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Metasomatism above subduction zones is an important process that produces heterogeneous mantle and thus a diversity of igneous rocks. In the Panzhihua district, on the western margin of the Yangtze Block (SW China), two Neoproterozoic mafic intrusions, one olivine gabbro and one hornblende gabbro, have identical ages of 746±10 and 738±23Ma. Both of the gabbros are tholeiitic in composition and have...
The Neoproterozoic mafic intrusions of the Hannan massif at the northwestern margin of the Yangtze Block in South China are composed mainly of OIB-type gabbros and subduction-related mafic intrusions. Here we present the petrology, geochemistry and zircon U–Pb geochronology of these intrusions. The gabbros are characterized by enrichment of LILE and highly differentiated HFSE patterns, suggesting...
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