Geochemical features and tectonic setting of the Late Cambrian volcanic rocks in Baoshan area of western Yunnan Province

ZHANG Hu; FENG Qinglai; ZENG Wentao; YAO Xue; WANG Xiaolin; ZHAO Yunjiang

doi:10.12097/gbc.20151214

Geological Bulletin of China > 2015 > 34(12): 2280-2291. > DOI: 10.12097/gbc.20151214

ZHANG Hu, FENG Qinglai, ZENG Wentao, YAO Xue, WANG Xiaolin, ZHAO Yunjiang. 2015: Geochemical features and tectonic setting of the Late Cambrian volcanic rocks in Baoshan area of western Yunnan Province. Geological Bulletin of China, 34(12): 2280-2291. DOI: 10.12097/gbc.20151214

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Geochemical features and tectonic setting of the Late Cambrian volcanic rocks in Baoshan area of western Yunnan Province

Faculty of Earth Science, China University of Geosciences, Wuhan 430074, Hubei, China;2. Yunnan Institute of Geological Survey, Kunming 650051, Yunnan, China; 3. Kunming University of Science and Technology, Kunming 650093, Yunnan, China

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The Late Cambrian volcanic rocks in Shangyanqing－Baiyan'aolinchang of Baoshan area within western Yunnan Province are poorly developed but distributed extensively. The volcanic rocks consist of early tholeiitic and alkali-basalt and late calc-alkali basalt. The geochemical characteristics of rocks show that early volcanic rocks formed in an extensional environment, whereas advanced volcanic rock was formed by subduction. The tectonic background of Baoshan terrane exhibited the transformation from extension to subduction in the late Cambrian, with the formation of the unconformity between Ordovician and Cambrian. This discovery provides petrological evidence for the conversion of the eastern part of the northern margin of Gondwana from passive continental margin to active continental margin.
- western Yunnan,
- Cambrian,
- volcanic rocks,
- post-Pan African,
- extension,
- subduction,
- Baoshan terrane

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Geochemical features and tectonic setting of the Late Cambrian volcanic rocks in Baoshan area of western Yunnan Province

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