Trace element modelling

Pearce JA, Parkinson IJ (1993) Trace element models for mantle melting application to volcanic arc petrogenesis. J Geol Soc Lond 76 373-403... 

U-Series modeling versus trace element modeling... 

There is fundamental difference between trace element modeling and U-series modeling of the extracted melt. Melting rate affects U-series systematics but not stable element concentrations. Here we will explore this subject quantitatively. According to Eq. (5.50), trace element concentration in the extracted melt is a function of and X (or (p and /)... 

Pearce JA, Parkinson IJ (1993) Trace element models for mantle melting application to volcanic arc petrogenesis. Geol Soc London Spec Publ 76 373-403 Pearce JA, Peate DW (1995) Tectonic implications of the composition of volcanic arc magmas. Ann Rev Earth Planet Sci 23 251-285... 

Harris N. B. W. and Inger S. (1992) Trace element modelling of pelite-derived granites. Contrib. Mineral. Petrol. 110,... 

A common application of this equation to trace element modeling is to examine the variations in trace element abundances and ratios for elements with different bulk distribution coefficients (Figure 7). In this plot, F is the fraction of melt for equilibrium crystallization, F proceeds from... 

Figure 8 Distribution of Be, B, Rb, Sr, Y, Ce, and Ba between minerals of average MORB and peUte in blueschist and eclogite facies (employing representative mineral modes for natural bluescbists and experimental epidote-eclogite, and trace element concentration data mostly from Domanik et al, 1993). At subsoUdus temperatures, diffusive equilibration is ineffective (except for micas) and tbe equiUbrating volume that needs to be taken into account for trace-element modeling is defined by tbe reacting minerals. Thus, a given trace element equilibrates with tbe fluid only when its host phase(s) break(s) down.

Ayers J. (1998) Trace element modeling of aqueous fluid peridotite interaction in the mantle wedge of subduction zones. Contrib. Min. Petrol. 132, 390—404. 

The development of trace element modelling in petrology represents a major advance in geochemistry. However, this approach must be used with some caution for two reasons. 

For this reason, trace element modelling must be regarded as a means of hypothesis testing and should be used to verify an already constrained model. Wherever possible, trace element studies should be part of a broader approach to a geochemical problem which includes the constraints of the major element and isotopic chemistry. 

In this chapter we first develop some of the theory behind the distribution of trace elements and explain the physical laws used in trace element modelling. Then various methods of displaying trace element data are examined as a prelude to showing how trace elements might be used in identifying geological processes and in testing hypotheses. 

In this section we illustrate the way in which trace element modelling has been used to idendfy differing petrogenetic processes in igneous rocks. 

Figure 7, Whole-lake trace element model.

Hergt et al. (1989) used trace-element modeling to show that the chemical and isotopic compositions of the... 

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