Study on the Brittle-Ductile Shearing Zones in the Qixia Limestone in Northern Chaohu
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    Abstract:

    There are several small brittle-ductile sheared zones developed in the in the Permian Qixia limestone in northern Chaohu, which’s width is ranged from a few decades to slightly more than one meter and distributed along the strata bedding. A lot of calcite veins, foliation and sheared flanking folds develop in the violently shear parts. brittle-ductile shearing structures in the sheared zones are extreamly common, such as sheared foliation, S-C fabric, lineation, flanking folds, eye-ball structure, column structure and many other micro sheared structures which of them have not been dealed with up to now. The study reveals that the brittle-ductile shearing zones in the Qixia limestone in northern Chaohu are formed in about 3000 meter depth below the surface and at most less than 5500meters. The underground liquid, expecialy organic acid extrauted by organic matter during its maturation is benefited to the calcite brittle-ductile sheared deformation in the super shallow comdition.

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Zhong Jianhua,-,-,-,-.2009. Study on the Brittle-Ductile Shearing Zones in the Qixia Limestone in Northern Chaohu[J]. Acta Geologica Sinica,83(2):176-195

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History
  • Received:July 26,2008
  • Revised:July 28,2008
  • Adopted:July 28,2008
  • Online: April 14,2009
  • Published: