基底断裂（foundational fault，basement fault）是指切穿花岗质岩层基底，到达玄武岩层顶面的穿层断裂。
推断华蓥山断裂带系基底断裂的论点是正确的。
It is a correct argument that Huayingshan fault zone is a fundamental fault.
礁分布可能受隐伏基底断裂活动所形成的古构造控制。
Reef distribution may be controlled by the paleostructure produced by the activities of buried basement faults.
大石块位于地表脊状突起上，因侵蚀作用而出现密集的基底断裂。
The boulders perched on ridges are eroding out of densely fractured bedrock.
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