The Ordovician system in the Xainza region, north Tibet

Zhang, Yichun, Cheng, Liren and Zhang, Yujie 2004, The Ordovician system in the Xainza region, north Tibet, Journal of Jilin University : earth science edition, vol. 34, no. 4, pp. 502-508.

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Title The Ordovician system in the Xainza region, north Tibet
Author(s) Zhang, Yichun
Cheng, Liren
Zhang, Yujie
Journal name Journal of Jilin University : earth science edition
Volume number 34
Issue number 4
Start page 502
End page 508
Total pages 7
Publisher Jilin University
Place of publication Changchun, China
Publication date 2004-10
ISSN 1671-5888
Keyword(s) Xainza region north of Tibet
Ordovician system
Summary Lithostratigraphy, biostratigraphy of the Ordovician Xainza area, northern division and correlation divided of approximates of the early as of Ordovician of Tetragraptus (Paratetragraptus)-Didymograptus (Corymbograptus) deflexus combination of Middle Ordovician Michelinoceras elongatum- combination with Sinoceras chinese and the Late Ordovician Michelinoceras huangnigang-Columenoceras priscum combination band. Early Ordovician strata author from 2000 to 2001 making Xainza County Sheet 1:250000 regional geological survey newly discovered, is the oldest strata of reliable fossils based in northern Tibet. Especially Tetragraptus (Paratetragraptus) approximatus discovery, not only to expand the distribution of it in our geographic area Early Ordovician strata the similar stratigraphic correlation international biological basis.

The paper deals with the classification and correlation of lithostratigraphy and biostratigraphy of the Ordovician System in the Xainza region, North Tibet. Based on fossils, the Ordovician System is divided into several biozones as follows: Tetragraptus (Paratetragraptus) approximatus Didymograptus (Corymbograptus) deflexus graptolite assemblage of Early Ordovician, The sediments of Early Ordovician is discovered recently by authors during 2000~2001 when making the geological surveying 1:250000 scale of Xainza county, Which has been the oldest stratum based on fossils up to now in northern Tibet. What is more, the discovery of Tetragraptus (Paratetragraptus) approximatus enlarges its geographical distribution in our nation as well as provides biology evidence to international correlation of the Ordovician in Xainza county.
Notes (in Chinese with English abstract)
Language chi
Field of Research 049999 Earth Sciences not elsewhere classified
Socio Economic Objective 970104 Expanding Knowledge in the Earth Sciences
HERDC Research category C3.1 Non-refereed articles in a professional journal
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