Periglacial landforms and deposits of Tasmania

Periglacial landforms and deposits of Tasmania
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塔斯马尼亚的冰缘地貌和沉积物

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发表时间：
2002
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通讯作者：
E. Colhoun
E. Colhoun
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作者：
E. Colhoun

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塔斯马尼亚只有有限的部分地区在1970年代晚期被冰川覆盖。 更新世冰外地区展现出许多地貌， 至少部分由冰缘沉积物形成的沉积物 流程.断块流、断块田、碎石发育良好 在中部和东部的粗玄岩高原上， 塔斯马尼亚岛，而斜坡沉积的角碎屑发生在 西部山区的硅质岩。广延化石 在塔斯马尼亚中部， 而现代的冻融阶地和冻土瓣 仅在植被较差的地区局部高于900米。主动排序 可能发生在600米以下的裸露地区， 1000米以上的雪区发生侵蚀。化石冰推海岸线 特征出现在粗玄岩中央高原的一些湖泊上， 而稳定的陆地沙丘出现在较低的海拔， 中部和东部。这些地貌和沉积物中， 年代久远，许多可能是在几次寒冷的天气中形成的。 更新世的各个阶段。几乎没有证据表明更新世 岛上1000-1200米以下的多年冻土。
Only limited parts of Tasmania were glaciated during the late Pleistocene. The extra-glacial regions exhibit many landforms and deposits that were developed at least partly by periglacial processes. Block streams, block fields and screes are well developed above 900 m on the dolerite plateaux of central and eastern Tasmania, while slope deposits of angular clasts occur on the siliceous rocks of western mountain areas. Extensive fossil solifluction deposits extend down to lIgc.l/Ig 500 m in central Tasmania, whereas modern frost-creep terraces and solifluction lobes occur only locally above 900 m in poorly vegetated areas. Active sorted polygonsmay occur on bare areas down to 600 m, and contemporary snowpatch erosion occurs above 1000 m. Fossil ice-pushed shoreline features occur on some lakes on the dolerite Central Plateau, while stabilized terrestrial sand dunes occur at lower altitudes in theMidlands and east. Few of these landforms and deposits are yet well dated, and many may have been formed during several cold stages of the Pleistocene. There is little evidence for Pleistocene permafrost below 1000-1200 m on the island.