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The Simao block, which is the northern extension of the Indochina block, and the Yangtze block were amalgamated by the closure of a Paleo-Tethys branch ocean commonly referred to as the Ailaoshan ocean. The exact location of the suture between these two continental blocks has been contested. Some researchers believed that it is located within the Cenozoic Ailaoshan shear zone whereas other researchers...
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