Early Ordovician to Early Permian tectonic evolution of the northern Western Kunlun Orogen ( NW China): Insights from the Omixia Complex and surrounding rocks

作者：Miao Sang, Wenjiao Xiao, Yang He, Yin Liu, Peng Huang, Qigui Mao, Zhou Tan, Jingmin Gan, Hao Wang, Rui Li, Zhiheng Ren, Ziyuan Li, Mengqi Gao · 发表于：Geological Journal · 年份：2024 · DOI：10.1002/gj.4983 · 被引用次数：4 · 研究领域：Geological and Geochemical Analysis、Geochemistry and Geologic Mapping、earthquake and tectonic studies

The Palaeozoic tectonic evolution of the Western Kunlun Orogen plays an important role in deciphering the Tethyan tectonic evolution. This study provides new geochronology, geochemistry and Lu–Hf isotopic data of igneous rocks from the Omixia Complex in the eastern section of the northern Western Kunlun, as well as detrital zircon ages from turbidites and meta‐sediments north of it. From the Omixia Complex, the determined ages of five ultramafic–mafic rock samples are approximately 470, 456, 429, 401 and 382 Ma. Two samples of acidic rocks from the same complex yielded ages of approximately 438 and 378 Ma. One pegmatitic plagiogranite sample exhibits feature of accretionary arc granites, while other samples show geochemical characteristics of island arc tholeiite and E‐MORB. Additionally, four turbidite matrix and two limestone samples, with a major peak around ca. 480–500 Ma, have the youngest zircon ages ranging from ca. 481 to 387 Ma, paralleling the age range of igneous rocks in the ophiolitic mélange. The ε Hf ( t ) values of these samples reveal a broad spectrum of crustal and mantle processes. The youngest zircon ages of five meta‐sedimentary rock samples north of the Omixia Complex range from ca. 581 to 535 Ma, with peak ages concentrated around ca. 0.9–1.0 Ga. Their provenance characteristics differ from the turbidite matrix in the southern Omixia Complex and from the meta‐sediments in the northern Tiklik terrane with peak ages of ca. 0.8 Ga. A younger limestone samp...