Late Neogene climate and glacial history of the Southern Victoria Land coast from integrated drill core, seismic and outcrop data

详细信息    查看全文

• 作者：Richard Levy^a ; ^{r.levy@gns.cri.nz} ; Rosemary Cody^b ; James Crampton^a ; Christopher Fielding^c ; Nick Golledge^b ; David Harwood^c ; Stuart Henrys^a ; Robert Mckay^b ; Timothy Naish^b ; Christian Ohneiser^d ; Gary Wilson^d ; Terry Wilson^e ; Diane Winter^f
• 关键词：Neogene ; Antarctica ; diatom ; ANDRILL ; quantitative biostratigraphy ; climate ; tectonics
• 刊名：Global and Planetary Change
• 出版年：2012
• 出版时间：2012
• 年：2012
• 卷：80-81
• 期：Complete
• 页码：61-84
• 全文大小：3640 K

文摘

Late Neogene stratigraphy of southern Victoria Land Basin is revealed in coastal and offshore drill cores and a network of seismic data in McMurdo Sound, Antarctica. These data preserve a record of ice sheet response to global climate variability and progressive cooling through the past 5 million years. Application of a composite standard age model for diatom event stratigraphy to the McMurdo Sound drill cores provides an internally precise mechanism to correlate stratigraphic data and derive an event history for the basin. These marine records are indirectly compared to data obtained from geological outcrop in the Transantarctic Mountains to produce an integrated history of Antarctic Ice Sheet response to climate variability from the early Pliocene to Recent. Four distinct chronostratigraphic intervals reflect stages and steps in a transition from a relatively warm early Pliocene Antarctic coastal climate to modern cold polar conditions. Several of these stages and steps correlate with global events identified via geochemical proxy data recovered from deep ocean cores in mid to low latitudes. These correlations allow us to consider linkages between the high southern latitudes and tropical regions and establish a temporal framework to examine leads and lags in the climate system through the late Neogene and Quaternary. The relative influence of climate-tectonic feedbacks is discussed in light of glacial erosion and isostatic rebound that also influence the history along the Southern Victoria Land coastal margin.