Geomorphology and late Holocene climatic change in northeastern Spain
Geomorphology and late Holocene climatic change in northeastern Spain
复制标题
DOI：
10.1016/s0169-555x(98)00004-x
复制
发表时间：
1998-06-01
期刊：
影响因子：
3.9
通讯作者：
Pena-Monne, JL
中科院分区：
文献类型：
--
作者：
Gutierrez-Elorza, M;Pena-Monne, JL
在晚全新世，积累和下切阶段影响了在西班牙东北部的半干旱地区的斜坡和填充的山谷。斜坡沉积物和山谷填充物中的考古遗迹、木炭和灰烬的存在使得有可能进行准确的年代测定。在充填谷的情况下，不同的堆积在区域水平上可能是穿时的。不同充填河谷之间的历时性可能是人类活动和系统复杂响应的共同作用。在斜坡上，人们可以区分两个积累期，这两个积累期被一个下切期分开。老堆积阶段分布广泛，从青铜时代发展到伊比利亚-罗马时代。随后的积累期形成于后中世纪时期，空间上受到更多的限制。由于这些堆积所表现出的普遍的同步性，提出了一种气候原因作为斜坡堆积下切阶段的可能触发因素。测年结果表明，第一次堆积相当于铁器时代的寒武纪（公元前900-300年）。第二次是小冰河时期在这两个积累时期之间，发生了一个下切阶段（大约从公元前300年到公元1450年）。这种下切间隔可以与亚大西洋期的温暖阶段，在此期间，有一个相对较低的百分比植被覆盖。最后，仍在发生的最后一个切割期影响了以前的积累。(C)1998 Elsevier Science B. V.保留所有权利。
During the late Holocene, accumulation and downcutting stages affected the slopes and infilled valleys in the semiarid areas in NE Spain. The presence of archaeological remains, charcoal and ashes within slope deposits and valley fills makes it possible to carry out accurate datings. In the case of infilled valleys, the different accumulations may be diachronous at a regional level. These diachronisms among different infilled valleys may be caused by both human activity and complex responses of the system. On the slopes, one can distinguish between two accumulation periods separated by an incision period. The older accumulation stage has a widespread distribution and developed from the Bronze Age to the Iberian-Roman Epoch. The following accumulation period was formed in the Post-Medieval period and is spatially more restricted. Because of the widespread synchronism shown by these accumulations, a climatic cause is put forward as the possible triggering factor for the accumulation-incision stages in the slopes. The datings obtained indicate that the first accumulation corresponds to the Iron Age Cold Epoch (900-300 years B.C.) and the second to the Little Ice Age. Between both accumulation periods, a downcutting stage took place (approximately from 300 B.C. to 1450 A.D.). This downcutting interval can be related to the warm stages of the Subatlantic Period, during which there was a relatively lower percentage of vegetation cover. Finally, the last incision period, which is still taking place, has affected previous accumulations. (C) 1998 Elsevier Science B.V. All rights reserved.