The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263)
Received date: 2006-05-10
Revised date: 2006-06-10
Online published: 2006-08-15
he first continent-wide Antarctic ice sheet formed in the earliest Oligocene, during which the Earth underwent a great change from a non-glaciated planet to a polar glaciated planet. Recent investigations suggested that the mechanism of this climate transition has a close relationship with variations of ocean carbon reservoir and atmospheric CO2. The grain size variations of the carbonate ooze at ODP Site 1263 in South Atlantic revealed that a very strong carbonate dissolution event happened in the Earliest Oligocene. Leading the heaviest foraminiferal δ18O by 100 ka, the carbonate dissolution event started earlier than formation of the Antarctic ice sheet. The carbonate dissolution consumes lots of atmospheric CO2 and then transports the atmospheric CO2 into deep sea through the function of calcium pump. It could force and speed up the global cooling, and then the permanent ice sheet appeared on the eastern Antarctic.
Key words： Earliest oligocene; South Atlantic; ODP Site 1263.; Carbonate dissolution
Cheng Xin-rong , Tuo Shou-ting , Zhao Quan-hong , Liu Zhi-fei . The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263)[J]. Advances in Earth Science, 2006 , 21(8) : 800 -805 . DOI: 10.11867/j.issn.1001-8166.2006.08.0800
[1] Zachos J C, Quinn T M, Salamy K A. High-resolution (104 years) deep-sea foraminiferal stable isotope records of the Eocene-Oligocene climate transition[J]. Paleoceanography, 1996, 11: 251-266.
[2] Zachos J C, Stott L D, Lohmann K C. Evolution of early Cenozoic marine temperatures[J]. Paleoceanography, 1994, 9(2): 353-387.
[3] Kennett J P, Shackleton N J. Oxygen isotopic evidence for the development of the psychrosphere 38 Ma ago[J]. Science, 1976, 260: 513-515.
[4] Tripati A, Backman J, Elderfield H, et al. Eocene bipolar glaciation associated with global carbon cycle changes[J]. Nature, 2005, 436: 341-346.
[5] Lawver L A, Gahagan L M. Evolution of Cenozoic seaways in the circum-Antarctic region[J]. Palaeogeography, Palaeoclimatology, Palaeoecology, 2003, 198: 11-37.
[6] Coxall H K, Wilson P A, Palike H, et al. Rapid stepwise onset of Antarctic glaciation and deeper calcite compensation in the Pacific ocean[J]. Nature, 2005, 433: 53-57.
[7] Deconto R M, Pollard D. Rapid Cenozoic glaciation of Antarctica induced by declining atmospheric CO2[J]. Nature, 2003, 421: 245-249.
[8] Zachos J C, Kump L R. Carbon cycle feedbacks and the initiation of Antarctic glaciation in the earliest Oligocene[J]. Global and Planetary Change, 2005, 47: 51-66.
[9] Wang Pinxian, Tian Jun, Cheng Xinrong, et al. Exploring cyclic changes of the ocean carbon reservoir[J]. Chinese Science Bulletin, 2003, 48(23):2 356-2 548. [汪品先,田军,成鑫荣,等.探索大洋碳储库的演变周期[J].科学通报, 2003, 48 (21): 2 216-2 227.]
[10] Elderfield H. Carbonate mysteries[J]. Science, 2002, 296: 1 618-1 621.
[11] Broecker W S, Sanyal A. Magnitude of the CaCO3 dissolution events making the onset of times of glaciation[J]. Paleoceanography, 1997, 12: 530-532.
[12] Anderson D M, Archer D. Glacial-interglacial stability of ocean pH inferred from foraminifer dissolution rates[J]. Nature, 2002, 416:70-73.
[13] Shipboard Scientific Party. Leg 208 summary[C]∥Zachos J C, Kroon D, Blum P, et al. Proceeding Ocean Drilling Program Init Repts 208: College Station TX (Ocean Drilling Program), 2004:1-112.
[14] Tuo Shouting, Liu Zhifei, Zhao Quanhong, et al. The earliest Oligocene glacial maximum: Records from ODP site 1265, south Atlantic[J]. Earth Science,2006,31(2): 151-158. [拓守廷,刘志飞,赵泉鸿,等.渐新世初大冰期事件:南大西洋ODP 1265站的记录[J].地球科学,2006,31(2): 151-158.]
[15] Diester-Haass L. Middle Eocene to early Oligocene paleoceanography of the Antarctic Ocean (Maud Rise, ODP Leg 113, Site 689): Change from a low to high productivity ocean[J]. Palaeogeography, Palaeoclimatology, Palaeocology, 1995, 113: 311-334.
[16] Stuut J B, Prins M, Schneider R, et al. A 300-kyr record of aridity and wind strength in southwestern Africa: Inferences from grain-size distributions of sediments on Walvis ridge, SE Atlantic[J]. Marine Geology, 2002, 180: 221-233.
[17] Liu Zhifei, Xu Jian, Tian Jun, et al. Calcium carbonate pump during Quaternary glacial cycles in the south China sea[J]. Chinese Science Bulletin, 2003, 48(17): 1 862-1 869. [刘志飞,徐建,田军,等.南海第四纪冰期旋回中的碳酸钙泵[J].科学通报, 2003, 48(9): 962-968.]
[18] Treguer P, Pondaven P. Silica control of carbon dioxide[J]. Nature, 2000, 406: 358-359.
[19] Liu Zhifei, Tuo Shouting, Zhao Quanhong, et al. Deep sea-water earliest Oligocene glacial maxmiun in south Atlantic[J]. Chinese Science Bulletin,2004,49(20): 2 190-2 197.[刘志飞,拓守廷,赵泉鸿,等.南大西洋深水渐新世初大冰期事件[J].科学通报, 2004, 49 (17):1 793-1 800.]
/
| 〈 |
|
〉 |
甘公网安备62010202000687
