. : ONXw - .19gAIB~uf.aadi ONWI-298

GEOLOGY LW fluI FURST COPYDO NOT CIRCULATE

Surf ace Geologic Reconnaissance ofRichton Dome, Perry County, Mississippi

Technical Report

January 1983ZIMRAI J3y

JUN 17 1991

Sidney S. BrandweinRobert M. White u

Law Engineering Testing Company2749 Delk Road, S.E.Marietta, GA 30067

Offis N cer ste Isolation

BATTELLE Project Management Division

metadc957956

BIBLIOGRAPHIC DATA

Brandwein S. S., and R. M. White, 1983. Surface Geologic Reconnaissance of Richton Dome,Perry County, Mississippi, ONWI-298, prepared by Law Engineering Testing Company forOffice of Nuclear Waste Isolation, Battelle Memorial Institute, Columbus, OH.

NOTICE

This report was prepared as an account of work sponsored by an agency of the United StatesGovernment. Neither the United States Government nor any agency thereof, nor any of theiremployees, makes any warranty, express or implied, or assumes any legal liability orresponsibility for the accuracy, completeness, or usefulness of any information, apparatus,product, or process disclosed, or represents that its use would not infringe privately ownedrights. Reference herein to any specific commercial product, process, or service by tradename, trademark, manufacturer, or otherwise, does not necessarily constitute or imply itsendorsement, recommendation, or favoring by the United States Government or any agencythereof. The views and opinions of authors expressed herein do not necessarily state or reflectthose of the United States Government or any agency thereof.

Printed in the United States of AmericaAvailable from

National Technical Information ServiceU.S. Department of Commerce5285 Port Royal RoadSpringfield, VA 22161

NTIS price codesPrinted copy: A02Microfiche copy: A01

ONWI-298Distribution Category UC-70

Surface Geologic Reconnaissance ofRichton Dome, Perry County, Mississippi

Technical Report

January 1983

Sidney S. BrandweinRobert M. White

Law Engineering Testing Company2749 Delk Road, S.E.Marietta, GA 30067

The content of this report is effective as of November 1981. This report was prepared by Law EngineeringTesting Company under Subcontract E512-00400 with Battelle Project Management Division, Office ofNuclear Waste Isolation under Contract No. DE-ACO6-76-RL01830-ONWI with the U.S. Department ofEnergy. This contract was administered by the Battelle Office of Nuclear Waste isolation.

ABSTRACT

A geologic reconnaissance map was prepared of the supradomal area of

Richton Dome, Mississippi, on a scale of 1:24,000. To do this, previous work

was compiled and consolidated, and field mapping and heavy mineral analyses

took place.

iii

TABLE OF CONTENTS

Page

1 PURPOSE AND SCOPE..... .. .. ............................. ........ 1

2 PREVIOUS WORK..... .. ................................... ...... ..2

3 RECENT LETCo MAPPING.... .. .. ............................ . ... 3

4 DISCUSSION.... . ... .. ....................................... . ... 5

5 LIST OF REFERENCES CITED..... .. ......................... .... . 6

iv

LIST OF FIGURES

Page

Figure 1. Surface Geologic Investigation, Richton Dome, PerryCounty, Mississippi Geological Reconnaissance Map... ..... Pocket

1 PURPOSE AND SCOPE

The purpose of this study was to prepare a reconnaissance-level geologic

map of the supradomal area of Richton Dome, Mississippi, on a scale of

1:24,000 (Figure 1, in pocket). The scope included compiling and consoli-

dating previous work, field mapping and checking, and heavy mineral

examination.

2

2 PREVIOUS WORK

Before 1980, the only geologic map to include the Richton Dome area was

the Mississippi State geologic map (Mississippi Geological Survey, 1969) at

a scale of 1:500,000. A map was then prepared of the vicinity of Richton

Dome at a scale of 1:24,000 (Law Engineering Testing Company, 1982) by

mapping lithologic units and assigning them local names.

Other pertinent data collected during the Area Characterization Phase

(Law Engineering Testing Company, 1982) included borehole data, heavy mineral

analyses, and surface electrical resistivity surveys.

3

3 RECENT LETCo MAPPING

A geologic reconnaissance map was prepared at a scale of 1:24,000 (Fig-

ure 1). The mapping effort included compilation of existing data (Law Engi-

neering Testing Company, 1982) and coordinating these data with data gathered

during 30 days of field mapping in February to March 1981, including the col-

lection of new heavy mineral samples. Topographic maps, aerial photographs,

and the first 1:24,000 map were used for reference in the field. Where out-

crops were sparse, auger holes were dug and sampled to a depth of 3 to 4 feet.

Contacts between mapped units are not drawn on the geologic map to

emphasize the imprecise nature of the data. Because of the thick soil cover

and colluviation, few contacts are exposed, but they are known to be located

between two observation points, such as between a resistivity line and an

auger hole.

The differentiation of the Hattiesburg and Citronelle Formations was

based on a number of criteria, including field relationships, heavy mineral

suites, and their stratigraphic position as determined by borehole and electri-

cal resistivity data. A major benefit, not available to earlier map programs,

was the recognition of distinctive heavy mineral suites (Law Engineering

Testing Company, 1982). Both heavy mineral suites commonly have ilmenite,

leucoxene, kyanite, tourmaline, staurolite, and tan opaques. The Hattiesburg

suite is characterized by an abundance of pyrite and more andalusite than the

Citronelle Formation, while the Citronelle lacks pyrite and tends to contain

more tourmaline. Both mineral assemblages indicate that reworked older

coastal plain sediments are the sources. The heavy mineral suite found in

the Hattiesburg Formation at Cypress Creek Dome is different from that found

at Richton, indicating a Piedmont provenance. Different sources suggest that

a major topographic divide may have existed between Richton and Cypress Creek

Domes in Hattiesburg time.

The subject map (Figure 1) associates the previous 1:24,000 map local

lithologic units with formational units. The "Good Hope sands" and "Richton

sands and gravels" are mapped herein as the Citronelle Formation. The "Clay

Hill lutite" is mapped as either the Hattiesburg or the Citronelle Formation,

depending on the heavy mineral suite and stratigraphic position. For

example, southwest and northeast of the dome extensive areas of silty clays,

mapped previously as "Clay Hill lutite", are interpreted as belonging to a

4

Citronelle channel complex. Although indistinguishable from the Hattiesburg

Formation at the outcrop, this portion of the section contains a Citronelle

heavy mineral suite and is underlain in boreholes by a thick sequence of

sand and gravels, also containing a Citronelle suite. Beneath these sands

and gravels, a clay with a Hattiesburg heavy mineral suite is found.

5

4 DISCUSSION

The units mapped at Richton Dome, which range in age from Miocene to

Recent, include the Hattiesburg Formation, the Citronelle Formation, and

Quaternary terrace deposits and alluvium.

The surface outcrop patterns of the units do not obviously reflect the

underlying salt structure. However, the dominant outcrop pattern on the

map reflects two large Citronelle channels crossing to the southwest and

northeast of the dome and joining near the southern flank of the dome, with

the dome lying beneath the interfluve. Analysis of the pre-Pleistocene out-

crop pattern is complicated by the high relief on the Hattiesburg/Citronelle

erosional contact and the lack of outcropping marker units. No evidence of

faulting has been recognized at the surface, but there is some evidence of

displacement in the Hattiesburg Formation from subsurface data (Law Engi-

neering Testing Company, 1982).

Three terrace levels were mapped along the Bogue Homo, and two levels

were mapped along Thompson Creek. Adequate control for a detailed terrace

map was not present. Each level mapped may not represent a single terrace,

but may be a grouping of terraces within a restricted range of elevations

above the floodplain. No effort was made to correlate the terraces between

Bogue Homo and Thompson Creeks. No deformation of terrace surfaces was

observed.

This map is consistent with the structural cross sections presented in

the Mississippi Area Characterization Report (Law Engineering Testing Company,

1982, Figures 13-57 through 13-60).

6

5 LIST OF REFERENCES CITED

Law Engineering Testing Company, 1982. Gulf Coast Salt Domes Geologic Area

Characterization Report, Mississippi Study Area, Vol. VI, ONWI-120, prepared

for Office of Nuclear Waste Isolation, Battelle Memorial Institute, Columbus,

OH.

Mississippi Geological Survey, 1969. Mississippi State Geologic Map, Scale

1:500,000.

U.S. Geological Survey, 1964. Ovett, Ovett S. E., Rhodes, and Richton

Quadrangle Maps, 1:24,000.

7

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10

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ENRICO F. CONTIMICHAEL C. CULL INGFORDJ. J. DAVISJOSEPH F. DONOGHUEHIGH-LEVEL WASTE LICENSING BRANCHHIGH-LEVEL WASTE TECHNICALROBERT JOHNSONPHILIP S. JUSTUSH. E. LEFEVRELINDA L. LEHMANLIBRARYJOHN B. MA RTIN (3)HUBERT MILLERTHOMAS J. NICKOLSONEDWARD ODONNELLJAY E. RHODERICK

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