TY - JOUR
T1 - Bering Sea radiolarian biostratigraphy and paleoceanography at IODP Site U1341 during the last four million years
AU - Ikenoue, Takahito
AU - Okazaki, Yusuke
AU - Takahashi, Kozo
AU - Sakamoto, Tatsuhiko
N1 - Funding Information:
We are grateful to the fellow scientists and crewmembers of IODP Expedition 323 of D/V JOIDES Resolution for their efforts to obtain the high quality sediment samples and shipboard data in the Bering Sea. We also thank the IODP Exp. 323 counterpart Co-Chief Scientist Prof. Christina Ravelo of Univ. California, Santa Cruz, for support throughout all the phase of this work including editing of the manuscript. The samples used in this study were curated and provided by the IODP and Kochi Core Center. This manuscript was greatly improved by critical comments from reviewers Dr. Kjell R. Bjørklund and Dr. Paulian Dumitrica. This work was supported by JSPS KAKENHI Grant number 24310019 to YO and KT and JSPS KAKENHI Grant number 24•4155 and 26740006 to TI. TI received partial fund from Tatsuro Matsumoto Scholarship Fund of the Kyushu University.
Funding Information:
We are grateful to the fellow scientists and crewmembers of IODP Expedition 323 of D/V JOIDES Resolution for their efforts to obtain the high quality sediment samples and shipboard data in the Bering Sea. We also thank the IODP Exp. 323 counterpart Co-Chief Scientist Prof. Christina Ravelo of Univ. California, Santa Cruz, for support throughout all the phase of this work including editing of the manuscript. The samples used in this study were curated and provided by the IODP and Kochi Core Center. This manuscript was greatly improved by critical comments from reviewers Dr. Kjell R. Bj?rklund and Dr. Paulian Dumitrica. This work was supported by JSPS KAKENHI Grant number 24310019 to YO and KT and JSPS KAKENHI Grant number 24?4155 and 26740006 to TI. TI received partial fund from Tatsuro Matsumoto Scholarship Fund of the Kyushu University.
Funding Information:
We are grateful to the fellow scientists and crewmembers of IODP Expedition 323 of D/V JOIDES Resolution for their efforts to obtain the high quality sediment samples and shipboard data in the Bering Sea. We also thank the IODP Exp. 323 counterpart Co-Chief Scientist Prof. Christina Ravelo of Univ. California, Santa Cruz, for support throughout all the phase of this work including editing of the manuscript. The samples used in this study were curated and provided by the IODP and Kochi Core Center. This manuscript was greatly improved by critical comments from reviewers Dr. Kjell R. Bjørklund and Dr. Paulian Dumitrica. This work was supported by JSPS KAKENHI Grant number 24310019 to YO and KT and JSPS KAKENHI Grant number 24•4155 and 26740006 to TI. TI received partial fund from Tatsuro Matsumoto Scholarship Fund of the Kyushu University .
Publisher Copyright:
© 2015 Elsevier Ltd.
PY - 2016/3/1
Y1 - 2016/3/1
N2 - Radiolarian assemblages in sediment cores were investigated at the Integrated Ocean Drilling Program Site U1341 on Bowers Ridge in the southern Bering Sea. Radiolarian biozones at Site U1341 spanned the last 4 My from the youngest Amphimelissa setosa Zone (late Quaternary), via the Stylatractus universes Zone, the Eucyrtidium matuyamai Zone and a part of the Cycladophora sakaii Zone (middle to late Pliocene). The A. setosa Zone, newly proposed in this paper, is well correlated with the Botryostrobus aquilonaris Zone in the North Pacific Ocean. The bottom of the S. universus and top of the E. matuyamai Zones are emended in this paper by using the first common occurrence of A. setosa. Seventeen radiolarian datum points were identified at Site U1341 and tied to the geomagnetic and oxygen isotope stratigraphy. Radiolarian assemblages during the last 4 My showed a turnover from subarctic-transitional species (Spongopyle osculosa and Larcopyle buetschlii) to subarctic species (Ceratospyris borealis) between 3.6 and 2.4 Ma, corresponding to the intensification of the Northern Hemisphere Glaciation (NHG). Recent polar species (A. setosa and Actinomma boreale) appeared abundantly after the Mid-Pleistocene Transition (MPT, 1.2-0.8 Ma). Repeated numbers of individual peaks of the abundances of Cycladophora davisiana, dwelling in cold and well-ventilated intermediate water, suggest intermediate to deep water formation in the Bering Sea during the last 1 My.
AB - Radiolarian assemblages in sediment cores were investigated at the Integrated Ocean Drilling Program Site U1341 on Bowers Ridge in the southern Bering Sea. Radiolarian biozones at Site U1341 spanned the last 4 My from the youngest Amphimelissa setosa Zone (late Quaternary), via the Stylatractus universes Zone, the Eucyrtidium matuyamai Zone and a part of the Cycladophora sakaii Zone (middle to late Pliocene). The A. setosa Zone, newly proposed in this paper, is well correlated with the Botryostrobus aquilonaris Zone in the North Pacific Ocean. The bottom of the S. universus and top of the E. matuyamai Zones are emended in this paper by using the first common occurrence of A. setosa. Seventeen radiolarian datum points were identified at Site U1341 and tied to the geomagnetic and oxygen isotope stratigraphy. Radiolarian assemblages during the last 4 My showed a turnover from subarctic-transitional species (Spongopyle osculosa and Larcopyle buetschlii) to subarctic species (Ceratospyris borealis) between 3.6 and 2.4 Ma, corresponding to the intensification of the Northern Hemisphere Glaciation (NHG). Recent polar species (A. setosa and Actinomma boreale) appeared abundantly after the Mid-Pleistocene Transition (MPT, 1.2-0.8 Ma). Repeated numbers of individual peaks of the abundances of Cycladophora davisiana, dwelling in cold and well-ventilated intermediate water, suggest intermediate to deep water formation in the Bering Sea during the last 1 My.
UR - http://www.scopus.com/inward/record.url?scp=84930449757&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84930449757&partnerID=8YFLogxK
U2 - 10.1016/j.dsr2.2015.03.004
DO - 10.1016/j.dsr2.2015.03.004
M3 - Article
AN - SCOPUS:84930449757
SN - 0967-0645
VL - 125-126
SP - 38
EP - 55
JO - Deep-Sea Research Part II: Topical Studies in Oceanography
JF - Deep-Sea Research Part II: Topical Studies in Oceanography
ER -