DOI: 10.1016/j.epsl.2017.10.031
Scopus记录号: 2-s2.0-85033607237
论文题名: Plate tectonics and continental basaltic geochemistry throughout Earth history
作者: Keller B. ; Schoene B.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 481 起始页码: 290
结束页码: 304
语种: 英语
英文关键词: geochemistry
; petrology
; plate tectonics
Scopus关键词: Basalt
; Gallium
; Geochemistry
; Geodynamics
; Melting
; Minerals
; Niobium
; Petrology
; Titanium
; Trace elements
; Average composition
; Bootstrap resampling
; Element concentrations
; Geochemical modeling
; Geological heterogeneities
; Incompatible element
; Potential temperature
; Trace element partitioning
; Tectonics
; basalt
; concentration (composition)
; igneous geochemistry
; magma
; mantle structure
; partial melting
; petrology
; plate tectonics
英文摘要: Basaltic magmas constitute the primary mass flux from Earth's mantle to its crust, carrying information about the conditions of mantle melting through which they were generated. As such, changes in the average basaltic geochemistry through time reflect changes in underlying parameters such as mantle potential temperature and the geodynamic setting of mantle melting. However, sampling bias, preservation bias, and geological heterogeneity complicate the calculation of representative average compositions. Here we use weighted bootstrap resampling to minimize sampling bias over the heterogeneous rock record and obtain maximally representative average basaltic compositions through time. Over the approximately 4 Ga of the continental rock record, the average composition of preserved continental basalts has evolved along a generally continuous trajectory, with decreasing compatible element concentrations and increasing incompatible element concentrations, punctuated by a comparatively rapid transition in some variables such as La/Yb ratios and Zr, Nb, and Ti abundances approximately 2.5 Ga ago. Geochemical modeling of mantle melting systematics and trace element partitioning suggests that these observations can be explained by discontinuous changes in the mineralogy of mantle partial melting driven by a gradual decrease in mantle potential temperature, without appealing to any change in tectonic process. This interpretation is supported by the geochemical record of slab fluid input to continental basalts, which indicates no long-term change in the global proportion of arc versus non-arc basaltic magmatism at any time in the preserved rock record. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110167
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: Berkeley Geochronology Center, Berkeley, CA 94709, United States; Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States; Department of Geosciences, Guyot Hall, Princeton University, Princeton, NJ 08544, United States
Recommended Citation:
Keller B.,Schoene B.. Plate tectonics and continental basaltic geochemistry throughout Earth history[J]. Earth and Planetary Science Letters,2018-01-01,481