| 项目编号: | 1524578
|
| 项目名称: | Collaborative Research: Tectonic Significance of Long Run-Out Coarse-Grained Facies in the Cordilleran Foreland Basin |
| 作者: | John Geissman
|
| 承担单位: | University of Texas at Dallas
|
| 批准年: | 2014
|
| 开始日期: | 2015-07-15
|
| 结束日期: | 2018-06-30
|
| 资助金额: | USD112253
|
| 资助来源: | US-NSF
|
| 项目类别: | Continuing grant
|
| 国家: | US
|
| 语种: | 英语
|
| 特色学科分类: | Geosciences - Earth Sciences
|
| 英文关键词: | coarse-grained
; lag-time
; basin
; fine-grained
; thrust belt
; coarse-grained sediment
; basin fill
; distal coarse-grained facy
; societal outcome
; foreland setting
; foreland basin
; basin stratigrapher
; foreland basin host important hydrocarbon resource
; tectonic growth
; fine-grained distal sedimentation
; long lag-time
; tectonic event
; coarse-grained distal facy
; fine-grained sediment
; foreland basin subsidence
; irregular long-term trend
; classic foreland
; fine-grained interbed
; upper cretaceous foreland basin deposit
; coarse-grained interval
; distal basin
; syntectonic response
; basin development
; research project
; record tectonic growth
|
| 英文摘要: | Sediments deposited in basins in front of fold-and-thrust belts, also known as foreland basins, record the tectonic growth and development of the belts. One prevalent model for sedimentation in these basins is that fine-grained sediments in record tectonic growth of the thrust belt whereas coarse-grained sediments accumulate during periods of thrust belt inactivity. This project aims to test this model using innovative methods to determine the timing of sedimentation in the Idaho-Wyoming fold-and-thrust belt. A successful challenge of the prevalent model has the potential to change geological understanding of how fold-and-thrust belts belts develop. This is of particular importance because the Idaho-Wyoming thrust belt and associated foreland basins host important hydrocarbon resources. A better understanding of basin development will provide important insights into hydrocarbon exploration. The project would advance other desired societal outcomes through: (1) full participation of women in STEM; (2) improved STEM education and educator development through engagement of a K-12 science teacher or undergrad student in the UTeach program, and participation in the Geoscience Teacher Symposium for K-12 science teachers; (3) increased public scientific literacy and public engagement with STEM through development of displays and videos for the University of Arizona Flandau Center; and (4) development of a globally competitive STEM workforce through training of graduate and undergraduate students.
For over two decades foreland basin stratigraphers and sedimentologists have used the two-phase model of foreland basin subsidence to interpret stratigraphic sequences in foreland settings. This model hypothesizes that episodes of fine-grained distal sedimentation are the syntectonic response to orogenic growth and rapid flexural subsidence, whereas coarse-grained distal facies accumulate during periods of thrust belt inactivity, erosion, and isostatic rebound. This research project will test this model using geo/thermochronologic and magnetic polarity stratigraphic study of mid- to Upper Cretaceous foreland basin deposits in northeast Utah and southwest Wyoming, a classic foreland. Detrital geochronology (U-Pb on detrital zircon and apatite) and thermochronology (apatite fission track) will determine detrital lag-times (the time difference between the exhumation age of a sediment grain from the source terrane and its depositional age in the basin). Second, better age control in the poorly dated proximal part of the basin fill will be established by using magnetic polarity stratigraphy on fine-grained interbeds within thick alluvial fan deposits located adjacent to major thrust faults. This combined approach allows accurate correlation of the proximal and distal facies, and establishment of the time difference between exhumation and depositional ages of the distal, coarse-grained intervals. Long lag-times in the distal coarse-grained facies and irregular long-term trends in lag-time, this would support the two-phase model whereas relatively brief (<5 Myr) lag-times and a steady to decreasing lag time trend would indicate that coarse-grained sediments prograded directly into the distal basin during tectonic events in the thrust belt and therefore would nullify the two-phase model. |
| 资源类型: | 项目
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/93991
|
| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
John Geissman. Collaborative Research: Tectonic Significance of Long Run-Out Coarse-Grained Facies in the Cordilleran Foreland Basin. 2014-01-01.
|
|
|