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Relics of a Paleoproterozoic orogen: New petrological, phase equilibria and geochronological studies on high-pressure pelitic granulites from the Pingdu-Laiyang areas, southwest of the Jiaobei terrane, North China Craton
Zou, Yi1,2,3; Zhai, Mingguo2,3; Zhou, Ligang1; Zhao, Lei1; Lu, Junsheng4; Wang, Yuquan1,2; Shan, Houxiang1
2019-03-01
Source PublicationPRECAMBRIAN RESEARCH
ISSN0301-9268
Volume322Pages:136-159
AbstractHigh-pressure (HP) pelitic granulites have been used as important targets in evaluating ancient geodynamic processes similar to subduction, collision and exhumation operating in modern plate tectonics. In this contribution, relic HP pelitic granulites were identified from the Pingdu-Laiyang areas of the Jiaobei terrane that are dominated by low- to medium-pressure (LMP) pelitic granulites, suggesting their linear distribution and that at least some of LMP types should be retrograde products of the HP pelitic granulites. Their metamorphic P-T-t paths were traced by integrated methods of petrographic observation, mineral chemistry, P-T-X pseudosection modeling, Zr-in-rutile thermometry, and zircon and monazite geochronology. These HP pelitic granulites record consistent clockwise P-T-t paths that are manifested by similar peak metamorphism of high-pressure granulite-facies, with P-T conditions of P > 13 kbar, T > 850 degrees C possibly during 1950-1900 Ma, followed by near isothermal decompression (ITD) to mid-crustal level at 1900-1850 Ma and subsequent near isobaric cooling (IBC) to low temperature during 1850-1800 Ma. The consistent clockwise P-T-t paths and linear distribution of HP pelitic granulites explicitly indicate a sequence of geodynamic processes similar to modern-style plate tectonics must have operated during formation of the Paleoproterozoic Jiao-Liao-Ji belt (JLJB). These include a process similar to subduction that brought sedimentary precursors of HP pelitic granulites down, which was followed by continental orogeny during 1950-1900 Ma, leading to crustal thickening (40-50 km) and high-pressure granulite-facies metamorphism, and a post-orogenic collapse during 1900-1800 Ma that resulted in exhumation and cooling of HP granulites along ITD and IBC paths. Therefore, it is argued that ancient HP pelitic granulites can be regarded as relics of orogen and ascertain tectonic interpretation of the dominated LMP pelitic granulites in the same Precambrian metamorphic terranes. Notably, the apparent thermal gradients estimated from peak metamorphism are 15-20 degrees C/km, much higher than those of typical products in Phanerozoic plate tectonics, and the HP pelitic granulites that contain well-preserved kyanite probably require relatively high exhumation rates during ITD to middle crustal level. These seem to mark the differences in thermal regimes and tectonic mechanisms between Paleoproterozoic and Phanerozoic collisional orogenic systems.
KeywordHigh-pressure pelitic granulites Pingdu-Laiyang areas Jiao-Liao-Ji belt P-T-X pseudosections P-T-t path
DOI10.1016/j.precamres.2018.12.011
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordLIAO-JI BELT ; U-PB ZIRCON ; LU-HF ISOTOPES ; TEMPERATURE TIME PATHS ; META-MAFIC ROCKS ; CRUSTAL EVOLUTION ; METAMORPHIC EVENTS ; T PATH ; EASTERN BLOCK ; TECTONIC IMPLICATIONS
Language英语
Funding ProjectNational Natural Science Foundation of China[41572176] ; National Natural Science Foundation of China[41530208] ; National Natural Science Foundation of China[41890834] ; [2015M571115]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000458712700009
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90672
Collection岩石圈演化国家重点实验室
Corresponding AuthorZhai, Mingguo
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Univ Chinese Acad Sci, Key Lab Computat Geodynam, Beijing 100049, Peoples R China
4.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
Recommended Citation
GB/T 7714
Zou, Yi,Zhai, Mingguo,Zhou, Ligang,et al. Relics of a Paleoproterozoic orogen: New petrological, phase equilibria and geochronological studies on high-pressure pelitic granulites from the Pingdu-Laiyang areas, southwest of the Jiaobei terrane, North China Craton[J]. PRECAMBRIAN RESEARCH,2019,322:136-159.
APA Zou, Yi.,Zhai, Mingguo.,Zhou, Ligang.,Zhao, Lei.,Lu, Junsheng.,...&Shan, Houxiang.(2019).Relics of a Paleoproterozoic orogen: New petrological, phase equilibria and geochronological studies on high-pressure pelitic granulites from the Pingdu-Laiyang areas, southwest of the Jiaobei terrane, North China Craton.PRECAMBRIAN RESEARCH,322,136-159.
MLA Zou, Yi,et al."Relics of a Paleoproterozoic orogen: New petrological, phase equilibria and geochronological studies on high-pressure pelitic granulites from the Pingdu-Laiyang areas, southwest of the Jiaobei terrane, North China Craton".PRECAMBRIAN RESEARCH 322(2019):136-159.
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