鲁西徂徕山南部花岗闪长斑岩锆石LA-ICP-MS U-Pb定年及其地质意义
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摘要
出露于鲁西徂徕山南部的花岗闪长斑岩是鲁西中生代岩浆活动的重要记录,在野外地质工作的基础上,通过对其进行锆石LA-ICP-MS U-Pb同位素年代学研究,得到了花岗闪长斑岩的形成时代,并对鲁西地区中生代的岩浆活动进行了讨论。研究得到,谐和度>90%的锆石中存在~2.5Ga的继承性岩浆锆石和125~130Ma的岩浆锆石。经分析,得到其加权平均年龄为(127.3±1.2)Ma(MSWD=1.3),认为这一年龄代表了花岗闪长斑岩的形成年龄,而~2.5Ga的继承性岩浆锆石的存在说明了花岗闪长斑岩的源区可能来自于华北古老基底或在岩浆侵位过程中遭受了古老基底的混染作用。
Granodiorite-porphyry in Culaishan of Western Shandong is one of the most important record of Mesozoic magmatism.On the basis of lithology,the forming age of granodiorite-porphyry have been gained,and Mesozoic magmatism in western Shandong has been discussed.It is found that there are inherited magma with the age of~2.5 Ga and magmatic zircon with the age of 125~130 Ma in the zircon with the consonant degree is over than 90%.The weighted average age is(127.3 + 1.2)Ma(MSWD=1.3).It is regarded that this age represents the formation age of granodiorite porphyry,and the existence of the inherited magmatic zircon of~2.5 Ga indicates that the source area of the granite diorite may come from the ancient base of Northern China or experience the contamination in the process of magma emplacement.
Granodiorite-porphyry in Culaishan of Western Shandong is one of the most important record of Mesozoic magmatism.On the basis of lithology,the forming age of granodiorite-porphyry have been gained,and Mesozoic magmatism in western Shandong has been discussed.It is found that there are inherited magma with the age of~2.5 Ga and magmatic zircon with the age of 125~130 Ma in the zircon with the consonant degree is over than 90%.The weighted average age is(127.3 + 1.2)Ma(MSWD=1.3).It is regarded that this age represents the formation age of granodiorite porphyry,and the existence of the inherited magmatic zircon of~2.5 Ga indicates that the source area of the granite diorite may come from the ancient base of Northern China or experience the contamination in the process of magma emplacement.
引文
[1]王世进,张成基,杨恩秀,等.鲁西地区中生代侵入岩期次划分[J].山东国土资源,2009,25(2):19-24.
[2]张增奇,张成基,王世进,等.山东省地层侵入岩构造单元划分对比意见[J].山东国土资源,2014,30(3):1-23.
[3]王世进,张成基,吕明英.鲁西地区中生代沂南超单元基本特征[J].山东地质,1998,14(4):4-15.
[4]田京祥,李秀章,宋志勇,等.鲁西中生代金矿形成时代、物质来源及问题讨论[J].地质学报,2015,89(8):1530-1537.
[5]Xi-YaoLi,San-ZhongLi,Yan-HuiSuo,et al.Early Cretaceous diabases,lamprophyres and andesites-dacites in western Shandong,North China Craton:Implications for local delamination and Paleo-Pacific slab rollback[J].Journal of Asian Earth Sciences,2018,160:426-444.
[6]张剑,李三忠,李玺瑶,等.鲁西地区燕山期构造变形:古太平洋板块俯冲的构造响应[J].地学前缘,2017,24(4):226-238.
[7]靳立杰,赵体群,高继雷,等.鲁西徂徕山地区傲来山序列二长花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].山东国土资源,2017,33(12):1-5.
[8]Liu Y,Gao S,Hu Z,et al.Continental and oceanic crust recycling-induced melt–peridotite interactions in the TransNorth China Orogen:U–Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology.2010,51(1-2):537-571.
[9]Liu Y,Hu Z,Gao S,et al.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology.2008,257(1):34-43.
[10]Andersen T.Correction of common lead in U-Pb analyses that do not report 204 Pb[J].Chemical geology.2002,192(1):59-79.
[11]Ludwig K R.User's manual for Isoplot 3.00:ageochronological toolkit for Microsoft Excel[M].Kenneth R.Ludwig,2003:5-21.
[12]山东省地质矿产勘查开发局.山东省区域调查地质图(泰安幅)[M].济南:山东省地图出版社,1997:1-34.
[13]徐义刚,巫祥阳,罗震宇,等.山东中侏罗世-早白垩世侵入岩的锆石Hf同位素组成及其意义[J].岩石学报,2007(2):307-316.
[14]杨承海,许文良,杨德彬,等.鲁西中生代高Mg闪长岩的成因:年代学与岩石地球化学证据[J].地球科学,2006(1):81-92.
[15]许文良,王清海,王冬艳,等.华北克拉通东部中生代岩石圈减薄的过程与机制:中生代火成岩和深源捕虏体证据[J].地学前缘,2004(3):309-317.
[16]裴福萍,许文良,王清海,等.鲁西费县中生代玄武岩及幔源捕掳晶的矿物化学:对岩石圈地幔性质的制约[J].高校地质学报,2004(1):88-97.
[17]杨承海.鲁西中生代高镁闪长岩的年代学与地球化学:对华北克拉通岩石圈演化的制约[D].长春:吉林大学,2007:1-24.
[2]张增奇,张成基,王世进,等.山东省地层侵入岩构造单元划分对比意见[J].山东国土资源,2014,30(3):1-23.
[3]王世进,张成基,吕明英.鲁西地区中生代沂南超单元基本特征[J].山东地质,1998,14(4):4-15.
[4]田京祥,李秀章,宋志勇,等.鲁西中生代金矿形成时代、物质来源及问题讨论[J].地质学报,2015,89(8):1530-1537.
[5]Xi-YaoLi,San-ZhongLi,Yan-HuiSuo,et al.Early Cretaceous diabases,lamprophyres and andesites-dacites in western Shandong,North China Craton:Implications for local delamination and Paleo-Pacific slab rollback[J].Journal of Asian Earth Sciences,2018,160:426-444.
[6]张剑,李三忠,李玺瑶,等.鲁西地区燕山期构造变形:古太平洋板块俯冲的构造响应[J].地学前缘,2017,24(4):226-238.
[7]靳立杰,赵体群,高继雷,等.鲁西徂徕山地区傲来山序列二长花岗岩锆石LA-ICP-MS U-Pb定年及其地质意义[J].山东国土资源,2017,33(12):1-5.
[8]Liu Y,Gao S,Hu Z,et al.Continental and oceanic crust recycling-induced melt–peridotite interactions in the TransNorth China Orogen:U–Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology.2010,51(1-2):537-571.
[9]Liu Y,Hu Z,Gao S,et al.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology.2008,257(1):34-43.
[10]Andersen T.Correction of common lead in U-Pb analyses that do not report 204 Pb[J].Chemical geology.2002,192(1):59-79.
[11]Ludwig K R.User's manual for Isoplot 3.00:ageochronological toolkit for Microsoft Excel[M].Kenneth R.Ludwig,2003:5-21.
[12]山东省地质矿产勘查开发局.山东省区域调查地质图(泰安幅)[M].济南:山东省地图出版社,1997:1-34.
[13]徐义刚,巫祥阳,罗震宇,等.山东中侏罗世-早白垩世侵入岩的锆石Hf同位素组成及其意义[J].岩石学报,2007(2):307-316.
[14]杨承海,许文良,杨德彬,等.鲁西中生代高Mg闪长岩的成因:年代学与岩石地球化学证据[J].地球科学,2006(1):81-92.
[15]许文良,王清海,王冬艳,等.华北克拉通东部中生代岩石圈减薄的过程与机制:中生代火成岩和深源捕虏体证据[J].地学前缘,2004(3):309-317.
[16]裴福萍,许文良,王清海,等.鲁西费县中生代玄武岩及幔源捕掳晶的矿物化学:对岩石圈地幔性质的制约[J].高校地质学报,2004(1):88-97.
[17]杨承海.鲁西中生代高镁闪长岩的年代学与地球化学:对华北克拉通岩石圈演化的制约[D].长春:吉林大学,2007:1-24.