ABSTRACT

We present a detailed geomorphological map of the landform assemblages originated by the two major paleoglaciers of the Sierra de Gredos mountain range in the Spanish Iberian Central System. Based on previous works, our map focused on the features formed by Gredos and Pinar paleoglaciers during the last glaciation and subsequent glacial events. Based on a remote sensing analysis and exhaustive field surveys, we identified with great accuracy the local distribution of glacial, periglacial, mass movement, structural, fluvial, and lacustrine features. We recognized three main glacial geomorphological formations representing: (i) the maximum glacial extension reached (peripheral deposits); (ii) the culmination of glacial conditions (principal moraines) and (iii) the local glacial withdrawal (internal deposits). Our map offers a renewed spatial framework on which to conduct higher-resolution glacial chronologies, especially of Late Glacial and Holocene glacial activity, providing key information for performing future paleoclimatic reconstructions of the northern hemisphere mid-latitudes.

摘要

我们提供了由西班牙伊比利亚中央系统中的塞拉德格雷多斯山脉的两个主要古冰川起源的地貌组合的详细地貌图。基于以前的工作，我们的地图着重于格雷多斯和皮纳尔古冰川在最后一次冰期和随后的冰川事件期间形成的特征。基于遥感分析和详尽的现场调查，我们以很高的准确性确定了冰川，周缘冰川，群众运动，结构，河流和湖泊特征的局部分布。我们认识到以下三个主要的冰川地貌形态：（i）达到的最大冰川扩展（外围沉积物）；（ii）冰河条件的高潮（主要是冰rain）和（iii）局部冰河退缩（内部沉积）。