新疆西天山阿拉套山东部孔吾萨依A型花岗岩成岩年代、地球化学特征及成因
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摘要
孔吾萨依花岗岩体位于新疆西天山阿拉套山南坡东侧,岩体主要由碱长花岗岩、粗粒钾长花岗岩、细粒钾长花岗岩组成。碱长花岗岩的~(206)Pb/~(238)U加权平均年龄值为293.1±3.6Ma,细粒钾长花岗岩的年龄为293±3.7Ma。三类花岗岩具相似的地球化学特征,属准铝质—弱过铝质的高钾钙碱性系列花岗岩。从碱长花岗岩到粗粒钾长花岗岩再到细粒钾长花岗岩,其Eu负异常程度越来越高,元素Ba、Sr、P、Ti等的亏损及Rb、Th、U等的富集程度逐步增高,显示三者的岩浆之间具有结晶分异趋势。碱长花岗岩、粗粒钾长花岗岩及细粒钾长花岗岩均富Ga(10~4Ga/Al比值2.6～3.5)、高Fe~*值(=FeO~T/(FeO~T+MgO),0.88～0.97)和具较高的TiO_2/MgO比值(0.51～1.25),显示出典型A型花岗岩的特征。研究区A型花岗岩具有高的锆石饱和温度(853.86～931.56℃)和低的锆石Ce(Ⅳ)/Ce(Ⅲ)比值(1.9～77),暗示该A型花岗岩岩浆形成于高温和低氧逸度条件下。三类花岗岩具较高的Y含量(43.3×10~(-6)～106×10~(-6))、较高的ε_(Nd)(t)(+3.0～+5.2)和较低的(~(87)Sr/~(86)Sr)_i值(0.7027～0.7069),表明孔吾萨依A型花岗岩可能源于玄武质地壳的部分熔融。但与西天山石炭纪玄武岩相比,孔吾萨依花岗岩的ε_(Nd)(t)值较低,而(~(87)Sr/~(86)Sr)_i值较高,因此孔吾萨依花岗岩的岩浆源区应有古老地壳物质的加入。
The Kongwusayi granitic pluton is located in the south slope and east side of the Alataw Mountain,West Tianshan of Xinjiang.The pluton is composed mainly of alkali-feldspar granite,coarse grained Kfeldspar granite and fine grained K-feldspar granite.The weighted average U-Pb age of zircons in the alkali-feldspar granite and the fine grained K-feldspar granite are 293.1±3.6 Ma and 293±3.7 Ma,respectively.The three types of granites belong to aluminum-weakly peraluminous and high potassium calcium alkaline series.Eu negative anomalies increase quickly from the alkali feldspar granite to the coarse grained K-feldspar granite and the fine grained K-feldspar granite,and depletion degree of Ba,Sr,P,Ti and the enrichment degree of Rb,Th,U are gradually increasing,indicating a tendency of crystallization differentiation between the three magma types.These granites are enriched in Ga with high 104 Ga/Al(2.6～3.5),Fe*(0.88～0.97)and TiO_2/MgO(0.51～1.25),suggesting that they are characteristic of A-type granites.A-type granites in the study area are characterzied by the high saturation temperature of zircons(853.86～931.56℃)and low Ce(Ⅳ)/Ce(Ⅲ)(1.9～77),implying that the A-type granites were formed in higher temperature and lower oxygen fugacity conditions.The Kongwusayi granites have higher Y content(43.3×10~(-6)～106×10~(-6)),higherεNd(t)(+3.0～ +5.2)and lower(~(87)Sr/~(86)Sr)i(0.7027～0.7069),suggesting that the Kongwusayi A-type granites may formed by the partial melting of the basaltic crust.By comparing with the carboniferous basalt in West Tianshan,the Kongwusayi A-type granites display lowerεNd(t)and higher(~(87)Sr/~(86)Sr)i,indicating the magma source of the kongwusayi A-type granites may include the ancient crustal materials.
The Kongwusayi granitic pluton is located in the south slope and east side of the Alataw Mountain,West Tianshan of Xinjiang.The pluton is composed mainly of alkali-feldspar granite,coarse grained Kfeldspar granite and fine grained K-feldspar granite.The weighted average U-Pb age of zircons in the alkali-feldspar granite and the fine grained K-feldspar granite are 293.1±3.6 Ma and 293±3.7 Ma,respectively.The three types of granites belong to aluminum-weakly peraluminous and high potassium calcium alkaline series.Eu negative anomalies increase quickly from the alkali feldspar granite to the coarse grained K-feldspar granite and the fine grained K-feldspar granite,and depletion degree of Ba,Sr,P,Ti and the enrichment degree of Rb,Th,U are gradually increasing,indicating a tendency of crystallization differentiation between the three magma types.These granites are enriched in Ga with high 104 Ga/Al(2.6～3.5),Fe*(0.88～0.97)and TiO_2/MgO(0.51～1.25),suggesting that they are characteristic of A-type granites.A-type granites in the study area are characterzied by the high saturation temperature of zircons(853.86～931.56℃)and low Ce(Ⅳ)/Ce(Ⅲ)(1.9～77),implying that the A-type granites were formed in higher temperature and lower oxygen fugacity conditions.The Kongwusayi granites have higher Y content(43.3×10~(-6)～106×10~(-6)),higherεNd(t)(+3.0～ +5.2)and lower(~(87)Sr/~(86)Sr)i(0.7027～0.7069),suggesting that the Kongwusayi A-type granites may formed by the partial melting of the basaltic crust.By comparing with the carboniferous basalt in West Tianshan,the Kongwusayi A-type granites display lowerεNd(t)and higher(~(87)Sr/~(86)Sr)i,indicating the magma source of the kongwusayi A-type granites may include the ancient crustal materials.
引文
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