陆壳上的大多数沉积盆地都发育有正断层,它表明沉陷期间具有扩张作用。在许多盆地下面都出现有地壳衰减,意味着伴随着沉陷还有地壳的减薄。这就提出了一个问题,扩张是否能足以产生所观测到的沉陷和地壳的减薄。 Most of the sedimentary basins on the continental crust develop normal faults, which indicate the expansion during the subsidence. Crustal attenuation occurs below many basins, meaning there is a reduction in the crust along with the subsidence. This raises the question of whether the expansion is sufficient to produce the observed subsidence and crustal thinning.