2015 Fiscal Year Final Research Report
Modeling of fracturing induced by hydration and hydration reactions
| Project/Area Number |
26610169
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Petrology/Mineralogy/Economic geology
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
SHIMIZU Hiroyuki 東北大学, 流体科学研究所, 助教 (60610178)
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Keywords | 離散要素法 / 破壊－反応―流体流動 / 加水反応・脱水反応 / フラクチャーパターン / フィードバック / 蛇紋岩化作用 / 変成作用 / 地球内部の水循環 |
|---|
| Outline of Final Research Achievements |
Hydration and dehydration of rocks play crucial roles on global circulation of H2O in the Earth’s interior. It is known that these reactions commonly proceed with fracturing, but the detailed mechanism is still poorly understood. In this study, based on a distinct element method, we succeeded in making a novel model for the coupled processes of surface reaction-fluid flow-fracturing. We revealed that typical prograde metamorphism (volume-decreasing dehydration) and retrograde metamorphism (volume-increasing hydration) produce contrasting fracture patterns mainly induced by stress fields due to the solid volume change. Such a feedback also controls the effective reaction rate of serpentinization within the oceanic lithosphere.
|
| Free Research Field |
岩石学
|
