Pearce Nb-Ti-Yb {GCDkit} | R Documentation |
Assigns data for a TiO2/Yb vs. Nb/Yb diagram
into Figaro template (list 'sheet
') and appropriate values
into 'x.data
' and 'y.data
'.
PearceNbTiYb(reservoirs=TRUE,xmin=0.1,xmax=100,ymin=0.1,ymax=10)
reservoirs |
logical, should be plotted average NMORB, EMORB and OIB? |
xmin,xmax |
numeric, limits for the x axis. |
ymin,ymax |
numeric, limits for the y axis. |
The diagram TiO2/Yb vs. Nb/Yb serves as 'melting depth proxy' and hence for indicating mantle temperature and thickness of the conductive lithosphere (Pearce 2008). It distinguishes basalts, which have originated by shallow melting, out of garnet stability field ('MORB array') from those spanning from deep melting with garnet in the residue ('OIB array'). Plotted for reference are average compositions of NMORB, EMORB and OIB taken from Sun and McDonough (1984).
sheet |
list with Figaro Style Sheet data |
x.data |
Nb/Yb |
y.data |
TiO2/Yb |
Vojtech Janousek, vojtech.janousek@geology.cz
Pearce JA (2008) Geochemical fingerprinting of oceanic basalts with applications to ophiolite classification and the search for Archean oceanic crust. Lithos 100: 14-48 doi:10.1016/j.lithos.2007.06.016
Sun SS, McDonough WF (1989) Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes. In: Saunders AD, Norry M (eds) Magmatism in Ocean Basins. Geological Society of London Special Publications 42, pp 313-345
figaro plotDiagram PearceNbThYb
#plot the diagram plotDiagram("PearceNbTiYb",FALSE,FALSE,reservoirs=TRUE) plotDiagram("PearceNbTiYb",FALSE,FALSE,reservoirs=FALSE)