Arthur Holmes

For other people named Arthur Holmes, see Arthur Holmes (disambiguation).
Arthur Holmes

Arthur Holmes around age 22
Born (1890-01-14)14 January 1890
Gateshead, United Kingdom of Great Britain and Ireland
Died 20 September 1965(1965-09-20) (aged 75)
London, United Kingdom
Nationality British
Institutions Durham University (1924–1942),
University of Edinburgh (1943–1956)
Alma mater Imperial College London
Influences Robert Strutt
Notable awards Murchison Medal (1940)
FRS (1942)[1]
Wollaston Medal (1956)
Penrose Medal (1956)
Vetlesen Prize (1964)

Arthur Holmes FRS[1] (14 January 1890 – 20 September 1965) was a British geologist who made two major contributions to the understanding of geology. He pioneered the use of radiometric dating of minerals and was the first earth scientist to grasp the mechanical and thermal implications of mantle convection, which led eventually to the acceptance of plate tectonics.[2][3]

Education and early life

As a child he lived in Low Fell, Gateshead and attended the Gateshead Higher Grade School (later Gateshead Grammar School).[4] At 17, he enrolled to study physics at the Royal College of Science (now Imperial College London), but took a course in geology in his second year which settled his future, against the advice of his tutors. Surviving on a scholarship of £60/year was difficult and on graduating he took a job prospecting for minerals in Mozambique. After six months, with no discoveries, he became so ill with malaria that a notice of his death was posted home. However he recovered enough to catch the boat home and became a demonstrator at Imperial College.[5]

He obtained his doctorate (of Science) in 1917 and in 1920 joined an oil company in Burma as chief geologist. The company failed, and he returned to England penniless in 1924. He had been accompanied in Burma by his three-year-old son, who contracted dysentery and died shortly before Holmes's departure.

After his wife died in 1938, Holmes married Doris Reynolds, a geologist who had joined the teaching staff at Durham. After his death she edited the third edition of the Principles.[6]

Age of the earth

Holmes was a pioneer of geochronology, and performed the first accurate uranium-lead radiometric dating (specifically designed to measure the age of a rock) while an undergraduate in London, assigning an age of 370 Ma to a Devonian rock from Norway, improving on the work of Boltwood who published nothing more on the subject. This result was published in 1911,[7] after his graduation in 1910.

1912 saw Holmes on the staff of Imperial College, publishing his famous book The Age of the Earth in 1913 in which he argued strongly for radioactive methods compared with methods based on geological sedimentation or cooling of the earth (many people still clung to Lord Kelvin's calculations of less than 100 Ma). He estimated the oldest Archean rocks to be 1,600 Ma, but did not speculate about the Earth's age.[8] By this time the discovery of isotopes had complicated the calculations and he spent the next years grappling with these. His promotion of the theory over the next decades he earned the nickname of Father of modern geochronology.[9] By 1927 he had revised this figure to 3,000 Ma[10] and in the 1940s to 4,500±100 Ma, based on measurements of the relative abundance of uranium isotopes by Alfred O. C. Nier.[11] The general method is now known as the Holmes-Houterman model after Fritz Houtermans who published in the same year, 1946.[12]

In 1924 he was appointed to the newly created post of reader in geology at Durham University. Eighteen years later his achievements were recognised, when he became a Fellow of the Royal Society in 1942.[1] In the following year he was appointed to the chair of geology at the University of Edinburgh, which he held until retirement in 1956. In 1944 he published the first edition of his Principles of Physical Geology which became a standard text-book in the UK and elsewhere.[13]

Continental drift

Spreading at a mid-ocean ridge

Holmes championed the theory of continental drift promoted by Alfred Wegener at a time when it was deeply unfashionable with his more conservative peers. One problem with the theory lay in the mechanism of movement, and Holmes proposed that Earth's mantle contained convection cells that dissipated radioactive heat and moved the crust at the surface. His Principles of Physical Geology ended with a chapter on continental drift. Part of the model was the origin of the seafloor spreading concept.[14][15]

Honours and awards

He was awarded both the Wollaston Medal and the Penrose Medal in 1956. The Arthur Holmes Medal of the European Geosciences Union is named after him.

A crater on Mars has been named in his honour.

The Durham University Department of Earth Sciences' Arthur Holmes Isotope Geology Laboratory Check |url= value (help)  is named after him, as is the students' Geology Society.

Major works

References

  1. 1 2 3 Dunham, K. C. (1966). "Arthur Holmes 1890-1965". Biographical Memoirs of Fellows of the Royal Society 12: 290–226. doi:10.1098/rsbm.1966.0013.
  2. ↑ Edmond A. Mathez, ed. (2000), EARTH: INSIDE AND OUT, New Press, retrieved 5 February 2013
  3. ↑ "Holmes, Arthur". The Oxford Dictionary of National Biography. 2004. doi:10.1093/ref:odnb/33951.
  4. ↑ Commemorative Plaques in Gateshead Borough
  5. ↑ Lewis, Cherry L. E., Arthur Holmes: An Ingenious Geoscientist (PDF), retrieved 5 February 2013
  6. ↑ Doris Reynolds, retrieved 5 February 2013
  7. ↑ Holmes, A. (1911). "The Association of Lead with Uranium in Rock-Minerals, and Its Application to the Measurement of Geological Time". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 85 (578): 248. Bibcode:1911RSPSA..85..248H. doi:10.1098/rspa.1911.0036.
  8. ↑ Holmes, Arthur (1913), The Age of the Earth, London: Harper, p. 18
  9. ↑ The Arthur Holmes Geological Society, University of Durham, retrieved 3 February 2013
  10. ↑ Dalrymple, G. Brent (2004), Ancient Earth, Ancient Skies: The Age of Earth and Its Cosmic Surroundings, Stanford University Press, p. 52 Oddly Dalrymple doesn't seem to have read Holmes's 1913 edition.
  11. ↑ Reynolds, John H., Alfred Otto Carl Nier
  12. ↑ Dalrymple 2004, p. 156
  13. ↑ Holmes, Arthur (1944), Principles of Physical Geology (1 ed.), Edinburgh: Thomas Nelson & Sons, ISBN 0-17-448020-2
  14. ↑ Wessel, P.; Müller, R. D. (2007), "Plate Tectonics", Treatise on Geophysics 6, Elsevier, pp. 49–98
  15. ↑ Vine, F. J. (1966). "Spreading of the Ocean Floor: New Evidence". Science 154 (3755): 1405–1415. Bibcode:1966Sci...154.1405V. doi:10.1126/science.154.3755.1405. PMID 17821553.

External links

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