陈萌莎, 黄宝琦. 早第四纪西太平洋底栖有孔虫群与大洋深层水环流演化的关系[J]. 海洋地质与第四纪地质, 2012, 32(4): 97-105. DOI: 10.3724/SP.J.1140.2012.04097
引用本文: 陈萌莎, 黄宝琦. 早第四纪西太平洋底栖有孔虫群与大洋深层水环流演化的关系[J]. 海洋地质与第四纪地质, 2012, 32(4): 97-105. DOI: 10.3724/SP.J.1140.2012.04097
CHEN Mengsha, HUANG Baoqi. EVOLUTION OF EARLY PLEISTOCENE DEEP WATER CIRCULATION IN WESTERN PACIFIC: EVIDENCE FROM BENTHIC FORAMINIFERA[J]. Marine Geology & Quaternary Geology, 2012, 32(4): 97-105. DOI: 10.3724/SP.J.1140.2012.04097
Citation: CHEN Mengsha, HUANG Baoqi. EVOLUTION OF EARLY PLEISTOCENE DEEP WATER CIRCULATION IN WESTERN PACIFIC: EVIDENCE FROM BENTHIC FORAMINIFERA[J]. Marine Geology & Quaternary Geology, 2012, 32(4): 97-105. DOI: 10.3724/SP.J.1140.2012.04097

早第四纪西太平洋底栖有孔虫群与大洋深层水环流演化的关系

EVOLUTION OF EARLY PLEISTOCENE DEEP WATER CIRCULATION IN WESTERN PACIFIC: EVIDENCE FROM BENTHIC FORAMINIFERA

  • 摘要: 选取赤道西太平洋ODP 807站位(3°36.42'N,156°37.49'E,水深2 803.8 m,岩心长822.9 m)26.27~43.02 mbsf层段中的底栖有孔虫进行研究,以便了解早更新世2.5~1.6 Ma BP时期古生产力和深水环流的变化。结果显示,这一时期底栖有孔虫堆积速率(BFAR)、表生种和内生种比值(E/I)、Uvigerina spp.百分含量和有机碳百分含量(TOC%)等替代指标反映了西太平洋古生产力总体上呈现冰期高、间冰期低的特点,而其中Bulimina alazanensis的丰度变化则相反,反映了该种有可能更适合温暖、低营养的底层水环境。2.5~1.6 MaBP时期底栖有孔虫在丰度上以Uvigerina spp.为主,指示了早更新世西太平洋深层水受北部水团的控制更强。

     

    Abstract: Benthic foraminifera picked out from the interval of 43.02~26.27 mbsf (meters below seafloor) of ODP 807(3°36.42'N,156°37.49'E,water depth 2 803.8 m,length 822.9 m)on the Ontong-Java Plateau, western Pacific was studied for understanding the changes in paleoproductivity and its relation with deep water circulation during the period of 2.5~1.6 MaBP. The benthic foraminifera accumulation rate (BFAR), Epifaunal/Infaunal ratio (E/I), percentage of Uvigerina spp. and total organic carbon (TOC%) were used as the proxies of paleoproductivity in this study. Results show that the change in paleoproductivity was generaly high in glacials but low in interglacials during the period of 2.5~1.6 MaBP., except Bulimina alazanensis, of which the paleopruductivity was low in glacials but high in interglacials. It may suggest that B. alazanensis, opposite to the others, preferred a warmer environment with lower nutrients. The benthic foraminiferal fauna was dominated by Uvigerina spp. in the samples, indicating that the western Pacific deep water was under the control of the North Pacific Deep Water Mass during Early Pleistocene.

     

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