Late Pleistocene and Early Holocene aeolian deposits of Tasmania and their climatic implications

Late Pleistocene and Early Holocene aeolian deposits of Tasmania and their climatic implications
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塔斯马尼亚晚更新世和早全新世风积物及其气候影响

DOI:
10.1017/qua.2020.83
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发表时间:
2021
影响因子:
2.3
通讯作者:
Dixon, Grant
Dixon, Grant
中科院分区:
地球科学3区
文献类型:
--
作者:
McIntosh, Peter D.;Neudorf, Christina;Lian, Olav B.;Slee, Adrian J.;Walker, Brianna;Eberhard, Rolan;Doyle, Richard;Dixon, Grant

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塔斯马尼亚晚更新世和早全新世风积物在目前的半湿润气候区广泛存在,但也出现在年降雨量>1000毫米的地区。热释光、光激发光和放射性碳年龄表明大部分沉积物是在寒冷气候时期形成的。一些沙丘是纵向沙漠沙丘的残余物,这些沙丘来自现已被淹没的大陆架,而这些大陆架以前是半干旱的。其他的则在源头附近形成,通常以半干旱的中部地区和塔斯马尼亚东南部的季节性干燥泻湖以东的半月形形式形成,或者在主要河流的洪泛区附近堆积,或者在暴露区域形成沙床。 40 ka后原住民燃烧植被可能影响了沉积物的供应。确定塔斯马尼亚南部气候变化的一个关键地点是梅恩斯交界处,它记录了三个风沉积时期(约 90、32 和 20ka),其中穿插着山坡不稳定时期。末次冰河期的风速是否比现在更高尚不确定,但霍巴特附近玛丽安湾沙盘中的贝壳和塔斯马尼亚东北部安斯利沙丘的颗粒尺寸分析表明,末次冰期的风速比现在更强。
Late Pleistocene and Early Holocene aeolian deposits in Tasmania are extensive in the present subhumid climate zone but also occur in areas receiving >1000 mm of rain annually. Thermoluminescence, optically stimulated luminescence, and radiocarbon ages indicate that most of the deposits formed during periods of cold climate. Some dunes are remnants of longitudinal desert dunes sourced from now-inundated continental shelves which were previously semi-arid. Others formed near source, often in the form of lunettes east of seasonally-dry lagoons in the previously semi-arid Midlands and southeast of Tasmania, or as accumulations close to floodplains of major rivers, or as sandsheets in exposed areas. Burning of vegetation by the Aboriginal population after 40 ka is likely to have influenced sediment supply. A key site for determining climate variability in southern Tasmania is Maynes Junction which records three periods of aeolian deposition (at ca. 90, 32 and 20 ka), interspersed with periods of hillslope instability. Whether wind speeds were higher than at present during the last glacial period is uncertain, but shells in the Mary Ann Bay sandsheet near Hobart and particle size analysis of the Ainslie dunes in northeast Tasmania suggest stronger winds during the last glacial period than at present.
塔斯马尼亚东北部全新世早期原住民占领的新证据
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