Quantitative REE Modeling for Genesis of Mesozoic Intermediate-Felsic Rocks at Tianzhushan in the Dabie Orogen
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摘要: 大量的同位素地质年代学和地球化学研究表明, 大别山中生代中酸性岩为俯冲扬子陆壳再循环的产物.REE配分的定量模拟计算结果表明, 与基性下地壳相似的北大别基性闪长质片麻岩部分熔融并经过结晶分异能够形成与天柱山中性岩类似的稀土元素组成, 而与中性地壳相似的北大别中性灰色片麻岩部分熔融能够形成与天柱山花岗岩类似的稀土元素组成.残留相微量元素定量计算结果表明, 大别山现今出露的中基性麻粒岩不是部分熔融后形成的残留体.早白垩世地幔超柱事件热扰动所引起的加厚地壳部分熔融后的残留体可能由于比重较大而拆离进入地幔, 从而发生去山根作用和造山带的大面积隆起.Abstract: A large number of studies of geochronology and geochemistry indicate that Mesozoic intermediate-felsic rocks from the Dabie orogen have originated from recycling of the subducted Yangtze continental crust itself. A REE partition simulation suggests that the Tianzhushan intermediate rocks can be generated by partial melting, in coupling with fractional crystallization, of dioritic gneiss which is similar in chemical compositions to the mafic rocks in the lower crust in North Dabie; partial melting of intermediate grey gneiss which is similar in chemical compositions to the middle crust in North Dabie can generate the Tianzhushan felsic rocks. Quantitative calculation of trace element content for the residue after partial melting suggests that intermediate-mafic granulites outcropped in the Dabie orogen are not the residue of partial melting. The residue formed by partial melting of thickened crust due to anomalous heat supply by mantle superwelling at Early Cretaceous is possibly easy to detach from the crust because of its high density, leading to the remove of mountain root and large scale uplift of the orogen.
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Key words:
- intermediate-felsic rock /
- Mesozoic /
- REE /
- quantitative modeling /
- Dabie orogen
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图 2 北大别片麻岩稀土分布模式(数据引自Bryant et al., 2004)
图 3 天柱山花岗岩和中性岩成因模型的稀土元素分布模式
Fig. 3. Modeled REE patterns of granites (a) and intermediate rocks (b) at Tianzhushan
图 4 模拟计算所得中生代酸性岩(a) 和中性岩(b) 残留相不相容元素分布(中性片麻岩数据取自Bryant et al. (2004), 中性麻粒岩数据取自Ma et al. (2000))
Fig. 4. Plot of Modeled patterns of incompatible elements in the residue of Mesozoic acid rocks (a) and intermediate rocks (b) at Tianzhushan
表 1 柱山中酸性岩岩石成因定量模拟数据
Table 1. Data of REE patterns modeled for intermediatefelsic rocks at Tianzhushan
表 2 拟计算所得中生代酸性岩残留相不相容元素组成
Table 2. Modeled compositions of incompatible elements in the residue of Mesozoic felsic rocks at Tianzhushan
表 3 拟计算所得中生代中性岩残留相不相容元素组成
Table 3. Modeled compositions of incompatible elements in the residue of Mesozoic intermediate rocks at Tianzhushan
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