Origin of the Anhydrite Cap Rock of American Salt Domes Page: Front Index
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CONTENTS
Abstract ------------------- ~- ---- ------ ---
Introduction_---------- -- --- --- --------
Terminology--------- -------------
Two hypotheses of origin_....-- --- --.- -.. --- --_
The process of origin of cap rock by residual accumula-
tion----------------- -- -------------- .-- .----
Considerations and evidence in support of the hypothesis
of origin by residual accumulation----------..-..
Evidence from the breccia fragments_----.----
Sedimentary origin of the breccia fragments - -_
Primary katatectic cap rock ..----.----- -
Three hypotheses of brecciation...----._...-..
An intraformational sedimentary breccia_ -
A brecciated overlying bed or a residual
breccia _ . . . ._ ..__. _____.__ .
The parallel bands (katatectic bands)- ..-_--__-.
Examples of katatectic banding----_-_ -
Hypotheses of origin of katatectic banding -. -Page
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89Considerations and evidence in support of the hypothesis
of origin by residual accumulation-Continued.
The parallel bands (katatectic bands)--Con.
Considerations and evidence in support of the
origin of katatectic banding and of the an-
hydrite cap rock in general by residual ac-
cum ulation ------~-_ -_ --_ --~~~~--~_ ~-~~
Probability of periodicity in residual ac-
cumulation... __ ____ ___
Differences from shear surfaces-----__---
The salt table___ _____ ______ ..- - -
The contact of salt and anhydrite
Probable relation of an overlying bed of
anhydrite to salt after flowage of the salt -
Variations in thickness of cap rock --_-
Presence or absence of cap rock ------------------
Acknowledgments-- - - - - -- - - --ILLUSTRATIONS
PLATE 24. Figure 1. General view of a band of impure
salt, carrying disseminated anhydrite crys-
tals, from one of the Five Islands salt
domes, Louisiana. Figure 2. Polished face
of same specimen enlarged-...._-_- _ - _ _ -_-.. _ _
25. Figure 3. Anhydrite crystals residual from
the solution of salt from shaft on Hockley
salt dome, Texas. Figure 4. Anhydrite
crystals residual from the solution of the
band of impure salt illustrated in figures
1 a n d 2 _- - - - - - - - - - - - - - -_ _ _ _ -_ _ _ _ _ _ _ - - -
26. Figures 5 and 6. General views of a specimen
of salt with lenses of disseminated anhydrite
from Brenham salt dome, Texas. Figure 7.
Detail of polished face of same specimen - -
27. Figure 8. Contact of banded anhydrite cap
rock and salt from Hockley salt dome,
Harris County, Tex _
28. Figure 9. General view of thin section 5 from
preceding specimen, showing the contact
of the lowest anhydrite band with the one
above it. Figure 10. General view of thin
section 2 of same specimen, showing the
contact of two higher bands - .. _- _ _- _ _ _- _
29. Figure 11. Detail of preceding thin section 2
showing the irregular distribution of im-
purities along the contact of two bands - -
30. Figures 12 and 13. Detail of thin section 5
showing slight strain and crushing along
contact of bands_------____-____-----
31. Figures 14 and 15. Detail of figure 10, showing
straining, but without appreciable crushing,
within a katatectic band._ - _-.- . - _- .._.....
1IPage
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103PLATE 32. Figures 16 and 17. Detail of thin section 2
showing a crushed patch not along the
contact of two bands-----------_---___-
33. Figures 18 and 19. Detail of figure 11 show-
ing carbonate and crushing along the
contact of two bands - -_-- _- ._---_
34. Figure 20. Solid primary sedimentary anhy-
drite rock with no recognizable stratifica-
tion seams. Figure 21. A large fragment
of primary sedimentary* ydrite with un-
usually clear and pronounced but widely
spaced stratification seams showing distor-
tion. Figure 22. A core consisting appar-
ently almost entirely of primary sedi-
mentary anhydrite rock but very much
brecciated. Figure 23. Largest single
piece of well-stratified primary sedimentary
anhydrite rock encountered in diamond-
drill core _ - -- ___ ___ ___ ___
35. Figure 24. An unusually long core showing
primary katatectic anhydrite cap rock
with unusually long intervals showing
little or no katatectic banding adjacent
to well-defined katatectic bands. Figure
25. Specimen showing considerable thick-
nesses of primary katatectic anhydrite
cap rock, with little or no recognizable
banding, in association with pronounced
katatectic banding- ---
36. Figures 26 and 27. Specimen from contact of
salt and anhydrite cap rock on Bay St.
Elaine salt dome, Terrebonne Parish, La_ _Page
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Goldman, Marcus I. Origin of the Anhydrite Cap Rock of American Salt Domes, report, 1933; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc784444/m1/2/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.