Structural state of k-feldspar in the felsic volcanic rocks and ring pluton granites of the butler hill Caldera, St. Frankois mountains, southeastern Missouri
The K-feldspar in all major rock units exposed in the Middle Proterozoic Butler Hill Caldera. St. Francois Mountains, south-eastern Missouri, shows a high, but not maximum, degree of structural order. The structural state parameter Z for phenocryst material from the felsic volcanic rock units averages 0.89, with a standard deviation of 0.06 (Z would be 1 in fully ordered microcline). K-feldspar extracted from the matrix of these same samples yields an average Z value of 0.86, with a standard deviation of 0.07. The Z parameter for the K-feldspar in the ring pluton granites averages 0.87, with a standard deviation of 0.06. The structural state of the K-feldspar in these ring pluton granites is virtually identical to that reported by our group for the Butler Hill - Breadtray Granite the subvolcanic granite massif exposed in the center of the Butler Hill Caldera. There is no statistically significant variation of K-feldspar structural state with inferred structural elevation, present topographic elevation, or proximity to the Simms Mountain Fault. We interpret the homogeneity of the K-feldspar structural state throughout the Butler Hill Caldera complex, and especially the unexpectedly high degree of structural order in the volcanic K-feldspar, as evidence for a pervasive alteration event, which re-ordered the K-feldspar throughout the entire volcanic-plutonic complex. The most likely cause of the homogenization of the K-feldspar structural state is the late-stage alkaline magmatism inferred to have occurred throughout the St. Francois Mountains at approximately 1.36 Ga.
Geography, Geology, and Planning
Alteration, Butler hill caldera, Granite, K-feldspar, Missouri, Proterozoic, Ryolite, St. Francois mountains, Structural state
Plymate, Thomas G., James D. Kendall, Lisa M. Shepard, and Kenneth C. Clark. "Structural state of K-feldspar in the felsic volcanic rocks and ring pluton granites of the Butler Hill caldera, St. Francois Mountains, southeastern Missouri." The Canadian Mineralogist 39, no. 1 (2001): 73-83.