DOI: 10.1016/j.palaeo.2015.10.029
论文题名: Contrasting palaeoenvironments of the mid/late Miocene Dunedin Volcano, southern New Zealand: Climate or topography?
作者: Reichgelt T. ; Kennedy E.M. ; Jones W.A. ; Jones D.T. ; Lee D.E.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441 起始页码: 696
结束页码: 703
语种: 英语
英文关键词: Aspect
; Mid-latitudes
; Mid/late Miocene boundary
; Palaeoclimate
; Palaeotopography
英文摘要: At the mid/late Miocene boundary, a northward shift occurred in the Subtropical Front neighbouring the New Zealand continental landmass. The terrestrial palaeoenvironment of New Zealand concurrently underwent a period of cooling. The Dunedin Volcanic Group in southern New Zealand spans the mid/late Miocene boundary and the sedimentary deposits from Kaikorai Valley and Double Hill within this group contain diverse and well-preserved floral assemblages. We used terrestrial palaeoclimate proxies CLAMP (Climate Leaf Analysis Multivariate Program) and BA (Bioclimatic Analysis) to determine the paleoenvironment at southern mid-latitudes during the mid/late Miocene transition. Our results indicate that the mid/late Miocene climate of the Dunedin Volcano was warm-temperate to subtropical (mean annual temperature [MAT]: ~ 17-19 °C) at Double Hill, similar to modern coastal Queensland, and cool- to warm-temperate (MAT: ~ 12-14 °C) at Kaikorai Valley, similar to modern northern New Zealand. Winter temperatures at Kaikorai Valley were distinctly cooler (~ 6-8 °C). Differing aspect (i.e. north vs south facing) may have played a part in determining solar radiation, particularly in an area of high relief, such as the Dunedin Volcano. Because Kaikorai Valley was situated facing south and Double Hill facing north, the two sites would have received differing radiative fluxes, particularly in winter, thereby possibly influencing the local environment, biota, and potentially also the palaeoclimate signal produced by floral proxies. This study provides evidence for the temperature decline in terrestrial palaeoenvironments at mid-latitudes caused by the northward movement of the Subtropical Front and strengthening of the Antarctic Circumpolar Current during the mid/late Miocene. © 2015 Elsevier B.V.. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68698
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geology, University of Otago, PO Box 56, Dunedin, New Zealand; Lamont-Doherty Earth Observatory of Columbia University, PO Box 1000, Palisades, NY, United States; GNS Science, P.O. Box 30-368, Lower Hutt, New Zealand
Recommended Citation:
Reichgelt T.,Kennedy E.M.,Jones W.A.,et al. Contrasting palaeoenvironments of the mid/late Miocene Dunedin Volcano, southern New Zealand: Climate or topography?[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441