... 槽状矿脉 trough reef 向斜底面 trough surface 槽型 trough type ...
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向斜面底 trough plane
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向斜轴部的岩层底面受张拉破碎为‘倒楔形’岩块，背斜轴部岩层底面受压破碎为‘正楔形’岩块。
The bottom of rocks at syncline axis is tensioned and inverse cuneiform-like rock masses are formed. By contraries, cuneiform-like rock masses are formed at anticline axis under compression.
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