湖南锡田含W-SnA型花岗岩年代学与地球化学特征
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摘要
锡田复式花岗岩体位于湘赣交界处,是南岭地区重要的含W-Sn多金属矿花岗岩体之一。本文对锡田垄上赋矿细粒花岗岩进行了LA-ICP-MS年代学及地球化学研究。锆石U-Pb年代学研究表明,锡田花岗岩结晶年龄为151.7±1.2 Ma,与前人采用SHRIMP锆石U-Pb定年法所获得的年龄一致,表明其形成于燕山早期。锡田垄上细粒花岗岩具有高Si(SiO_2=73.44%~78.45%)、高K(K_2O/Na_2O=1.00~253.77)、低Ca(CaO=0.25%~2.22%)、贫Mg(MgO=0.05%~0.42%)、富Al(Al_2O_3=11.20%~13.90%)的特征,为准铝质至强过铝质(A/CNK=0.90~3.44),同时强烈亏损Sr、Ba、P、Ti、Nb、Eu(δEu=0.004~0.076)等元素,富集高场强元素Th、Ta和Hf,以及大离子亲石元素Rb和LREE等。主量元素和微量元素分析表明,锡田垄上细粒花岗岩具有A型花岗岩特征。Sr-Nd同位素研究结果显示,岩石具有相对较高的ε_(Nd)(t)(7.30~8.87)值,其两阶段Nd模式年龄集中在1.56~1.69 Ga之间,暗示其可能主要来源于古老地壳物质的部分熔融。综合研究表明,锡田花岗岩的形成可能与古太平洋板块俯冲消减引起的拉张环境有关。同时锡田细粒花岗岩显示出良好的Sn成矿性,是比较典型的含锡花岗岩。
The Xitian granites are located in the bordering area of Hunan province and Jiangxi province,which is an important part of the Nanling granite belt closely related to tin-tungsten polymetallic deposits.Zircon LA-ICP-MS U-Pb dating of the Longshang fine-grained granite yields an age of 151.7±1.2 Ma,which is the same as previous reported SHRIMP U-Pb ages,indicating the Xitian granites was emplaced in Yanshanian.The granites are characterized by high contents of silicon(SiO_2 =73.44%~78.45%),potassium(K2 O/Na2 O=1.00~253.77),aluminum(Al2 O3 =11.20%~ 13.90%),low in calcium(CaO=0.25%~2.22%) and magnesium(MgO=0.05%~0.42%),metaluminous to strongly peraluminous(A/CNK=0.90~3.44).The granites show strong depletion of Sr,Ba,P,Ti,Nb and Eu(δEu=0.004~0.076),enrichment of Th,Ta,Hf,Rb and LREE.The major and trace element concentrations of the fine-grained granite in Longshang of the Xitian area show that the granite is of A-type.The low ε_(Nd)(t)(7.30~ 8.87) and two stage Nd modal ages ranging from 1.56 Ga to 1.69 Ga suggest that the magma may have derived mainly from partial melting of the old crustal materials.The formation of the Xitian granites may be related to the extension caused by the subduction of palaeo-Pacific plate.The Xitian granites as typical tin-bearing rocks are promising for Tin exploration.
The Xitian granites are located in the bordering area of Hunan province and Jiangxi province,which is an important part of the Nanling granite belt closely related to tin-tungsten polymetallic deposits.Zircon LA-ICP-MS U-Pb dating of the Longshang fine-grained granite yields an age of 151.7±1.2 Ma,which is the same as previous reported SHRIMP U-Pb ages,indicating the Xitian granites was emplaced in Yanshanian.The granites are characterized by high contents of silicon(SiO_2 =73.44%~78.45%),potassium(K2 O/Na2 O=1.00~253.77),aluminum(Al2 O3 =11.20%~ 13.90%),low in calcium(CaO=0.25%~2.22%) and magnesium(MgO=0.05%~0.42%),metaluminous to strongly peraluminous(A/CNK=0.90~3.44).The granites show strong depletion of Sr,Ba,P,Ti,Nb and Eu(δEu=0.004~0.076),enrichment of Th,Ta,Hf,Rb and LREE.The major and trace element concentrations of the fine-grained granite in Longshang of the Xitian area show that the granite is of A-type.The low ε_(Nd)(t)(7.30~ 8.87) and two stage Nd modal ages ranging from 1.56 Ga to 1.69 Ga suggest that the magma may have derived mainly from partial melting of the old crustal materials.The formation of the Xitian granites may be related to the extension caused by the subduction of palaeo-Pacific plate.The Xitian granites as typical tin-bearing rocks are promising for Tin exploration.
引文
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