辽西晚古生代长茂河子辉绿岩墙群的地球化学特征

李伍平; 李献华

Volume 30 Issue 6

Jun. 2005

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LI Wu-ping, LI Xian-hua, 2005. Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China. Earth Science, 30(6): 761-770.

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LI Wu-ping, LI Xian-hua, 2005. Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China. Earth Science, 30(6): 761-770.

LI Wu-ping, LI Xian-hua, 2005. Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China. Earth Science, 30(6): 761-770.

Citation:

LI Wu-ping, LI Xian-hua, 2005. Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China. Earth Science, 30(6): 761-770.

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Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China

LI Wu-ping^{1, 2
,},
LI Xian-hua²

1.
School of Civil Engineering , Guangzhou University , Guangzhou 510405, China
2.
Guangzhou Institute of Geochemistry , Chinese Academy of Sciences, Guangzhou 510640, China

Received Date: 2005-08-08
Publish Date: 2005-11-25

Abstract

Abstract

Based on K-Ar isotopic ages (287.5-243.6 Ma), diabase dyke swarms of the Changmaohezi from western Liaoning, Northeast China, formed in the Late Paleozoic. These diabases can be divided into low Ti-Fe diabase and high Ti-Fe diabase. The low Ti-Fe diabases are characterized by low TiO₂ (< 2%), FeO_t (12.39%-15.33%), V (227-335 μg/g), Sc (24-36 μg/g) and high SiO₂ (45.61%-47.72%), Al₂O₃ (12.51%-16.71%), MgO (6.66%-9.31%), K₂O (0.57%-2.39%), Cr (107-177 μg/g), Ni (96-235 μg/g), and low Ti/Y (327-496), Ti/Zr (69-114), which are similar to continental flood basalts. The high Ti-Fe diabases are characterized by high TiO₂ (5%-6%), FeO_t (22.13%-22.16%), V(850-859 μg/g), Sc (51-52 μg/g), and low SiO₂ (42.88%-44.90%), Al₂O₃ (11.53%-11.57%), MgO (5.15%- 5.29%), K₂O (0.48%-0.51%), Cr (< 2 μg/g), Ni (< 30 μg/g), and high Ti/Y (1 046-1 106), Ti/Zr (250-263), which are similar to the Skaergaard intrusion. All these rocks are enriched in Rb, Th, U, Pb, Ti, and light REE, and depleted in Ba, Sr, P, Nb and Ta. They have well-evolved Nd and Sr isotope compositions with ε_Nd(t) =-6.43 to -4.12 and ε_Sr(t) =42.94-64.19. The diabases were probably derived from the enriched lithospheric mantle and underwent fractional crystallization and crust assimilation. The high Ti-Fe diabases and the low Ti-Fe diabases are from different crystal conditions, the former in a closed system or a relatively oxidized state.
- low Ti-Fe diabase,
- lithosphere mantle,
- Late Paleozoic,
- Changmaohezi,
- western Liaoning Province

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References(53)

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Geochemical Characteristics of the Late Paleozoic Diabase Dyke Swarms of Chang maohezi from Western Liaoning, Northeast China

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