WEATHERING AND DENUDATION RATES OF LIMESTONES AND FORMATIVE PROCESSES OF KARST LANDFORMS
| Project/Area Number |
19300305
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Geography
|
|---|
| Research Institution | University of Tsukuba |
|---|
Principal Investigator |
MATSUKURA Yukinori University of Tsukuba, 大学院・生命環境科学研究科, 教授 (80107341)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
MATSUZAKI Hiroyuki 東京大学, 大学院・工学研究科, 准教授 (60313194)
HATTANJI Tsuyoshi 筑波大学, 大学院・生命環境科学研究科, 講師 (00418625)
AOKI Hisashi 大東文化大学, 経営学部, 講師 (30423742)
|
|---|
| Project Period (FY) |
2007 – 2009
|
| Project Status |
Completed (Fiscal Year 2009)
|
| Budget Amount *help |
¥14,820,000 (Direct Cost: ¥11,400,000、Indirect Cost: ¥3,420,000)
Fiscal Year 2009: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2008: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2007: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
|
|---|
| Keywords | 地形 / 風化 / 石灰岩 / 削剥 / カルスト地形 / 風化速度 |
|---|
| Research Abstract |
This study attempted to quantify long-term subaerial denudation of bare carbonate rock surfaces by using in situ-produced cosmogenic ^<36>Cl in calcite. Carbonate samples were collected from the topmost 5cm of exposed pinnacles at several non-glaciated karst areas in subtropical to subarctic regions in Japan. Concentrations of natural Cl and ^<36>Cl in calcite were determined by accelerator mass spectrometry with isotope dilution with ^<35>Cl-enriched carrier spike. The nuclide concentrations were of the order of 10^5-10^6 atom g^<-1>, and converted to total denudation rates averaged over a 10^5 yr-timescale of chemical and physical processes acting on the karst surfaces. The denudation rates were 20-60mm kyr<-1>, being lowest in the central part of Japan. This tendency indicates the alternation of relative importance of chemical (dissolution) and physical (frost shattering) processes in denudation, depending on site-specific factors such as mean temperature, annual precipitation, and freeze-thawing intensity.
|
Report
(4 results)
Research Products
(27 results)
-
-
[Journal Article] Denudation rates of carbonate pinnacles in Japanese karst areas : estimates from cosmogenic ^<36>Cl in calcite2010
Author(s)
Matsushi, Y., Sasa, K., Takahashi, T., Sueki, K., Nagashima, Y., Matsukura, Y.
-
Journal Title
Nuclear Instruments and Methods in Physics Research B 268巻, Issues 7-8
Pages: 1205-1208
Related Report
Peer Reviewed
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
