clastic parent material
... 碎屑物质：detrital material,fragmentary material 碎屑母质：clastic parent material 碎屑矿床：detrital deposits ...
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遂宁组母质易风化，风化后的碎屑黏聚力弱、结构力差，易遭受径流侵蚀。
Parent material of Suining group is easy eroded, and the erosion material is of poor cohesion and structure and even easier being eroded by runoff.
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