Citation: | YANG Quanlin, YE Feng, DONG Guochen. Zircon U- Pb age and geological significance of quartz monzonite from Qingjianpo, Shanxi Province[J]. Geological Bulletin of China, 2019, 38(9): 1501-1510. |
In this paper, based on the study of Qingjianpo quartz monzonite of zircon U-Pb isotope age, and combine with the major element data and rare earth elementdata, the authors investigated its geological significance. The LA-ICP-MS zircon U-Pb isotopic age of quartz monzonite is 241.1±1.7Ma, revealing that it is a product of the Early-Middle Triassic magmatism. The rock is enriched in K, Na, Si, Al and depleted in Mg, Ca, Ti, belonging to high calc alkaline shoshonite series and peraluminous granitoid. The rock exhibits the enrichment of LREE relative to HREE, and Eu shows weak negative anomaly. The genetic type of Qingjianpo quartz monzonite is I-type granite. with some features of S-type granites. Qingjianpo quartz monzonite characteristics indicate that the rock was formed from partial melting of the mid-lower crust, with the addition of mantle material. Qingjianpo quartz monzonite is a part of the alkaline magmatic belt of Middle Triassic on the northern margin of North China Craton, and it was formed in the extensional tectonic environment of late orogenic-post-orogenic activity.
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Simplified map of major tectonic units of the north China craton(a) and geological sketch map of the study area(b)
CL images of representative zircons from Qingjianpo quartz monzonite
U-Pb concordia diagrams for zircons(a)and U-Th diagram(b)of Qingjianpo quartz monzonite
Classification and series diagrams of Qingjianpo quartz monzonite
A/NK vs A/CNK plot(a) and chondrite-normalalized REE patterns(b) of Qingjianpo quartz monzonite
The zircon U-Pb ages of Qingjianpo quartz monzonite(a) and zircon U-Pb ages in the region(b)
SiO2-P2O5(a)and La-La/Sm(b)diagrams for Qingjianpo quartz monzonite
δEu-(La/Yb)N(a)and MgO-TFeO(b)diagrams for Qingjianpo quartz monzonite
Discriminant diagram of R1-R2 factor for Qingjianpo quartz monzonite