The extent of middle Pleistocene ice cap in the coastal Dinaric Mountains of Croatia
The extent of middle Pleistocene ice cap in the coastal Dinaric Mountains of Croatia
复制标题
DOI：
10.1016/j.yqres.2016.03.006
复制
发表时间：
2016-05
影响因子：
2.3
通讯作者：
T. Marjanac;Ljerka Marjanac
中科院分区：
文献类型：
--
作者：
T. Marjanac;Ljerka Marjanac
Risnjak山和Velebit山以及亚得里亚海北方的克尔克岛和拉布岛上有单独的石灰岩块和石灰岩块群。以前的研究人员将其中一些解释为a）不稳定的块体，B）腐蚀残留物，或c）岩崩。我们研究了它们的产状和组成，并根据搬运机制和沉积过程修正了以前对其成因的解释。在分析了块体位置的背景和物理过程负责他们的就位，并考虑到他们的沉积学背景（与冰川沉积物的关联），我们在这里提出了大多数这些块体的冰川起源。然而，一些区块确实是由底土腐蚀形成的，正如其结构所证明的那样。解释的不稳定块内北方亚得里亚海岛屿的文件存在中更新世冰川的Dinaric山，虽然不是其最大的范围，这是仍然不清楚的冰的终点是在该地区被亚得里亚海冰后期上升淹没。重建的冰帽区，从里斯尼亚克山沿着沿着山脉延伸。到南Velebit山。从Lika Polje到Rab岛的整个范围保守估计为5400平方公里。
Solitary limestone blocks and groups of blocks occur on Risnjak and Velebit Mountains and on the northern Adriatic islands of Krk and Rab. Previous researchers have interpreted some of these as a) erratic blocks, b) corrosional remnants, or c) rockfalls. We have studied their mode of occurrence and composition, and revised previous interpretations of their origin in the light of transport mechanism and depositional processes. After analyzing the context of the block positions and the physical processes responsible for their emplacement, and taking into account their sedimentological context (their association with glaciogenic sediments), we herein propose a glacial origin for most of these blocks. However, some blocks are indeed shaped by sub-soil corrosion, as evidenced by their structure. The interpreted erratic blocks on the inner northern Adriatic Sea islands document the presence of middle Pleistocene glaciation of Dinaric Mountains though not its maximal extent, which is still unclear as the ice terminus was in the area that is inundated by postglacial rise of Adriatic Sea. The reconstructed ice cap area, which extended along the coastal mountains from Risnjak Mt. to south Velebit Mt. and across the range from Lika Polje to Rab Island, is conservatively estimated to be 5400 km2.