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DISCOVERY OF THE EARLY JURASSIC VOLCANIC ROCKS IN XINLIN AREA OF NORTHERN DAXINGANLING MOUNTAINS: Geological Implication |
LIU Tao1, JI Feng2, WANG Wen-dong1, WANG Jiu-yi1, ZHAO Xi-dong1 |
1. Harbin Center of Comprehensive Natural Resources Survey, CGS, Harbin 150086, China; 2. No.3 Oil Production Plant Geological Institute of Daqing Oilfield Ltd., Co., Daqing 163000, Heilongjiang Province, China |
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Abstract 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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Received: 09 August 2021
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