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Research ArticleArticles

Geochronologic and geochemical evidence for persistence of south-dipping subduction to late Permian time, Langshan area, Inner Mongolia (China): Significance for termination of accretionary orogenesis in the southern Altaids

Li'na Lin, Wenjiao Xiao, Bo Wan, Brian F. Windley, Songjian Ao, Chunming Han, Jianyun Feng, Ji'en Zhang and Zhiyong Zhang
American Journal of Science February 2014, 314 (2) 679-703; DOI: https://doi.org/10.2475/02.2014.08
Li'na Lin
* State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
** Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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Wenjiao Xiao
*** Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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  • For correspondence: wj-xiao@mail.igcas.ac.cn
Bo Wan
*** Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
§ Department of Geological Sciences, Stockholm University, Stockholm 106 91, Sweden
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Brian F. Windley
§§ Department of Geology, University of Leicester, Leicester, LE1 7RH, UK
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Songjian Ao
* State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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Chunming Han
* State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
*** Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
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Jianyun Feng
* State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
** Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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Ji'en Zhang
* State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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Zhiyong Zhang
* State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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Abstract

The Langshan area in Inner Mongolia is situated in the southern Altaids between the Beishan suture to the west and the Solonker suture to the east. This paper addresses the poorly known tectonic evolution that led to formation of the terminal Solonker suture. Dating of deformed porphyries and undeformed dolerites and gabbros constrains the timing of the relevant NE-E-striking and north-vergent deformation. Deformed granitic-granodioritic porphyries in this area are characterized by high SiO2 (65.38-78.00%), low TFe2O3 (1.29-5.07%), MgO (0.13-0.63%), and variable K2O (0.53-4.14%) and Na2O (2.05-4.62%). All samples have enriched LREE (La/Yb 6-18) and negative Nb anomalies (NbN/ThN0.09-0.48), but different Eu anomalies (Eu* <0.7 or ∼1); these geochemical features can be ascribed to a heterogeneous source in a subduction-related environment. Gabbros and dolerites have 42.33 to 52.03 percent SiO2. All mafic samples have similar La/Yb ratios of 4 to 6 and negative Nb anomalies (NbN/ThN) ratios of 0.2 to 0.8, suggestive of a subduction-related setting. Two granitic porphyries yielded 238U/206Pb weighted mean ages of 284.7 ± 2.1 Ma with MSWD of 1.6 and 291.7 ± 2.1 Ma with MSWD of 1.14; these ages are consistent with 235U/207Pb and 238U/206Pb concordia ages of 281 ± 17 Ma with MSWD of 0.87 and 289.8 ± 9.2 Ma with MSWD of 0.66. A dolerite yielded concordia ages of 256.2 ± 2.6 Ma with MSWD of 0.44 and 256 ± 2.5 Ma with MSWD 0.45. The ages and geochemistry of the deformed porphyries indicate that in the early Permian there was important deformation and recrystallization in a subduction-related setting. The isotopic and geochemical signatures of all the rocks indicate that they formed during subduction-related conditions. We propose that Langshan was a Permian active continental margin arc built on the edge of the North China Craton by southward subduction, which led to closure of the ocean, concomitant formation of the Solonker suture in the late Permian-early Triassic, and termination of the accretion-subduction orogen of the southern Altaids.

  • Langshan
  • Permian
  • accretionary tectonics
  • North China Craton
  • Andean-type arc
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American Journal of Science: 314 (2)
American Journal of Science
Vol. 314, Issue 2
1 Feb 2014
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Geochronologic and geochemical evidence for persistence of south-dipping subduction to late Permian time, Langshan area, Inner Mongolia (China): Significance for termination of accretionary orogenesis in the southern Altaids
Li'na Lin, Wenjiao Xiao, Bo Wan, Brian F. Windley, Songjian Ao, Chunming Han, Jianyun Feng, Ji'en Zhang, Zhiyong Zhang
American Journal of Science Feb 2014, 314 (2) 679-703; DOI: 10.2475/02.2014.08

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Geochronologic and geochemical evidence for persistence of south-dipping subduction to late Permian time, Langshan area, Inner Mongolia (China): Significance for termination of accretionary orogenesis in the southern Altaids
Li'na Lin, Wenjiao Xiao, Bo Wan, Brian F. Windley, Songjian Ao, Chunming Han, Jianyun Feng, Ji'en Zhang, Zhiyong Zhang
American Journal of Science Feb 2014, 314 (2) 679-703; DOI: 10.2475/02.2014.08
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Keywords

  • Langshan
  • Permian
  • accretionary tectonics
  • North China Craton
  • Andean-type arc

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