Search

The Yinshan Block constitutes the northwestern segment of the North China Craton. We characterized the geochemistry, zircon U–Pb geochronology, and Hf isotopic composition of a diorite pluton in the Yinshan Block. The zircon U–Pb data yield a protolith formation age of 2535 ± 8 Ma (MSWD = 0.46), followed by recrystallization at 2465 ± 14 Ma or 2431 ± 30 Ma; the granite vein which intruded into the diorite pluton gives a formation age of 2453 ± 5 Ma (MSWD = 1.6), according with the recrystallization age of the diorite. These diorites are characterized by moderate Mg# value and MgO, Cr, and Ni content and have relatively low Sr/Y and (La/Yb)N ratios and slightly Eu anomalies and are enriched in LILEs and depletion in high field strength elements. High‐Sr + Ba granites with low K2O/Na2O characteristics are also shown by these diorites, and the εHf(t) of zircons lie between +1.3 and −7.2, imply these diorites are most likely derived from partial melting of a thickened lower crust with minor involvement of enriched mantle. These geochemical and isotopic characteristics suggest the diorite magmas derived from an accreted arc‐related rocks remelting in a low‐pressure environment along the continent margin. Hereby, we propose a supplement to the model of crustal growth and evolution in the Yinshan Block, involving subduction and collision in the Neoarchean. [ABSTRACT FROM AUTHOR]