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U-Pb ages and Hf isotopes of detrital zircons from pre-Devonian sequences along the southeast Yangtze; a link to the final assembly of East Gondwana

Ma Xiao, Yang Kunguang and Ali Polat
U-Pb ages and Hf isotopes of detrital zircons from pre-Devonian sequences along the southeast Yangtze; a link to the final assembly of East Gondwana
Geological Magazine (June 2019) 156 (6): 950-968

Abstract

The Early Palaeozoic geology of the South China Craton (SCC) is characterized by an Early Palaeozoic intracontinental orogen with folded pre-Devonian strata and migmatites, MP/MT metamorphic rocks and Silurian post-orogenic peraluminous magmatic rocks in both the Yangtze and the Cathaysia blocks. In this contribution, we present new zircon U-Pb ages and Hf isotope data for detrital zircons from the Neoproterozoic to Silurian sedimentary sequences in the southeastern Yangtze Block. Samples from Neoproterozoic rocks generally display a major peak at 900-560 Ma, whereas samples from Lower Palaeozoic rocks are characterized by several broader peaks within the age ranges 600-410 Ma, 1100-780 Ma, 1.6-1.2 Ga and 2.8-2.5 Ga. Provenance analysis indicates that the 900-630 Ma detritus in Cryogenian to Ediacaran samples was derived from the Late Neoproterozoic igneous rocks in South China that acted as an internal source. The occurrence of 620-560 Ma detritus indicates the SE Yangtze was associated with Late Neoproterozoic arc volcanism along the north margin of East Gondwana. The change of provenance resulted in the deposition of 550-520 Ma and 1.1-0.9 Ga detrital zircons in the Cambrian-Ordovician sedimentary rocks. The epsilon Hf(t) values of these detrital zircons are similar to those of zircons from NW Australia-Antarctica and South India. This change of provenance in the Cambrian can be attributed to the intracontinental subduction between South China and South Qiangtang, and the convergence of India and Australia when East Gondwana finally amalgamated.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 156
Serial Issue: 6
Title: U-Pb ages and Hf isotopes of detrital zircons from pre-Devonian sequences along the southeast Yangtze; a link to the final assembly of East Gondwana
Affiliation: China University of Geosciences, School of Earth Sciences, Wuhan, China
Pages: 950-968
Published: 201906
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 145
Accession Number: 2019-062048
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., geol. sketch maps
N25°45'00" - N26°00'00", E110°00'00" - E110°30'00"
N26°30'00" - N26°40'00", E110°00'00" - E110°30'00"
N25°30'00" - N25°40'00", E109°15'00" - E109°30'00"
Secondary Affiliation: University of Windsor, CAN, Canada
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201915
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