| DOI: | 10.1016/j.epsl.2017.11.018
|
| Scopus记录号: | 2-s2.0-85034994041
|
| 论文题名: | Rock erodibility and the interpretation of low-temperature thermochronologic data |
| 作者: | Flowers R.M.
|
| 刊名: | Earth and Planetary Science Letters
|
| ISSN: | 0012821X
|
| 出版年: | 2018
|
| 卷: | 482 | | 起始页码: | 312
|
| 结束页码: | 323
|
| 语种: | 英语
|
| 英文关键词: | (U–Th)/He
; AFT
; erosion models
; rock erodibility
; rock strength
; thermochronology
|
| Scopus关键词: | Buildings
; Cooling
; Erosion
; Rocks
; Sedimentology
; Temperature
; Alternating layers
; Erodibility
; Erosion models
; Orders of magnitude
; Precambrian basement
; Rock strength
; Sedimentary packages
; Thermochronology
; Sedimentary rocks
; erodibility
; erosion rate
; lithology
; low temperature
; numerical model
; rock mechanics
; temperature effect
; thermochronology
; Rocky Mountains
|
| 英文摘要: | Rocks vary significantly in strength and erodibility. Here we evaluate if rock erodibility variations should be considered when interpreting thermochronologic datasets. We do this by applying 1D thermo–kinematic numerical models that exhume two lithologies of contrasting erodibility. For thick layers (>2 km), soft over hard layering causes earlier cooling and therefore older thermochronologic dates than no layering, with the opposite true for hard over soft layering. In some circumstances, even 2–10x erodibility contrasts substantially influence the results, and a 10x erodibility contrast can be nearly as important as contrasts several orders of magnitude greater. Thinner alternating layers (<0.5 km) dramatically reduce the effect. The results imply that rock erodibility variations should not substantially influence thermochronologic data from most continental sedimentary packages, which are dominated by lithologic layering <0.5 km-thick. However, the effect may be important for data from basement samples exhumed beneath softer sedimentary rocks. For example, the abrupt cooling and erosion rate decrease recorded by thermochronologic data from Rocky Mountain basement uplifts of the western U.S. coincides with when erosion-resistant Precambrian basement was exposed after removal of softer sedimentary cover. These data may largely record a change in exposed rock type erodibility rather than a dramatic change in external erosional forcing. Our results suggest that in some cases, variations in rock erodibility should be considered when interpreting cooling and erosion histories from thermochronologic datasets. © 2017 Elsevier B.V. |
| Citation statistics: |
|
| 资源类型: | 期刊论文
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/110098
|
| Appears in Collections: | 影响、适应和脆弱性
气候变化事实与影响
|
|
There are no files associated with this item.
|
|
作者单位: | Department of Geological Sciences, University of Colorado Boulder, United States; Department of Geosciences, University of Tübingen, Tübingen, Germany
|
| Recommended Citation: | |
Flowers R.M.. Rock erodibility and the interpretation of low-temperature thermochronologic data[J]. Earth and Planetary Science Letters,2018-01-01,482
|
|
|