File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Provenance study for the Paleozoic sedimentary rocks from the west Yangtze Block: Constraint on possible link of South China to the Gondwana supercontinent reconstruction

TitleProvenance study for the Paleozoic sedimentary rocks from the west Yangtze Block: Constraint on possible link of South China to the Gondwana supercontinent reconstruction
Authors
KeywordsDetrital zircon
Gondwana
Provenance
West South China
Yangtze Block
Issue Date2017
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres
Citation
Precambrian Research, 2017, v. 309, p. 271-289 How to Cite?
AbstractThe early Paleozoic and Devonian sedimentary rocks in the western part of the Yangtze Block were suggested to be derived from an exotic source that was once connected to South China. This conclusion was mainly based on that detrital zircons from these rocks give U-Pb age populations of 2400–2600 Ma, 1750–1850 Ma, 900–1000 Ma, 750–870 Ma and 500–680 Ma, but corresponding magmatic rocks of such late Archean, Grenvillian and latest Neoproterozoic-Cambrian ages do not outcrop in this area or adjacent regions. Zircons from the Cambrian sedimentary rocks of this study show the youngest age peak at ca. 550 Ma, and these zircons are mostly euhedral with positive eHf(t) values of +0.6 to +7.4. Because the unconformity between the Cambrian and Ordovician is evident in both west and south sides of South China, which is synchronous with its counterpart along the northern margin of the East Gondwana blocks (e.g. Himalaya region, Qiangtang, Western Australia), it is possible that these zircons were likely derived from a late Neoproterozoic-early Cambrian accretionary orogen (e.g. Bhimphedian orogeny) associated with the initial subduction of a proto-Tethys ocean beneath the margins of Gondwana continents. In contrast, the 500–680 Ma zircon population of the Silurian-Devonian sedimentary rocks give an older age peak at ca. 650 Ma and their eHf(t) values for the <540 Ma grains are all negative ( 27.8 to 0.3). These detrital zircons are rounded and could be possibly sourced from ‘Pan-African’ orogenic belts that formed during the amalgamation of the Gondwana, such as the East African and Prydz-Darling orogens between the segments of Gondwana. Early Neoproterozoic ages are dominant in the above sedimentary rocks of this study and correlate well with the large volume of 900–1000 Ma magmatism in Grenville-age provinces (e.g. Rayner-Eastern Ghats belt in India-East Antarctica) formed from ocean closure and collision tectonics during the Rodinia assembly. Our Hf isotopic data for detrital zircons of above ages suggest different origins, i.e. crustal reworking and growth at episodes of ca. 2.5 Ga, 0.9–1.0 Ga, 0.75–0.87 Ga and 0.6–0.68 Ga. Coupled with the stratigraphic relationship, these age and Hf isotopic data support a South China-North India-Qiangtang continental margin system along the northern margin of the East Gondwana. The west portion of South China was possibly connected to the uplifted Himalaya region in the early Cambrian with continuous detrital inputs from India and surrounding orogenic belts.
Persistent Identifierhttp://hdl.handle.net/10722/244925
ISSN
2017 Impact Factor: 3.907
2015 SCImago Journal Rankings: 3.214
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChen, Q-
dc.contributor.authorSun, M-
dc.contributor.authorLong, X-
dc.contributor.authorZhao, G-
dc.contributor.authorWang, J-
dc.contributor.authorWang, J-
dc.contributor.authorYu, Y-
dc.contributor.authorYuan, C-
dc.date.accessioned2017-09-18T02:01:32Z-
dc.date.available2017-09-18T02:01:32Z-
dc.date.issued2017-
dc.identifier.citationPrecambrian Research, 2017, v. 309, p. 271-289-
dc.identifier.issn0301-9268-
dc.identifier.urihttp://hdl.handle.net/10722/244925-
dc.description.abstractThe early Paleozoic and Devonian sedimentary rocks in the western part of the Yangtze Block were suggested to be derived from an exotic source that was once connected to South China. This conclusion was mainly based on that detrital zircons from these rocks give U-Pb age populations of 2400–2600 Ma, 1750–1850 Ma, 900–1000 Ma, 750–870 Ma and 500–680 Ma, but corresponding magmatic rocks of such late Archean, Grenvillian and latest Neoproterozoic-Cambrian ages do not outcrop in this area or adjacent regions. Zircons from the Cambrian sedimentary rocks of this study show the youngest age peak at ca. 550 Ma, and these zircons are mostly euhedral with positive eHf(t) values of +0.6 to +7.4. Because the unconformity between the Cambrian and Ordovician is evident in both west and south sides of South China, which is synchronous with its counterpart along the northern margin of the East Gondwana blocks (e.g. Himalaya region, Qiangtang, Western Australia), it is possible that these zircons were likely derived from a late Neoproterozoic-early Cambrian accretionary orogen (e.g. Bhimphedian orogeny) associated with the initial subduction of a proto-Tethys ocean beneath the margins of Gondwana continents. In contrast, the 500–680 Ma zircon population of the Silurian-Devonian sedimentary rocks give an older age peak at ca. 650 Ma and their eHf(t) values for the <540 Ma grains are all negative ( 27.8 to 0.3). These detrital zircons are rounded and could be possibly sourced from ‘Pan-African’ orogenic belts that formed during the amalgamation of the Gondwana, such as the East African and Prydz-Darling orogens between the segments of Gondwana. Early Neoproterozoic ages are dominant in the above sedimentary rocks of this study and correlate well with the large volume of 900–1000 Ma magmatism in Grenville-age provinces (e.g. Rayner-Eastern Ghats belt in India-East Antarctica) formed from ocean closure and collision tectonics during the Rodinia assembly. Our Hf isotopic data for detrital zircons of above ages suggest different origins, i.e. crustal reworking and growth at episodes of ca. 2.5 Ga, 0.9–1.0 Ga, 0.75–0.87 Ga and 0.6–0.68 Ga. Coupled with the stratigraphic relationship, these age and Hf isotopic data support a South China-North India-Qiangtang continental margin system along the northern margin of the East Gondwana. The west portion of South China was possibly connected to the uplifted Himalaya region in the early Cambrian with continuous detrital inputs from India and surrounding orogenic belts.-
dc.languageeng-
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/precamres-
dc.relation.ispartofPrecambrian Research-
dc.subjectDetrital zircon-
dc.subjectGondwana-
dc.subjectProvenance-
dc.subjectWest South China-
dc.subjectYangtze Block-
dc.titleProvenance study for the Paleozoic sedimentary rocks from the west Yangtze Block: Constraint on possible link of South China to the Gondwana supercontinent reconstruction-
dc.typeArticle-
dc.identifier.emailSun, M: minsun@hku.hk-
dc.identifier.emailZhao, G: gzhao@hku.hk-
dc.identifier.authoritySun, M=rp00780-
dc.identifier.authorityZhao, G=rp00842-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.precamres.2017.01.022-
dc.identifier.scopuseid_2-s2.0-85013053936-
dc.identifier.hkuros277162-
dc.identifier.hkuros294397-
dc.identifier.volume309-
dc.identifier.spage271-
dc.identifier.epage289-
dc.identifier.isiWOS:000430772300017-
dc.publisher.placeNetherlands-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats