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Ultra-high temperature metamorphism recorded in Fe-rich olivine-bearing migmatite from the Khondalite Belt, North China Craton

文献类型：期刊论文

作者Lobjoie, Cyril1; Lin, Wei2; Trap, Pierre1; Goncalves, Philippe1; Li, Qiuli2; Marquer, Didier1; Bruguier, Olivier3; Devoir, Arnaud1
刊名JOURNAL OF METAMORPHIC GEOLOGY
出版日期2018-04-01
卷号36期号:3页码:343-368
关键词Khondalite Belt metamorphic olivine migmatites North China Craton ultra-high temperature metamorphism
ISSN号0263-4929
DOI10.1111/jmg.12295
文献子类Article
英文摘要We document the first occurrence of Fe-rich olivine-bearing migmatitic metapelite in the Khondalite Belt, North China Craton. Petrological analyses revealed two exotic assemblages of orthopyroxene+spinel+olivine and orthopyroxene+spinel+cordierite. Phase relation modelling suggests that these assemblages are diagnostic of ultra-high temperature (UHT) metamorphism in the Fe-rich system, with temperatures from 1,000 to 1,050 degrees C at 0.6GPa. U-Th-Pb SIMS analyses on zircon reveal a similar age of c. 1.92Ga for the olivine-bearing migmatite and an adjacent gabbronoritic intrusion that is therefore identified as the heat source for the UHT metamorphism. These results, coupled with additional analysis of the famous Tuguiwula sapphirine-bearing granulite, lead to a re-appraisal of the P-T path shape and heat source for the UHT metamorphism. We suggest that UHT metamorphism, dated between 1.92 and 1.88Ga, across the whole Khondalite belt, proceeded from a clockwise P-T evolution with an initial near-isobaric heating path at similar to 0.6-0.8 GPa, and a maximum temperature of 1,050 degrees C followed by a cooling path with minor decompression to similar to 0.5GPa. Considering our results and previous works, we propose that the orogenic crust underwent partial melting at temperature reaching 850 degrees C and depth of similar to 20 to similar to 30km during a period of c. 30Ma, between 1.93 and 1.90Ga. During this time span, the partially molten crust was continuously intruded by mafic magma pulses responsible for local greater heat supply and UHT metamorphism above 1,000 degrees C. We propose that the UHT metamorphism in the Khondalite belt is not related to an extensional post-collisional event, but is rather syn-orogenic and associated with mafic magma supplies.
WOS关键词P-T PATH ; MONGOLIA SUTURE ZONE ; CALCULATED PHASE-EQUILIBRIA ; U-PB ; WESTERN BLOCK ; INNER-MONGOLIA ; CRUSTAL METAMORPHISM ; TECTONIC EVOLUTION ; ORTHO-PYROXENE ; CONTACT-METAMORPHISM
WOS研究方向Geology
语种英语
WOS记录号WOS:000426512400004
出版者WILEY
资助机构NSFC(41225009 ; NSFC(41225009 ; CNRS INSU ; CNRS INSU ; 41472193 ; 41472193 ; 41202079) ; 41202079) ; NSFC(41225009 ; NSFC(41225009 ; CNRS INSU ; CNRS INSU ; 41472193 ; 41472193 ; 41202079) ; 41202079) ; NSFC(41225009 ; NSFC(41225009 ; CNRS INSU ; CNRS INSU ; 41472193 ; 41472193 ; 41202079) ; 41202079) ; NSFC(41225009 ; NSFC(41225009 ; CNRS INSU ; CNRS INSU ; 41472193 ; 41472193 ; 41202079) ; 41202079)
源URL[http://ir.iggcas.ac.cn/handle/132A11/82750]  
专题中国科学院地质与地球物理研究所
通讯作者Lobjoie, Cyril
作者单位1.Univ Bourgogne Franche Comte, UMR Chronoenvironm 6249, Besancon, France
2.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing, Peoples R China
3.Univ Montpellier, UMR Geosci Montpellier 5243, Montpellier, France
推荐引用方式
GB/T 7714		 Lobjoie, Cyril,Lin, Wei,Trap, Pierre,et al. Ultra-high temperature metamorphism recorded in Fe-rich olivine-bearing migmatite from the Khondalite Belt, North China Craton[J]. JOURNAL OF METAMORPHIC GEOLOGY,2018,36(3):343-368.
APA Lobjoie, Cyril.,Lin, Wei.,Trap, Pierre.,Goncalves, Philippe.,Li, Qiuli.,...&Devoir, Arnaud.(2018).Ultra-high temperature metamorphism recorded in Fe-rich olivine-bearing migmatite from the Khondalite Belt, North China Craton.JOURNAL OF METAMORPHIC GEOLOGY,36(3),343-368.
MLA Lobjoie, Cyril,et al."Ultra-high temperature metamorphism recorded in Fe-rich olivine-bearing migmatite from the Khondalite Belt, North China Craton".JOURNAL OF METAMORPHIC GEOLOGY 36.3(2018):343-368.

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来源：地质与地球物理研究所

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