安徽铜陵矿集区南部新生代岩浆活动——来自科学深钻TK01的证据
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摘要
本文主要是对铜陵矿集区南部丁桥科学深钻中的碱性辉长岩进行了LA-MC-ICPMS锆石U-Pb定年,年龄为63.54±0.53 Ma,表明碱性辉长岩是新生代岩浆侵入活动的产物。全岩主、微量研究结果表明TK01中的碱性辉长岩富钾(K_2O平均为1.75%)、富碱(K_2O+Na_2O平均为3.90%)、富钛(TiO_2平均为1.58%),富集大离子不相容元素和轻稀土元素,亏损重稀土元素,属于过铝质岩石。SiO_2-K_2O图解中,样品点落在含钾较高的钾玄岩和钙碱性区域中,岩浆演化过程中有矿物的分离结晶作用。碱性辉长岩的锆石εHf(t)值介于-4.7~-11.5。推测TK01中的碱性辉长岩主要来源于富集地幔,稍有陆壳物质的混染,岩浆形成于大陆板内拉张的构造背景。
LA-MC-ICP MS zircon U-Pb dating yielded the age of 63. 54 ± 0. 53 Ma for alkali gabbro from science deep drilling TK01 in Dingqiao, southern Tongling ore district. The age of alkali gabbro indicates intrusive magma activity in Cenozoic period. Major and trace elements suggest these igneous rocks in TK01 are characterized by high content of potassium(K_2O 1. 75% on average), rich alkali(K_2O + Na_2O 3. 90% on average), titanium(TiO_21. 58% on average) and LREEs, thus belonging to peraluminous series. In addition, samples fall in shoshonite and calcium alkaline area in SiO_2-K_2O diagram. Mineral fractional crystallization occurred during the evolution of magma. εHf(t) values of alkali gabbro are-4. 7 ~-11. 5. It is inferred that alkali gabbros in TK01 were derived from enriched mantle with less contamination by continental material, and that the magma formed in the tectonic setting of continental intraplate extension.
LA-MC-ICP MS zircon U-Pb dating yielded the age of 63. 54 ± 0. 53 Ma for alkali gabbro from science deep drilling TK01 in Dingqiao, southern Tongling ore district. The age of alkali gabbro indicates intrusive magma activity in Cenozoic period. Major and trace elements suggest these igneous rocks in TK01 are characterized by high content of potassium(K_2O 1. 75% on average), rich alkali(K_2O + Na_2O 3. 90% on average), titanium(TiO_21. 58% on average) and LREEs, thus belonging to peraluminous series. In addition, samples fall in shoshonite and calcium alkaline area in SiO_2-K_2O diagram. Mineral fractional crystallization occurred during the evolution of magma. εHf(t) values of alkali gabbro are-4. 7 ~-11. 5. It is inferred that alkali gabbros in TK01 were derived from enriched mantle with less contamination by continental material, and that the magma formed in the tectonic setting of continental intraplate extension.
引文
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Hou Kejun,Li Yanhe,Zou Tianren,et al.2007.Laser ablation-MC-ICP-MS technique for Hf isotope microanalysis of zircon and its geological applications[J].Acta Petrologica Sinica,23(10):2 595~2 604(in Chinese with English abstract).
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Liu Hong,Qiu Jiansheng,Luo Qinghua,et al.2002.Petrogenesis of the Mesozoic potash-rich volcanic rocks in the Luzong basin,Anhui Province:Geochemical constraints[J].Geochimica,31(2):129~140(in Chinese with English abstract).
Liu Yongsheng,Hu Zhaochu,Zong Keqing,et al.2010.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J].Chinese Science Bulletin,55(15):1 535~1 546.
Ma Xingyuan and He Guoqi.1989.Precambrian crustal evolution of eastern Asia[J].Journal of Southeast Asian Earth Sciences,3(1~4):9~15.
Morel M L A,Nebel O,Nebel-Jacobsen Y J,et al.2006.Hafnium isotope characterization of the GJ-1 zircon reference material by solution and laser-ablation MC-ICPMS[J].Chemical Geology,255:231~235.
Nasdala L,Hofmeister W,Norberg N,et al.2008.Zircon M257-Ahomogeneous natural reference material for the ion microprobe U-Pb analysis of zircon[J].Geostandards and Geoanalytical Research,32:247~265.
Peng Touping,Wang Yuejun,Fan Weiming,et al.2006.39Ar/40Ar geochronology and geochemistry of the early Tertiary basaltic rocks in the Jianghan Basin,China andits petrogenesis[J].Acta Petrologica Sinica,22(6):1 617~1 626(in Chinese with English abstract).
Peng Zicheng,Zartman R E,Futa K,et al.1986.Pb-,Sr-and Nd-isotopic systematics,chemical characteristics of Cenozoic basalts,eastern China[J].Chem.Geol.,59:3~33.
Plank T and Langmuir C H.1998.The chemical composition of subducting sediment and its consequences for the crust and mantle[J].Chem.Geol.,145:325~394.
Qin Yongjun,Zeng Jiannian,Zeng Yong,et al.2010.Zircon LA-ICP-MS U-Pb dating of ore-bearing pyroxene-trachyandesite porphyry and its geological significance in Luohe-Nihe iron ore field in Luzong basin,southern Anhui,China[J].Geological Bulletin of China,29(6):851~862(in Chinese with English abstract).
Rundnick R L and David M F.1995.Nature and composition of the continental crust:A lower crustal perspective[J].Reviews of Geophysics,33(3):267~309.
Sun S S and Mc Donough W F.1989.Chemical and isotopic systematics of oceanic basalts:Implications for mantle composition and processes(in magmatism in the ocean basins)[J].Geol.Soc.Spec.Publ.,42:313~345.
Taylor S R and Mc Lenann S M.1985.The Continental Crust:Its Compo sition and Evolution[M].Blackwell,Oxford Press,312.
Wang Hongzhen and Mo Xuanxue.1995.An outline of the tectonic evolution of China[J].Episodes,18(1~2):6~16.
Wang Qianfei,Deng Jun,Huang Dinghua,et al.2011.Deformation model for the Tongling ore cluster region,east-central China[J].International Geology Review,53(5~6):562~579.
Wu Fuyuan,Li Xianhua,Zheng Yongfei,et al.2007.Lu-Hf isotopic systematic and their applications in petrology[J].Acta Petrologica Sinica,23(2):185~220(in Chinese with English abstract).
Xie Jiancheng,Yang Xiaoyong,Du Jianguo,et al.2008.Zircon U-Pb geochronology of the Mesozoic intrusive rocks in the Tongling region:Implications for copper-gold mineralization[J].Acta Petrologica Sinica,24(8):1 782~1 800(in Chinese with English abstract).
Yuan Feng,Zhou Taofa,Fan Yu,et al.2010.LA-ICPMS U-Pb ages of zircons from Mesozoic volcanic rocks and their significance in Fanchang basin.Anhui Province,China[J].Acta Petrologica Sinica,26(9):2 805~2 817(in Chinese with English abstract).
Zhao Zhenhua and Zhou Lingdi.1994.Some of China's rich base of rare earth elements geochemistry intrusive rocks[J].Sci.China(B),24(10):1 109~1 120(in Chinese with English abstract).
Zhu Qingbo,Yang Kunguang and Cheng Wanqiang.2011.Structural evolution of northern Jiangnan up lift evidence from ESR Dating[J].Geoscience,25(1):31~38(in Chinese with English abstract).
Zou Haibo,Zindler A,Xu Xisheng,et al.2000.Major,trace element,and Nd,Sr and Pb isotope studies of Cenozoic basalts in SE China:mantle sources,regional variations,and tectonic significance[J].Chem.Geol.,171:33~47.
白文吉,胡旭峰,周美付.1992.胶东-苏比石榴石二辉橄榄岩形成条件及年代[J].岩石矿物学杂志,11(4):299~305.
柴凤梅,帕拉提·阿布都卡迪尔,张招崇,等.2007.塔里木板块西南缘钾质煌斑岩地球化学及源区特征[J].地质论评,53(1):11~21.
陈道公,彭子成.1988.苏皖若干新生代火山岩的钾氩年龄和铅锶同位素组成[J].岩石学报,5(2):3~12.
陈烈祖,夏广胜.1981.安徽沿江地区早第三纪地层[J].地层学杂志,5(3):157~164.
从伯林,王清晨,张海政,等.1996.中国合肥盆地新生代火山岩成因岩石学研究[J].岩石学报,12(3):370~381.
从柏林,张儒媛,李曙光,等.1990.中国苏北-胶东南高压变质带的同位素地质年代初探[J].岩石圈构造演化开放实验室年报,73~76.
鄂莫岚,赵大升.1987.中国东部新生代玄武岩及深源岩石包体[M].北京:科学出版社.
范裕,周涛发,袁峰,等.2008.安徽庐江-枞阳地区A型花岗岩的LA-ICP-MS定年及其地质意义[J].岩石学报,24(8):1 715~1 724.
侯可军,李延河,田有荣.2009.LA-MC-ICP-MS锆石微区原位U-Pb定年技术[J].矿床地质,28(4):481~492.
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