RT Journal Article
T1 A high-resolution late Holocene speleothem record from Kaite Cave,northern Spain: δ18O variability and possible causes
A1 Domínguez Villar, David
A1 Wang, Xianfeng
A1 Cheng, Hai
A1 Martín Chivelet, Javier
A1 Edwards, R. Lawrence
AB A high-resolution calcite oxygen stable isotopic (δ18O) record, covering the past 4000 years, was obtained from Kaite Cave, northernSpain. The record has a mean δ18O value of -6.25% VPDB and a range of 2%. Spectral analysis of the d18O data shows significantperiodicities of 2400–1900, 600, 150, 27, and 22 years. The amplitudes during these periods range from 0.2% to 2%. Factors controllingthe isotopic ratio in the speleothem were evaluated. The calcite is most likely precipitated under equilibrium conditions, with the cavecalcite δ18O interpreted as a proxy of oxygen isotopic composition in local rainwater. Other factors such as temperature or fractionationin the karst system prior to calcite precipitation are considered of negligible or of minor importance. Mechanisms affecting rainfallisotopic composition were also investigated on different time scales. Precipitation amount is the primary factor controlling the high frequencyd18O oscillations. Other climate parameters, such as changes of storm tracks may have significant contributions on centennialand millennial time scales.
PB Elsevier
SN 1040-6182
YR 2008
FD 2008
LK https://hdl.handle.net/20.500.14352/50507
UL https://hdl.handle.net/20.500.14352/50507
LA eng
DS Docta Complutense
RD 29 abr 2025