Neoproterozoic Mafic-Ultramafic Intrusions from the Fanjingshan Region, South China: Implications for Subduction-Related Magmatism in the Jiangnan Fold Belt

Neoproterozoic mafic-ultramafic intrusions from the Fanjingshan region, South China, provide evidence of subduction-related magmatism preceding the amalgamation of the Yangtze and Cathaysia Blocks. These rocks, primarily olivine pyroxenites and gabbros, show minimal crustal contamination and isotopic signatures indicative of a mantle wedge metasomatized by slab-derived fluids and melts. Their compositional similarities to Alaskan-type intrusions further support their formation in a subduction-related environment. The study utilized geochemical and isotopic analyses (e.g., εNd(t), 207Pb/204Pb, Os-Re-Os) to characterize the magmatic sources and processes, offering insights into the tectonic evolution of the Jiangnan Fold Belt during the Neoproterozoic.

Wang, W., Zhao, J.-H., Zhou, M.-F., Yang, S.-H., & Chen, F.-K. (2014). Neoproterozoic Mafic-Ultramafic Intrusions from the Fanjingshan Region, South China: Implications for Subduction-Related Magmatism in the Jiangnan Fold Belt. The Journal of Geology, 122(4), 455–473. https://doi.org/10.1086/676596