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DOI | 10.1130/B31482.1 |
An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition | |
Passchier, Sandra1; Ciarletta, Daniel J.1; Miriagos, Triantafilo E.1; Bijl, Peter K.2; Bohaty, Steven M.3 | |
2017-03-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Netherlands; England |
英文摘要 | Earth's current icehouse phase began similar to 34 m.y. ago with the onset of major Antarctic glaciation at the Eocene-Oligocene transition. Changes in ocean circulation and a decline in atmospheric greenhouse gas levels were associated with stepwise cooling and ice growth at southern high latitudes. The Antarctic cryosphere plays a critical role in the ocean-atmosphere system, but its early evolution is still poorly known. With a nearfield record from Prydz Bay, Antarctica, we demonstrate that Antarctic ice growth was stepwise and had an earlier onset than previously suggested. Prydz Bay lies downstream of a major East Antarctic Ice Sheet drainage system, and its sedimentary records uniquely constrain the timing of ice-sheet advance onto the continental shelf. We investigated a detrital record extracted from three Ocean Drilling Program drill holes within a new depositional and chronological framework spanning the late Eocene to early Oligocene (ca. 36-33 Ma). The chemical index of alteration (CIA) and the S index, calculated from the major-element geochemistry of bulk samples, yielded estimates of chemical weathering intensities and mean annual temperature on the East Antarctic continent. We document evidence for late Eocene mountain glaciation along with transient warm events at 35.8-34.8 Ma. From 34.4 Ma, associated with the Eocene-Oligocene transition precursor delta O-18 excursion, glaciers advanced into Prydz Bay, coincident with a decline in chemical weathering and temperature. We conclude that Antarctic continental ice growth commenced with the Eocene-Oligocene transition "precursor" glaciation, during a time of Subantarctic surface ocean cooling and a decline in atmospheric pCO(2). These results call for dynamic high-latitude feedbacks that are currently poorly represented in Earth system models and emphasize the need for additional near-field glacio-sedimentological, high-latitude sea-surface temperature and pCO(2) records across the Eocene-Oligocene transition. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000396813200005 |
WOS关键词 | GLOBAL CARBON-CYCLE ; SOUTHERN-OCEAN ; PRYDZ BAY ; CLIMATE TRANSITION ; EAST ANTARCTICA ; ATMOSPHERIC CO2 ; ODP SITE-1166 ; CENOZOIC GLACIATION ; MIDDLE EOCENE ; PACIFIC-OCEAN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24759 |
专题 | 地球科学 |
作者单位 | 1.Montclair State Univ, Dept Earth & Environm Studies, 1 Normal Ave, Montclair, NJ 07043 USA; 2.Univ Utrecht, Fac Geosci, Dept Earth Sci, Heidelberglaan 2, NL-3584 CS Utrecht, Netherlands; 3.Univ Southampton, Natl Oceanog Ctr Southampton, Ocean & Earth Sci, 20 European Way, Southampton SO14 3ZH, Hants, England |
推荐引用方式 GB/T 7714 | Passchier, Sandra,Ciarletta, Daniel J.,Miriagos, Triantafilo E.,et al. An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Passchier, Sandra,Ciarletta, Daniel J.,Miriagos, Triantafilo E.,Bijl, Peter K.,&Bohaty, Steven M..(2017).An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Passchier, Sandra,et al."An Antarctic stratigraphic record of stepwise ice growth through the Eocene-Oligocene transition".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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