The Elements of economic geology

Bibliographic data

Monograph

Identifikator:: 1773832379

URN:: urn:nbn:de:zbw-retromon-172798

Document type:: Monograph

Author:: Gregory, John W. http://d-nb.info/gnd/11683014X

Title:: The Elements of economic geology

Place of publication:: London

Publisher:: Methuen

Year of publication:: 1928

Scope:: XIV, 312 S.; graph. Darst.

Digitisation:: 2021

Collection:: Economics Books

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Chapter

Document type:: Monograph

Structure type:: Chapter

Title:: Part III. Earthy minerals

Collection:: Economics Books

THE SALT DEPOSITS 213 salt sometimes pass from the dome into the adjacent beds. More than sixty of these salt domes have been found during the development of the Louisiana oilfield, some by the use of the torsion balance and the earthwaves due to explosions. The salt dome at Spindletop gave the clue to the oilfields of Mexico. Salt domes have been explained by igneous action; but they are secondary formations due to ascending water. The salt dome area is underlain by Kainozoic and Cretaceous rocks, and doubtless by salt-bearing beds belonging to the Trias or Permian. Most of the Louisiana salt domes are regularly arranged, as at the angles of a network; they probably occur where intersecting faults afforded a channel up which water charged with salt escaped from the under- Fic. 55.—SaLT DOME AT THE Baicor OILFIELD, RuMANIA. sands and gravels with land and fresh-water shells; D, Dacic—oil beds with lignite, P, Pontic—marine marls; M, Meotic — Pliocene fresh-water sands. S, salt intrusion. (After Slomnicki and Meyer, 1925.) 0 lying red sandstones. As the water approached the surface it was cooled and deposited its salt in the channel. Further salt was added to the base of the block and the crystalli- zation of this salt pushed the mass like a spear-head through the soft wet clays (cf. Fig. 637). The Egeln dome in Germany (Fig. 56) contains a vertical thickness of 4000 feet of continuous salt. This thickness is due in part to the salt being uptilted and repeated by over- thrust faults ; but the salt has been partly squeezed into this pillar and enlarged by solution and redeposition during the faulting. The faults are of Kainozoic age and were due to disturbances connected with the uplifting of the Alps, A salt dome at Aschersleben occurs beside the great faults along the compressed fold of the northern Harz Mountains. A similar salt intrusion occurs at Baicoi in the Rumanian silfields (Fig. 55).

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