Abstract The end of the Late Paleozoic Ice Age was followed by a global warming climate. This climate transition is characterized by, beyond other aspects, decrease in the intensity of physical weathering, characteristic of arid conditions, and an increase in the intensity of chemical weathering. In the southern Parana Basin, the post-glacial onset and intense record of “Pedra-areia” diamictite within the Mariana Pimentel paleovalley was likely controlled by warming climate conditions and mark a period of intense rainfall and slope instability. To test this hypothesis, we have performed facies and sequence stratigraphy analysis on cores located within the Mariana Pimentel paleovalley, and U–Pb-Hf investigations to acquire sediment provenance information. Diamictite deposits were produced by debris flow processes, which transported regolith from the valley wall to the bottom, eroding and incorporating mud and peat when reaching the bottom of the valley. Local source of sediment is explained by the sedimentological characteristics of the diamictite and zircon provenance studies. These deposits are preserved within the transgressive system tract and the abundant deposition was controlled by increasing temperature and humidity, and thus the increase in chemical weathering on the walls, forming the regolith. The development of more humid and warmer climatic conditions, contrasting with the cold and dry climate of the glacial period, was an important control over diamictite deposition.

中文翻译：

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冰川后二叠纪碎屑流沉积物及其古气候影响（巴拉那盆地南部马里亚纳皮门特尔古河谷）

摘要 晚古生代冰河时代结束后，全球气候变暖。除了其他方面，这种气候转变的特点是物理风化强度降低、干旱条件特征以及化学风化强度增加。在巴拉那盆地南部，马里亚纳皮门特尔古河谷内“Pedra-areia”混叠岩的后冰期开始和强烈记录可能受到气候条件变暖的控制，并标志着一段强降雨和斜坡不稳定时期。为了验证这一假设，我们对位于马里亚纳皮门特尔古河谷内的岩心进行了相和层序地层分析，并进行了 U-Pb-Hf 调查以获取沉积物来源信息。混积岩矿床是由泥石流过程产生的，将风化层从谷壁运送到谷底，在到达谷底时侵蚀并吸收泥土和泥炭。当地沉积物来源可以通过混积岩和锆石来源研究的沉积学特征来解释。这些沉积物保存在海侵系统域内，丰富的沉积物受到温度和湿度增加的控制，因此墙壁上的化学风化作用增加，形成风化层。与冰河时期寒冷干燥的气候形成对比，更加潮湿和温暖的气候条件的发展是对混叠岩沉积的重要控制。当地沉积物来源可以通过混积岩和锆石来源研究的沉积学特征来解释。这些沉积物保存在海侵系统域内，丰富的沉积物受到温度和湿度增加的控制，因此墙壁上的化学风化作用增加，形成风化层。与冰河时期寒冷干燥的气候形成对比，更加潮湿和温暖的气候条件的发展是对混叠岩沉积的重要控制。当地沉积物来源可以通过混积岩和锆石来源研究的沉积学特征来解释。这些沉积物保存在海侵系统域内，丰富的沉积物受到温度和湿度增加的控制，因此墙壁上的化学风化作用增加，形成风化层。与冰河时期寒冷干燥的气候形成对比，更加潮湿和温暖的气候条件的发展是对混叠岩沉积的重要控制。