F. H. Stewart

University of Edinburgh

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

L. R. Wager

Natural History Museum

M. J. O’Hara

Chiba University

J. E. Richey

University of Washington

M. R. W. Johnson

Rutherford Appleton Laboratory

J. T. Greensmith

University College London

W. J. Wadsworth

University of Manchester

C. A. Beevers

University of Edinburgh

A. T. V. Rothstein

Portsmouth College

Cooperative Institutions

University of Edinburgh

University of Manchester

Natural History Museum

Czech Academy of Sciences, Institute of Geology

University College London

Universidad de Londres

University of London

Queen Mary University of London

Mile End Hospital

Manchester University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

THE PERMIAN LOWER EVAPORITES OF FORDON IN YORKSHIRE

Proceedings of the Yorkshire Geological Society (1963)

F. H. Stewart

Summary In the Fordon No. 1 borehole, sunk by the D’Arcy Exploration Company to a depth of 7559 feet near Scarborough, the Permian succession contains 1387 feet of evaporites. This paper describes and discusses the Lower Evaporites in detail. These are 1069 feet in thickness, and the petrography of each of the main ten subzones they contain is described. The major constituents are dolomite, anhydrite, polyhalite, kieserite and halite. Minor constituents include magnesite, glauberite, celestine, aphthitalite, pyrite, sulphoborite, sulphur and talc. Glauberite and sulphoborite are new to Britain. The origin of the rocks is discussed in relation to experimental work on salt systems. The ten subzones can be placed in three cycles of sedimentation, each ended by a relatively sudden increase in rate of subsidence, the middle cycle consisting of two sub-cycles. The upper and lower cycles are relatively simple, consisting mainly of halite and anhydrite, but the middle cycle is more complex, and contains rocks unlike any so far recorded from this country. On textural evidence it is concluded that, whereas gypsum was a primary mineral of the upper and lower cycles, the calcium sulphate of the middle cycle was deposited as anhydrite. The latter has been replaced by polyhalite on a large scale, and it is believed that this change was penecontemporaneous, and released enough calcium for the formation of a large amount of primary polyhalite. The later succession has therefore been considerably modified, and some of the polyhalite and kieserite-bearing subzones may represent the potash-free magnesium sulphate and kainite zones of the experimental succession. There is evidence of a considerable number of replacements. Most of the major ones are probably penecontemporaneous. Others are post-consolidation effects, probably due to rise of temperature and pressure during burial. Some, like those involving glauberite, have probably been effected by solutions rising from a lower cycle; others have been effected by downward or sideways moving solutions from the same or a higher cycle. Some replacements are later than movement and recrystallization of halite under pressure. A count of rhythmic layers in the middle cycle gives information on rates of deposition and suggests that this cycle may have been deposited in about 25000 years. The Fordon Lower Evaporite succession is compared with that in other parts of Yorkshire. The Fordon evidence favours Lotze’s correlation of the Lower Evaporites of Yorkshire with the Middle Zechstein of Germany.

10.1144/pygs.34.1.1

Cite

Citations (17)

Age Relations of certain Granites in Skye

Geological Magazine (1947)

J. E. Richey F. H. Stewart L. R. Wager

An abstract is not available for this content so a preview has been provided. As you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Content (measure theory)

10.1017/s0016756800082467

Cite

Citations (4)

Acceptance of the mineralogical society of America award

American Mineralogist (1953)

F. H. Stewart

Source

Cite

Citations (0)

Olivine–Liquid Reaction and the Depth of Crystallization of the East Aberdeenshire Gabbros

Nature (1966)

M. J. O’Hara F. H. Stewart

Consolidation

Magma chamber

10.1038/210830a0

Cite

Citations (5)

On Dalradian structures in north-east Scotland

Transactions of the Edinburgh Geological Society (1960)

M. R. W. Johnson F. H. Stewart

Sutton and Watson (1956) established the presence of a major fold—the Boyndie Syncline—in the Lower and Upper Dalradian rocks of N.E. Scodand. Examination of the coastal exposures between Portsoy and Macduff has added some new structural data to that collected by Sutton and Watson and it is suggested that the Boyndie syncline is a late structure that has been superimposed on a group of roughly east-west trending structures. The relation of the metamorphic events (“Barrovian” and “Buchan” types) to the fold history is briefly discussed and some comments are included on the status of the Banff Nappe proposed by H. H. Read.

Dalradian

Syncline

Watson

10.1144/transed.18.1.94

Cite

Citations (15)

Cryptic layering in the Belhelvie intrusion, Aberdeenshire

Scottish Journal of Geology (1966)

W. J. Wadsworth F. H. Stewart A. T. V. Rothstein

Synopsis A re-investigation of the northern part of the Belhelvie intrusion indicates that the layered sequence can be divided into three main units (A, B, and C), based on the successive cumulus mineral assemblages olivine, olivine-plagioclase, and olivine-plagioclase-2 pyroxenes. In this part of the intrusion the thickness of the layered series is at least 6000 ft, and cryptic variation is from Fo 86→80 , An 81→74 , En 85→78½ , and Ca 42 Mg 51 Fe 7 to Ca 41 Mg 48 Fe 11. Over much of the outcrop the rhythmic layering is nearly vertical, but in the eastern part there is evidence that the succession is almost horizontal. The Belhelvie intrusion is considered in its regional setting, and compared with the other ‘younger gabbros’ of north-east Scotland.

Layering

10.1144/sjg02010054

Cite

Citations (16)

The structural problem of the younger gabbros of north-east Scotland

Transactions of the Edinburgh Geological Society (1960)

F. H. Stewart M. R. W. Johnson

The evidence for and against deformation of the gabbroic masses is discussed. It is suggested that some of the so-called “older” igneous rocks, at Portsoy and along the western margin of the Huntly mass, are actually parts of the “younger” Huntly mass. The younger masses are later than the early fold structures of the Banffshire coast. Evidence from the primary structures of the igneous masses strongly favours deformation by the Boyndie-Buchan group of folds. Evidence against such folding, although suggestive, cannot be accepted without further work. It is likely that a solution will be found when the Insch and Huntly masses and the rocks of their thermal aureoles have been studied in detail.

10.1144/transed.18.1.104

Cite

Citations (25)

The place of geology in government scientific research

Journal of the Geological Society (1971)

F. H. Stewart

‘There is no science whose value can be adequately estimated by economists and utilitarians of the lower order’ H ugh M iller 1841 ‘It is most important that the opportunity afforded by the appointment of a new Director of the Museum of Practical Geology should not be lost for furthering the general scheme for bringing science and art to bear upon the productive industry of the Country. . . . . .as it so often happens that the person who through great difficulties, and by his own exertions has succeeded in realizing one idea, does not readily merge this in a larger one, so Mr H. De la Beche cannot be said to have extended the usefulness of his Department, but has rather counteracted the plans of the Commissioners by confining his attention to simple Geology. It becomes of the utmost importance that whoever is appointed now should be made thoroughly aware of the views of Government and accept the office with a clear understanding that he will be counted upon to work them out. He should further consider himself not in the light of a simple Geologist, but as the head of a Government educational establishment for the diffusion of Science generally as applied to productive industry.’ (‘Copy of a letter of Prince Albert to Lord Palmerston when my good friend the latter appointed me Director General of the Geological Survey May 1855. R. I. M urchison ’) P erhaps the range of attitudes has not changed all that much in the last hundred

10.1144/gsjgs.127.5.0437

Cite

Citations (0)

Replacements involving early carnallite in the potassium-bearing evaporites of Yorkshire

Mineralogical Magazine and Journal of the Mineralogical Society (1956)

F. H. Stewart

Summary Evidence from four recent boreholes in the Yorkshire potash field suggests that carnallitic was an important original constituent of the Middle Evaporite Bed, and that much of the sylvine of the potash zone is of secondary origin. The carnallitie rocks have been affected by complex replacements, an earlier series involving sylvine, halite, and anhydrite, and a later series involving rinneite, halite, sylvine, and carnallitic.

Potash

Halite

Anhydrite

10.1180/minmag.1956.031.233.02

Cite

Citations (18)

p-Veatchite from Yorkshire

Mineralogical Magazine and Journal of the Mineralogical Society (1960)

C. A. Beevers F. H. Stewart

An abstract is not available for this content so a preview has been provided. Please use the Get access link above for information on how to access this content.

Content (measure theory)

10.1180/minmag.1960.032.249.09

Cite

Citations (2)