Citation: | ZHU Wei, ZHANG Zhengping, SUN Yingshu, CHENG Haifeng, TI Zhenhai, DU Jinli, SU Pengtao, FENG Yipeng, LIANG Guoqing. Time constraint on the closing of the Paleo-Asian Ocean in northern Beishan of Inner Mongolia: Evidence from Heihongshan admellite[J]. Geological Bulletin of China, 2019, 38(11): 1846-1857. |
The Late Carboniferous admellite in the Heihongshan area is located in the northern part of the Hongshishan-Baiheshan-Pengboshan ophiolite belt. The geochemical characteristics show that the admellite belongs to metaluminous to weakly peralic potassium aluminous calc alkaline series I type granite of high differentiation; its LREE enrichment and LREE and HREE fractionation are obvious, with weak Eu negative anomaly and right-inclined rare earth curve. Trace elements are relatively enriched in Ba, K, Zr and Hf but depleted in Nb, Ti, P and Sr, indicating the characteristics of intrusive rocks related to subduction and formed in the volcanic arc environment before collision. The U-Pb dating of LA-ICP-MS zircon yielded weighted average 206Pb/238U age of 315.2±2.5Ma. Comprehensive studies show that the Heihongshan area belonged to the volcanic arcs on the active continental margin in the Late Carboniferous epoch, and the Hongshishan-Baiheshan-Pengboshan ophiolite belt suggests that the oceanic basin in Heihongshan area was closed in the Late Carboniferous epoch.
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① | 河北省区域地质调查院. K-47-E-010012(黑红山)幅2018年度区域地质调查工作方案. 2018. |
Tectonic location map of the Beishan area
Simplified geological map of the study area
Structure (a) and microstructure (b) photographs of admellite
SiO2-(Na2O+K2O) diagram
F-A-M diagram for the intrusive rocks
A/CNK-A/NK (a) and SiO2-K2O (b) diagrams for the intrusive rocks
Chondrite-normalized REE patterns
Primitive mantle-normalized trace element spider diagrams
CL images of selected zircons from admellite(PM03TW1)
LA-ICP-MS zircon U-Pb concordia diagrams of admellite(PM03TW1)
K2O-Na2O genetic type discrimination diagram
C/MF-A/MF discrimination diagram
Tectonic discrimination diagrams
Rb-Hf-Ta diagram of admellite