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Dravite-bearing rocks from Dinas Head, Cornwall

Published online by Cambridge University Press:  14 March 2018

S. O. Agrell*
Affiliation:
Department of Geology, Victoria University of Manchester

Extract

In a previous paper describing the geological and petrographical details of the adinoles of Dinas Head, short references were made to the common occurrence among the adinoles and associated rock-types of the magnesia-rich tourmaline, dravite. It is proposed now to describe these tourmaline-rich rocks in more detail and to discuss the question of their origin.

Adinoles with accessory tourmaline occur wherever true adinoles are developed at Dinas Head, although tourmaline is characteristically absent from types 2 a, b, c, and 3 [1, pp. 318–323]. Bands with up to 30 % tourmaline occur interbanded with normal adinoles of type 1 and with certain spilosites.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1941

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References

1. Agrell, (S. O.). The adinoles of Dinas Head, Cornwall. Min. Mag., 1939, vol. 25, pp. 305337.Google Scholar
2. Andreae, (A.) and Osann, (A.). Tiefencontacte an den intrusiven Diabasen von New-Jersey. Verh. Naturhist.-med. Vet. Heidelberg, 1897, vol. 5, pp. 1627.Google Scholar
3. Bertrand, (L.). Contribution à l'histoire stratigraphique et tectonique des Pyrénés orientales et centrales. Bull. Serv. Carte Géol. France, 1908, vol. 17 (for 1906–7), no. 118.Google Scholar
4. Bruce, (E. L.). Magnesian tourmaline from Renfrew, Ontario. Min. Mag., 1917, vol. 18, pp. 133135.Google Scholar
5. Cook, (C. W.) and Kraus, (E. H.). Datolite from Great Notch, New Jersey. Amer. Journ. Sci., 1915, ser. 4, vol. 39, pp. 642645. [Min. Abstr. 1–29.]Google Scholar
6. Duparc, (L.) and Sigg, (H.). Sur un gisement de tourmaline dans une serpentine de l'Oural. Bull. Soc. Franç. Min., 1914, vol. 37, pp. 1419.Google Scholar
7. Ferrari, (M.). Sulla datolite del Monte Campotréra (Reggio Emilia). Atti (Rend.) Accad. Lincei, Roma, Cl. Sci. fis. mat. nat., 1924, ser. 5, vol. 33, sem. 1, pp. 439444. [M.A. 2–529.]Google Scholar
8. Hawkins, (A. C.). Datolite from North Plainfield, Somerset County, New Jersey. Amer. Journ. Sci., 1915, ser. 4, vol. 39, pp. 473474. [M.A. 1–29.]Google Scholar
9. Kayser, (E.). Ueber die Contactmetamorphose der körnigen Diabase im Harz. Zeits. Deutsch. Geol. Gesell., 1870, vol. 22, pp. 103180.Google Scholar
10. Kunitz, (W.). Die Mischungsreihen in der Turmalingruppe und die genetischen Beziehungen zwischen Turmalinen und Glimmern. Chemie der Erde, 1929, vol. 4, pp. 208251. [M,A. 4–203.]Google Scholar
11. Lacroix, (A.). Les phénoménes de contact de la lherzolite et de quelques ophites des Pyrénèes. Bull. Serv. Carte Géol. France, 1895, vol. 6, no. 42.Google Scholar
12. Lacroix, (A.). Minéralogie de Madagascar. Paris, 1922, vol. 1, especially pp. 437442. [M.A. 1–326.]Google Scholar
13. Longchambon, (M.). Contribution à l'étude du métamorphisme des terrains secondaires dans les Pyrénées orientales et Ariégeoises. Bull. Serv. Carte Géol. France, 1912, vol. 21 (for 1910–11), no. 131.Google Scholar
14. Manchester, (J. G.). The minerals of the Bergen Archways. Amer. Min., 1919, vol. 4, pp. 107116. [M.A. 1–28.]Google Scholar
15. Ransome, (F. L.). Geology and ore-deposits of the Breckenridge district, Colorado. Prof. Paper U.S. Geol. Surv., 1911, no. 75, pp. 9699.Google Scholar
16. Du Rietz, (T.). Peridotites, serpentines, and soapstones of northern Sweden.… Geol. För. Förh. Stockholm, 1935, vo1 57, pp. 133260.Google Scholar
17. Du Rietz, (T.). The injection metamorphism of the Muruhatten region … Årsbok Sveriges Geol. Undersök., 1938, vol. 32, no. 6, pp. 186.Google Scholar
18. Riggs, (R. B.). The analysis and composition of tourmaline. Amer. Journ. Sci., 1888, ser. 3, vol. 35, pp. 3551.Google Scholar
19. Shannon, (E. V.). Famous mineral localities: the datolite locality near Westfield, Massachusetts. Amer. Min., 1919, vol. 4, pp. 56. [M,A. 1–30.]Google Scholar
20. Shannon, (E. V.) Notes on anglesite … calcite, datolite. … Proc. U.S. Nat. Museum, 1920, vol. 58, pp. 437453. [M.A. 1–213.]Google Scholar
21. Shannon, (E. V.) The mineralogy and petrology of the intrusive Triassic diabase at Goose Creek, Loudoun County, Virginia. Proc. U.S. Nat. Museum, 1924, vol. 66, art, 2. [M.A. 3–204.]Google Scholar
22. Shannon, (E. V.) Mineralogy and petrography of Triassic limestone and conglomerate metamorphosed by intrusive diabase at Leesburg, Virginia. Proc. U.S. Nat. Museum, 1925, vol. 66, art. 28. [M.A. 3–204.]Google Scholar
23. Simpson, (E. S.). Contributions to the mineralogy of Western Australia— Series VI. Journ. Roy. Soc. W. Australia, 1931, vol. 17, pp. 137148. [M.A. 5–92.]Google Scholar
24. Slavík, (F.). and Fišer, (J.). Datolith unterhalb. Listic bei Beroun. Centralbl. Min., 1903, pp. 229235.Google Scholar
25. Walker, (F.). A tholeiitic phase of the quartz-dolerite magma of central Scotland. Min. Mag., 1930, vol. 22, pp. 368376.Google Scholar