| Citation: |
PENG Youbo. LA-ICP-MS zircon U-Pb age and geochemical characteristics of Neoarchaean metamorphic plutonic rocks in Kaiyuan area of northern Liaoning Province[J]. Geological Bulletin of China, 2020, 39(5): 670-680.
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LA-ICP-MS zircon U-Pb age and geochemical characteristics of Neoarchaean metamorphic plutonic rocks in Kaiyuan area of northern Liaoning Province
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Abstract
Located in the Kaiyuan area of northern Liaoning Province on the northern margin of North China, the Neoarchaean metamorphic plutonic rocks are mainly composed of monzonitic granitic gneiss, granodioritic gneiss and quartz dioritic gneiss.According to LA-ICP-MS zircon U-Pb dating, they were formed in Neoarchaean, with the 207Pb/206Pb age of 2489.6±9.1 Ma.Neoarchean metamorphic plutonic rocks belong to high-K calc-alkaline-potassium basalt, quasi-aluminium-peraluminous rock series, and are enriched in LREE and relatively depleted in HREE, characterized by partial melting of the lower crust or Archean sedimentary rocks.Based on an analysis of petrology, petrogeochemistry, tectonic environment and emplacement mechanism, and combined with the study of tectonic evolution in adjacent areas, it is considered that the metamorphic plutonic magma in Kaiyuan area of northern Liaoning came from relatively shallow local melting of basic paleocontinental crust.Geotectonic location was in the contact zone between oceanic crust and continental crust, which indicates that there might have been collision and accretion of continental crust near Qinghe fault in Neoarchean.The diorite-quartz diorite-granodiorite-monzogranitic gneiss body shows that the continental crust has undergone a long period of accretion and continental activity, and has changed from the early basic continental crust to the present silica-alumina continental crust.
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References
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PENG Youbo. LA-ICP-MS zircon U-Pb age and geochemical characteristics of Neoarchaean metamorphic plutonic rocks in Kaiyuan area of northern Liaoning Province[J]. Geological Bulletin of China, 2020, 39(5): 670-680.
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Figure 1.
Geological map of the study area
- Figure 图版Ⅰ.
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Figure 2.
The SiO2-K2O(a)and aluminum saturation index(b)diagrams of the Neoarchaean metamorphic plutonic rocks
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Figure 3.
The diagram of trace elements(a)and REE patterns(b)of the Neoarchaean metamorphic plutonic rocks
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Figure 4.
Zircon CL images, measuring point number, 207Pb/206Pb ages(a)and U-Pb concordia diagram of quartz dioritic gneiss
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Figure 5.
The temperature(a)and pressure(b)diagrams of the Neoarchaean metamorphic plutonic dioritic gneiss
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Figure 6.
The CaO-Na2O-K2O(a) and YbN-(La/Yb)N(b) diagrams of the Neoarchaean metamorphic plutonic rocks
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Figure 7.
The (Y+Nb)-Rb(a)and Yb-Ta(b)diagrams of the Neoarchaean metamorphic plutonic rocks