PERMIAN RADIOLARIAN FAUNAS FROM CHERT IN THE KHABAROVSK COMPLEX, FAR EAST RUSSIA, AND THE AGE OF EACH LITHOLOGIC UNIT OF THE KHABAROVSK COMPLEX

The Khabarovsk Complex, a Jurassic accretionary complex distributed in and around the Khabarovsk city area, Far East Russia, comprises mélange and schist facies. From the review of previous studies including Russian papers, the lithology and age of the constituent rocks of the mélange facies can be...

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Published in:Journal of paleontology 2005-07, Vol.79 (4), p.687-701
Main Authors: SUZUKI, NORITOSHI, KOJIMA, SATORU, KANO, HARUMASA, YAMAKITA, SATOSHI, MISAKI, AKIHIRO, EHIRO, MASAYUKI, OTOH, SHIGERU, KURIHARA, TOSHIYUKI, AOYAMA, MASASHI
Format: Article
Language:English
Subjects:
Albaillella
Albaillella asymmetrica
Asia
assemblages
biostratigraphy
Carboniferous
Commonwealth of Independent States
correlation
depositional environment
Earth sciences
Far East
Follicucullus
Fossils
Geological facies
Geology
Invertebrata
invertebrate
Japan
Jurassic
Khabarovsk Complex
Khabarovsk Russian Federation
Limestones
Lithology
lithostratigraphy
Lomentaria
marine environment
melange
Mesozoic
microfossils
Micropaleontology
Monacanthus
morphology
Mudstone
Nabis
Paleontology
Paleozoic
Permian
Prefectures
Protista
Pseudoalbaillella
Radiolaria
Rocks
Russian Federation
SEM data
Stratigraphy
taxonomy
Tectonics
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Summary:The Khabarovsk Complex, a Jurassic accretionary complex distributed in and around the Khabarovsk city area, Far East Russia, comprises mélange and schist facies. From the review of previous studies including Russian papers, the lithology and age of the constituent rocks of the mélange facies can be summarized as follows: Upper Paleozoic basic volcanic rocks, mainly pillow lava, and altered gabbro, Upper Carboniferous to Upper Permian fusulinoidean-bearing limestone associated with tuff, Lower and Middle Jurassic siliceous mudstone, Upper Jurassic tuffaceous mudstone, uppermost Jurassic carbonate concretions embedded in mudstone, and age-unknown sandstone. Newly found sequences of limestone-chert and of basalt-chert in the mélange facies crop out along the Amur River in the Khabarovsk city area. A chert sample of the limestone-chert sequence contains Albaillella aff. asymmetrica and Pseudoalbaillella aff. lomentaria, and a chert sample of the basalt-chert sequence includes Follicucullus monacanthus, Follicucullus porrectus, and Pseudoalbaillella cf. yanaharaensis. The radiolarian assemblages from the limestone-chert and basalt-chert sequences have a maximum age of middle Early Permian and late Middle Permian, respectively, overlapping the time of deposition of the fusulinoidean-bearing limestone. The co-occurrence of chert and limestone indicates that the fusulinoidean-bearing limestone was formed on a basaltic topographic high in a pelagic ocean whereas the radiolarians accumulated in a deeper part. Limestone debris occasionally flowed into the depositional site of the radiolarian chert. Although the Khabarovsk Complex was simply considered as a northern extension of the Mino-Tamba Belt of the Inner Zone of southwest Japan, we propose a new correlation based on the lithologic associations. The mélange facies of the Khabarovsk Complex is correlative with one of the Kasugano, Funabuseyama, Nabi, and Yabuhara Formations in the Mino-Tamba Belt, whereas the schist facies is correlative with the Hikami Formation of the Ultra-Tamba Belt.
ISSN:0022-3360
1937-2337
DOI:10.1666/0022-3360(2005)079[0687:PRFFCI]2.0.CO;2