Significant differences in late Quaternary bedrock erosion and transport: East versus West Greenland ∼70°N – evidence from the mineralogy of offshore glacial marine sediments
Significant differences in late Quaternary bedrock erosion and transport: East versus West Greenland ∼70°N – evidence from the mineralogy of offshore glacial marine sediments
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晚第四纪基岩侵蚀和迁移的显着差异：东格陵兰岛与西格陵兰岛~70°N – 来自近海冰川海洋沉积物矿物学的证据
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Emily P. Verplanck
中科院分区：
文献类型：
--
作者：
J. Andrews;A. Bjørk;D. Eberl;A. Jennings;Emily P. Verplanck
我们使用定量X射线衍射来确定西格陵兰和东格陵兰大陆架近海早第三纪玄武岩露头的晚第四纪海洋沉积物的矿物学。尽管玄武岩露头面积相似（60 000-70 000 km 2），但东格陵兰和西格陵兰沉积物中来自玄武岩露头的矿物（如辉石）部分存在显著差异。我们在三个尺度上展示了东格陵兰和西格陵兰海洋沉积物之间的矿物学差异：（1）现代，（2）晚第四纪输入和（3）来自两个边缘的10个岩心的详细地下变化。在东格陵兰大陆架（EGS），晚第四纪样品的平均石英重量百分比为6.2 ± 2.3%，而西格陵兰大陆架（WGS）的平均石英重量百分比为12.8 ± 3.9%，辉石的平均重量百分比为12.02 ± 4.8%，而西格陵兰大陆架的平均重量百分比为1.9 ± 2.3%。K均值聚类表明，只有9%的样本不符合简单的EGS与WGS二分法。来自EGS和WGS的沉积物在同位素上也是不同的，EGS的Nd同位素（−18至4）比WGS的高（Nd同位素= −25至−35）。我们将沉积物成分的显著二分法归因于两个玄武岩露头上根本不同的长期第四纪冰川作用。
We use quantitative X‐ray diffraction to determine the mineralogy of late Quaternary marine sediments from the West and East Greenland shelves offshore from early Tertiary basalt outcrops. Despite the similar basalt outcrop area (60 000–70 000 km2), there are significant differences between East and West Greenland sediments in the fraction of minerals (e.g. pyroxene) sourced from the basalt outcrops. We demonstrate the differences in the mineralogy between East and West Greenland marine sediments on three scales: (1) modern day, (2) late Quaternary inputs and (3) detailed down‐core variations in 10 cores from the two margins. On the East Greenland Shelf (EGS), late Quaternary samples have an average quartz weight per cent of 6.2 ± 2.3 versus 12.8 ± 3.9 from the West Greenland Shelf (WGS), and 12.02 ± 4.8 versus 1.9 ± 2.3 wt% for pyroxene. K‐means clustering indicated only 9% of the samples did not fit a simple EGS vs. WGS dichotomy. Sediments from the EGS and WGS are also isotopically distinct, with the EGS having higher ϵNd (−18 to 4) than those from the WGS (ϵNd = −25 to −35). We attribute the striking dichotomy in sediment composition to fundamentally different long‐term Quaternary styles of glaciation on the two basalt outcrops.
DOI：
10.1177/0959683612460785
发表时间：
2013-03
期刊：
The Holocene
影响因子：
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作者：
K. Perner;M. Moros;A. Jennings;J. Lloyd;K. Knudsen
通讯作者：
K. Perner;M. Moros;A. Jennings;J. Lloyd;K. Knudsen
巴芬湾地表（海底）和近地表（箱芯）沉积物矿物学是沉积物来源和冰盖变化的关键
影响因子：
1.4
作者：
Andrews J
通讯作者：
Andrews J
影响因子：
4
作者：
Andrews, John T.;Bigg, Grant R.;Wilton, David J.
通讯作者：
Wilton, David J.