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
Geochronology, geochemistry and petrogenesis of the Kongwusayi A-type granites in the eastern Alataw Mountain, West Tianshan, Xinjiang
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文摘
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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. |
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其他语种文摘
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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 10~4Ga/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)),higher ε_(Nd)(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 lower ε_(Nd)(t) and higher (~(87)Sr/~(86)Sr)_i. indicating the magma source of the kongwusayi A-type granites may include the ancient crustal materials. |
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来源
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地质学报
,2019,93(5):1020-1036 【核心库】
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DOI
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10.19762/j.cnki.dizhixuebao.2019051
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关键词
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阿拉套山
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A型花岗岩
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锆石U-Pb年代学
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岩石成因
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氧逸度
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地址
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1.
合肥工业大学资源与环境工程学院, 合肥, 230009
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安徽省地质矿产局第二水文工程地质勘查院, 安徽, 芜湖, 241000
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安徽省矿产资源与矿山环境工程技术研究中心, 安徽省矿产资源与矿山环境工程技术研究中心, 合肥, 230009
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南方科技大学地球与空间科学系, 广东, 深圳, 518055
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中国地质大学(北京)地球科学与资源学院, 北京, 100083
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0001-5717 |
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基金
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国家自然科学基金
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中央高校基本科研业务费专项资金
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文献收藏号
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CSCD:6494414
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