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Study on peak metamorphism conditions and zircons U-Pb chronology in the "low-grade metamorphism" belt: Foziling Group, Beihuaiyang metamorphic unit
Zhao JunXian1; Shi YongHong1; Tang Hu2,3; Li QiuLi2,3; Hou ZhenHui4; Zhou Tian2,3
2019
Source PublicationACTA PETROLOGICA SINICA
ISSN1000-0569
Volume35Issue:7Pages:2219-2236
AbstractThe Foziling Group (FZG) is an important component of the Beihuaiyang metamorphic unit in the northernmost margin of the Dabie collisional orogenic belt, and is located in the crucial position between the Yangtze and North China plates. For a long time, the FZG has been regarded as the sedimentary product of the northern margin of the Yangtze Plate as an accretionary wedge. However, the disputes on the tectonic attribute and dynamic formation mechanism of the FZG are incessancy due to the different viewpoints from studies of its geochronology and structural geology. The reason for this situation lies on the lack of the accurate appraise for the metamorphic attribution of the FZG. In this study, detailed fieldworks and regional metamorphic investigations on the FZG, together with abundant analysis of its metamorphic petrology, thermodynamic characteristics and geochronological dating have been carried out. The result indicates that the FZG is mainly lithologically composed of fine-grained mica-quartz schists, quartz-mica schists and garnet mica schists. The estimates of the main metamorphic P-T conditions of the FZG show that it has metamorphosed in a middle-high pressure amphibolite facies with a P-T range of 610 similar to 620 degrees C and 0. 9 similar to 1. 0GPa, respectively, and it should not be the lower'-grade metamorphic unit. which demonstrates that the FZG might be involved into the process of subduction and exhumation in the deeper level. On the basis of zircon U-Pb dating, a large age range of 3101 +/- 48Ma similar to 413 +/- 9Ma has been gained for the FZG, which can be divided into 5 groups with the peak age values of 2537Ma, 1567Ma, 940Ma, 749Ma and 440Ma, respectively. These peak ages imply that the FZG has a mixture source from North China and Yangtze plates, and the youngest peak age suggests that the FZG has been formed in late Early Paleozoic.
KeywordFoziling Group P-T conditions Garnet mica schist Zircon U-Pb dating
DOI10.18654/1000-0569/2019.07.17
WOS KeywordDABIE MOUNTAINS ; SOUTH CHINA ; CONTINENTAL-CRUST ; YANGTZE CRATON ; OROGENIC BELT ; SM-ND ; ROCKS ; ECLOGITES ; EVOLUTION ; NORTH
Language英语
WOS Research AreaGeology
WOS SubjectGeology
WOS IDWOS:000491151100017
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/93886
Collection中国科学院地质与地球物理研究所
Corresponding AuthorShi YongHong
Affiliation1.Hefei Univ Technol, Coll Resources & Environm Engn, Hefei 230009, Anhui, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.Univ Sci & Technol China, Hefei 230009, Anhui, Peoples R China
Recommended Citation
GB/T 7714
Zhao JunXian,Shi YongHong,Tang Hu,et al. Study on peak metamorphism conditions and zircons U-Pb chronology in the "low-grade metamorphism" belt: Foziling Group, Beihuaiyang metamorphic unit[J]. ACTA PETROLOGICA SINICA,2019,35(7):2219-2236.
APA Zhao JunXian,Shi YongHong,Tang Hu,Li QiuLi,Hou ZhenHui,&Zhou Tian.(2019).Study on peak metamorphism conditions and zircons U-Pb chronology in the "low-grade metamorphism" belt: Foziling Group, Beihuaiyang metamorphic unit.ACTA PETROLOGICA SINICA,35(7),2219-2236.
MLA Zhao JunXian,et al."Study on peak metamorphism conditions and zircons U-Pb chronology in the "low-grade metamorphism" belt: Foziling Group, Beihuaiyang metamorphic unit".ACTA PETROLOGICA SINICA 35.7(2019):2219-2236.
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