Isotopic ages of the Penglai Group in the Jiaobei Belt and their geotectonic implications

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Authors:Zhu Guang; Xu Jiawei; Fitches, W. R.; Fletcher, C. J. N.
Author Affiliations:Primary:
Hefei University of Technology, Department of Geology, Hefei, China
University College of Wales, United Kingdom
British Geological Survey, United Kingdom
Volume Title:Acta Geologica Sinica (English Edition)
Source:Acta Geologica Sinica (English Edition), 7(4), p.417-433. Publisher: Pergamon, Oxford, United Kingdom. ISSN: 1000-9515
Publication Date:1994
Note:In English. 46 refs.; illus., incl. 2 tables, geol. sketch maps
Summary:The Penglai group of metasediments is the only remaining cover of the Archaean to early Proterozoic crystalline basement in E Shandong. Whole-rock Rb-Sr, illite-whole-rock Rb-Sr and illite K-Ar ages are reported and interpreted. On the basis of structural and metamorphic studies coupled with analyses of illite crystallinity, a whole-rock age of 473 ± 32 m.y. (Ordovician) is interpreted as the time of the end of burial metamorphism experienced by the group, i.e. the Penglai group is pre-Ordovician. The first-phase folding and syntectonic low greenschist-facies metamorphism took place before 299 ± 4 m.y., i.e. in the late Carboniferous. The Penglai movement that occurred in the Jiaobei Belt on the S margin of the North China plate is attributed to collision between the North China and Yangtze plates along the Jiaonan collision belt. [R.A.H.]
Subjects:Absolute age; Burial metamorphism; Crystallinity; Dates; Geochronology; Illite; K/Ar; Metamorphic rocks; Metamorphism; Ordovician; Paleozoic; Plate collision; Plate tectonics; Rb/Sr; SEM data; Sheet silicates; Silicates; Slates; Whole rock; X-ray diffraction data; Asia; China; Far East; North China Platform; Shandong China; Shandong Peninsula; Yangtze Platform; Jiaobei Belt; Penglai Group
Coordinates:N360000 N375500 E1224000 E1200000
Abstract Numbers:95M/3817
Record ID:1996031278
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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