钾钙碱性系列;稀土总量(ΣREE)介于144.5×10~(-6)~247.1×10~(-6)之间,ΣLREE/ΣHREE=5.58~6.81,LaN/YbN=5.17~8.59,δEu为0.17~0.23,弱富集K、Rb,亏损Ba、Sr等大离子亲石元素,相对富集U、Th,亏损Nb、Ta、Ti等高场强元素。LA-ICP-MS锆石U-Pb定年表明,神仙居流纹质熔结凝灰岩同位素年龄集中于(113.4±1.4)Ma~(114.4±1.5)Ma,是早白垩世晚期区域伸展拉张的构造背景下玄武质岩浆底侵作用诱发的地壳部分熔融的产物,层位归属小平田组。

关键词(KeyWords)： 化学地层,;锆石LA-ICP-MS U-Pb年龄;地层划分;地球化学;晚中生代;浙江

Abstract:

Keywords:

基金项目(Foundation): 中国地质调查局《浙江区域地质调查片区总结与服务产品开发》(编号:12120114068901);; 浙江省国土资源厅《浙江省中生代火山活动时空演化规律研究》(编号:2017003)项目联合资助

作者(Author): 唐增才,董学发,孟祥随,赵旭东,余盛强,吴小勇,胡开明,陈忠大

DOI: 10.19839/j.cnki.dcxzz.2018.02.005

参考文献(References)：

• 蔡正全,俞云文.2001.浙江白垩系上部地层的划分与对比.地层学杂志,25(4):259-266.
• 段政,邢光福,余明刚,赵希林,靳国栋,陈志洪.2013.浙闽边界区晚中生代火山作用时序与过程分析.地质论评,59(3):454-469.
• 华仁民,陈培荣,张文兰,刘晓东,陆建军,林锦富,姚军明,戚华文,张展适,顾晟彦.2003.华南中、新生代与花岗岩类有关的成矿系统.中国科学(D辑),33(4):335~343.
• 金庆花,李春麟,王宗秀.2015.浙江景宁岩体岩石地球化学特征与LA-ICP-MS锆石U-Pb年龄.地质通报,34(2-3):456-465.
• 李祥辉,陈斯盾,罗家洪,王尹,曹珂,刘玲.2011.浙江西部建德群锆石LA-ICP-MS之U-Pb同位素年龄及其地层学意义.地质论评,57(6):825-836.
• 刘亮,邱检生,李真.2011.浙江沐尘石英二长岩及其镁铁质包体的锆石U-Pb年龄和Hf同位素组成--对岩浆混合作用的示踪.地质论评,57(3):327-336.
• 刘亮,邱检生,杨泽黎.2013.浙江临海猫狸岭岩体的成因:年代学、地球化学与Sr-Nd-Hf同位素制约.岩石学报,29(12):4069-4086.
• 马武平.1997.浙江省中生代晚期地层多重划分对比新认识.中国区域地质,16(2):123-129.
• 马之力,李建华,张岳桥,董树文,宋传中,李勇.2016.浙江南部丽水盆地地层时代及构造演化.中国地质,43(1):56-71.
• 毛建仁,高桥浩,厉子龙,中岛隆,叶海敏,赵希林,周洁,胡青,曾庆涛.2009.中国东南部与日本中-新生代构造-岩浆作用对比研究.地质通报,28(7):844-856.
• 钱迈平,张宗言,余明刚,马雪,姜杨,邢光福,丁保良,陈其奭.2015.浙东石浦组叠层石-虫管生物礁灰岩地层的年龄与沉积相.地层学杂志,39(2):169-187.
• 唐增才,陈忠大,胡文杰,董学发,吴小勇,袁强.2016.浙西余临富交界区中生代侵入岩年代学、地球化学特征及其地质意义.地质学报,90(3):451-467.
• 陶奎元,邢光福,杨祝良,毛建仁,赵宇,许乃政.2000.浙江中生代火山岩时代厘定和问题讨论:兼评Lapierre等关于浙江中生代火山活动时代的论述.地质论评,46(1):14-21.
• 王加恩,刘远栋,汪建国,王振,陶丽.2016.浙江丽水地区磨石山群火山岩时代归属.华东地质,37(3):157-165.
• 王加恩,刘远栋,王振.2015.浙江省丽水地区白垩纪红层盆地火山岩年龄及其构造意义.现代地质,29(4):873-883.
• 王学寅,胡文瑄,胡广,姚素平,曹剑,王小林,谢小敏.2012.浙江石浦下白垩统灰岩微相分析与锆石U-Pb年代学研究.地质论评,58(4):614-626.
• 邢光福,卢清地,陈荣,张正义,聂童春,李龙明,黄家龙,林敏.2008.华南晚中生代构造体制转折结束时限研究.地质学报,82(4):451-463.
• 俞云文,徐步台.1999.浙江中生代晚期火山-沉积岩系层序和时代.地层学杂志,23(2):136-145.
• 张国全,王勤生,俞跃平,杨超,肖娟.2012.浙江东部火山岩地区的地层时代和划分.地层学杂志,36(3):641-652.
• 张岳桥,徐先兵,贾东,舒良树.2009.华南早中生代从印支期碰撞构造体系向燕山期俯冲构造体系转换的形变记录.地学前缘,16(1):234-247.
• Bacon C R&Druitt T H.1988.Compositional evolution of the zoned calcalkaline magma chamber of Mount Mazama,Crater Lake,Oregon.Contributions to Mineralogy and Petrology,98(2):224-256.
• Bas M J L,Lemaitre R W,Strekeisen A&Zanettin B.1986.A chemical classification of volcanic rocks based on the total alkalisilica diagram.Journal of Petrology,27(3):745-750.
• Bonin B.2004.Docoeval mafic and felsic magmas in post-collisional to within-plate regimes necessarily imply two contrasting,mantle and crustal,sources?a review.Lithos,78(1-2):1-24.
• Ding X,Sun W D,Chen W F,Chen P R,Sun T,Sun S J,Lin C T&Chen F K.2014.Multiple Mesozoic magma processes formed the 240~185Ma composite Weishan pluton,South China:evidence from geochronology,geochemistry,and Sr-Nd isotopes.International Geology Review,57(9-10):1-29.
• Guffanti M,Clynne M A&Muffler L.1996.Thermal and mass implications of magmatic evolution in the Lassen volcanic region,California,and minimum constraints on basalt influx to the lower crust.Journal of Geophysical Research:Solid Earth(1978~2012),101(B2):3003-3013.
• Harris N B W,Pearce J A&Tindle A G.1986.Geochemical characteristics of collision zone magmatism.Geological Society,19(1):67-81.
• Hu Z C,Liu Y S,Gao S,Xiao S Q,Zhao L S,Günther D,Li M,Zhang W&Zong K Q.2012.A“wire”signal smoothing device for laser ablation inductively coupled plasma mass spectrometry analysis.Spectrochimica Acta,Part B:Atomic Spectroscopy,78(0):50-57.
• Li J H,Ma Z L,Zhang Y Q,Dong S W,Li Y,Lu M A&Tan J Q.2014.Tectonic evolution of Cretaceous extensional basins in Zhejiang Province,eastern South China:structural and geochronological constraints.International Geology Review,56(13):1602-1629.
• Li X H.2000.Cretaceous magmatism and lithospheric extension in Southeast China.Journal of Asian Earth Sciences,18(3):293-305.
• Liégeois J P,Navez J,Hertogen J&Black R.1998.Contrasting origins of ostcollisional high-K calc-alkaline-shoshonitic and alkaline-peralkaline granitoids.The use of sliding normalization.Lithos,45:1-28.
• Liu L,Xu X S&Xia Y.2014.Cretaceous Pacific plate movement beneath SE China:evidence from episodic volcanism and related intrusions.Tectonophysics,614(3):170-184.
• Liu L,Xu X S&Zou H B.2012.Episodic eruptions of the Late Mesozoic volcanic sequences in southeastern Zhejiang,SE China:Petrogenesis and implications for the geodynamics of paleo-Pacific subduction.Lithos,154(4):166-180.
• Liu L,Qiu J S&Zhao J L.2016.A hybrid origin for two Cretaceous monzonitic plutons in eastern Zhejiang Province,Southeast China:geoc hronological,geochemical,and Sr-Nd-Hf isotopic evidence.Journal of Asian Earth Sciences,115:183-203.
• Liu Y S,Zong K Q,Kelemen P B&Gao S.2008.Geochemistry and magmatic history of eclogites and ultramafic rocks from the Chinese continental scientific drill hole:subduction and ultrahigh pressure metamorphism of lower crustal cumulates.Chemical Geology,247:133-153.
• Liu Y S,Gao S,Hu Z C,Gao C G,Zong K Q&Wang D B.2010.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons of mantle xenoliths.Journal of Petrology,51(1&2):537-571.
• Maniar P D&Piccoli P M.1989.Tectonic discrimination of granitoids.Geological Society of America,Bulletin 101:635-643.
• Rapp R P&Watson E B.1995.Dehydration melting of metabasalt at 8-32kbar:implications for continental growth and crust-mantle recycling.Journal of Petrology,36(4):891-931.
• Sun S S&Mc Donough W F.1989.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes//Saunders A D&Norry M J.Magmatism in the Ocean Basins.Geological Society,Special Publication 42:313-345.
• Tepper J H,Nelson B K,Bergantz G W&Irving A J.1993.Petrology of the Chilliwack batholith,North Cascades,Washington:generation of calc-alkaline granitoids by melting of mafic lower crust with variable water fugacity.Contributions to Mineralogy and Petrology,113(3):333-351.
• Wu F Y,Ji W Q,Sun D H,Yang Y H&Li X H.2012.Zircon U-Pb geochronology and Hf isotopic compositionsof the Mesozoic granites in southern Anhui Province,China.Lithos,150:6-25.