Creation of an atlas of lake-sediment geochemistry of Western Labrador and Northeastern Québec
Creation of an atlas of lake-sediment geochemistry of Western Labrador and Northeastern Québec
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创建拉布拉多西部和魁北克东北部湖泊沉积物地球化学图集
DOI：
10.1144/geochem2018-061
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
R. Garrett
中科院分区：
文献类型：
--
作者：
S. Amor;M. McCurdy;R. Garrett
建立了21678个湖泊沉积物样品的地球化学数据库，经王水消解后用ICP-MS分析了53种元素。统计检验和合并数据的绘图（在某些情况下，在应用水准函数之后）表明，以前存在的不协调-在使用不同强度数字的分析之间-可以在很大程度上减轻。这样就可以绘制面积近30万平方公里的综合地球化学图。 许多大规模的地球化学特征所揭示的数据有关的古元古代“拉布拉多槽”，在该地区被称为新魁北克造山带的岩石。然而，那些由Rb、K、Ti、Li、Cs、Mg、Ga、Sn和Th的组合定义的、与LOI、Hg、Se、S、Ag、Cd、Ca和Sr负相关的元素可能与有机和无机碎屑物质的相对含量有关。湖泊沉积物中的碎屑物质，而不是基岩地质。希望合并后的数据将有助于对这一大片区域进行地质测绘，并促进矿产勘探。
A geochemical database of 21 678 lake-sediment samples, analysed for 53 elements by ICP-MS after aqua-regia digestion, has been created. Statistical tests and plots of the combined data (in some cases, after the application of levelling functions) show that the disharmony that existed previously – between analyses that employed digestions of differing strengths – can be largely alleviated. This allows the creation of integrated geochemical maps of an area of almost 300 000 km2. Many of the large-scale geochemical features revealed by the data are related to the rocks of the Paleoproterozoic ‘Labrador Trough’, within the region termed the New Quebec Orogen. However, those that are defined by an association of Rb, K, Ti, Li, Cs, Mg, Ga, Sn and Th, correlated negatively with LOI, Hg, Se, S, Ag, Cd, Ca and Sr may be related to the relative amounts of organic and inorganic clastic material in the lake sediment, rather than bedrock geology. It is hoped that the merged data will provide assistance to the geological mapping of this large area, as well as providing a stimulus for mineral exploration.