西藏南木林县拉隆地区花岗闪长岩体的时代、岩石地球化学特征及构造背景
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摘要
冈底斯印支期构造-岩浆-成矿的研究比较缺乏.以出露在冈底斯隆格尔-念青唐古拉复合古岛弧带的拉隆花岗闪长岩体为研究对象,通过野外地质调查、岩石学、LA-ICP-MS锆石U-Pb定年、岩石地球化学和锆石Lu-Hf同位素等方面的研究,探讨了其岩石成因和形成的构造背景.结果显示,拉隆花岗闪长岩体的LA-ICP-MS锆石U-Pb年龄为223.5±3.9Ma～225.4±4.9Ma,形成于晚三叠世(T3),属印支晚期构造-岩浆活动的产物;花岗闪长岩体表现出低Ti(w(TiO_2)=0.46%～0.73%),富Si(w (SiO_2)=63.24%～67.94%)、Al(w (Al_2O_3)=14.14%～15.85%)、Na(w (Na_2O)=2.58%～3.04%)、K(w(K_2O)=3.06%～4.89%),高钾钙碱性-钾玄岩系列和弱过铝质的主量元素地球化学特征;岩体稀土总量REE为138.62×10~(-6)～255.53×10~(-6),配分模式为轻稀土元素富集的右倾斜型,其(La/Yb)_N值为8.35～17.90,具明显的负Eu异常(Eu/Eu*=0.54～0.69),无Ce异常(Ce/Ce*=0.92～1.02);微量元素表现出Ba、Nb、Ta、Sr、Ti、P元素亏损和Rb、K、Th、U、Zr、Hf元素富集的特征.岩体的ε_(Hf)(t)为-6.4～2.5,其两阶段模式年龄tDM2为980～1 479Ma,相当于念青唐古拉群形成的地质时代.拉隆花岗闪长岩体属A型花岗岩,为古老下地壳物质部分熔融的岩浆产物,并有少量地幔物质的加入,形成于古特提斯俯冲碰撞形成的岛弧背景下局部拉张的构造环境.
The study on the tectono-magmatic mineralization of the Gangdese Indosinian is relatively deficient.This paper takes Lalong granodiorite masses located in the Gangdese Lunggar-Nyainqentanglha tectono-magmatic belt as the research object.The field geological surveying,petrology,LA-ICP-MS zircon U-Pb dating,geochemistry and Hf isotope data are systematically studied to discuss the petrogenesis and tectonic settings.It is found that the LA-ICP-MS zircon U-Pb ages show a weighted average age between 223.5±3.9 Ma and 225.4±4.9 Ma,indicating that they formed in Late Triassic epoch,and they are proba-bly tectonic-magmatic products of late period of Indosinian.The rocks show low Ti(w(TiO_2)=0.46%-0.73%),rich in Si(w(SiO_2)=63.24%-67.94%),Al(w(Al_2O_3)=14.14%-15.85%),Na(w(Na_2 O)=2.58%-3.04%)and K(w(K_2 O)=3.06%-4.89%),belonging to the high-K calc-alkaline to shoshonite series and weakly peraluminous;enrichment in REE,and theΣREE is 138.62×10~(-6) to 255.53×10~(-6).The rare earth element distribution pattern is the right tilt type of the light rare earth element enrichment,the(La/Yb)_N=8.35-17.90,with negative Eu anomaly(Eu/Eu*=0.54-0.69)and without Ce anomaly(Ce/Ce*=0.92-1.02).The rocks show depletion in Ba,Nb,Ta,Sr,Ti and P;enrichment in Rb,K,Th,U,Zr and Hf in the trace elements.Theε_(Hf)(t)=-6.4-2.5,coinciding with two-phase model age(tDM2)of the crust of 980-1 479 Ma,and a same geologic age with the Nyainqentanglha Group.Lalong granodiorite masses belong to A-type granite.They are partially melted magmatic products induced by ancient lower crust material,and accompanied by a small amount of mantle material.They are formed by the local extension of the tectonic setting in the island arc environment formed by the ancient Tethys subduction.
The study on the tectono-magmatic mineralization of the Gangdese Indosinian is relatively deficient.This paper takes Lalong granodiorite masses located in the Gangdese Lunggar-Nyainqentanglha tectono-magmatic belt as the research object.The field geological surveying,petrology,LA-ICP-MS zircon U-Pb dating,geochemistry and Hf isotope data are systematically studied to discuss the petrogenesis and tectonic settings.It is found that the LA-ICP-MS zircon U-Pb ages show a weighted average age between 223.5±3.9 Ma and 225.4±4.9 Ma,indicating that they formed in Late Triassic epoch,and they are proba-bly tectonic-magmatic products of late period of Indosinian.The rocks show low Ti(w(TiO_2)=0.46%-0.73%),rich in Si(w(SiO_2)=63.24%-67.94%),Al(w(Al_2O_3)=14.14%-15.85%),Na(w(Na_2 O)=2.58%-3.04%)and K(w(K_2 O)=3.06%-4.89%),belonging to the high-K calc-alkaline to shoshonite series and weakly peraluminous;enrichment in REE,and theΣREE is 138.62×10~(-6) to 255.53×10~(-6).The rare earth element distribution pattern is the right tilt type of the light rare earth element enrichment,the(La/Yb)_N=8.35-17.90,with negative Eu anomaly(Eu/Eu*=0.54-0.69)and without Ce anomaly(Ce/Ce*=0.92-1.02).The rocks show depletion in Ba,Nb,Ta,Sr,Ti and P;enrichment in Rb,K,Th,U,Zr and Hf in the trace elements.Theε_(Hf)(t)=-6.4-2.5,coinciding with two-phase model age(tDM2)of the crust of 980-1 479 Ma,and a same geologic age with the Nyainqentanglha Group.Lalong granodiorite masses belong to A-type granite.They are partially melted magmatic products induced by ancient lower crust material,and accompanied by a small amount of mantle material.They are formed by the local extension of the tectonic setting in the island arc environment formed by the ancient Tethys subduction.
引文
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