1.77 Ga A-type granite and dark enclaves in the North Qinling Orogenic Belt: Constrains on the tectonic affinity between the North Qinling Orogenic Belt and the North China Craton

• Published in: Precambrian research 2021-06, Vol.357, p.106117, Article 106117
• Main Authors: Bai, Bowen, Chen, Danling, Zhu, Xiaohui, Ren, Yunfei, Luo, Fenhong, Wang, Haijie, Sun, Hui
• Format: Article
• Language: English
• Subjects: 1.77 Ga A-type granite; Dark enclaves; Geochemistry; LA–ICP–MS zircon dating; North China Craton; North Qinling Orogenic Belt
• ISSN: 0301-9268; 1872-7433
• DOI: 10.1016/j.precamres.2021.106117

•The Hudian monzonitic granite and its dark enclaves were formed at ca. 1.77–1.78 Ga and metamorphosed at ca. 400 Ma.•The Hudian pluton was formed in the southern North China Craton (NCC) in a continental rift environment.•The Hudian monzonitic granite was involved in the North Qinling Orogen Belt (NQOB) at ca. 400 Ma. Before this convergent process, the NQOB has no relation to the NCC. The Hudian gneissic monzonitic granite with lentoid dark enclaves and foliated mafic dykes was exposed in the western segment of the North Qinling Orogenic Belt (NQOB). It has long been considered as an intrusion into the Kuanping Complex, the northernmost component of the NQOB. LA–ICP–MS zircon dating yields consistent formation age of ca. 1.77 Ga for the granite and dark enclaves and the same metamorphic age of ca. 400 Ma for the granite and the mafic dykes. The formation age of ca. 1.77 Ga of the Hudian pluton is much older than the deposition age (