Hostname: page-component-78c5997874-ndw9j Total loading time: 0 Render date: 2024-11-13T00:59:35.370Z Has data issue: false hasContentIssue false
  • English
  • Français

Metamorphosed Lamprophyres and the Late Thermal History of the Moines

Published online by Cambridge University Press:  01 May 2009

M. R. W. Johnson  and
I. W. D. Dalziel
M. R. W. Johnson
Affiliation:
Grant Institute of Geology, University of Edinburgh.
I. W. D. Dalziel
Affiliation:
Grant Institute of Geology, University of Edinburgh.
Get access Rights & Permissions [Opens in a new window]

Abstract

Certain lamprophyres in Moidart exhibit at least three sets of minor structures (cleavages, lineations and small-scale folds). During the formation of the first set the lamprophyres acquired a schistose fabric: hornblende and biotite laths crystallized along the axial surfaces of tightly compressed folds. The deformation episodes recognized in the lamprophyre sheets post-date the main episodes of major and minor folding (F1-F3) that affected the surrounding Moine gneisses. The existence of a metamorphic fabric in these lamprophyres raises interesting problems—was the thermal energy required to “metamorphose” the lamprophyres derived from deformational heat, or by a heat flow from the Moine country rocks, or were the lamprophyres deformed during cooling and consolidation from the magmatic state (autothermal metamorphism) ?

Type
Articles
Information
Geological Magazine , Volume 103 , Issue 3 , June 1966 , pp. 240 - 249
Copyright
Copyright © Cambridge University Press 1966

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Barber, A. J., 1965. The History of the Moine Thrust Zone, Lochcarron and Lochalsh, Scotland. Proc. Geol. Assoc. Lond., 76, 215–234.CrossRefGoogle Scholar
Christie, J. M., 1960. Mylonitic Rocks of the Moine Thrust Zone in the Assynt Region, North-west Scotland. Trans. geol. Soc. Edinb., 18, 79–93.CrossRefGoogle Scholar
Cunningham, Craig E. M. et al. , 1911. Geology of Colonsay and Oronsay. Mem. geol. Surv. Gt. Britain.Google Scholar
Dalziel, I. W. D. and Johnson, M. R. W., 1963. Evidence for the Geological Dating of the Granitic Gneiss of Western Ardgour. Geol. Mag., 100, 244–254.CrossRefGoogle Scholar
Gallacher, M. J. 1963. Lamprophyre dykes from Argyll. Miner. Mag., 33, 415–430.Google Scholar
Harker, A., 1950. Metamorphism. London.Google Scholar
Lawrie, T. R. M. et al. , 1961. Scottish Highlands and Islands. Summ. Progr. geol. Surv. London for 1960.Google Scholar
MacGregor, A. G. and Kennedy, W. Q., 1932. The Morven-Strontian Granite. Summ. Progr. geol. Surv. London for 1931. Part II, 105–119.Google Scholar
Nelson, B. W. and R., Rov, 1958. Synthesis of the Chlorites and their Structural and Chemical Constitution. Amer. Min., 43, 707–725.Google Scholar
O'Hara, M. J., 1961. Petrology of the Scourie Dyke, Sutherland. Miner. Mag., 32, 848–865.Google Scholar
Peach, B. M. et al. , 1912. Geology of Ben Wyvis. Mem. geol. Surv. Gt. Britain.Google Scholar
Phemister, J., 1960. British Regional Geology: The Northern Highlands. 3rd Edition, H.M.S.O., Edinburgh.Google Scholar
Richey, J. E. et al. , 1932 and 1934–1936. Scotland, West Highland District. Summ. Progr. geol. Surv. London for 1931 and 1933-1935.Google Scholar
Soper, N. J., 1964. Conditions in the Metamorphic Caledonides during the Period of Late Orogenic cooling. Geol. Mag., 101, 567–8.CrossRefGoogle Scholar
Sutton, J. and Watson, J. V., 1959. Metamorphism in Deep-Seated Zones of Transcurrent Movement at Kungwe Bay, Tanganyika Territory. J. Geol., 67, 1–13.CrossRefGoogle Scholar
Turnock, A. C., 1960. The Stability of Iron Chlorites. Carn. Inst. Wash. Ann. Rep. Dir. Geophys. Lab., 59, 98–103.Google Scholar
Watson, J. V., 1964. Conditions in the Metamorphic Caledonides during the period of late-orogenic cooling. Geol. Mag., 101, 457–465.Google Scholar