青岛胶南隆起带小珠山早白垩世花岗岩锆石U-Pb年代学及胶东半岛中生代花岗岩成因初探
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摘要
青岛胶南隆起带小珠山花岗岩SiO_2平均含量70.21%,A/CNK平均1.13,为强过铝质酸性岩体。岩体具有高钾特征,显示中等程度的LREE富集、中等负Eu异常,Yb平均含量1.23×10~(-6)μg/g,Y平均含量0.18×10~(-6)μg/g,Sr平均含量21.93×10~(-6)μg/g,为低Sr低Yb的喜马拉雅型花岗岩。锆石LA-ICP-MS U-Pb年龄加权平均结果为123 Ma和122 Ma,是早白垩世燕山晚期的产物。胶东半岛中生代花岗岩形成于3个时期并具有不同的形成机制:晚三叠世(225～205 Ma)幔源型花岗岩,是扬子板块向华北板块俯冲碰撞形成苏鲁超高压变质带,地幔物质沿裂隙上涌,富集地幔产生轻度熔融的结果;晚侏罗世—早白垩世(160～135 Ma)地壳重熔型花岗岩,源岩形成于700～800 Ma的扬子陆块,由经历了三叠世超高压变质作用的扬子陆壳的新元古代物质熔融形成;早白垩世(130～105 Ma)花岗岩形成于俯冲加厚深度不同的大陆地壳。胶北隆起区域的高Mg高Sr低Yb的埃达克型花岗岩形成深度较深(30～40 km),可能由镁铁质下地壳的熔融分异形成;胶南隆起区域的低Mg低Sr低Yb的喜马拉雅型花岗岩形成环境相对较浅(<30 km),源岩可能来自含石榴石和斜长石的高压麻粒岩相的大陆地壳。
With the content of SiO_2 of 70.21% and the average A/CNK of 1.13, Xiaozhushan granite in Qingdao Jiaonan uplift is strongly peraluminous acid rock. With high-K characteristics, moderate LREE enrichment, moderate negative Eu anomaly, the average Yb content of 1.23×10~(-6) μg/g, the average Y content of 0.18×10~(-6) μg/g, and the average Sr content of 21.93×10~(-6) μg/g, the rock belongs to the Himalaya type with low Sr and Yb. The geochemistry LA-ICP-MS zircon U-Pb dating shows that the Xiaozhushan granite formed in the Early Cretaceous Epoch(aged 122 Ma and 123 Ma). The Mesozoic granite of Jiaodong Peninsula formed during three different periods with different formation mechanisms. The Late Triassic(225-205 Ma) mantle-derived granites formed as a result of the mild fusion of mantle substance upswelling along the fracture of the Sulu ultrahigh-pressure metamorphic belt when Yangtze Plate and North China Plate collided with each other. The Late Jurassic-Early Cretaceous(160-135 Ma) heavy fusion crustal granites, whose source rock is the Yangtze Plate aged 700-800 Ma, formed as a result of fusion Neoproterozoic substance of the Yangtze Plate crust after experiencing Triassic ultrahigh-pressure metamorphism. The Early Cretaceous(130-105 Ma) granites formed in crust with different intensified diving depth. The Adak granite with high Mg, high Sr and low Yb content in Jiaobei uplift area formed in greater depth(30-40 km), possibly as a result of the lower crust of the mafic iron. The Himalayan granite with low Mg, low Sr and low Yb content in the Jiaonan uplift area formed in a relatively shallower environment(<30 km) and its source rock might be the crust of high-pressure granulite facies with the content of garnet and anorthose.
With the content of SiO_2 of 70.21% and the average A/CNK of 1.13, Xiaozhushan granite in Qingdao Jiaonan uplift is strongly peraluminous acid rock. With high-K characteristics, moderate LREE enrichment, moderate negative Eu anomaly, the average Yb content of 1.23×10~(-6) μg/g, the average Y content of 0.18×10~(-6) μg/g, and the average Sr content of 21.93×10~(-6) μg/g, the rock belongs to the Himalaya type with low Sr and Yb. The geochemistry LA-ICP-MS zircon U-Pb dating shows that the Xiaozhushan granite formed in the Early Cretaceous Epoch(aged 122 Ma and 123 Ma). The Mesozoic granite of Jiaodong Peninsula formed during three different periods with different formation mechanisms. The Late Triassic(225-205 Ma) mantle-derived granites formed as a result of the mild fusion of mantle substance upswelling along the fracture of the Sulu ultrahigh-pressure metamorphic belt when Yangtze Plate and North China Plate collided with each other. The Late Jurassic-Early Cretaceous(160-135 Ma) heavy fusion crustal granites, whose source rock is the Yangtze Plate aged 700-800 Ma, formed as a result of fusion Neoproterozoic substance of the Yangtze Plate crust after experiencing Triassic ultrahigh-pressure metamorphism. The Early Cretaceous(130-105 Ma) granites formed in crust with different intensified diving depth. The Adak granite with high Mg, high Sr and low Yb content in Jiaobei uplift area formed in greater depth(30-40 km), possibly as a result of the lower crust of the mafic iron. The Himalayan granite with low Mg, low Sr and low Yb content in the Jiaonan uplift area formed in a relatively shallower environment(<30 km) and its source rock might be the crust of high-pressure granulite facies with the content of garnet and anorthose.
引文
[1]丁汝鑫,周祖翼.大别-苏鲁造山带、华南晚中生代花岗岩时空分布及应力场对比[J].地学前缘,2011,18(1):9-14.DING Ruxin,ZHOU Zuyi.A comparison between the Late Mesozoic Dabie-Sulu orogenic belt and South China in terms of their granite spatial-temporal distributions and stress fields[J].Earth Science Frontiers,2011,18(1):9-14.
[2]郭敬辉,陈福坤,张小曼,等.苏鲁超高压带北部中生代岩浆侵入活动与同碰撞-碰撞后构造过程:锆石U-Pb年代学[J].岩石学报,2005,21(4):1281-1301.GUO Jinghui,CHEN Fukun,ZHANG Xiaoman,et al.Evolution of syn-to post-collisional magmatism from north Sulu UHP belt,eastern China:Zircon U-Pb geochronology[J].Acta Petrologica Sinica,2005,21(4):1281-1301.
[3]周建波,郑永飞,赵子福.山东五莲中生代岩浆岩的锆石U-Pb 年龄[J].高校地质学报,2003,9(2):185-194.ZHOU Jianbo,ZHENG Yongfei,ZHAO Zifu.Zircon U-Pb dating on Mesozoic granitoids at Wulian,Shandong province[J].Geological Journal of China Universities,2003,9(2):185-194.
[4]YUAN H,GAO S,LIU X,et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma-mass spectrometry[J].Geostandards & Geoanalytical Research,2010,28(3):353-370.
[5]BOYNTON W V.Geochemistry of the rare earth element:Meteorite studies[M].New York:Elsevier Science Publishers,1984:63-114.
[6]MCDONOUGH W F,SUN S,RINGWIND A F,et al.Potassium,rubidium,and cesium in the earth and moon and the evolution of the mantle of the earth[J].Geochimica et Cosmochimica Acta,1991,56(3):1001-1012.
[7]WEABER B L.The origin of ocean island basalt endember compositions:Trace element and isotopic constraints[J].Earth and Planetary Science Letters,1991,104(2):381-397.
[8] 张旗,金惟俊,李承东,等.花岗岩与地壳厚度关系探讨[J].大地构造与成矿学,2011,35(2):259-269ZHANG Qi,JIN Weijun,LI Chengdong,et al.Granitic rock sand their formation depth in the crust[J].Geotectonica et Metallogenia,2011,35(2):259-269.
[9]CHEN J F,XIE Z,LI H M,et al.U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane,China[J].Geochemical Journal,2008,37(1):35-46.
[10]YANG J H,CHUNG S L,WILDE S A,et al.Petrogenesis of post-orogenic syenites in the sulu Orogenic Belt,East China:Geochemical and Nd-Sr isotopic evidence[J].Chenical Geology,2005,214:99-215.
[11]张娟.苏鲁造山带中生代岩浆岩地球化学研究[D].合肥:中国科学技术大学,2011.
[12]张田,张岳桥.胶东半岛中生代侵入岩浆活动序列及其构造制约[J].高校地质学报,2007,13(2):323-336.ZHANG Tian,ZHANG Yueqiao.Geochronological sequence of Mesozoic intrusive magmatism in Jiaodong peninsula and its tectonic constraints [J].Geological Journal of China Universities,2007,13(2):323-336.
[13]张华锋,翟明国,何中甫,等.胶东昆嵛山杂岩中高锶花岗岩地球化学成因及其意义[J].岩石学报,2004,20(3):369-380.ZHANG Huafeng,ZHAI Mengguo,HE Zhongfu,et al.Petrogenesis and implications of the sodium-rich granites from the Kunyushan complex,Eastern Shandong province[J].Acta petrologica Sinica,2004,20(3):369-380.
[14]杨海斌,田小波,白志明,等.浅谈中国大陆东缘中生代地质演化与泛太平洋板块活动的关系[J].吉林大学学报,2016,46(3):781-797.YANG Haibin,TIAN Xiaobo,BAI Zhiming,et al.Discussion on the relationship between Pan Pacific Plate movement and Mesozoic geological evolution of Eastern Chinese continent[J].Journal of Jilin University,2016,46(3):781-797.
[15]GAO J D,FENG Q,ZHANG X L,et al.Zircon U-Pb geochronology of crystal tuff on Lingshan island and its geological implications for magmatism,stratigraphic age and geological events[J].Nature,2018,8:1-9.
[16]RAPP R P,WASTON E B.Dehydration melting of meta basalt at 8-32 kbar:Implications for continental growth and crust mantle recycling[J].Petrol,1995,36:891-931.
[17]PAUL A M.Slab melting as an explanation of Quaternary volcanism and a seismicity in southwest Japan [J].Geology,1995,23(5):395-398.
[18]陈斌,田伟,翟明国,等.太行山和华北其它地区中生代岩浆作用的锆石U-Pb年代学和地球化学特征及其岩浆成因和地球动力学意义[J].岩石学报,2005,21(1):13-24.CHEN Bing,TIAN Wei,ZHAI Mengguo,et al.Zircon U-Pb geochronology and geochemistry of the Mesozoic magmatism in the Taihang Mountains and other places of the North China craton[J].Acta Petrologica Sinica,2005,21(1):13-24.
[19]刘红涛,孙世华,刘建明,等.华北克拉通北缘中生代高锶花岗岩类:地球化学与源区性质[J].岩石学报,2002,18(3):257-274.LIU Hongtao,SUN Shihua,LIU Jianming,et al.The Mesozoic high-Sr granitoids in the northern marginal region of North China Craton:Geochemistry and source region[J].Acta Petrologica Sinica,2002,18(3):257-274.
[20]罗贤冬,杨晓勇,段留安,等.胶北地块与金成矿有关的郭家岭岩体和上庄岩体年代学及地球化学研究[J].地质学报,2014,88(10):1874-1888.LUO Xiandong,YANG Xiaoyong,DUAN Liuan,et al.Geochemical and geochronological study of the cold-related Guojiangling pluton and Shangzhuang pluton in Jiaodong block[J].Acta Geologica Sinica,2014,88(10):1874-1888.
[21]QIAN Q,HERMANN J.Partial melting of lower crust at 10-15 kbar:Constraints on Adakite and TTG formation [J].Contributions to Mineralogy and Petrology,2013,165:1195-1224.
[2]郭敬辉,陈福坤,张小曼,等.苏鲁超高压带北部中生代岩浆侵入活动与同碰撞-碰撞后构造过程:锆石U-Pb年代学[J].岩石学报,2005,21(4):1281-1301.GUO Jinghui,CHEN Fukun,ZHANG Xiaoman,et al.Evolution of syn-to post-collisional magmatism from north Sulu UHP belt,eastern China:Zircon U-Pb geochronology[J].Acta Petrologica Sinica,2005,21(4):1281-1301.
[3]周建波,郑永飞,赵子福.山东五莲中生代岩浆岩的锆石U-Pb 年龄[J].高校地质学报,2003,9(2):185-194.ZHOU Jianbo,ZHENG Yongfei,ZHAO Zifu.Zircon U-Pb dating on Mesozoic granitoids at Wulian,Shandong province[J].Geological Journal of China Universities,2003,9(2):185-194.
[4]YUAN H,GAO S,LIU X,et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation-inductively coupled plasma-mass spectrometry[J].Geostandards & Geoanalytical Research,2010,28(3):353-370.
[5]BOYNTON W V.Geochemistry of the rare earth element:Meteorite studies[M].New York:Elsevier Science Publishers,1984:63-114.
[6]MCDONOUGH W F,SUN S,RINGWIND A F,et al.Potassium,rubidium,and cesium in the earth and moon and the evolution of the mantle of the earth[J].Geochimica et Cosmochimica Acta,1991,56(3):1001-1012.
[7]WEABER B L.The origin of ocean island basalt endember compositions:Trace element and isotopic constraints[J].Earth and Planetary Science Letters,1991,104(2):381-397.
[8] 张旗,金惟俊,李承东,等.花岗岩与地壳厚度关系探讨[J].大地构造与成矿学,2011,35(2):259-269ZHANG Qi,JIN Weijun,LI Chengdong,et al.Granitic rock sand their formation depth in the crust[J].Geotectonica et Metallogenia,2011,35(2):259-269.
[9]CHEN J F,XIE Z,LI H M,et al.U-Pb zircon ages for a collision-related K-rich complex at Shidao in the Sulu ultrahigh pressure terrane,China[J].Geochemical Journal,2008,37(1):35-46.
[10]YANG J H,CHUNG S L,WILDE S A,et al.Petrogenesis of post-orogenic syenites in the sulu Orogenic Belt,East China:Geochemical and Nd-Sr isotopic evidence[J].Chenical Geology,2005,214:99-215.
[11]张娟.苏鲁造山带中生代岩浆岩地球化学研究[D].合肥:中国科学技术大学,2011.
[12]张田,张岳桥.胶东半岛中生代侵入岩浆活动序列及其构造制约[J].高校地质学报,2007,13(2):323-336.ZHANG Tian,ZHANG Yueqiao.Geochronological sequence of Mesozoic intrusive magmatism in Jiaodong peninsula and its tectonic constraints [J].Geological Journal of China Universities,2007,13(2):323-336.
[13]张华锋,翟明国,何中甫,等.胶东昆嵛山杂岩中高锶花岗岩地球化学成因及其意义[J].岩石学报,2004,20(3):369-380.ZHANG Huafeng,ZHAI Mengguo,HE Zhongfu,et al.Petrogenesis and implications of the sodium-rich granites from the Kunyushan complex,Eastern Shandong province[J].Acta petrologica Sinica,2004,20(3):369-380.
[14]杨海斌,田小波,白志明,等.浅谈中国大陆东缘中生代地质演化与泛太平洋板块活动的关系[J].吉林大学学报,2016,46(3):781-797.YANG Haibin,TIAN Xiaobo,BAI Zhiming,et al.Discussion on the relationship between Pan Pacific Plate movement and Mesozoic geological evolution of Eastern Chinese continent[J].Journal of Jilin University,2016,46(3):781-797.
[15]GAO J D,FENG Q,ZHANG X L,et al.Zircon U-Pb geochronology of crystal tuff on Lingshan island and its geological implications for magmatism,stratigraphic age and geological events[J].Nature,2018,8:1-9.
[16]RAPP R P,WASTON E B.Dehydration melting of meta basalt at 8-32 kbar:Implications for continental growth and crust mantle recycling[J].Petrol,1995,36:891-931.
[17]PAUL A M.Slab melting as an explanation of Quaternary volcanism and a seismicity in southwest Japan [J].Geology,1995,23(5):395-398.
[18]陈斌,田伟,翟明国,等.太行山和华北其它地区中生代岩浆作用的锆石U-Pb年代学和地球化学特征及其岩浆成因和地球动力学意义[J].岩石学报,2005,21(1):13-24.CHEN Bing,TIAN Wei,ZHAI Mengguo,et al.Zircon U-Pb geochronology and geochemistry of the Mesozoic magmatism in the Taihang Mountains and other places of the North China craton[J].Acta Petrologica Sinica,2005,21(1):13-24.
[19]刘红涛,孙世华,刘建明,等.华北克拉通北缘中生代高锶花岗岩类:地球化学与源区性质[J].岩石学报,2002,18(3):257-274.LIU Hongtao,SUN Shihua,LIU Jianming,et al.The Mesozoic high-Sr granitoids in the northern marginal region of North China Craton:Geochemistry and source region[J].Acta Petrologica Sinica,2002,18(3):257-274.
[20]罗贤冬,杨晓勇,段留安,等.胶北地块与金成矿有关的郭家岭岩体和上庄岩体年代学及地球化学研究[J].地质学报,2014,88(10):1874-1888.LUO Xiandong,YANG Xiaoyong,DUAN Liuan,et al.Geochemical and geochronological study of the cold-related Guojiangling pluton and Shangzhuang pluton in Jiaodong block[J].Acta Geologica Sinica,2014,88(10):1874-1888.
[21]QIAN Q,HERMANN J.Partial melting of lower crust at 10-15 kbar:Constraints on Adakite and TTG formation [J].Contributions to Mineralogy and Petrology,2013,165:1195-1224.
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