栖霞牙山花岗岩及其暗色包体地球化学特征及成因研究
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摘要
栖霞牙山花岗岩体形成于中生代早白垩世(118 Ma),其岩石类型以花岗岩和花岗闪长岩为主,岩体中发育大量的暗色闪长质微粒包体。通过对牙山花岗岩及其暗色包体地球化学特征研究表明,包体围岩w(SiO_2)=65.5%～68.82%,铝饱和度(A/CNK)为0.89～1.03<1.1,为准铝质钙碱性Ⅰ型花岗岩;暗色包体具有较低w(SiO_2)值(54.82%～60.89%)、高w(TFe_2O_3)值(6.11%～8.15%)、高w(MgO)值(3.57%～5.19%)的特征。稀土元素配分模式图显示二者皆为轻稀土富集的右倾型曲线,微量元素蛛网图中二者均表现为富集Ba、K等大离子亲石元素,亏损Ta、Nb、Ti等高场强元素,具有大陆地壳的特征。暗色包体与寄主岩石的Sr同位素初始比值(87 Sr/86 Sr)i分别为0.709 29～0.709 58和0.709 21～0.709 71,应为同源岩浆的产物。两阶段Nd模式年龄(T2DM)分为2 291Ma—2 391Ma和2 208Ma—2 353Ma,表明可能是古元古界陆壳物质部分熔融的产物。Pb同位素特征显示牙山岩体的原始岩浆以下地壳为主,w(Nb)/w(Ta)值介于下地壳与原始地幔之间,表明可能受到幔源物质的影响,包体中大量磷灰石呈针状结晶状态,进一步暗示存在岩浆混合作用。综上并结合区域构造背景认为,牙山岩体为早白垩世中晚期起源于火山弧环境的壳源特征花岗岩,形成过程中存在幔源物质的加入,它的形成与太平洋板块的俯冲作用密切相关。
Yashan granitic body is formed in Mesozoic Early Cretaceous Epoch(118 Ma)and composed mainly of granite and granodiorite.Dioritic melan enclusions are well developed in the granitic body.w(SiO_2)=65.5%to 68.82%,A/CNK=0.89 to 1.03<1.1 of host rock of the enclusions show that they are calc-mantle metaluminous I-type granite.The melan enclusion is characterized by lower SiO_2(54.82%to 60.89%),and higher TFe_2O_3(6.11%to 8.15%)and MgO(3.57%to 5.19%).REE pattern of the enclusion snd host show LREE enrichment and their trace element spider diagrams show large lithophile ion element(Ba,K)enrichment and high field strenth element(Ta,Nb,Ti)depletion which is charateristic of continental crust.The enclusion and host rock have initial~(87) Sr/~(86) Sr ratios of 0.709 21 to 0.709 71 and 0.709 29 to 0.709 58 suggesting that hey are of the same source.The two stage Rb model age(T_(2 DM))is respectively 2 291 Ma—2 391 Ma and 2 208 Ma—2 353 Ma suggesting that they are the product of partial melting of the crustal materials.Pb isotope characteristics show dominance of lower crustal material of primitive magma of Yashan granite body.The value of w(Nb)/w(Ta)is between those of crust and primitive mantle that is the indication of influence of primitive mantle.The needle-like apatite crystal in the enclusion implies the magma mingle.Therefore,Yashan rock body is a crust-derived granite closely related to subduction of the Pacific ocean plate and incorporated with mantle materials and formed under volcanic arc environment in middle-late Early Cretaceous Epoch.
Yashan granitic body is formed in Mesozoic Early Cretaceous Epoch(118 Ma)and composed mainly of granite and granodiorite.Dioritic melan enclusions are well developed in the granitic body.w(SiO_2)=65.5%to 68.82%,A/CNK=0.89 to 1.03<1.1 of host rock of the enclusions show that they are calc-mantle metaluminous I-type granite.The melan enclusion is characterized by lower SiO_2(54.82%to 60.89%),and higher TFe_2O_3(6.11%to 8.15%)and MgO(3.57%to 5.19%).REE pattern of the enclusion snd host show LREE enrichment and their trace element spider diagrams show large lithophile ion element(Ba,K)enrichment and high field strenth element(Ta,Nb,Ti)depletion which is charateristic of continental crust.The enclusion and host rock have initial~(87) Sr/~(86) Sr ratios of 0.709 21 to 0.709 71 and 0.709 29 to 0.709 58 suggesting that hey are of the same source.The two stage Rb model age(T_(2 DM))is respectively 2 291 Ma—2 391 Ma and 2 208 Ma—2 353 Ma suggesting that they are the product of partial melting of the crustal materials.Pb isotope characteristics show dominance of lower crustal material of primitive magma of Yashan granite body.The value of w(Nb)/w(Ta)is between those of crust and primitive mantle that is the indication of influence of primitive mantle.The needle-like apatite crystal in the enclusion implies the magma mingle.Therefore,Yashan rock body is a crust-derived granite closely related to subduction of the Pacific ocean plate and incorporated with mantle materials and formed under volcanic arc environment in middle-late Early Cretaceous Epoch.
引文
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[9]关义立，袁超，龙晓平，等．华南早古生代花岗岩中暗色包体的成因：岩石学、地球化学和锆石年代学证据[J]．大地构造与成矿学，2016,40(1):109-124．
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[12]张岳桥，董树文．郯庐断裂带中生代构造演化史：进展与新认识[J]．地质通报，2008,27(9):1371-1390．
[13]葛君，张泽坤，倪金龙，等．牟平-即墨断裂带南端断裂构造特征及动力学成因[J]．现代地质，2015,29(4):747-754．
[14]汤立成．山东东部花岗岩特征和成因的几点认识[J]．山东地质，1989(1):55-62．
[15]张岳桥，李金良，张田，等．胶东半岛牟平-即墨断裂带晚中生代运动学转换历史[J]．地质论评，2007(3):289-300．
[16]曲晓明，王鹤年，饶冰．郭家岭花岗闪长岩岩体中闪长质包体的成因研究[J]．矿物学报，1997,17(3):302-309．
[17]邱连贵，任凤楼，曹忠祥，等．胶东地区晚中生代岩浆活动对大地构造的制约[J]．大地构造与成矿学，2008,32(1):117-123．
[18]苗来成，罗镇宽，关康，等．玲珑花岗岩中锆石的离子质谱U-Pb年龄及其岩石学意义[J]．岩石学报，1998,14(2):198-206．
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[22]朱保霖，柳振江，成少博，等．胶东院格庄岩体中辉钼矿ReOs同位素测年及其地质意义[J]．中国地质，2016,43(4):1353-1366．
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[30]李增达，于晓飞，王全明，等．胶东三佛山花岗岩的成因：成岩物理化学条件、锆石U-Pb年代学及Sr-Nd同位素约束[J]．岩石学报．2018,34(2):447-468．
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[32]王中亮，赵荣新，张庆，等．胶西北高Ba-Sr郭家岭型花岗岩岩浆混合成因：岩石地球化学与Sr-Nd同位素约束[J]．岩石学报，2014,30(9):2595-2608．
[33]牛漫兰，赵齐齐，吴齐，等．柴北缘果可山岩体的岩浆混合作用：来自岩相学、矿物学和地球化学证据[J]．岩石学报，2018,34(7):1991-2016．
[34]王梁，王根厚，雷时斌，等．岩浆混合成因暗色微粒包体的识别标志[C]∥中国矿物岩石地球化学学会学术年会．2013．
[35]Didier J,Barbarin B.Enclaves and granite petrology[M].Amsterdam:Elsevier:1991:1-625．
[36]迟效国，戚长谋．中国东部花岗岩荷载微粒闪长质包体成因[J]．长春地质学院学报，1995(2):131-137．
[37]Wyllie P J,Cox K G,Biggar G M.The Habit of Apatite in Synthetic Systems and Igneous Rocks[J].Journal of Petrology,1962,3(2):238-243．
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