{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T00:46:23Z","timestamp":1772757983202,"version":"3.50.1"},"reference-count":22,"publisher":"American Geophysical Union (AGU)","issue":"12","license":[{"start":{"date-parts":[[1996,12,1]],"date-time":"1996-12-01T00:00:00Z","timestamp":849398400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Water Resources Research"],"published-print":{"date-parts":[[1996,12]]},"abstract":"<jats:p>We used a combination of a grouping algorithm and a weathering algorithm to assess the contributions made by chemical weathering and anthropogenic inputs to the groundwater composition in a granitoid area. The first algorithm is based on the mathematical concept of equivalent relations between objects and is used to find groups of water samples. Using the grouping algorithm, we identified groups with similar chemistries in a set of data relating to the water composition in 160 springs and wells in the Fund\u00e3o area (Portugal). The second algorithm is based on stoichiometries, mass, and charge balances in weathering reactions and is used to relate the water composition of each identified group to water\u2010mineral interactions in the area. Background information on the petrology and mineralogy of the area allowed us to choose the most realistic water\u2010mineral interactions. We also had information about the use and composition of fertilizers in this agricultural area. In applying the weathering algorithm we considered all dissolved silica and bicarbonate to be produced by chemical weathering and all dissolved chloride, sulphate, and nitrate to be derived from other sources, mainly from fertilizers. The anthropogenic contributions to the water chemistries in the area are high. Despite the high background concentrations derived from pollution, we were able to assess the contribution of weathering to the water chemistries. We obtained realistic results with the two algorithms, supported by the fact that the spatial distribution of the samples belonging to the various groups shows a good correlation with the geology and petrology of the area.<\/jats:p>","DOI":"10.1029\/96wr01683","type":"journal-article","created":{"date-parts":[[2004,2,4]],"date-time":"2004-02-04T05:16:35Z","timestamp":1075871795000},"page":"3553-3570","source":"Crossref","is-referenced-by-count":85,"title":["Contributions of Water\u2010Rock Interactions to the Composition of Groundwater in Areas with a Sizeable Anthropogenic Input: A Case Study of the Waters of the Fund\u00e3o Area, Central Portugal"],"prefix":"10.1029","volume":"32","author":[{"given":"Fernando","family":"Pacheco","sequence":"first","affiliation":[]},{"given":"Cornelis H.","family":"van der Weijden","sequence":"additional","affiliation":[]}],"member":"13","published-online":{"date-parts":[[1996,12]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"1","article-title":"Distribui\u00e7\u00e3o de oligoelementes nas rochas e solos da regi\u00e3o do Fund\u00e3o","volume":"71","author":"Costa C. V.","year":"1971","journal-title":"Mem\u00f3rias e Not\u00edcias, Mus. e Lab. Mineral. e Geol. da Univ. de Coimbra"},{"key":"e_1_2_1_3_1","volume-title":"Statistics and Data Analysis in Geology","author":"Davis J. C.","year":"1986"},{"key":"e_1_2_1_4_1","unstructured":"Deer W. A. R. A.Howie J.Zussmann Rock\u2010Forming Minerals 1\u20135 Longmans Green Toronto Ont. 1962."},{"key":"e_1_2_1_5_1","volume-title":"The Geochemistry of Natural Waters","author":"Drever J. I.","year":"1988"},{"key":"e_1_2_1_6_1","volume-title":"Cluster Analysis","author":"Everitt B.","year":"1977"},{"key":"e_1_2_1_7_1","first-page":"405","volume-title":"Researches in Geochemistry","author":"Garrels R. M.","year":"1967"},{"key":"e_1_2_1_8_1","doi-asserted-by":"publisher","DOI":"10.1021\/ba-1967-0067.ch010"},{"key":"e_1_2_1_9_1","volume-title":"Clustering Algorithms","author":"Hartigan J.","year":"1975"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1002\/9780470316801"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(72)90007-5"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7037(73)90270-6"},{"key":"e_1_2_1_13_1","first-page":"31","article-title":"A magmatic arc in the Iberian Segment of the Hercynian chain, I, The northwest\u2010southeastlineament between Oporto (Portugal) and Zarza la Major (Spain)","volume":"94","author":"Portugal Ferreira M.","year":"1982","journal-title":"Mem\u00f3rias e Not\u00edcias, Mus. e Lab. Mineral. e Geol. da Univ. de Coimbra"},{"key":"e_1_2_1_14_1","first-page":"167","article-title":"A zonalidade de um plutonito: estruturas condicionantes e idades de evolu\u00e7\u00e3o (Plutonito do Fund\u00e3o, Portugal central)","volume":"99","author":"Portugal Ferreira M.","year":"1985","journal-title":"Mem\u00f3rias e Not\u00edcias, Mus. e Lab. Mineral. e Geol. da Univ. de Coimbra"},{"key":"e_1_2_1_15_1","volume-title":"Numerical Recipes in Pascal","author":"Press W. H.","year":"1989"},{"key":"e_1_2_1_16_1","unstructured":"Sverdrup H. V. P.Warfvinge On the geochemistry of chemical weathering Chemical Weathering Under Field ConditionsK.Ros\u00e9n Rep. For. Ecol. For. Soil 63 79\u2013119Swed. Univ. Agric. Sci. Uppsala 1991."},{"key":"e_1_2_1_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/0009-2541(71)90011-8"},{"key":"e_1_2_1_18_1","doi-asserted-by":"publisher","DOI":"10.1016\/0016-7061(73)90002-5"},{"key":"e_1_2_1_19_1","unstructured":"Van der Weijden C. H. M. G.Oosterom J.Bril C. G.Walen S. P.Vriend B. W.Zuurdeeg Geochemical controls of transport and deposition of uranium from solution: Case study: Fund\u00e3o Portugal Tech. RepInst. of Earth Sci. Dep. of Geochem. Utrecht Univ. Utrecht Netherlands 1983."},{"key":"e_1_2_1_20_1","doi-asserted-by":"publisher","DOI":"10.2475\/ajs.285.10.904"},{"key":"e_1_2_1_21_1","doi-asserted-by":"publisher","DOI":"10.1007\/978-94-009-5333-8_14"},{"key":"e_1_2_1_22_1","doi-asserted-by":"publisher","DOI":"10.1346\/CCMN.1989.0370603"},{"key":"e_1_2_1_23_1","doi-asserted-by":"publisher","DOI":"10.2475\/ajs.292.1.58"}],"container-title":["Water Resources Research"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1029%2F96WR01683","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1029%2F96WR01683","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/pdf\/10.1029\/96WR01683","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,9,23]],"date-time":"2023-09-23T10:44:43Z","timestamp":1695465883000},"score":1,"resource":{"primary":{"URL":"https:\/\/agupubs.onlinelibrary.wiley.com\/doi\/10.1029\/96WR01683"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[1996,12]]},"references-count":22,"journal-issue":{"issue":"12","published-print":{"date-parts":[[1996,12]]}},"alternative-id":["10.1029\/96WR01683"],"URL":"https:\/\/doi.org\/10.1029\/96wr01683","archive":["Portico"],"relation":{},"ISSN":["0043-1397","1944-7973"],"issn-type":[{"value":"0043-1397","type":"print"},{"value":"1944-7973","type":"electronic"}],"subject":[],"published":{"date-parts":[[1996,12]]}}}