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- W2246227445 abstract "ABSTRACT The Middle Proterozoic Coal Creek Serpentinite (1.2 - 1.0 Ga) of the southeastern Llano Uplift, Gillespie County, Texas, is the only known serpentinite of Grenville age and is a critical part of tectonic models for Texas and North America during the Precambrian. The Coal Creek Serpentinite is considered to be the altered remnant of the ultramafic tectonite portion of an ophiolite. Detailed mapping of the Coal Creek Serpentinite and adjacent Packsaddle Schist and Big Branch Gneiss has demonstrated that the serpentinite and adjacent rocks have been multiply deformed synchronously with amphibolite facies metamorphism, indicating a complex post-emplacement (and perhaps emplacement) history. Folds of the pervasive NW-striking regional metamorphic foliation (layering) trend predominantly WSW and SSE. Near the contact with the serpentinite, boundinage with extension in N-S and E-W directions affects the Packsaddle Schist, recording high extensional strains. Coal Creek Serpentinite is massive, with two orientations of cross-cutting mineralogical layering, to schistose, with up to four foliations. Chloritized Coal Creek Serpentinite shows two crenulation cleavages that correspond in orientation to folds within the Packsaddle Schist. The polyphase deformation of the Coal Creek Serpentinite is consistent with the complex synmetamorphic deformational history documented elsewhere in the Llano Uplift. If the Coal Creek Serpentinite is indeed evidence of Grenville-age subduction, its subsequent deformation history requires collision of an island-arc or continental mass with the Texas craton prior to 1.0 Ga. End_of_Record - Last_Page 582-------" @default.
- W2246227445 created "2016-06-24" @default.
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- W2246227445 date "1988-01-01" @default.
- W2246227445 modified "2023-09-24" @default.
- W2246227445 title "Abstract: Tectonic Implications of the Polydeformed Middle Proterozoic Coal Creek Serpentinite, Llano Uplift, Texas" @default.
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