DOI: 10.1016/j.epsl.2018.05.043
Scopus记录号: 2-s2.0-85047995291
论文题名: A Neogene history of mantle convective support beneath Borneo
作者: Roberts G.G. ; White N. ; Hoggard M.J. ; Ball P.W. ; Meenan C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 496 起始页码: 142
结束页码: 158
语种: 英语
英文关键词: Borneo
; inverse modeling
; mantle convection
; Neogene
; river profiles
; uplift
Scopus关键词: Acoustic wave velocity
; Air
; Deposition
; Geodynamics
; Inverse problems
; Rivers
; Shear waves
; Tectonics
; Wave propagation
; Borneo
; Inverse modeling
; Mantle convection
; Neo genes
; River profile
; uplift
; Shear flow
英文摘要: Most, but not all, geodynamic models predict 1–2 km of mantle convective draw-down of the Earth's surface in a region centered on Borneo within southeast Asia. Nevertheless, there is geomorphic, geologic and geophysical evidence which suggests that convective uplift might have played some role in sculpting Bornean physiography. For example, a long wavelength free-air gravity anomaly of +60 mGal centered on Borneo coincides with the distribution of Neogene basaltic magmatism and with the locus of sub-plate slow shear wave velocity anomalies. Global positioning system measurements, an estimate of elastic thickness, and crustal isostatic considerations suggest that regional shortening does not entirely account for kilometer-scale regional elevation. Here, we explore the possible evolution of the Bornean landscape by extracting and modeling an inventory of 90 longitudinal river profiles. Misfit between observed and calculated river profiles is minimized by smoothly varying uplift rate as a function of space and time. Erosional parameters are chosen by assuming that regional uplift post-dates Eocene deposition of marine carbonate rocks. The robustness of this calibration is tested against independent geologic observations such as thermochronometric measurements, offshore sedimentary flux calculations, and the history of volcanism. A calculated cumulative uplift history suggests that kilometer-scale Bornean topography grew rapidly during Neogene times. This suggestion is corroborated by an offshore Miocene transition from carbonate to clastic deposition. Co-location of regional uplift and slow shear wave velocity anomalies immediately beneath the lithospheric plate implies that regional uplift could have been at least partly generated and maintained by temperature anomalies within an asthenospheric channel. © 2018 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109802
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 Earth Science and Engineering, Imperial College London, London, United Kingdom; Bullard Laboratories, Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
Recommended Citation:
Roberts G.G.,White N.,Hoggard M.J.,et al. A Neogene history of mantle convective support beneath Borneo[J]. Earth and Planetary Science Letters,2018-01-01,496