Formation of High-Mg Diorites through Assimilation of Peridotite by Monzodiorite Magma at Crustal Depths
The 134-130 Ma Han-Xing diorite-monzodiorite complex intrudes the central part of the North China block (NCB). The high-Mg diorites have intermediate SiO2, high MgO, Cr and Ni contents, elevated Mg-numbers (Mg#), and are characterized by high Sr and Ba, highly fractionated rare earth elements (REE), and strong Nb and Ta depletions.These geochemical signatures are similar to those of high-Mg adakite and sanukitoid magmas that form through complex crust-mantle interactions. We have investigated...[Show more]
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|Source:||Journal of Petrology|
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