scholarly journals Alkaline leaching characteristics of biogenic opal in IODP drilled cores from the Bering Sea

10.5109/21003 ◽  
2012 ◽  
Vol 32 (4) ◽  
pp. 39-44
Author(s):  
Shinya Iwasaki ◽  
Kozo Takahashi ◽  
Yoshiyuki Kanematsu
Keyword(s):  
Bering Sea ◽  
Alkaline Leaching ◽  
Biogenic Opal ◽  
Leaching Characteristics ◽  
The Bering Sea

Paleoproductivity and paleoceanography of the last 4.3 Myrs at IODP Expedition 323 Site U1341 in the Bering Sea based on biogenic opal content

2016 ◽  
Vol 125-126 ◽  
pp. 145-154 ◽  
Author(s):  
Shinya Iwasaki ◽  
Kozo Takahashi ◽  
Yoshiyuki Kanematsu ◽  
Hirofumi Asahi ◽  
Jonaotaro Onodera ◽  
...  
Keyword(s):  
Bering Sea ◽  
Biogenic Opal ◽  
The Bering Sea

Biogenic opal production changes during the Mid-Pleistocene Transition in the Bering Sea (IODP Expedition 323 Site U1343)

2014 ◽  
Vol 81 (1) ◽  
pp. 151-157 ◽  
Author(s):  
Sunghan Kim ◽  
Kozo Takahashi ◽  
Boo-Keun Khim ◽  
Yoshihiro Kanematsu ◽  
Hirofumi Asahi ◽  
...  
Keyword(s):  
Bering Sea ◽  
North Pacific ◽  
Accumulation Rate ◽  
Diatom Species ◽  
Biogenic Opal ◽  
Export Production ◽  
Wavelet Transform Analysis ◽  
Climate Cooling ◽  
Mass Accumulation ◽  
The Bering Sea

AbstractBiogenic opal content and mass accumulation rate (MAR) at IODP Expedition 323 Site U1343 were found to fluctuate consistently, generally being high under warm conditions and low under cold conditions during the last 2.4 Ma. Continuous wavelet transform analysis of the normalized biogenic opal content indicates that export production in the Bering Sea varied predominantly at 41-ka periodicity before 1.25 Ma, and shifted to 100-ka periodicity at the onset of the Mid-Pleistocene Transition (MPT; 1.25–0.7 Ma). The 100-ka cycles dominated until the Holocene. Export production in the Bering Sea decreased markedly in the Bering Sea two times during the MPT: the first occurred at the beginning of the MPT (1.25 Ma) and the second in the middle of the MPT (0.9 Ma). These decreases coincided with both increases in the relative abundance of sea-ice diatoms and decreases in the warm-water diatom species Neodenticula seminae, indicating that reductions in export production in the Bering Sea during the MPT were associated with climate cooling. Decreases in export production in the Bering Sea during the MPT were most likely associated with the increased influence of polar/Arctic domains on the high-latitude North Pacific.

Alkaline leaching characteristics of biogenic opal in Eocene sediments from the central Arctic Ocean: a case study in the ACEX cores

2014 ◽  
Vol 70 (3) ◽  
pp. 241-249 ◽  
Author(s):  
Shinya Iwasaki ◽  
Kozo Takahashi ◽  
Yusuke Ogawa ◽  
Seiichiro Uehara ◽  
Christoph Vogt
Keyword(s):  
Arctic Ocean ◽  
Central Arctic Ocean ◽  
Alkaline Leaching ◽  
Biogenic Opal ◽  
Leaching Characteristics

Changes in biogenic opal productivity with Milankovitch cycles during the last 1.3 Ma at IODP Expedition 323 Sites U1341, U1343, and U1345 in the Bering Sea

2013 ◽  
Vol 310 ◽  
pp. 213-220 ◽  
Author(s):  
Yoshiyuki Kanematsu ◽  
Kozo Takahashi ◽  
Sunghan Kim ◽  
Hirofumi Asahi ◽  
Boo-Keun Khim
Keyword(s):  
Bering Sea ◽  
Milankovitch Cycles ◽  
Biogenic Opal ◽  
The Bering Sea

Preliminary isopach map of the Bering Sea basin

1976 ◽  
Author(s):  
Alan K. Cooper ◽  
K.A. Bailey ◽  
M. S. Marlow ◽  
D. W. Scholl ◽  
C.E. Carpenter
Keyword(s):  
Bering Sea ◽  
Isopach Map ◽  
The Bering Sea
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