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Cambrian and earliest Ordovician fauna and geology of the Sông Đà and adjacent terranes in Việt Nam (Vietnam)

Published online by Cambridge University Press:  27 September 2021

Nigel C. Hughes Open the ORCID record for Nigel C. Hughes [Opens in a new window] ,
Shanchi Peng ,
David A. T. Harper Open the ORCID record for David A. T. Harper [Opens in a new window] ,
Paul M. Myrow ,
Ngân Kim Phạm ,
Shelly J. Wernette Open the ORCID record for Shelly J. Wernette [Opens in a new window]  and
Xuejian Zhu
Nigel C. Hughes*
Affiliation:
Department of Earth and Planetary Sciences, University of California, Riverside, CA92521, USA Geological Studies Unit, Indian Statistical Institute, 203 B.T. Road, Kolkata, 700108, India
Shanchi Peng
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences), Nanjing210008, China
David A. T. Harper
Affiliation:
Palaeoecosystems Group, Department of Earth Sciences, Durham University, DurhamDH1 3LE, UK
Paul M. Myrow
Affiliation:
Department of Geology, Colorado College, Colorado Springs, CO80903, USA
Ngân Kim Phạm
Affiliation:
Việt Nam Research Institute of Geosciences and Mineral Resources, 67 Chiến Thắng Road, Văn Quán, Hà Đông, Hà Nội, Việt Nam
Shelly J. Wernette
Affiliation:
Department of Earth and Planetary Sciences, University of California, Riverside, CA92521, USA
Xuejian Zhu
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences), Nanjing210008, China
*
Author for correspondence: Nigel C. Hughes, Email: [email protected]
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Abstract

Later Cambrian and earliest Ordovician trilobites and brachiopods spanning eight horizons from five localities within the Sông Mã, Hàm Rồng and Đông Sơn formations of the Thanh Hóa province of Việt Nam, constrain the age and faunal affinities of rocks within the Sông Đà terrane, one of several suture/fault-bounded units situated between South China to the north and Indochina to the south. ‘Ghost-like’ preservation in dolomite coupled with tectonic deformation leaves many of the fossils poorly preserved, and poor exposure precludes collecting within continuously exposed stratigraphic successions. Cambrian carbonate facies pass conformably into Lower Ordovician carbonate-rich strata that also include minor siliciclastic facies, and the recovered fauna spans several uppermost Cambrian and Lower Ordovician biozones. The fauna is of equatorial Gondwanan affinity, and comparable to that from South China, North China, Sibumasu and Australia. A new species of Miaolingian ‘ptychopariid’ trilobite, Kaotaia xuanensis, is described. Detrital zircon samples from Cambrian–Ordovician rocks of the North Việt Nam and Sông Đà terranes, and from Palaeozoic samples from the Trường Sơn sector of Indochina immediately to the south, contain a predominance of ages spanning the Neoproterozoic period and have a typical equatorial Gondwanan signature. We associate the Cambrian and Tremadocian of the Sông Đà terrane with areas immediately to the north of it, including the North Việt Nam terrane and the southern parts of Yunnan and Guangxi provinces of China.

Keywords

Cambriantrilobitebrachiopodpalaeogeographygeochronologydetrital zircon
Type
Original Article
Information
Geological Magazine , Volume 159 , Issue 1 , January 2022 , pp. 55 - 80
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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