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Our results show that the SPAIV speleothem carries a primary and stable remanent magnetization, for which directions are similar to other speleothems from the western Alps. Magnetic declination and inclination curves are also comparable to current paleosecular variation models (SHA.DIF.14k, CALS10k.1b, and pfm9k.1a), one of them (SHA.DIF.14k) fitting better with the present data set. Relative paleointensity was estimated using two different methods: conventional normalization of natural remanent magnetization by anhysteretic and isothermal, and the pseudo\u2010Thellier method, which is being tested here for the first time in a speleothem. Both methods show similar results, with a minimum intensity peak at ~3,850\u00a0years\u00a0BCE. This low relative intensity is observed in all samples pertaining to the same respective calcite laminae. These results suggest that high growth rate speleothems are good high\u2010resolution recorders of the direction and intensity of the Earth's magnetic field.<\/jats:p>","DOI":"10.1029\/2018gc007651","type":"journal-article","created":{"date-parts":[[2018,8,18]],"date-time":"2018-08-18T05:23:23Z","timestamp":1534569803000},"page":"2962-2972","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Speleothems as Magnetic Archives: Paleosecular Variation and a Relative Paleointensity Record From a Portuguese Speleothem"],"prefix":"10.1029","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5747-0076","authenticated-orcid":false,"given":"J. M.","family":"Ponte","sequence":"first","affiliation":[{"name":"IDL\u2010FCUL, Instituto Dom Lu\u00eds, Faculdade de Ci\u00eancias Universidade de Lisboa  Lisbon Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0867-6529","authenticated-orcid":false,"given":"E.","family":"Font","sequence":"additional","affiliation":[{"name":"IDL\u2010FCUL, Instituto Dom Lu\u00eds, Faculdade de Ci\u00eancias Universidade de Lisboa  Lisbon Portugal"},{"name":"Departamento de Ci\u00eancias da Terra, Faculdade de Ci\u00eancias e Tecnologia Universidade de Coimbra  Coimbra Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9323-0723","authenticated-orcid":false,"given":"C.","family":"Veiga\u2010Pires","sequence":"additional","affiliation":[{"name":"CIMA\u2010FCT Universidade do Algarve  Faro Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3733-4632","authenticated-orcid":false,"given":"C.","family":"Hillaire\u2010Marcel","sequence":"additional","affiliation":[{"name":"GEOTOP Universit\u00e9 du Qu\u00e9bec  Montreal Quebec Canada"}]}],"member":"13","published-online":{"date-parts":[[2018,9,6]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggt240"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.pepi.2012.10.014"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1130\/G36695.1"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2013.08.031"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1029\/JB083iB04p01740"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1098\/rspa.1953.0064"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/2014JB011381"},{"key":"e_1_2_8_9_1","unstructured":"Ghaleb B. 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Moura D. &Hillaire\u2010Marcel C.(2014).Multi\u2010proxy constraints on ages of low U\u2010content young and \"dirty\" speleothems: Example from southern Portugal cave deposits abstract presented at EGU Wien Austria."},{"volume-title":"Paleomagnetism and its application to geological and geophysical problems","year":"1964","author":"Irving E.","key":"e_1_2_8_10_1"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1002\/2016JB013541"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365\u2010246X.1980.tb02601.x"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2014.12.031"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2011.10.031"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1029\/2006GC001368"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1365\u2010246x.1999.00777.x"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.quascirev.2011.08.004"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.1130\/G37490.1"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/0031\u20109201(89)90034\u20104"},{"key":"e_1_2_8_20_1","doi-asserted-by":"publisher","DOI":"10.1016\/0012-821X(86)90053-1"},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1038\/280383a0"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1139\/e82\u2010176"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.5636\/jgg.47.71"},{"key":"e_1_2_8_24_1","first-page":"87","article-title":"Paleomagnetism of speleothems in Gardner cave, Washington","volume":"52","author":"Martin K.","year":"1990","journal-title":"National Speleological Society Bulletin"},{"key":"e_1_2_8_25_1","doi-asserted-by":"publisher","DOI":"10.5636\/jgg.38.27"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365\u2010246X.1989.tb06011.x"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggu120"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365\u2010246X.1990.tb04594.x"},{"key":"e_1_2_8_29_1","doi-asserted-by":"publisher","DOI":"10.5636\/jgg.49.485"},{"key":"e_1_2_8_30_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2012.07.041"},{"key":"e_1_2_8_31_1","doi-asserted-by":"publisher","DOI":"10.1029\/2011JB008813"},{"key":"e_1_2_8_32_1","doi-asserted-by":"publisher","DOI":"10.1093\/gji\/ggv137"},{"key":"e_1_2_8_33_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2013.11.046"},{"key":"e_1_2_8_34_1","doi-asserted-by":"publisher","DOI":"10.1002\/2016JB013789"},{"key":"e_1_2_8_35_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2004.07.040"},{"key":"e_1_2_8_36_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.quageo.2011.02.002"},{"key":"e_1_2_8_37_1","doi-asserted-by":"publisher","DOI":"10.1002\/2013GC004950"},{"key":"e_1_2_8_38_1","doi-asserted-by":"publisher","DOI":"10.1029\/93RG01771"},{"key":"e_1_2_8_39_1","doi-asserted-by":"publisher","DOI":"10.1029\/95GL03166"},{"key":"e_1_2_8_40_1","first-page":"285","article-title":"Sur l'intensit\u00e9 du champ magn\u00e9tique terrestre dans le pass\u00e9 historique et g\u00e9ologique","volume":"15","author":"Thellier E.","year":"1959","journal-title":"Annales de Geophysique"},{"key":"e_1_2_8_41_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0012\u2010821X(03)00701\u20105"},{"key":"e_1_2_8_42_1","unstructured":"Veiga\u2010Pires C. 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