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The Talladega Slate Belt

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Presentation on theme: "The Talladega Slate Belt"— Presentation transcript:

1 The Talladega Slate Belt
By Steven Stokes, Daniel Rollins, Matthew Sahawneh, Krystal Russell, and Ashley Stewart

2 Where We’re Going Cheaha State Park
Located in northern Clay and southwestern Cleburne counties May 20-25

3 Location: North-Eastern Alabama Near the town of Sylacauga, Alabama


5 Talladega Slate Belt Composed primarily of low-grade metamorphic rocks
Bounded to the Northwest by a foreland fold and thrust fault system known as the Talladega fault or the Columbiana fault To the southeast is marked by high grade metamorphism caused by both the Hollins Line fault and the Goodwater-Enitachopco fault system.

6 Talladega Slate Belt Alleghanian thrust sheet
Metamorphosed to lower green schist facies during the Acadian orogeny and thrust above the foreland fold and thrust belt. Believed to be associated with main pulse of Early to Middle Devonian Acadian orogeny.

7 Sequences Composed of 4 lithologic groups Hillabee Greenstone
Sylacauga Marble Talladega Kahatchee Mountain

8 Hillabee Greenstone 2.6 kilometers thick Ordovician Age 457m.y.
Greenstones and Greenschists What is a greenstone? Bulk of sequence Albite, Actinolite, Epidote, Zoisite, Clinozoisite, and Chlorite Tabular and extrusive

9 Sylacauga Marble Jumbo Dolomite at base Dolomite and Calcite marbles
Nature of Dolomite Nature and use of marble

10 Sylacauga Marble Below Lay Dam Formation of Talladega Group
Unconformity between the two Diamictites What is diamictite? Lack of fossils make age correlation difficult Cambrian to Ordovician

11 Talladega Group Clastic Divided into several formations
Lay Dam Formation Cheaha Quartzite Member Erin Slate Member Butting Ram Sandstone Jemison Chert

12 Lay Dam Formation Overlies Sylacauga Oldest
Silurian to Lower Devonian. Greenish-gray, slightly calcareous sericite phyllites and slates Sandstone bodies small, grade into phyllites Rapid deposition.

13 Cheaha Quartzite Member
Metasandstone in Lay Dam Formation Sandy phyllites and coarse grained quartzites Fines upward Devonian Primary Structures Horizontally bedded, graded intervals Low angle pebbles structures Channel fill deposits Tabular and trough bedding

14 Erin Slate Member Also member of Lay Dam Formation
Thick highly carbonaceous phyllites or slate Less mature than Cheaha Quartzite member Lagoon depositional environment

15 Butting Ram Sandstone Thin green chloritic, arkosic metasandstone
Subrounded to rounded quartz sand Feldspathic Tidal channel deposits Very discontinuous Points of elevated crests

16 Jemison Chert Interval
Above Butting Ram Sandstone Interbedded white, paper thin quartzites Intercalated with black graphitic phyllites of Erin Slate White to pale light gray, very dense, very fined quartzite Complexly folded Intense deformation Lower Devonian

17 Kahatchee Mountain Group
Named Mountain Group because it can be found in the mountains northwest of Syllacuaga. Width is highly variable. Carboniferous in age. (Spores found that indicate carboniferous in metamorphic frontblock of sequence)

18 Formations within the Kahatchee Mountain Group
Waxahatchee Slate Brewer Phyllite Wash Creek Slate Sawyer Limestone *Chilton Fault

19 Deformational Phase 1 – D1
F1 folds are invariably tight to isoclinal Interlimb angle is 20 to 0 degrees They are assymetric with stort limbs are 20% shorter than long limbs It has S1 foliations

20 Deformational Phase 2 and 3
F2 folds can be only seen in thin section F3 folds are small folds 1mm to 1cm F3 they distort both the compositional layers F3 crenulation fold axial plane with S1-S2 surface

21 Deformational Phase 4 – D4
F4 folds can be seen on regional map F4 folds cut through the F1 folds F4 axial plane strikes northwest to southeast A major faulting event

22 Questions?

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