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130 results on '"Zheng, Chang-Qing"'

16. Pan-African metamorphic and magmatic rocks of the Khanka Massif, NE China: further evidence regarding their affinity

Author

Zhou, Jian-Bo, Wilde, Simon A., Zhao, Guo-Chun, Zhang, Xing-Zhou, Zheng, Chang-Qing, Wang, Hu, and Zeng, Wei-Shun

Subjects
China -- Natural history, Rocks, Metamorphic -- Research, Rocks, Igneous -- Research, Neoproterozoic Era -- Research, Geology -- Research, Earth sciences
Abstract

The Khanka Massif is a crustal block located along the eastern margin of the Central Asian Orogenic Belt (CAOB) and bordered to the east by Late Jurassic-Early Cretaceous circum- Pacific accretionary complexes of the Eastern Asian continental margin. It consists of graphite-, sillimanite- and cordierite-bearing gneisses, carbonates and felsic paragneisses, in association with various orthogneisses. Metamorphic zircons from a sillimanite gneiss from the Hutou complex yield a weighted mean [sup.Pb]206pb/[238.sup.U] age of 490 [+ or -] 4 Ma, whereas detrital zircons from the same sample give ages from 934-610 Ma. Magmatic zircon cores in two garnet-bearing granite gneiss samples, also collected from the Hutou complex, yield weighted mean [sup.206][pb/.sup.Z38]U ages of 522 [+ or -] 5 Ma and 515 [+ or -] 8 Ma, whereas their metamorphic rims record [sup.206][pb/.sup.23]SU ages of 510 500 Ma. These data indicate that the Hutou complex in the Khanka Massif records early Palaeozoic magmatic and metamorphic events, identical in age to those in the Mashan Complex of the Jiamusi Massif to the west. The older zircon populations in the sillimanite gneiss indicate derivation from Neoproterozoic sources, as do similar rocks in the Jiamusi Massif. These data confirm that the Khanka Massif has a close affinity with other major components of the CAOB to the west of the Dun-Mi Fault. Based on these results and previously published data, the Khanka Massif is therefore confirmed as having formed a single crustal entity with the Jiamusi (and possibly the Bureya) massif since Neoproterozoic time. Keywords: SHRIMP U-Pb dating, Neoproterozoic, Late Pan-African, granulites, Khanka Massif. doi:10.1017/S0016756810000063

Published
2010

18. Detrital zircon U-Pb dating of low-grade metamorphic rocks in the Sulu UHP belt: evidence for overthrusting of the North China Craton onto the South China Craton during continental subduction

Author

Zhou, Jian-Bo, Wilde, Simon A., Zhao, Guo-Chun, Zheng, Chang-Qing, Jin, Wei, Zhang, Xing-Zhou, and Cheng, Hong

Subjects
China -- Natural history, Uranium-lead dating -- Methods, Rocks, Metamorphic -- Properties, Cratons -- Structure, Subduction zones (Geology) -- Observations, Earth sciences
Abstract

The Shiqiao-Pingshang low-grade metasedimentary rocks sporadically crop out in the Sulu ultrahigh-pressure (UHP) belt in east-central China. Major and trace element data indicate that they were deposited in a passive margin basin, probably located at the southern margin of the North China Craton. Sensitive high-resolution ion microprobe (SHRIMP) U-Pb dating of detrital zircons from a quartzite (SD53) from Pingshang and a quartz schist (SD54) from Shiqiao records ages ranging from 2800 to 1900 Ma. Three age populations are defined: at 2660-2500, 2350-2150 and 2100-1900 Ma, with peak ages at 2522, 2212 and 2020 Ma, respectively. Muscovite Ar-Ar dating of the quartz schist (SD54) yields a plateau age of 265.9 [+ or -] 1.2 Ma. These data support the view that the Shiqiao-Pingshang low-grade metasedimentary rocks originated from the North China Craton, and underwent deformation in the Permian during subduction of the South China Craton (Yangtze block) beneath the North China Craton. This requires that the low-grade metasedimentary rocks were overthrust for several tens of kilometres onto the South China Craton, explaining why source materials from the North China Craton are common in Triassic to Jurassic sedimentary basins adjacent to the Dabie-Sulu orogenic belt.

Published
2008

28. Correlation between Serum Levels of High Mobility Group Box-1 Protein and Pancreatitis: A Meta-Analysis

Author

Lin, Yan, Lin, Lian-Jie, Jin, Yu, Cao, Yong, Zhang, Ying, Zheng, Chang-Qing, Liu, Jia-Li, and Yang, Sheng-Li

Subjects
Article Subject, chemical and pharmacologic phenomena
Abstract

Background. Aberrant expression of high mobility group box-1 protein (HMGB1) contributes to the progression of various inflammatory diseases. This meta-analysis focused on the clinical significance of serum HMGB1 levels in pancreatitis patients, with the goal of building a novel diagnostic score model. Method. We conducted a meta-analysis by searching in the PubMed, Embase, Web of Science, Cochrane Library, CISCOM, CINAHL, Google Scholar, China BioMedicine (CBM), and China National Knowledge Infrastructure (CNKI) databases without any language restrictions. Studies were pooled and standard mean difference (SMD) and its corresponding 95% confidence intervals (95% CIs) were calculated. Version 12.0 STATA software was used for statistical analysis. Results. We performed a final analysis of 841 subjects from 12 clinical case-control studies. The meta-analysis results showed a positive association between serum HMGB1 levels and the progression of pancreatitis. In the subgroup analysis by country, high serum level of HMGB1 may be related to pancreatitis progression in China, Korea, Hungary, and Japan populations (all P

Published
2015
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