Structural relationships and kinematics of the Neoarchean Dengfeng forearc and accretionary complexes, southern North China craton

Huang, Bo
Kusky, Timothy
Wang, Lu
Polat, Ali
Fu, Dong
Windley, Brian
Deng, Hao
Wang, Junpeng
The ca. 2.54-2.51 Ga Dengfeng greenstone belt in the southern section of the Central orogenic belt of the North China craton consists of structurally juxtaposed slices of meta-ultramafic, metamafic, and felsic igneous rocks, metasedimentary rocks, including minor banded iron formation. The complex was metamorphosed to greenschist to amphibolite facies at ca. 2.5 Ga and intruded by ca. 2.50-2.42 Ga mafic and felsic plutons/dikes. Detailed field mapping and structural analyses show that the different lithostructural units, including a metamafic-dominant unit and a metasedimentary-dominant unit, are in tectonic contact, with complex thrust imbrication and multiple brittle and ductile deformation. The metasedimentary-dominant unit consists of coherent schist-metabasalt sequences, metaturbidites, and chaotic melanges that are characterized by typical duplex structures and block-in-matrix fabrics, closely resembling the lithostratigraphy and structural patterns of Phanerozoic accretionary complexes. Together with distinctive and diagnostic geochemical signatures of metabasalts, sanukitoid-like metadiorite, and syntectonic adakitic sills/dikes, we interpret the Dengfeng greenstone belt as Neoarchean forearc and accretionary complexes consisting of dismembered forearc crustal sheets in the west and accreted oceanic plate stratigraphy in the east that were structurally imbricated at a convergent plate margin. The kinematic indicators and the spatial configurations of different tectonic units suggest a near-southwest-dipping intra-oceanic subduction zone beneath the arc in the Central orogenic belt, which later evolved into an arc-continent collision with the Eastern block. The accreted arc and accretionary prism are unconformably overlain by a clastic sedimentary wedge, the lower part of which has a maximum depositional age of ca. 2.45 Ga and is interpreted as a foreland basin sequence related to this collision. Documentation of the Neoarchean Dengfeng forearc and accretionary complexes demonstrates that ca. 2.5 Ga intra-oceanic subduction, oceanic plate stratigraphy accretion, and arc-continent collisional events occurred in the southern section of the Central orogenic belt of the North China craton. The accretion of the 2.54-2.51 Ga arc to the continental margin of the Eastern block marks an early episode of mountain building in the Central orogenic belt, which played an important role in the lateral growth of the North China craton.


Comment on 'Rockfall avalance deposits associated with normal faulting in the NW of the Cankiri basin: implications for the post-collisional tectonic evolution of the Neo-Tethyan suture zone' by G. Seyitoglu, N. Kazanci, L. Karadenizli, S. Sen, B. Varol, and T. Karabiyikoglu
Kaymakcı, Nuretdin (Wiley, 2003-04-01)
Seyitoglu et al. (2000) described their interpretation, based on a single fault surface and rockfall avalanche deposits previously mapped as a W-vergent thrust klippen above the Neogene successions in the Hancili Basin, that in central Anatolia there was a single extensional basin throughout the Miocene - Early Pliocene. It was later fragmented by a structural high of Neo-Tethyan ophiolitic basement bounded by an E-vergent thrust fault in the east along the western margin of the Cankiri Basin and a west-dip...
Geology of a Neoarchean suture: Evidence from the Zunhua ophiolitic melange of the Eastern Hebei Province, North China Craton
Wang, Junpeng; Li, Xiawen; Ning, Wenbin; Kusky, Timothy M.; Wang, Lu; Polat, Ali; Deng, Hao (Geological Society of America, 2019-11-01)
Melanges characterize Phanerozoic convergent plate boundaries, but have rarely been reported from Archean orogens. In this paper, we document a Neoarchean ophiolitic melange in the Eastern Hebei Province of the North China Craton. The Zunhua ophiolitic melange is composed of a structural mixture of metapelites, ortho- and para-gneisses, and magnetite-quartzite mixed with exotic tectonic mafic blocks of metabasalts, metagab - broic rocks, and metadiabases, along with ultramafic blocks of serpentinized perido...
Structural evolution of the Gediz Graben, SW Turkey: temporal and spatial variation of the graben basin
Ciftci, N. B.; Bozkurt, Erdin (Wiley, 2010-12-01)
The structural evolution of the Miocene to Recent Gediz Graben is intimately related to the evolution of its southern margin. This margin is shaped by a time-transgressive, composite structure that possesses flat-ramp geometry with three separate dip domains: a low-angle shallow segment; a steeper middle segment; and a low-angle deeper segment. This geometry was probably produced by one of two mechanisms, which operated perpendicular to the general trend of the graben, resulting in gradual back-rotation fol...
DIRIK, K (Wiley; 1993-12-01)
The study area is located in the southern part of the Central Pontides. The rocks exposed in this region have been divided into three major groups: basement, cover sequence and volcanic rocks. The basement rocks are composed of metamorphic units and a chaotic assemblage derived from an accretionary prism produced during the northward subduction of northern Neo-Tethys during the Late Cretaceous. During the same period, the basal element of the cover sequence, a thick and coarsening upward flysch succession (...
Geochemistry and petrogenesis of the oceanic island and subduction-related assemblages from the palaeotethyan Karakaya subduction/accretion complex, central and nw Turkey
Sayıt, Kaan; Göncüoğlu, Mehmet Cemal; Department of Geological Engineering (2010)
The Nilüfer Unit of the Karakaya Complex at the pre-Liassic basement of the Sakarya Composite Terrane is composed mainly of metabasaltic lithologies with limestones, and minor cherts and mudstones. These metabasic assemblages show OIB- and E-MORB-type geochemical signatures with variable enrichment in the most incompatible elements relative to N-MORB. The Eymir Unit consists of variably deformed metaclastics, and constitutes the matrix in which the Nilüfer-type blocks are embedded. In the Ankara region, the...
Citation Formats
B. Huang et al., “Structural relationships and kinematics of the Neoarchean Dengfeng forearc and accretionary complexes, southern North China craton,” GEOLOGICAL SOCIETY OF AMERICA BULLETIN, pp. 966–996, 2019, Accessed: 00, 2020. [Online]. Available: