Citation: | LIU Tao, JI Feng, WANG Wen-dong, WANG Jiu-yi, ZHAO Xi-dong. DISCOVERY OF THE EARLY JURASSIC VOLCANIC ROCKS IN XINLIN AREA OF NORTHERN DAXINGANLING MOUNTAINS: Geological Implication[J]. Geology and Resources, 2022, 31(1): 1-12. doi: 10.13686/j.cnki.dzyzy.2022.01.001 |
The Early Jurassic acid volcanic rocks are newly discovered in Zhanbeicun Formation of Xinlin area in northern Daxinganling Mountains, from which two samples of zircon LA-ICP-MS U-Pb ages are determined. The first is sericitized rhyolite, with the testing point deviating to the right side of concordant curve on the concordia diagram-a typical discordant age, yielding the intersecting age with concordant curve of 192.0±1 Ma(MSWD=1.2), which is the cooling crystallization age of rhyolites after extrusion. The second one is weakly silicified rhyolite with a concordant age of 178.0±1 Ma, which is the result of the loss of radioactive trace element Pb, and the rock-forming age should be close to that of the sericitized rhyolite. The volcanic rocks are petrochemically and geochemically characterized by high Ti rhyolite and I-type rhyolite. The Mg# value of the rhyolite(0.43-0.73) and content of hypersthene in CIWP norm minerals (0.25%-0.96%) support that the rhyolite is derived from crystallization-differentiation of basic magma.
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Geological map of Xinlin area in Daxing anling Mountains
Profile of Jurassic Zhanbeicun Formation on the south bank of Manlakai River in Xinlin area
Outcrop and specimen of the Early Jurassic volcanic rocks
CL images and ages of zircons from the rhyolites of Zhanbeicun Formation
The zircon LA-ICP-MS U-Pb concordia diagram of rhyolites from Zhanbeicun Formation
The discrimination diagrams of rhyolites from Zhanbeicun Formation
Chondrite-normalized REE patterns and primitive mantle-normalized trace element spidergram of rhyolites from Zhanbeicun Formation(From References[21-22])