DOI: 10.1016/j.epsl.2018.08.058
Scopus记录号: 2-s2.0-85053757847
论文题名: When do mantle plumes destroy diamonds?
作者: Ernst R.E. ; Davies D.R. ; Jowitt S.M. ; Campbell I.H.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 502 起始页码: 244
结束页码: 252
语种: 英语
英文关键词: diamond window
; kimberlite
; large igneous province
; lithosphere
; mantle plume
Scopus关键词: Diamond deposits
; Diamonds
; Geochronology
; Minerals
; Structural geology
; Thermal plumes
; Volcanic rocks
; Diamond window
; kimberlite
; Large igneous provinces
; lithosphere
; Mantle plume
; Economic geology
; Archean
; comparative study
; core-mantle boundary
; craton
; diamond
; geochronology
; kimberlite
; large igneous province
; lithospheric structure
; mantle plume
; model test
; P-T conditions
; thermal structure
; thermochronology
; Russian Federation
; Siberian Craton
英文摘要: Mantle plumes are hot buoyant upwellings that rise from Earth's core–mantle-boundary to its surface where they can produce large igneous provinces (LIPs) and volcanic tracks, such as the Siberian Traps and the Hawaiian Emperor chain, respectively. We show that flattened mantle plume heads, which can have radii of >1200 km in the uppermost mantle, can heat the overlying lithospheric mantle to temperatures above the diamond stability field. As a consequence, they can destroy diamonds within the roots of Archean cratons, the principal source of diamonds in kimberlites. We quantitatively demonstrate that there is a ‘sour spot’ for this effect that occurs when lithospheric thicknesses are 165–185 km and the plume has a temperature of >150 °C above background mantle. Our model explains why the kimberlites associated with the 370 Ma Yakutsk–Vilyui plume in the Siberian craton are diamondiferous whilst those associated with the younger 250 Ma Siberian Traps plume are barren. We also show that the time required to restore the pre-plume thermal structure of the lithosphere is ca. 75–120 Myr, and that destroyed diamonds may regrow once the plume's thermal effect dissipates. The 1100 Ma Kyle Lake and adjacent 180–150 Ma Attawapiskat kimberlites in the southern Superior craton exemplify this, where the older kimberlites are associated with a narrower diamond window (<30 km) in comparison with the ca. 85 km diamond window of the younger Attawapiskat field. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109653
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Earth Sciences, Carleton University, Ottawa, ON K1S 5B6, Canada; Faculty of Geology and Geography, Tomsk State University, Tomsk, 634050, Russian Federation; Research School of Earth Sciences, The Australian National University, Canberra, Australia; Department of Geoscience, University of Nevada, Las Vegas, 4505 S. Maryland Pkwy., Las Vegas, NV 89154-4010, United States
Recommended Citation:
Ernst R.E.,Davies D.R.,Jowitt S.M.,et al. When do mantle plumes destroy diamonds?[J]. Earth and Planetary Science Letters,2018-01-01,502