Integrating petrography, mineralogy and hydrochemistry to constrain the influence and distribution of groundwater contributions to baseflow in poorly productive aquifers: insights from Gortinlieve catchment, Co. Donegal, NW Ireland.
Integrating petrography, mineralogy and hydrochemistry to constrain the influence and distribution of groundwater contributions to baseflow in poorly productive aquifers: insights from Gortinlieve catchment, Co. Donegal, NW Ireland.
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综合岩相学、矿物学和水化学来限制地下水对低产含水层基流的影响和分布：来自爱尔兰西北部多尼戈尔郡 Gortinlieve 集水区的见解。
DOI：
10.1016/j.scitotenv.2014.08.105
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Caulfield J
中科院分区：
文献类型：
--
作者：
Caulfield J
确定地下水对基流的贡献是地表水体特征描述的重要组成部分。Gortinlieve流域（5平方公里）包括Carrigans河的源头河流网络，Carrigans河本身是爱尔兰西北部福伊尔河的一条支流。基岩包括生产力差的变质沉积物，其特征是裂缝孔隙度。我们提出了一个多学科的研究结果，将新的水化学和矿物学调查与现有的水力，地球物理和结构数据，以确定地下水流的规模和地下水/基岩相互作用（化学剥蚀）的性质。在流域尺度上，深部风化剖面的发育受格兰扁造山运动期间与造山作用相关的NE-SW区域尺度断裂带控制。矿物相的原位化学剥蚀作用受古新世至渐新世阿尔卑斯山挤压相关的微-中尺度断裂控制。原生白云母、斜绿泥石和钠长石沿着这些小规模裂缝表面的蚀变导致伊利石、蒙脱石和伊-蒙粘土混合物的沉淀。这些小规模结构的相互关联但不连续的性质突出了较大规模的断层和裂缝在向/从矿物风化地点供应和运输风化溶液中的作用。主要矿物相的溶解释放出主要离子Mg、Ca和HCO 3，这些离子随后形成地下水的化学组成。钻孔地下水和河流基流水化学数据用于约束地下水流路径的深度，影响整个河流剖面的地表沃茨化学。结果表明，它主要是较低的部分的集水区，它接收输入的集水区/区域规模的地下水流，被发现有助于维持年基流水平。这项研究确定了深层地下水在维持生产力低下的基岩系统的年基流水平的重要性。
Identifying groundwater contributions to baseflow forms an essential part of surface water body characterisation. The Gortinlieve catchment (5 km2) comprises a headwater stream network of the Carrigans River, itself a tributary of the River Foyle, NW Ireland. The bedrock comprises poorly productive metasediments that are characterised by fracture porosity. We present the findings of a multi-disciplinary study that integrates new hydrochemical and mineralogical investigations with existing hydraulic, geophysical and structural data to identify the scales of groundwater flow and the nature of groundwater/bedrock interaction (chemical denudation). At the catchment scale, the development of deep weathering profiles is controlled by NE-SW regional scale fracture zones associated with mountain building during the Grampian orogeny. In-situ chemical denudation of mineral phases is controlled by micro- to meso-scale fractures related to Alpine compression during Palaeocene to Oligocene times. The alteration of primary muscovite, chlorite (clinochlore) and albite along the surfaces of these small-scale fractures has resulted in the precipitation of illite, montmorillonite and illite-montmorillonite clay admixtures. The interconnected but discontinuous nature of these small-scale structures highlights the role of larger scale faults and fissures in the supply and transportation of weathering solutions to/from the sites of mineral weathering. The dissolution of primarily mineral phases releases the major ions Mg, Ca and HCO3that are shown to subsequently form the chemical makeup of groundwaters. Borehole groundwater and stream baseflow hydrochemical data are used to constrain the depths of groundwater flow pathways influencing the chemistry of surface waters throughout the stream profile. The results show that it is predominantly the lower part of the catchment, which receives inputs from catchment/regional scale groundwater flow, that is found to contribute to the maintenance of annual baseflow levels. This study identifies the importance of deep groundwater in maintaining annual baseflow levels in poorly productive bedrock systems.
爱尔兰西北部达尔拉德超群内新元古代造山带不整合面的证据
影响因子：
2.7
作者：
D. Hutton;G. Alsop
通讯作者：
G. Alsop
凯尔特地区的地下水
DOI：
--
发表时间：
2000
期刊：
Geological Society Special Publication
影响因子：
--
作者：
N. Robins;B. Misstear
通讯作者：
B. Misstear
通过泉水和溪流的水化学调查推断地下水对山地流域地表水的影响
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
C. Soulsby;D. Tetzlaff;N. V. D. Bedem;I. Malcolm;P. Bacon;A. Youngson
通讯作者：
A. Youngson