辽西北票晚侏罗世蓝旗组火山岩的岩浆演化及其岩石成因

李伍平

doi:10.3799/dqkx.2012.005

Volume 37 Issue 1

Jan. 2012

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LI Wu-ping, 2012. Magma Evolution of the Late Jurassic Volcanic Rocks and Its Genesis of the Lanqi Formation, Beipiao Area, Western Liaoning Province. Earth Science, 37(1): 47-56. doi: 10.3799/dqkx.2012.005

Citation:

LI Wu-ping, 2012. Magma Evolution of the Late Jurassic Volcanic Rocks and Its Genesis of the Lanqi Formation, Beipiao Area, Western Liaoning Province. Earth Science, 37(1): 47-56. doi: 10.3799/dqkx.2012.005

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Magma Evolution of the Late Jurassic Volcanic Rocks and Its Genesis of the Lanqi Formation, Beipiao Area, Western Liaoning Province

doi: 10.3799/dqkx.2012.005

LI Wu-ping

School of Civil Engineering, Guangzhou University, Guangzhou 510006, China

Received Date: 2011-08-29
Publish Date: 2012-01-15

Abstract

Abstract

The Late Jurassic volcanic rocks of the Lanqi Formation in the Beipiao area, the western Liaoning Province, are composed of the lower andesitic breccia lava with tuffs and the upper trachyandesite. Based on the study of geochemistry, andesitic breccia lava are from 56.99% to 58.22% in SiO₂, high Al₂O₃ (> 15%), high MgO (≤4.22%, 0.44 to 0.49 in Mg^#)and low K₂O (< 2.2%) characterizes by high Sr (> 500 μg/g), Cr (> 125 μg/g), Ni (> 47 μg/g) contents and higher Sr/Y ratio (> 28) and low REE (< 112 μg/g), U (< 0.3 μg/g), Th (< 2 μg/g) and HREE (Y < 20 μg/g, Yb < 1.6 μg/g) contents and by strongly fractionated LREE (10.49 to 10.59 in (La/Yb)_N) and distinct positive Sr anomalies and negligible negative Eu anomalies (0.62 to 0.99 in Eu/Eu^*), which are similar to those of the adakitic rock; and trachyandesite are from 52.09% to 61.08% in SiO₂, high Al₂O₃(> 16.6%) and K₂O (> 2%), low MgO (≤2.64%, 0.08 to 0.38 in Mg^#) characterizes by high REE (> 180 μg/g), U (≥0.80 μg/g), Th (> 4 μg/g) and Sr (> 350 μg/g) contents, and low Cr (< 28 μg/g), Ni (< 19 μg/g) contents and low Sr/Y ratio (≤23) and by strongly fractionated LREE (10.22 to 16.28 in (La/Yb)_N) and distinct negative Eu and Sr anomalies, which differ from those of the adakitic rock. All the volcanic rocks also show positive Pb and Ba anomalies, and negative Nb-Ta anomalies, and have moderate ε_Sr(t) (20.15 to 23.34), T_DM (1.45 to 1.50 Ga) and low ε_Nd(t) (-7.69 to -8.62), which are similar to the features of the EMI-like component and of the ancient continental lower crust of the North China craton and the Late Jurassic-Early Cretaceous volcanic rocks in Yanshan orogen belt. In this paper, author thinks that andesitic magmas of Lanqi Formation are derived partial melting of foundered lower continental basaltic crust near the transition between the crust-mantle and occur the interaction of the mantle and crust, and trachyandesitic magmas from partial melting of foundered lower continental basaltic crust. The magma evolution of Lanqi Formation indicates that the process of the crust thinning from the thicken crust, it is an important significance to understand the deep process for the lithospheric thinning of the North China Craton during the Mesozoic era.
- Late Jurassic,
- Lanqi Formation,
- trachyandesite,
- andesitic breccia lava,
- partial melting,
- Beipiao area,
- petrology,
- geochemistry

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References(53)

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Magma Evolution of the Late Jurassic Volcanic Rocks and Its Genesis of the Lanqi Formation, Beipiao Area, Western Liaoning Province

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