中国大陆科学钻探主孔高铁钛榴辉岩的磁性岩石学

曾庆理; 刘庆生; 邱宁

Volume 34 Issue 6

Jun. 2009

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CENG Qing-li, LIU Qing-sheng, QIU Ning, 2009. Magnetic Petrology of the High Fe-Ti Eclogite from the Chinese Continental Scientific Drilling(CCSD) Main Hole. Earth Science, 34(6): 993-1000.

Citation:

CENG Qing-li, LIU Qing-sheng, QIU Ning, 2009. Magnetic Petrology of the High Fe-Ti Eclogite from the Chinese Continental Scientific Drilling(CCSD) Main Hole. Earth Science, 34(6): 993-1000.

CENG Qing-li, LIU Qing-sheng, QIU Ning, 2009. Magnetic Petrology of the High Fe-Ti Eclogite from the Chinese Continental Scientific Drilling(CCSD) Main Hole. Earth Science, 34(6): 993-1000.

Citation:

CENG Qing-li, LIU Qing-sheng, QIU Ning, 2009. Magnetic Petrology of the High Fe-Ti Eclogite from the Chinese Continental Scientific Drilling(CCSD) Main Hole. Earth Science, 34(6): 993-1000.

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Magnetic Petrology of the High Fe-Ti Eclogite from the Chinese Continental Scientific Drilling(CCSD) Main Hole

Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China

Received Date: 2009-06-23
Publish Date: 2009-11-25

Abstract

Abstract

The high Fe-Ti eclogites appear at the depth intervals from 318-380m (A), 420-470m (B) and 530-600m (C) respectivelys in the Chinese Continental Scientific Drilling (CCSD) Project main hole. They have high FeO_T (total Fe) abundances of average 15.36%, 14.09% and 20.83%, high TiO₂ concentration of average 3.89%, 3.28% and 4.10% and low SiO₂ contents of average 44.64%, 48.64% and 41.10%, respectively. Magnetic study of the samples shows that section A has the lowest susceptibility (average 3.61×10^-7m³·kg^-1), NRM (average 0.12×10^-3Am²·kg^-1) and Q-value (average 8.03); section B has the highest susceptibility (average 12.55×10^-7m³·kg^-1), medium NRM (average 1.47×10^-3Am²·kg^-1) and Q-value (average 26.42); section C samples has medium susceptibility (average 9.73×10^-7m³·kg^-1) and the highest NRM (average 10.05×10^-3Am²·kg^-1) and Q-value (average 138.571). The magnetic property compared with metamorphic petrology of high Fe-Ti eclogites suggests that section A samples represent magnetic properties of the fresh or slightly retrograded eclogites; section B samples show higher metamorphic retrogression than those of section A; section C samples are fresh eclogite, whose density and oxygen fugacity are distinctly higher than those of A and B, containing a lot of hematite-ilmenite lamellar textures formed during the slowly exhumation, which can be the main contributors to the high NRM of the section C eclogite.
- high Fe-Ti eclogite,
- CCSD main hole,
- rock magnetic,
- hematite-ilmenite solid solution,
- susceptibility

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References(29)

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