Skip to Main Content
Book Chapter

Petrography of Salt Dome Cap Rock

By
Marcus I. Goldman
Marcus I. Goldman
U.S. Geological Survey, Washington, D.C.
Search for other works by this author on:
Published:
January 01, 1926

Abstract

Two kinds of cap rock are differentiated: the gypsum anhydrite-cap and the calcite cap. The gypsum is derived from the anhydrite by hydration and is characteristic of the upper part of the cap, where it contains much calcite and sulphur. The deeper, less altered part of the anhydrite cap shows parallel banding, which may be the result of diffusion, and breccia fragments of a parallel-banded, finer-grained anhydrite, which give evidence of sedimentary origin. Therefore, although no detrital minerals have been found in specimens of anhydrite cap, this cap is believed to be of sedimentary origin, brought up by an intrusive salt plug from depth. Possible explanations of the presence or absence of anhydrite caps on salt domes are offered. The calcite cap is the product of replacement and penetration by calcite of the sedimentary beds adjacent to the gypsum-anhydrite cap and probably of the upper part of the gypsum-anhydrite cap itself. The sulphur in cap rock is characteristically associated with this calcite. The calcite and sulphur are probably the result of reduction of the outer parts of the anhydrite cap by hydrocarbons from adjacent beds. Constituents of minor importance are sulphides, carbonates of an early generation, barite, celestite, bipyramidal quartz crystals, and inclusions of sandstone in anhydrite.

You do not currently have access to this article.

Figures & Tables

Contents

AAPG Special Publication

Geology of Salt Dome Oil Fields

E. DeGolyer
E. DeGolyer
Search for other works by this author on:
W. A. J. M. Van Waterschoot Van Der Gracht
W. A. J. M. Van Waterschoot Van Der Gracht
Search for other works by this author on:
Marcus I. Goldman
Marcus I. Goldman
Search for other works by this author on:
I. P. Voiteşti
I. P. Voiteşti
Search for other works by this author on:
S. L. Mason
S. L. Mason
Search for other works by this author on:
Hans Stille
Hans Stille
Search for other works by this author on:
Donald C. Barton
Donald C. Barton
Search for other works by this author on:
Sidney Powers
Sidney Powers
Search for other works by this author on:
W. C. Spooner
W. C. Spooner
Search for other works by this author on:
David Donoghue
David Donoghue
Search for other works by this author on:
Francis Edward Vaughan
Francis Edward Vaughan
Search for other works by this author on:
R. H. Goodrich
R. H. Goodrich
Search for other works by this author on:
Lyman C. Reed
Lyman C. Reed
Search for other works by this author on:
P. K. Kelley
P. K. Kelley
Search for other works by this author on:
H. E. Minor
H. E. Minor
Search for other works by this author on:
Roland B. Paxton
Roland B. Paxton
Search for other works by this author on:
A. S. Henley
A. S. Henley
Search for other works by this author on:
John R. Suman
John R. Suman
Search for other works by this author on:
George Sawtelle
George Sawtelle
Search for other works by this author on:
George M. Bevier
George M. Bevier
Search for other works by this author on:
W. F. Bowman
W. F. Bowman
Search for other works by this author on:
Alexander Deussen
Alexander Deussen
Search for other works by this author on:
Laura Lee Lane
Laura Lee Lane
Search for other works by this author on:
D. S. Hager
D. S. Hager
Search for other works by this author on:
E. Stiles
E. Stiles
Search for other works by this author on:
Paul L. Applin
Paul L. Applin
Search for other works by this author on:
William Kennedy
William Kennedy
Search for other works by this author on:
Albert G. Wolf
Albert G. Wolf
Search for other works by this author on:
Ben C. Belt
Ben C. Belt
Search for other works by this author on:
W. F. Henniger
W. F. Henniger
Search for other works by this author on:
Raymond C. Moore
Raymond C. Moore
Search for other works by this author on:
Wallace E. Pratt
Wallace E. Pratt
Search for other works by this author on:
Donald C. Barton
Donald C. Barton
Search for other works by this author on:
Alexander Deussen
Alexander Deussen
Search for other works by this author on:
J. P. D. Hull
J. P. D. Hull
Search for other works by this author on:
American Association of Petroleum Geologists
ISBN electronic:
9781629812601
Publication date:
January 01, 1926

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal