Zanhuang Complex, Hebei, Chinai

Regional Level Types
Zanhuang Complex	Complex
Hebei	Province
China	Country

The Zanhuang Complex, located in Hebei province, spans approximately 40–60 km in width from east to west and nearly 140 km in length from north to south, encompassing a total area of around 3850 km2. Its principal configuration resembles a “spindle,” trending in the NNE–SSW direction. Comprising a typical Pre-Cambrian metamorphic complex, the Zanhuang rock complex comprises late Archean TTG gneiss, potassic-two feldspar gneiss, the Zanhuang Complex, and the late Archeozoic—Paleo-Proterozoic Guandu group. To the west of this complex, it is unconformably overlain by the slightly metamorphic Gantaohe group, with localized fault contacts. To the south and west, it is unconformably covered by the Changcheng series, mid-Proterozoic strata. Numerous previous studies have focused on this rock complex. Among them, the TTG gneiss primarily consists of tonalitic gneiss dated to approximately 2.7 billion years ago and tonalitic-ganodioritic gneiss dated between 2.55 and 2.50 billion years ago. All these gneisses are believed to have formed through plate melting processes in a subduction setting [25,26,35], while the potassic-two feldspar granitic gneiss serves as indicators for syn-collisional or post-collisional tectonic settings.
The Zanhuang Complex is delineated into three divisions: east, central, and west. Along the western margin of the central division lies a significant tectonic suture zone. The formation of the Zanhuang Complex resulted from the collision and amalgamation of the eastern block of the North China Craton with the Fuping continental block along this tectonic suture zone 1880–1850 million years ago. Within the west division (WZD), the exposed formations primarily consist of TTG gneiss, migmatites, and anatectic granites. The central division (CZD) predominantly comprises quartz schist, volcanic sedimentary rock series, pelitic gneiss, orthogneiss-migmatite, and marble. Conversely, the east division (EZD) shares similarities with the west, featuring primarily TTG gneiss, pelitic gneiss, amphibolitic gneiss, and migmatites.

Other Regions, Features and Areas that Intersect

References