GEOESPELEOLOGIA
URI permanente para esta coleçãohttps://bdc.icmbio.gov.br/handle/cecav/2
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Item Stalagmite paleomagnetic record of a quiet mid-to-late Holocene field activity in central South America(2022-03-15) Jaqueto, Plinio; Trindade, Ricardo I. F.; Terra-Nova, Filipe; Feinberg, Joshua M.; Valdir, F. Novello; Stríkis, Nicolás M.; Schroedl, Peter; Azevedo, Vitor; Strauss, Beck E.; Cruz, Francisco W.; Cheng, Hai; Edwards, R. LawrenceSpeleothems can provide high-quality continuous records of the direction and relative paleointensity of the geomagnetic field, combining high precision dating (with U-Th method) and rapid lock-in of their detrital magnetic particles during calcite precipitation. Paleomagnetic results for a mid-to-late Holocene stalagmite from Dona Benedita Cave in central Brazil encompass ~1900 years (3410 BP to 5310 BP, constrained by 12 U-Th ages) of paleomagnetic record from 58 samples (resolution of ~33 years). This dataset reveals angular variations of less than 0.06° yr−1 and a relatively steady paleointensity record (after calibration with geomagnetic field model) contrasting with the fast variations observed in younger speleothems from the same region under influence of the South Atlantic Anomaly. These results point to a quiescent period of the geomagnetic field during the mid-to-late Holocene in the area now comprised by the South Atlantic Anomaly, suggesting an intermittent or an absent behavior at the multi-millennial timescale.Item Quaternary depositional facies in cave entrances and their relation to landscape evolution: The example of Cuvieri Cave, eastern Brazil(Catena, 2017) Martim, Paulo M. Haddad; Hubbe, Alex; Giannini, Paulo C.F; Auler, Augusto S; Piló, Luís B; Hubbe, Mark; Mayer, Elver; Wang, Xianfeng; Cheng, Hai; Edwards, R. Lawrence; Neves, Walter AUm estudo na Caverna de Cuvieri permitiu novos conhecimentos sobre a dinâmica e evolução de tipos de facies sedimentares e sua relação com a paisagem próxima.Item U-series dating and taphonomy of quaternary vertebrates from Brazilian caves. Palaeogeography, Palaeoclimatology, Palaeoecology(Elsevier - Palaeogeography, Palaeoclimatology, Palaeoecology, 2006) Auler, Augusto S; Piló, Luís B.; Smart, Peter L.; Wang, Xianfeng; Hoffmann, Dirk; Richards, David A.; Edwards, R. Lawrence; Neves, Walter A.; Cheng, Hai