Geochemical characteristics and tectonic setting of basaltic rocks of the Tamulangou Formation at the northern end of the Da Hinggan Mountains, China
Geochemical characteristics and tectonic setting of basaltic rocks of the Tamulangou Formation at the northern end of the Da Hinggan Mountains, China
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发表时间：
2005
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通讯作者：
Zhang Yuelong
中科院分区：
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作者：
Zhang Yuelong
大兴安岭北部晚侏罗世塔木兰沟组玄武岩具有富碱（K2O+Na2O5.45%）、高K2O（2.15%～3.75%）、高K2O/Na2O比值（0.48～1.12）、Th/Ta、Ce/Nb、Ta/Nb等特征，大离子亲石元素强富集。 （LILE）和轻稀土元素（LREE），属于肖肖铁矿系列。对现有数据的分析表明，这些钾玄岩是在大陆板内环境中形成的。地球化学特征表明，这些钾玄岩的原生岩浆经历了强烈的结晶分异作用，并受到前中生代基底物质的污染。
Basaltic rocks of the Late Jurassic Tamulangou Formation in the northern Da Hinggan Mountains are characterized by rich alkalis (K2O+Na2O5.45%),high K2O (2.15%- 3.75%),high ratios of K2O /Na2O (0.48- 1.12),Th /Ta,Ce/Nb and Ta/Nb and strong enrichment in large- ion lithophile elements (LILE)and light rare earth elements (LREE),belonging to the shoshonitic series. Analysis of the available data indicates that these shoshonitic rocks formed in a continental intraplate set- ting. Geochemical characteristics suggest that the primary magma of these shoshonitic rocks underwent strong crystallization dif- ferentiation and was contaminated with pre- Mesozoic basement materials.