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research
Tectonic affinity of the west Qinling terrane (central China): North China or Yangtze?
Authors
WL Griffin
SY O'Reilly
+7 more
M Sun
HY Tang
L Xiao
HF Zhang
ZH Zhang
JP Zheng
HW Zhou
Publication date
1 January 2010
Publisher
'American Geophysical Union (AGU)'
Doi
Cite
Abstract
[33] Neogene (̃14 Ma) basaltic magmatism has occurred in west Qinling, at the northeastern corner of the Tibetan Plateau. Furthermore, U-Pb ages and Hf isotopic data of xenocrystic zircons indicate that the unexposed Neoarchean (2.7-2.5 Ga) basement beneath the Phanerozoic outcrops in west Qinling has affinities with the southern margin of the north China block. The basement has a complex evolution, including the addition of juvenile mantle material at ̃2.7- 2.4 Ga and 1.1-0.8 Ga and reworking at ̃1.8 Ga and possibly at 1.4 Ga. Phanerozoic thermal events at 320-300 Ma, 230 Ma, and 160 Ma also have affected the basement. We interpret the west Qinling orogenic terrane as originally separated from the north China block, joined to the northern Yangtze block during the Meso-Neoproterozoic, and finally involved in the northward subduction and collision of the Yangtze block in the Paleozoic and early Mesozoic and subsequent lithospheric extension in the Jurassic. © 2010 by the American Geophysical Union.published_or_final_versio
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Macquarie University ResearchOnline
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Last time updated on 18/08/2016
HKU Scholars Hub
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oai:hub.hku.hk:10722/159506
Last time updated on 01/06/2016