scholarly journals Late Quaternary Changes in the Kuroshio Current Due to Ryukyu-Taiwan Land Bridge Formation: Evidence from the Okinawa Trough Piston Cores.

1998 ◽  
Vol 37 (3) ◽  
pp. 243-249 ◽  
Author(s):  
Hiroshi Ujiié
Keyword(s):  
Late Quaternary ◽  
Okinawa Trough ◽  
Kuroshio Current ◽  
Land Bridge ◽  
Bridge Formation ◽  
The Okinawa Trough ◽  
The Kuroshio

A biomarker record of temperature and phytoplankton community structure in the Okinawa Trough since the last glacial maximum

2017 ◽  
Vol 88 (1) ◽  
pp. 89-97 ◽  
Author(s):  
Jiaping Ruan ◽  
Yunping Xu ◽  
Su Ding ◽  
Yinghui Wang ◽  
Xinyu Zhang
Keyword(s):  
Phytoplankton Community ◽  
Okinawa Trough ◽  
Kuroshio Current ◽  
Community Change ◽  
Community Structures ◽  
Ocean Drilling Program ◽  
The Holocene ◽  
The Okinawa Trough ◽  
The Kuroshio ◽  
The Last Glacial

AbstractA variety of biomarkers were examined from Ocean Drilling Program Core 1202B to reconstruct temperature and phytoplankton community structures in the southern Okinawa Trough since 20 ka. Two molecular temperature proxies ( $${\rm U}_{{37}}^{{{\rm K}\prime}} $$ and TEX86) show 5°C to ~6°C warming during the glacial-interglacial transition. Prior to the Holocene, the $${\rm U}_{{37}}^{{{\rm K}\prime}} $$ -derived temperature was generally 1°C to 4°C higher than TEX86-derived temperature. This difference, however, was reduced to <1°C in the Holocene. Correspondingly, the phytoplankton biomarkers (e.g., C37:2 alkenone, brassicasterol, C30 1,15 diol, and dinosterol) indicate a shift of planktonic community structures, with coccolithophorids becoming more abundant in the Holocene at the expense of diatoms/dinoflagellates. This shift is related to the variability of nutrients, temperature, and salinity in the Okinawa Trough, likely controlled by the sea level and the intensity of the Kuroshio Current. The phytoplankton community change may have had profound implications for atmospheric CO2 fluctuations during glacial-interglacial cycles since diatoms and dinoflagellates have a higher efficiency of the biological pump than coccolithophorids.

Variation in subsurface water temperature and its link to the Kuroshio Current in the Okinawa Trough during the last 38.5 kyr

2017 ◽  
Vol 452 ◽  
pp. 1-11 ◽  
Author(s):  
Yoshimi Kubota ◽  
Nozomi Suzuki ◽  
Katsunori Kimoto ◽  
Masao Uchida ◽  
Takuya Itaki ◽  
...  
Keyword(s):  
Water Temperature ◽  
Okinawa Trough ◽  
Kuroshio Current ◽  
Subsurface Water ◽  
The Okinawa Trough ◽  
The Kuroshio

scholarly journals The Holocene Pulleniatina Minimum Event revisited: Geochemical and faunal evidence from the Okinawa Trough and upper reaches of the Kuroshio current

2006 ◽  
Vol 59 (3-4) ◽  
pp. 153-170 ◽  
Author(s):  
Yu-Shih Lin ◽  
Kuo-Yen Wei ◽  
In-Tian Lin ◽  
Pai-Sen Yu ◽  
Hong-Wei Chiang ◽  
...  
Keyword(s):  
Okinawa Trough ◽  
Kuroshio Current ◽  
The Holocene ◽  
The Okinawa Trough ◽  
The Kuroshio

Holocene variability of the Kuroshio Current in the Okinawa Trough, northwestern Pacific Ocean

2000 ◽  
Vol 184 (1) ◽  
pp. 305-319 ◽  
Author(s):  
Zhimin Jian ◽  
Pinxian Wang ◽  
Yoshiki Saito ◽  
Jiliang Wang ◽  
Uwe Pflaumann ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Okinawa Trough ◽  
Kuroshio Current ◽  
Northwestern Pacific ◽  
Northwestern Pacific Ocean ◽  
The Okinawa Trough ◽  
The Kuroshio

scholarly journals Origin of Pumice in Sediments from the Middle Okinawa Trough: Constraints from Whole-Rock Geochemical Compositions and Sr-Nd-Pb Isotopes

2019 ◽  
Vol 7 (12) ◽  
pp. 462
Author(s):  
Xue Fang ◽  
Zhigang Zeng ◽  
Siyi Hu ◽  
Xiaohui Li ◽  
Zuxing Chen ◽  
...  
Keyword(s):  
Volcanic Activity ◽  
Lower Crust ◽  
Late Quaternary ◽  
Okinawa Trough ◽  
Volcanic Rocks ◽  
The Okinawa Trough ◽  
Primitive Magma ◽  
The Indian Ocean ◽  
Lower Crustal

Frequent volcanic activity has occurred in the Okinawa Trough (OT) during the late Quaternary, which attracted much attention to the origin of volcanic rocks. Pumice collected from the seafloor has been extensively investigated, whereas few studies paid attention to the pumice in the sediment. The geochemical compositions of pumice preserved in sediments generally provide insight into past volcanic activity and regional magmatism. Here, we present major and trace element compositions and Sr-Nd-Pb isotope data, together with the established age framework for pumice samples recovered from sediment core S9 in the middle OT (MOT) to investigate their possible formation. Compositionally, the S9 pumice samples are dacite and are characterized by relatively higher Sr (87Sr/86Sr = 0.70480–0.70502) and Pb (206Pb/204Pb = 18.321-18.436, 207Pb/204Pb = 15.622–15.624, and 208Pb/204Pb = 38.52–38.63) and lower Nd (143Nd/144Nd = 0.51272–0.51274) isotope compositions than basalts from the MOT. The geochemical compositions of pumice clasts from different layers of core S9 display no temporal variation trends and vary within narrow ranges. On the basis of the geochemical characteristics of S9 pumice samples, we infer that the parent magma of these samples might generate from hybrid magma through an extensive fractional crystallization process. The Indian Ocean MORB-type mantle was first metasomatized by the subducted Philippine Sea sediments to form the primitive magma; then, followed by assimilation of a small amount of lower crustal component occurred in the lower crust. The long-term magmatism and relatively consistent isotopic compositions indicate that a magma chamber might have existed in the lower crust of the MOT between 11.22 and 12.96 cal. ka BP.

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