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Sand dunes up to 400 m high are common in the Badain Jaran Desert in China, but how and why mega-dunes grow remains unclear. Timing is the most critical to clarify this issue. The chronological data are still limited with only a few 14C ages from carbonate, not the direct age of the dune, and a few thermoluminescence (TL) ages whose unbleachable residual signals may result in uncertainty in age. Optically...
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