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Middle Permian radiolarians from Anmenkou, Chaohu, Northeastern Yangtze platform, China

Middle Permian radiolarians from Anmenkou, Chaohu, Northeastern Yangtze platform, China The biostratigraphy of the Middle Permian Gufeng Formation in the northeastern Yangtze platform is examined based on radiolarians. This study is concentrated on the Anmenkou section in the Chaohu area of Anhui Province, China. The Gufeng Formation is divided into the Phosphate Nodule‐bearing Mudstone Member (PNMM) and the Siliceous Rock Member (SRM) in ascending order. The former primarily consists of mudstone including abundant phosphate nodules, and the latter consists mainly of alternating beds of chert, siliceous mudstone and mudstone, with intercalations of porous chert. Ammonoids in the mudstone of the lower PNMM are Wordian. Chert, siliceous mudstone and mudstone of the SRM include abundant radiolarians with sponge spicule assemblages suggestive of the Wordian–Capitanian. Albaillellaria are predominant in the lower SRM, while Entactinaria and Spumellaria are predominant in the middle and upper SRM. These radiolarians correspond to three radiolarian assemblage zones: Pseudoalbaillella longtanensis–Pseudoalbaillella fusiformis, Follicucullus monacanthus, and Follicucullus scholasticus–Ruzhencevispongus uralicus. The assemblage of radiolarians and sponge spicule fauna suggests a depositional depth of 150–500 m. The radiolarian fauna of the Gufeng Formation is considered to be representative of the relatively shallow, tropical radiolarian fauna of the Middle Permian eastern Paleotethys. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Island Arc Wiley

Middle Permian radiolarians from Anmenkou, Chaohu, Northeastern Yangtze platform, China

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References (64)

Publisher
Wiley
Copyright
© 2009 The Authors. Journal compilation © 2009 Blackwell Publishing Asia Pty Ltd
ISSN
1038-4871
eISSN
1440-1738
DOI
10.1111/j.1440-1738.2008.00649.x
Publisher site
See Article on Publisher Site

Abstract

The biostratigraphy of the Middle Permian Gufeng Formation in the northeastern Yangtze platform is examined based on radiolarians. This study is concentrated on the Anmenkou section in the Chaohu area of Anhui Province, China. The Gufeng Formation is divided into the Phosphate Nodule‐bearing Mudstone Member (PNMM) and the Siliceous Rock Member (SRM) in ascending order. The former primarily consists of mudstone including abundant phosphate nodules, and the latter consists mainly of alternating beds of chert, siliceous mudstone and mudstone, with intercalations of porous chert. Ammonoids in the mudstone of the lower PNMM are Wordian. Chert, siliceous mudstone and mudstone of the SRM include abundant radiolarians with sponge spicule assemblages suggestive of the Wordian–Capitanian. Albaillellaria are predominant in the lower SRM, while Entactinaria and Spumellaria are predominant in the middle and upper SRM. These radiolarians correspond to three radiolarian assemblage zones: Pseudoalbaillella longtanensis–Pseudoalbaillella fusiformis, Follicucullus monacanthus, and Follicucullus scholasticus–Ruzhencevispongus uralicus. The assemblage of radiolarians and sponge spicule fauna suggests a depositional depth of 150–500 m. The radiolarian fauna of the Gufeng Formation is considered to be representative of the relatively shallow, tropical radiolarian fauna of the Middle Permian eastern Paleotethys.

Journal

Island ArcWiley

Published: Mar 1, 2009

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