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Usefulness of stream order to detect stream sediment geochemical anomalies

机译：河流次序对探测河流沉积物地球化学异常的有用性

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摘要

Unlike drainage basin area, stream order has not been quantitatively integrated in analysis of stream sediment geochemical data. It is hypothesized here that stream order is a useful surrogate for drainage basin area in ‘correcting’ for sediment dilution in order to detect stream sediment geochemical anomalies. Geochemical residuals, derived from catchment-based background corrections, are multiplied with respective sample site stream order to obtain stream-order-‘corrected’ residuals, which are compared and contrasted with corresponding values of productivity of a drainage basin. The validity of the hypothesis is tested and demonstrated in a drainage basin in the Aroroy gold district in the Philippines. There are strong and statistically significant correlations between stream-order-‘corrected’ residuals and values of productivity. Anomalous areas based on uni-element stream-order-‘corrected’ residuals are spatially identical or strongly spatially similar to anomalous areas based on uni-element values of productivity. Multi-element associations extracted from stream-order-‘corrected’ residuals are identical or highly similar to multi-element geochemical associations that can be extracted from values of productivity. The results of the study demonstrate that routine calculations of stream-order-‘corrected’ residuals would be particularly useful for interpretation of reconnaissance stream sediment geochemical data derived by sampling low-order streams.
机译：与流域不同，流阶没有被定量地 整合到流沉积物地球化学数据的分析中。 在这里假设流阶是有用的替代 对流域面积进行“校正”以进行沉积物 稀释，以检测河流沉积物地球化学异常。 地球化学残差，源自于集水区背景 更正，乘以各自的样本位点流 order以获得流序“校正”的残差 并与相应的值 进行对比流域生产力的最高标准。假设 的有效性在菲律宾Aroroy 黄金区的流域进行了测试和证明。在流序的“校正后的” 残差与生产率值之间存在很强的统计上显着的相关性。基于 基于单元素流阶“校正”残差 的异常区域与基于uni-stream的异常 区域在空间上相同或在空间上非常相似生产力的要素价值。从流阶校正后的 残基中提取的多元素 关联与可以提取的多元素地球化学 关联相同或高度相似 该研究结果表明，流阶“校正”残差的常规计算 特别对解释有用[sup> 取样低阶流获得的侦察流沉积物 地球化学数据。

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