大别造山带姚冲花岗岩岩石地球化学特征及其地质意义
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摘要
姚冲岩体位于秦岭-大别山造山带上,岩体的主要岩性为黑云母花岗岩和花岗斑岩。岩石地球化学分析结果显示,姚冲岩体SiO_2含量为71.28%~77.24%,K_2O含量为3.81%~5.28%,Na_2O含量为3.76%~5.03%,Al_2O_3含量为11.61%~14.6%,具有高钾钙碱性和准铝质-过铝质(A/CNK=0.96~1.03)特征。岩石稀土元素总量较低(11.82×10~(-6)~123.65×10~(-6)),轻稀土元素相对富集,重稀土元素相对亏损,具有Eu负异常,岩体富集Rb、U、Hf和Y,亏损Ba、Nb、Ta和Ti,显示出I型花岗岩的特点。锆石Hf同位素分析结果表明,姚冲岩体的ε_(Hf)(t)值为-30~-22.8,位于地幔演化线之下,t_(DM2)值变化于2.21~2.60Ga之间,指示其源于扬子板块北缘的古老地壳,其组成类似于扬子板块北缘TTG型岩浆岩。结合区域地质背景,姚冲岩体形成于扬子陆块与华北陆块碰撞造山后的陆内伸展环境,对应的地球动力学背景为晚侏罗世—早白垩世地壳从挤压收缩向区域性伸展的构造体制大转换过程。
Located in the Qinling-Dabie orogenic belt, the Yaochong granite body mainly consists of biotite granite and granite porphyry. According to the geochemical analysis, Yaochong granites have the following data: SiO_2=71.28% ~77.24%, K_2O=3.81% ~5.28%, Na_2O=3.76%~5.03%, Al_2O_3=11.61%~14.6%, and A/CNK=0.96~1.03. The rocks are enriched in LREE, depleted in HREE with negative Eu anomalies, enriched in Rb, U, Hf, Y and depleted in Ba, Nb, Ta, Ti, which indicates that Yaochong granites belong to metaluminous to peraluminous, high-K calc-alkaline I-type granite. According to zircon Hf isotope analysis, the ε_(Hf)(t) values of the granite range from-30 to-22.8, lying below the depleted mantle line. The t_(DM2) values range from 2.21 Ga to 2.60 Ga,which indicates that the granite resulted from the lower crust of Yangtze block. The components of the granite porphyry are similar to those of Neoproterozoic TTG magmatic rocks. Yaochong granites were emplaced after the major collisional period of the North China block and Yangtze block, in a post-collisional tectonic setting under the regional extension mechanism. The geodynamic setting was the transformation of the tectonic regime of the late Jurassic-Early Cretaceous period.
Located in the Qinling-Dabie orogenic belt, the Yaochong granite body mainly consists of biotite granite and granite porphyry. According to the geochemical analysis, Yaochong granites have the following data: SiO_2=71.28% ~77.24%, K_2O=3.81% ~5.28%, Na_2O=3.76%~5.03%, Al_2O_3=11.61%~14.6%, and A/CNK=0.96~1.03. The rocks are enriched in LREE, depleted in HREE with negative Eu anomalies, enriched in Rb, U, Hf, Y and depleted in Ba, Nb, Ta, Ti, which indicates that Yaochong granites belong to metaluminous to peraluminous, high-K calc-alkaline I-type granite. According to zircon Hf isotope analysis, the ε_(Hf)(t) values of the granite range from-30 to-22.8, lying below the depleted mantle line. The t_(DM2) values range from 2.21 Ga to 2.60 Ga,which indicates that the granite resulted from the lower crust of Yangtze block. The components of the granite porphyry are similar to those of Neoproterozoic TTG magmatic rocks. Yaochong granites were emplaced after the major collisional period of the North China block and Yangtze block, in a post-collisional tectonic setting under the regional extension mechanism. The geodynamic setting was the transformation of the tectonic regime of the late Jurassic-Early Cretaceous period.
引文
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