Timing and climatic consequences of the opening of Drake Passage

被引：411

作者：

Scher, HD ^{[1
]}

Martin, EE ^{[1
]}

机构：

[1] Univ Florida, Dept Geol Sci, Gainesville, FL 32611 USA

来源：

SCIENCE | 2006年 / 312卷 / 5772期

关键词：

D O I：

10.1126/science.1120044

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Age estimates for the opening of Drake Passage range from 49 to 17 million years ago (Ma), complicating interpretations of the relationship between ocean circulation and global cooling. Secular variations of neodymium isotope ratios at Agulhas Ridge (Southern Ocean, Atlantic sector) suggest an influx of shallow Pacific seawater approximately 41 Ma. The timing of this connection and the subsequent deepening of the passage coincide with increased biological productivity and abrupt climate reversals. Circulation/productivity linkages are proposed as a mechanism for declining atmospheric carbon dioxide. These results also indicate that Drake Passage opened before the Tasmanian Gateway, implying the late Eocene establishment of a complete circum-Antarctic pathway.

引用

页码：428 / 430

页数：3

共 32 条

[1]

ANDERSON LC, COMMUNICATION

[2] Middle Eocene to early Oligocene paleoceanography from Agulhas Ridge, Southern Ocean (Ocean Drilling Program Leg 177, Site 1090) [J].

Anderson, LD ;

Delaney, ML .

PALEOCEANOGRAPHY, 2005, 20 (01) :1-13

[3] Origin, signature and palaeoclimatic influence of the Antarctic Circumpolar Current [J].

Barker, PF ;

Thomas, E .

EARTH-SCIENCE REVIEWS, 2004, 66 (1-2) :143-162

[4] Scotia Sea regional tectonic evolution: implications for mantle flow and palaeocirculation [J].

Barker, PF .

EARTH-SCIENCE REVIEWS, 2001, 55 (1-2) :1-39

[5] Significant Southern Ocean warming event in the late middle Eocene [J].

Bohaty, SM ;

Zachos, JC .

GEOLOGY, 2003, 31 (11) :1017-1020

[6] Bolboforma as monitors of Cenozoic palaeoceanographic changes in the Southern Ocean [J].

Cooke, PJ ;

Nelson, CS ;

Crundwell, MP ;

Spiegler, D .

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY, 2002, 188 (1-2) :73-100

[7] Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2 [J].

DeConto, RM ;

Pollard, D .

NATURE, 2003, 421 (6920) :245-249

[8]

DiesterHaass L, 1996, GEOLOGY, V24, P163, DOI 10.1130/0091-7613(1996)024<0163:EOTITS>2.3.CO

[9]

[10] Evolution of deepwater mixing and weathering inputs in the central Atlantic Ocean over the past 33 Myr -: art. no. 1091 [J].

Frank, M ;

van de Flierdt, T ;

Halliday, AN ;

Kubik, PW ;

Hattendorf, B ;

Günther, D .

PALEOCEANOGRAPHY, 2003, 18 (04) :15-1

← 1 2 3 4 →