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首页> 外文期刊>Geodinamica Acta >Evolution of karst in Messinian gypsum (Monferrato, Northern Italy)
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Evolution of karst in Messinian gypsum (Monferrato, Northern Italy)

机译：墨西尼石膏（意大利北部蒙费拉托）的岩溶演化

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摘要

In the Tertiary Basin of Piedmont (Northern Italy) a 100-150 m thick Messinian sedimentary succession crops out, composed of pre-evaporitic clays, gypsum beds and post-evaporitic lacustrine-marine fine-grained sediments. In the Monferrato area the thickness of the evaporite sequence is highly variable (0-140 m) due to an important erosion surface formed at the end of the evaporite cycle and carved in the gypsum beds. Epigenic caves probably formed during this short intra-Messinian phase of emersion. Cave sediments contain benthonic and planctonic foraminiferal associations ranging in age from Burdigalian to Upper Pliocene. These sediments have probably been deposited in recent times, although it cannot be completely ruled out that they accumulated in caves developed in Upper Messinian times. The formation of the most important caves of this area probably started at the end of the Messinian under epigenic conditions. Possibly, those inherited caves enlarged slowly during the Quaternary in an intrastratal and confined hypogene karst system.
机译：在皮埃蒙特第三纪盆地（意大利北部），出现了厚度为100-150 m的墨西尼沉积演替作物，其中包括蒸发前的粘土，石膏床和蒸发后的湖相-海洋细颗粒沉积物。在蒙费拉托地区，由于重要的侵蚀面在蒸发岩循环的末期形成并刻在石膏床上，因此蒸发岩层的厚度变化很大（0-140 m）。表观遗传上的洞穴可能是在短暂的梅西尼亚内部出现的萌芽期形成的。洞穴沉积物包含从布尔迪加利期到上新世的年龄的底栖和浮游有孔虫协会。这些沉积物可能是最近沉积的，尽管不能完全排除它们在上墨西尼时代形成的洞穴中的积累。该地区最重要的洞穴的形成可能始于在后生条件下的墨西拿末期。可能是那些继承的洞穴在第四纪期间在地层内和局限的次生岩溶系统中缓慢扩大。

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