DOI: 10.1016/j.palaeo.2015.02.029
论文题名: Middle-late Holocene Caribbean aridity inferred from foraminifera and elemental data in sediment cores from two Cuban lagoons
作者: Gregory B.R.B. ; Peros M. ; Reinhardt E.G. ; Donnelly J.P.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 426 起始页码: 229
结束页码: 241
语种: 英语
英文关键词: Caribbean Paleoclimate
; Coastal Lagoon
; Cuba
; Foraminifera
; Holocene
; X-ray fluorescence
英文摘要: Coastal lagoons are rarely used as paleoclimate archives because of their complex geomorphic histories, which can be affected by both climate and sea-level change. Combined foraminiferal and XRF element analysis of sediment cores from Punta de Cartas and Playa Bailen, Cuba, isolated the effects of climate change (wet vs dry) on the lagoon environments. Foraminiferal assemblages from both Punta de Cartas and Playa Bailen show increasing diversity over the past 4000. yr. BP, with a prominent increase at ~. 1400-1100. yr. BP. Assemblages were initially dominated by Ammonia spp. (e.g., Ammonia tepida) and Elphidium spp. (e.g., Elphidium excavatum), indicating brackish conditions, but increased miliolid species (e.g., Triloculina spp. Quinqueloculina spp.), indicate a shift to more marine conditions up-core. Correspondingly, terrigenous input to the lagoon (Fe, Ti, Ti/Ca and K) declined over the past 4000. yr. BP with a flexion at ~. 1200-1100. yr. BP that is likely a consequence of decreasing precipitation. Fe, Ti and K have been used as proxies for detrital erosion and transport rates in tropical and sub-tropical basins, with greater input during wet periods, but have rarely been applied to shallow lagoon systems. Coincident changes in the XRF and foraminiferal data indicate decreased freshwater input to the lagoon and support an inference for the onset of drier climate conditions. Similar temporal patterns in the foraminifera and XRF records from the two lagoons, which are ~. 10. km apart, suggest a regional climate influence, with increasingly arid conditions developing since the middle-Holocene (4. kyr. BP). A pronounced drying over the last ~. 1200. years agrees with other climate records from the Caribbean. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68970
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography and Earth Sciences, McMaster University, 1280 Main Street West, Hamilton, ON, Canada; Department of Environmental Studies and Geography, Bishop's University, 2600 College Street, Sherbrooke, QC, Canada; Coastal Systems Group, Woods Hole Oceanographic Institution, 86 Water Street, Woods Hole, MA, United States
Recommended Citation:
Gregory B.R.B.,Peros M.,Reinhardt E.G.,et al. Middle-late Holocene Caribbean aridity inferred from foraminifera and elemental data in sediment cores from two Cuban lagoons[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,426