Surface (sea floor) and near-surface (box cores) sediment mineralogy in Baffin Bay as a key to sediment provenance and ice sheet variations
Surface (sea floor) and near-surface (box cores) sediment mineralogy in Baffin Bay as a key to sediment provenance and ice sheet variations
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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
DOI：
10.1139/e11-021
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发表时间：
2011
影响因子：
1.4
通讯作者：
Andrews J
中科院分区：
文献类型：
--
作者：
Andrews J
为了更好地了解巴芬湾周围冰盖的冰川历史并提供有关沉积物路径的信息，对来自 82 个海底抓斗和岩心顶部以及七个箱形岩心的样本进行了 <2 毫米沉积物部分的定量 X 射线衍射重量百分比 (wt.%) 分析。这些样品是在北纬 67° 至 78°N 之间、水深 155 至 2375 米之间采集的，并于公元 1964 年至 2009 年之间在巡航中取回。还获得了许多样品的粒度、磁性特征和颜色反射率数据。已鉴定出 21 种非粘土矿物和 10 种粘土矿物；非粘土矿物平均重量%为70%，以石英、各种长石、白云石为主，粘土矿物主要为1M伊利石、黑云母、绿泥石。主成分得分的聚类分析确定了三个主要矿物组，它们也与粒度和沉积物磁性有很强的相关性。中央盆地深处（>2000米）的箱形岩心均显示，在碎屑碳酸盐（主要是白云石）出现主峰后，方解石重量百分比突然下降（5 cal ka BP？）。 JR175BC06 中富含白云石的碎屑碳酸盐（DC）事件可能与新仙女木期冷事件同时发生。在成分分解算法中采用了四种可能的冰川来源端元，以深入了解中央盆地深处沉积物来源的核心变化。中央盆地的沉积物堆积速率估计仅为 2 至 4 厘米/卡卡，考虑到周围土地的冰川性质，这个速率低得惊人。
To better understand the glacial history of the ice sheets surrounding Baffin Bay and to provide information on sediment pathways, samples from 82 seafloor grabs and core tops, and from seven box cores were subjected to quantitative X-ray diffraction weight percent (wt.%) analysis of the <2 mm sediment fraction. The samples were collected between 67°N and 78°N, in water depths of 155 to 2375 m and were retrieved on cruises between A.D. 1964 and 2009. Grain size, magnetic characteristics, and colour reflectance data were also obtained on many of the samples. Twenty-one non-clay and 10 clay mineral species were identified; the average wt.% of the non-clay minerals was 70% and was dominated by quartz, various feldspars, and dolomite, whereas the dominant clay minerals were 1 M illite, biotite, and chlorite. Cluster analysis on principal component scores identified three main mineral groups, which also had strong associations with grain size and sediment magnetic properties. Box cores from the deep central basin (>2000 m) all show an abrupt drop in calcite wt.% (post-5 cal ka BP?) following a major peak in detrital carbonate (mainly dolomite). This dolomite-rich detrital carbonate (DC) event in JR175BC06 is possibly coeval with the Younger Dryas cold event. Four possible glacial-sourced end members were employed in a compositional unmixing algorithm to gain insight into down core changes in sediment provenance at the deep central basin. Estimates of the rates of sediment accumulation in the central basin are only in the range of 2 to 4 cm/cal ka, surprisingly low given the glaciated nature of the surrounding land.
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加拿大西北地区巴芬岛中部古生代不稳定因素的冰川扩散序列
影响因子：
1.4
作者：
C. R. Tippett
通讯作者：
C. R. Tippett
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DOI：
--
发表时间：
1985
期刊：
影响因子：
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作者：
R. Gilbert
通讯作者：
R. Gilbert
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DOI：
--
发表时间：
2006
期刊：
影响因子：
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作者：
J. Andrews;A. Jennings;M. Moros;C. Hillaire‐Marcel;D. Eberl
通讯作者：
D. Eberl
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DOI：
--
发表时间：
2003
期刊：
影响因子：
--
作者：
J. Briner;G. Miller;P. Davis;P. Bierman;M. Caffee
通讯作者：
M. Caffee
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DOI：
--
发表时间：
1989
期刊：
影响因子：
--
作者：
J. Andrews;Á. Geirsdóttir;A. Jennings
通讯作者：
A. Jennings