Hostname: page-component-586b7cd67f-t8hqh Total loading time: 0 Render date: 2024-11-26T11:42:03.522Z Has data issue: false hasContentIssue false
  • English
  • Français

Sedimentary inclusions in the hypersthene-gabbro, Ardnamurchan, Argyllshire

Published online by Cambridge University Press:  14 March 2018

M. K. Wells
M. K. Wells*
Affiliation:
University College, University of London
Get access Rights & Permissions [Opens in a new window]

Extract

The hypersthene-gabbro of Ardnamurchan Point is the earliest of the intrusions of Centre 2 of the Ardnamurchan complex as shown by 5. E. Richey (11, p. 208).I The mass is intruded into domed Jurassic sediments and Tertiary basalt flows (fig. 1). The main part of the intrusion is composed of rather fine-grained gabbro, containing 2-3 % of hypersthene which typically surrounds crystals of olivine. Marginally, however, the gabbro is a quartz-bearing variety, with a micrographic mesostasis. The outer contact is somewhat sinuous due to the fact that the intrusion has only been exposed to a comparatively small depth below its original roof. This same geological accident may account in part for the number of fine-grained, basic, granular masses that are locally abundant within the gabbro.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 29 , Issue 214 , September 1951 , pp. 715 - 736
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1951

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

1. Chelius, (C.). Das Granitmassif des Melibocus und seine Ganggcsteine. Notizblatt des Vereins für Erdkunde zu Darmstadt, 1892. iv. Folge, 13. Heft, pp. 1–13.Google Scholar
2. Grotit, (F.F.). Probable extent of abyssal assimilation. Bull. Geol. Soc. Amcr., 1930. vol. 41, pp. 675–694.Google Scholar
3. Harker, (A.). The Tertiary igneous rocks of Skye. Mem. Geol. Surv. Scotland, 1904.Google Scholar
4. Harker, (A.). Metamorphism. London, 1939. pp. 68–69. [M.A. 5–194.]Google Scholar
5. Klemm, (G.). Petrographische Mitteilungen aus dem Odenwalde. Notizblatt des Vereins für Erdkunde und der Hessischen Geol. Landessanst. zu Darmstadt, 1926. v. Folge, 9. Heft, pp. 104–117.Google Scholar
6. Macgregor, (A. G.). Scottish granulite hornfelscs and Odenwald beerbachites. Geol. Mug., 1931. vol. 68, pp. 500–521.Google Scholar
7. Read, (H.H.). On corundum–spinel xenoliths in the gabbro of Haddo House, Abcrdeenshire. Geol. Mag., 1931. vol. 68, pp. 446–453. [M.A. 5–74.]Google Scholar
8. Read, (H.H.). The gabbros and associated xcnolithic complex of the Haddo House district, Aberdccnshirc. Quart. Journ. Geol. Soc. London, 1935. vol. 91, pp. 591–635.Google Scholar
9. Reynolds, (D.L.). Demonstrations in petrogenesis from Kfloran Bay, Colonsay. 1. The transfusion of quartzite. Min. Mag., 1936. vol. 24, pp. 367407.Google Scholar
10. Reynolds, (D.L.). Transfusion phenomena in lamprophyre dykes and their bearing on petrogenesis. Geol. Mag., 1938. vol. 75, pp. 51–76.Google Scholar
11. Richey, (J.E.) and Thomas, (H.H.). Geology of Ardnamurehan, &c. Mem. Geol. Survey, Scotland, 1930.Google Scholar
12. Sadashivaiah, (M.S.). Olivine–bearing and other basic hornfelses around the Insch igneous mass, Aberdeenshire. Geol. Mag., 1950. vol. 87, p. 121.Google Scholar
13. Schwartz, (G.M.). The contrast in the effect of granite and gabbro intrusions on the Ely greenstone. Journ. Geol. Chicago, 1924. vol. 37, pp. 89–138.Google Scholar
14. Walker, (F.) and Poldervaart, (A.). Karroo dolerites of the Union of South Africa. Bull. Geol. Soc. Amer., 1949. vol. 60, pp. 591–705. [M.A. 11–32.]Google Scholar
15. Winchell, (A.N.). Elements of optical mineralogy, New York, 1933. Part II, p. 233. [M.A. 5–337.]Google Scholar