Lead isotope evidence for the nature of the mantle beneath Caledonian Scotland

Details Lead isotope evidence for the nature of the mantle beneath Caledonian Scotland Lead isotope evidence for the nature of the mantle beneath Caledonian Scotland

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986e%26psl..80...55t&link_type=abstract

Earth and Planetary Science Letters, Volume 80, Issue 1-2, p. 55-70.

Computer Science

1

Scientific paper

Recent Nd-Sr-Pb isotope studies of Caledonian granitoids [1-4] have reopened the question of the existence of an unusual or enriched mantle source beneath Caledonian Scotland. This was postulated [5] following a Nd-Sr isotope geochemical study of lavas associated with the Scottish Old Red Sandstone. Pb isotope data for the same lavas reported here restrict any major crustal involvement in southwest Highland primitive lavas to ca. 1750 Ma old Rb-depleted granulites. The lack of such crustal material within Scotland together with Pb-Sr isotopic relationships strongly suggests that a large volume mantle source with low μ, Rb/Sr and Sm/Nd has been present at depth under western Scotland since the early Proterozoic. It is unlikely that this is the same enriched mantle source observed from xenoliths in younger magmas [25], and is probably located deep in the lithosphere or within the asthenosphere. This source has contributed extensively to the incompatible element budget of Caledonian granitoids implying that the Caledonian orogeny did result in significant growth of the British crust.
Present address: Department of Geology, RHB New College, Egham Hill, Egham, Surrey, U.K.

Affiliated with

Also associated with

No associations

Rating

Lead isotope evidence for the nature of the mantle beneath Caledonian Scotland does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Lead isotope evidence for the nature of the mantle beneath Caledonian Scotland, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lead isotope evidence for the nature of the mantle beneath Caledonian Scotland will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1736758