A geologic map of the Llano Uplift.A geologic map of the Llano Uplift.
The map can be better viewed with the Adobe Acrobat plug-in.
Two non-RGP links:
The Llano Uplift, the tenured version
Texas Mesoproterozoic
I finally got around to a preliminary discussion of the origin of the Llano Uplift
Polydeformed? The Llano Uplift? You bet. [image borrowed from S. Mosher]
Enchanted Rock State Park
The Midway Sill...
Places with easy access to interesting rocks in the Llano Uplift
A) Coarse-grained pink porphyritic granites (Town Mountain Granite) in large oval or dike-like bodies, (~30% of Llano Uplift, Johnson and others, 1976)
B) Fine to medium-grained pink or gray granites in irregular bodies (~16 % of Llano Uplift, Johnson and others, 1976)
Some information about the Town Mountain Granite (TMG).
Non-porphyritic Town Mountain Granite
Town Mountain Granite marginal facies from the Katemcy Pluton.
Deformed and undeformed granite from the Grape Creek Pluton
A boudinaged pegmatite from the Wolf Mountain Intrusion.
A garnet-quartz symplectite formed in a pegmatite related to the Wolf Mountain Intrusion. I suspect it has petrological significance of some kind, and I'd appreciate any input. I've gotten a report that similar fabrics occur in southern Alaska within low-P pegmatites that intrude the Chugach Metamorphic Complex.
Reed, Robert M. (1995) Ductile deformation in granites and contact metamorphic rocks, Llano Uplift, central Texas. Geological Society of America Abstracts with Programs, 27, 2, 82-83.
Reed, Robert M. and Helper, Mark A. (1994) Evidence for solid-state deformation of ~1.1 Ga "anorogenic" granites in the Llano Uplift, Texas. Geological Society of America Abstracts with Programs, 26, 1, 25.
SEDIMENTARY STRUCTURES, PALEO-WEATHERING, AND PROTOLITHS OF METAMORPHIC ROCKS, GRENVILLIAN LLANO UPLIFT, CENTRAL TEXAS
Mostly text, at this point.
Do you have to be named "Rob" to put stuff on the WWW about the Llano Uplift? Maybe....
Rob Wilkes and Jean Hackett bring you information about the most interesting mineral occurrence in the Llano Uplift: Baringer Hill.
Abstract from Susan Anderson's eclogite thesis in the western Llano Uplift.
Abstract from Ed Lane's garnet rare-earth-elements thesis in the Llano Uplift.
Abstract from Liz Roller's Sm-Nd granite thesis in the Llano Uplift.
Some references on the Llano Uplift courtesy of the Walter Geological Library.
