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Historical geochemical profiles of Sonne 140 cores from Lingayen Gulf, The Philippines: Some imprints of mine wastes from the past

机译:菲律宾Lingayen海湾的Sonne 140岩心的历史地球化学特征:过去矿山废物的一些烙印

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Mine wastes input of the Baguio Mineral District into the Lingayen Gulf can be traced in the gulf sediments using Cu and SO_4 historical profiles of SONNE 140 cores from representative sites in the gulf. Two watersheds, the Bued-Pantalan and the Agno, cover the mine sites and serve as major contributors of sediments to the gulf. Sediment core representative of the Bued-Pantalan watershed provides a well-defined geochemical profile of the mine wastes, which delineate correlative relationships between Cu and SO_4 to be highly significant (r=0.95). Elevated Cu concentrations in these sediments average 203 mg/kg for, at least, the last ten years based on reported sedimentation rates. Sediment core representative of the Agno watershed, on the other hand, yielded a lower average Cu load of 89 mg/kg and a lower correlation (i=0.64). Its historical geochemical profile depicts dilution of Cu concentrations, which we interpret as the combined results of Cu sequestration in the watershed by agriculture, the intermixing of the Pinatubo ash with the watershed sediments, and the gradual closure of mines in the Baguio Mineral District during the last ten years.
机译:可以使用来自海湾代表性地点的SONNE 140岩心的Cu和SO_4历史剖面图,将碧瑶矿区输入Lingayen海湾的矿山废料追踪到海湾沉积物中。布德-潘塔兰(Bued-Pantalan)和阿格诺(Agno)这两个分水岭覆盖了矿区,并成为海湾沉积物的主要来源。 Bued-Pantalan流域的沉积物核心代表提供了矿山废物的明确定义的地球化学特征,该特征将Cu和SO_4之间的相关关系描绘为非常重要的(r = 0.95)。根据报告的沉积速率,至少在最近十年中,这些沉积物中的铜平均浓度平均为203 mg / kg。另一方面,代表阿格诺流域的沉积物芯产生的平均铜负荷较低,为89 mg / kg,相关系数较低(i = 0.64)。它的历史地球化学特征描绘了铜浓度的稀释,我们将其解释为农业流域中的铜固存,皮纳图博火山灰与流域沉积物的混合以及碧瑶矿区在此期间逐渐关闭矿山的综合结果。最近十年。

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