武隆喀斯特及其地壳抬升性质解读

Wulong karst systems and as an indicator of local tectonic uplift

在特定的地质结构及峡谷水文网分布条件下,武隆喀斯特以独立发育的诸多包气带喀斯特系统为主要特征,而且不同喀斯特系统间的结构与形态组成差异甚大。喀斯特系统的分析可解读相适应的地壳运动性质是:自新近纪末期以来,地壳运动只有上升没有下降过程;前80～100万年为持续上升,即几乎没有相对稳定的经历;继后是间歇性抬升与相对稳定,似以后者占优;分布于深切峡谷相对高度150～300m间的大型成层性洞穴,主要发育于中更新世;晚更新世以来的上升与相对稳定彼此平分秋色。

Wulong karst comprises several karst systems which developed independently in the vadose zone of the limestone aquifer under distinct geological structure and core hydrographic conditions. Study of the karst systems in Wulong can elucidate the local tectonic uplift： from the later Neogene or early Pleistocene to present the area has been in a state of continuous uplift without evidence of subsidence. At the beginning of this time range, 80～100Ma of uplift occurred without relative stability. This was followed by uplift and relative stability, with the latter more significant than the former. During the middle Pleistocene large horizontal caves developed which are now found 150～300m above river level in deep gorges related to significant rivers. The uplift and relative stability may have occurred on a fifty-fifty basis since the late Pleistocene.