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Neoproterozoic magmatism along the northwestern margin of the Yangtze Block, South China, produced voluminous adakitic and normal arc felsic intrusions associated with many mafic–ultramafic bodies. Dioritic plutons are rare but are important for understanding the crustal growth and secular evolution of the region. The Xixiang dioritic intrusion at Hannan, on the northwestern margin of the Yangtze...
The 820-Ma Wangjiangshan, 814-Ma Beiba, 780-Ma Bijigou and 746-Ma Luojiaba mafic–ultramafic intrusions in the Hannan region of the northern margin of the Yangtze Block, South China, are used to constrain the secular evolution of the lithospheric mantle. These intrusions are mainly composed of gabbros, but the Beiba and Wangjiangshan intrusions also contain diorite. Rocks from these four intrusions...
The ~260-Ma Emeishan large igneous province in SW China and northern Vietnam contains low-Ti tholeiitic basalts, high-Ti alkaline basalts and minor peralkaline volcanic rocks. The flood basalts in Longzhoushan, Sichuan Province, SW China, comprise four units, each of which has volcanic breccia at the base. From the base upward, rocks of Units 1 and 2 are high-Ti basalts with relatively high MgO (7...
The ∼260 Ma Xinjie mafic–ultramafic intrusion in the Emeishan large igneous province, SW China, is a sill-like body hosting Fe–Ti–Cr oxide mineralization. The intrusion comprises, from the base upward, a marginal zone and three cyclic zones. Fe–Ti oxides (magnetite and ilmenite) are disseminated throughout the intrusion and the oxide mineralization includes several Fe–Ti oxide-rich layers. The oxides...
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