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Age and petrogenesis of Mingshui-Shuangjingzi granites from the northern Beishan area, northwest China, and their implications for tectonic evolution
Stockholm University, Faculty of Science, Department of Geological Sciences. Chinese Academy of Geological Sciences, China.
Stockholm University, Faculty of Science, Department of Geological Sciences.
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Number of Authors: 5
2017 (English)In: Geosciences Journal, ISSN 1226-4806, Vol. 21, no 5, 667-682 p.Article in journal (Refereed) Published
Abstract [en]

The Mingshui and Shuangjingzi granitic plutons are exposed in the northern Beishan area, in the southern Central Asia Orogenic Belt. U-Pb zircon dating indicates that Mingshui secondary intrusive lithosfacies and Shuangjingzi quartz monzodiorite formed at 328 +/- 2 Ma and 272 +/- 2 Ma, respectively. The former is composed of grey white monzogranites and potassic altered flesh red monzogranites. Geochemistry indicates they are calc-alkaline I-type granites. Shuangjingzi granites are mainly composed of unfractionated calc-alkaline I-type quartz monzodiorite, granodiorite and monzogranite. The Mingshui grey white monzogranites with negative initial epsilon(Nd) (-2.0 to -1.7) and moderate initial Sr-87/Sr-86 values (0.706740 to 0.710092) were probably derived from mixing of the depleted mantle (juvenile) component and the Palaeoproterozoic-Archean crust (or sedimentary) component and represent volcanic arc granites. The Shuangjingzi quartz monzodiorites are most likely derived from mafic to intermediate igneous protolith and represent post-collisional granites. This work, combined with the regional geology, suggests the Palaeo-Asian Ocean closed between 328 Ma and 272 Ma in the northern Beishan area.

Place, publisher, year, edition, pages
2017. Vol. 21, no 5, 667-682 p.
Keyword [en]
Central Asia Orogenic Belt, Beishan, Palaeozoic, granite, post-collisional, geochemistry, geochronology
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-148941DOI: 10.1007/s12303-017-0017-5ISI: 000412334600002OAI: oai:DiVA.org:su-148941DiVA: diva2:1156718
Available from: 2017-11-14 Created: 2017-11-14 Last updated: 2017-11-14Bibliographically approved

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