The use of ``immobile'' trace elements to distinguish the palaeotectonic affinities of metabasalts: Applications to the Paleocene basalts of Mull and Skye, Northwest Scotland

Details The use of ``immobile'' trace elements to distinguish the palaeotectonic affinities of metabasalts: Applications to the Paleocene basalts of Mull and Skye, Northwest Scotland The use of ``immobile'' trace elements to distinguish the palaeotectonic affinities of metabasalts: Applications to the Paleocene basalts of Mull and Skye, Northwest Scotland

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..39..407a&link_type=abstract

Earth and Planetary Science Letters, Volume 39, Issue 3, p. 407-416.

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Scientific paper

The regional zeolitisation in the British Tertiary Volcanic Province causes little change in K and Sr in transitional basalts but mobilises these elements in the tholeiites. In contrast, local greenschist-facies hydrothermal alteration affects K and Sr in both basalt types and also P in tholeiites. Titanium, Nb, Zr and Y appear to be unaffected by low-grade metamorphism in all the basalts. Plots involving these elements cannot distinguish between Hebridean tholeiitic and alkalic basalts but demonstrate the occurrence of several distinct basaltic magma types on a regional scale within the Tertiary Province. Such magma types are not merely a feature of individual centres. Similar spatial chemical variation appears to occur within other extensional igneous provinces. Attempts to deduce the palaeotectonic regime of the British Tertiary Volcanic Province from published ``diagnostic'' diagrams produce conflicting results, even for the same magma type. The range of settings derived for the area as a whole is clearly at variance with its known relation to the opening of the North Atlantic. The results suggest that the use of trace elements alone to diagnose the tectonic setting of ancient metabasic sequences could lead to erroneous results.

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