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Petromagnetic properties of granulite-facies rocks from the northern North China Craton: Implications for magnetic and evolution of the continental lower crust

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Petromagnetic properties of granulite-facies rocks from the northern North China Craton: Implications for magnetic and evolution of the continental lower crust

Content Provider	Springer Nature Link
Author	Liu, Qingsheng Wang, Hongcai Zheng, Jianping Zeng, Qingli Liu, Qingsong
Copyright Year	2013
Abstract	This paper studies magnetic properties and composition of granulite-facies rocks of both the Neogene and Archean continental lower crust in the Neogene xenolith-bearing Hannuoba(汉诺坝) alkaline basalt and the exposed lower crustal section in the Archean Huai’an(淮安) terrain (Wayaokou (瓦窑口)-Manjinggou(蔓菁沟 profile), the northern North China Craton. It provides a unique opportunity for a comparative study of magnetic properties and composition of both the Archean and Neogene continental lower crust. We measure magnetic parameters (susceptibility κ and magnetic hysteresis parameters, such as saturation magnetization J $_{s}$, saturation isothermal remanent magnetization J $_{rs}$, and intrinsic coercivity H $_{c}$) of eleven Hannuoba lower crustal xenoliths and nine terrain granulites from the Archean Huai’an terrain. Results indicate that the average values of κ, J $_{s}$ and J $_{rs}$ of Archean granulites are 4 122×10$^{−6}$ SI, 523.1 A/m and 74.9 A/m, respectively, which are generally higher than those of granulite-facies xenoliths (1 657×10$^{−6}$ SI, 163.9 A/m and 41.9 A/m, respectively). These two types of granulites contain ilmenite, (titano) magnetite, minor hematite and some “magnetic silicates” (clinopyroxene, plagioclase and biotite). The Mg-rich ilmenite in granulite-facies xenolith is relatively higher than that in terrain granulites. We observe a more evolved character as higher magnetic as well as lower Sr/Nd, Cr/Nd, Ni/Nd, Co/Nd and V/Nd ratios in terrain granulites. These differences in magnetic characteristics reflect their different origins and evolutions. The high magnetization of granulites in the Huai’an terrain represents magnetic properties of the Archean continental lower crust, and low magnetization of granulite-facies xenoliths represents magnetic properties of the Cenozoic lower crusts in the northern North China Craton.
Starting Page	12
Ending Page	28
Page Count	17
File Format	PDF
ISSN	1674487X
Journal	Journal of Earth Science
Volume Number	24
Issue Number	1
e-ISSN	1867111X
Language	English
Publisher	China University of Geosciences
Publisher Date	2013-03-16
Publisher Place	China University of Geosciences
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	rock and mineral magnetism magnetic mineralogy and petrology metamorphic petrology North China Craton Earth Sciences Geotechnical Engineering & Applied Earth Sciences Biogeosciences Geochemistry Geology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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