Maps of Pleistocene sea levels in Southeast Asia: shorelines, river systems and time durations
Maps of Pleistocene sea levels in Southeast Asia: shorelines, river systems and time durations
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DOI：
10.1046/j.1365-2699.2000.00489.x
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发表时间：
2000-09-01
影响因子：
3.9
通讯作者：
Voris, HK
中科院分区：
文献类型：
--
作者：
Voris, HK
目的晚更新世冰川和冰川消融以及伴随而来的海平面的下降和上升对东南亚的陆块结构产生了重大影响。这份报告的目的是提供一系列地图，估计更新世期间印度-澳大利亚地区裸露的陆地面积，当时海平面低于今天的水平。位置这里提供的地图覆盖热带东南亚和南亚。东西覆盖范围从澳大利亚到斯里兰卡，绵延8000公里。从台湾到澳大利亚的南北覆盖范围为5000公里。方法利用现代水深等高线估算过去的海岸线，以及舜他和萨胡尔陆架主要溺水水系的位置。过去25万年来与冰川作用有关的海平面变化的时间来自多个来源，在某些情况下，这些来源解释了所述时期的构造抬升和下沉。结果这份报告提供了一系列地图，估计了在此之前17,000,150,000和250,000年期间印度-澳大利亚地区裸露的陆地面积。古海岸线是以今天10、20、30、40、50、75、100和120米的深度等高线为基础的。在描绘低于现在水平75、100和120米的海岸线的地图上，描绘了Sunda和Sahul陆架的主要更新世河流水系。给出了主要海平面波动事件的次数和海平面达到或低于图示海平面的持续时间的估计。主要结论以前对更新世海平面变化的重建强调了最大低点。这里提供的观点强调，海平面在相对较短的时间内处于最低水平，但在所审议的每个时间段中，有一半以上的时间处于或低于中间水平(例如，低于目前水平40米或以下)。
Aim Glaciation and deglaciation and the accompanying lowering and rising of sea levels during the late Pleistocene are known to have greatly affected land mass configurations in Southeast Asia. The objective of this report is to provide a series of maps that estimate the areas of exposed land in the Indo-Australian region during periods of the Pleistocene When sea levels were below present day levels.Location The maps presented here cover tropical Southeast Asia and Austral-Asia. The east-west coverage extends 8000 km from Australia to Sri Lanka. The north-south coverage extends 5000 km from Taiwan to Australia.Methods Present-day bathymetric depth contours were used to estimate past shore lines and the locations of the major drowned river systems of the Sunda and Sahul shelves. The timing of sea level changes associated with glaciation over the past 250,000 years was taken from multiple sources that, in some cases, account for tectonic uplift and subsidence during the period in question.Results This report provides a series of maps that estimate the areas of exposed land in the Indo-Australian region during periods of 17,000, 150,000 and 250,000 years before present. The ancient shorelines are based on present day depth contours of 10, 20, 30, 40, 50, 75, 100 and 120 m. On the maps depicting shorelines at 75, 100 and 120 m below present levels the major Pleistocene river systems of the Sunda and Sahul shelves are depicted. Estimates of the number of major sea level fluctuation events and the duration of time that sea levels were at or below the illustrated level are provided.Main conclusions Previous reconstructions of sea-level change during the Pleistocene have emphasized the maximum lows. The perspective provided here emphasizes that sea levels were at their maximum lows for relatively short periods of time but were at or below intermediate levels (e.g. at or below 40 m below present-day levels) for more than half of each of the time periods considered.