4.5 Article

Mantle-derived helium in foreland basins in Xinjiang, Northwest China

Journal

TECTONOPHYSICS
Volume 694, Issue -, Pages 319-331

Publisher

ELSEVIER
DOI: 10.1016/j.tecto.2016.11.015

Keywords

Natural gas; Mantle He; Compression tectonics; Foreland basin; NW China

Funding

  1. National Natural Science Foundation of China [41273112]
  2. Chinese Academy of Sciences [KZCX2-XB3-12]
  3. China National Key Basic Research and Development Program 973 [2011CB201102]

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Hydrocarbon-rich natural gases from the Tarim, Junggar, Turpan-Hami and Santanghu basins in Xinjiang, North-west China have measured He-3/He-4 ratios from 0.01 to 0.6 times higher thah the atmospheric value, indicating 0-7% helium derived from the mantle. The mantle-derived helium is high in foreland basins associated with the Tianshan, Kunlun and Zhayier-Halalate orogenic mountains, but low towards the center of basins. This spatial distribution suggests that the mantle-derived helium originates either from fluids or small scale melts in the upper asthenospheric or lithospheric mantle which have found pathways into the root zones of the major faults defining these mountains, but do not significantly move into the basins themselves. During upward transport to near the surface, the mantle-derived helium is significantly diluted by radiogenic helium produced in the crust. Despite the lack of recent magmatic activity or extensional tectonics within the basins, this pattern shows strong evidence that the major faults play an important role in mantle-derived components degassing from the mantle to the surface. (C) 2016 Elsevier B.V. All rights reserved.

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