1994 Fiscal Year Final Research Report Summary
TROPOSPHERIC EOLIAN DUST ORIGIN OF RED-YELLOW SOILS IN NANSEI-SYOTO
| Project/Area Number |
05453156
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Plant nutrition/Soil science
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| Research Institution | IWATE UNIVERSITY |
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Principal Investigator |
INOUE Katsuhiro IWATE UNIVERSITY FACULTY OF AGRICULTURE,DEPARTMENT OF AGRONOMY AND FORESTRY,PROFESSOR, 農学部・農林生産学科, 教授 (30035109)
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| Project Period (FY) |
1993 – 1994
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| Keywords | NANSEI-SYOTO / RED-YELLOW SOILS / EOLIAN DUST / QUARTZ / OXYGEN ISOTOPIC RATIO / CLAY MINERAL / PALEOENVIRONMENT / THE LAST GLACIAL STAGE |
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| Research Abstract |
Oxygen and carbon isotopic studies of the Red and Yellow soil Group, Quaternary and Paleozoic phyllite in the Nansei Syoto and piston cores in the Okinawa Trough, the Nansei Syoto Trench, and the Amami Plateau were carried out. The oxygen and carbon isotopic rations of quartz, muscovite and calcite indicated that quartz and muscovite were of eolian dust origin.
Analytical data of the Iwate volcano tephra deposits after the fall of the Toya Ash (90-130ka) indicated that eolian dust was mainly deposited 20-34ka and 50-70ka and that the flux of eolian dust during the late period of the Last Glacial age was estimated to be 4cm/1,000 years. The changes of vegetation and climate were also estimated by using opal phytolith composition and eolian dust content.
The recent rainwater in the central and northern regions of China shows higher pH values and Ca concentrations than southern region of China. Our data showed that calcite in the eolian dust was consumed to neutralize acidic components in Chinese and Korean rainwater. Recent eolian dust transported from China to Japan contains a small amount of calcite, suggesting that it has a low neutralization capacity to acid rain in Japan.
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Research Products
(11 results)
