北极冰盖形成对东西太平洋及边缘海古海洋学演化的影响<sup>*</sup>

doi:10.7605/gdlxb.2011.03.010

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Abstract The most important palaeoclimate event in the Pliocene is the formation and expansion of the Arctic Icecap during 3.2-2.5 Ma.We obtained δ¹⁸O(oxygen isotopes)，δ¹³C(carbon isotope)record data of planktonic foraminifera Globigerinoides ruber and Pulleniatina obliquiloculata from the Pliocene-Early Pleistocene interval(4.5-1.6Ma)in ODP807A in the Western Pacific Warm Pool.Based on the formation process of the Arctic Icecap，the above data can be divided into three stages: prior to Icecap formation(4.5-3.2Ma)，during Icecap formation(3.2-2.5Ma)and after Icecap formation(2.5-1.6Ma).The results show that since the Icecap formation，δ¹⁸O values in both G.ruber and P.obliquiloculata showed increasing trend，respectively indicating the continuous temperature decrease in the surface and subsurface in the Warm Pool.During the Icecap formation，the δ¹⁸O value of G.ruber changed little，but that of P.obliquiloculata was heavier，which indicate that the subsurface was affected more strongly by Icecap formation.The δ¹⁸O difference between P.obliquiloculata and G.ruber(or Δδ¹⁸O_（P-G）） reflects little change in the depth of thermocline，implying a very weak influence from the Icecap formation.According to the Mg/Ca value from ODP806(Wara et al.，2005)and U^K′₃₇ value from ODP 847(Herbert and Laura，2010)，both the surface temperature of western Pacific Ocean and the eastern Pacific Ocean decreased since the Arctic Icecap formation，and a greater range of the eastern Pacific.Compared with Δδ¹⁸O_(P-G) from the western Pacific ODP807A with Δδ¹⁸O_(T-S) from the eastern Pacific ODP847 at the same period，the eastern Pacific thermocline changed shallowing，suggesting the gradient of the depth of thermocline between the western and eastern Pacific enlarged.Compared δ¹⁸O and δ¹³C value between G.rubber and P.obliquiloculata at Site 1143 and Site 1148, it also indicated that the surface temperature and the productivity level were more evidently affected in the northern(Site 1148)than in the southern South China Sea(Site 1143).

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	Guo Jianqing
	Cheng Xinrong
	Chen Ronghua

Key words： Western Pacific Warm Pool oxygen isotope value carbon isotope value Arctic Icecap formation thermocline depth

Received: 31 August 2010 Published: 01 June 2011

ZTFLH:

P736.4

About author: Guo Jianqing，born in 1979，is a Ph.D. candidate in China University of Petroleum(East China).Now，she is mainly engaged in sequence stratigraphy and marine geology.E-mail: qingbdq@126.com.
About the corresponding author Cheng Xinrong，born in 1953，is a professor in Tongji University，and is mainly engaged in researches and teaching in mini-fossil and palaeoenvironment.E-mail: xrchengk@online.sh.cn.

Cite this article:

Guo Jianqing,Cheng Xinrong,Chen Ronghua. Response of palaeooceanography evolution of eastern and western Pacific Ocean and marginal sea to the Arctic Icecap formation[J]. JOURNAL OF PALAEOGEOGRAPHY, 2011, 13(3): 334-346.

Guo Jianqing,Cheng Xinrong,Chen Ronghua. Response of palaeooceanography evolution of eastern and western Pacific Ocean and marginal sea to the Arctic Icecap formation[J]. JOPC, 2011, 13(3): 334-346.

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http://journal09.magtechjournal.com/gdlxb/EN/10.7605/gdlxb.2011.03.010 OR http://journal09.magtechjournal.com/gdlxb/EN/Y2011/V13/I3/334

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