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Showing 1 to 4 of 4 for “"Igneous Intrusion"”.
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Geology of the Willow City-Eckert area, Gillespie County, Texas
… events of the region were deformation and igneous intrusion antedating Upper Cambrian, doming in Paleozoic time, and faulting in or preceding Strawn time. The major faults trend northeast-southwest. The formations represented are the Edwards, Comanche Peak, and Basement Sands of the …
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Petrographic Analysis of an Early Cenozoic Breccia from the Tinton Area, Northern Black Hills, South Dakota
… of diverse rock types set in a fine-grained igneous matrix with a chemistry in the quartz latite to rhyodacite range. The rock types present within the clasts are, in order of decreasing abundance: pegmatite, amphibolite, monzonite porphyry, metamorphosed anorthosite, quartz latite, …
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GEOCHEMISTRY OF THERMALLY ALTERED COALS AND ORGANIC-RICH SHALES: THE IMPACT OF RAPID HEATING ON PHYSICAL AND CHEMICAL PROPERTIES OF ORGANIC MATTER
Igneous intrusion can change the geochemical and petrographic properties of sedimentary organic matter (such as coals and organic-rich clays or shales) including vitrinite reflectance, maceral petrographic composition, mineralogy, stable isotope composition, trace element composition, and bulk …
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Geometry and construction history of a complex intrusive center in the shallow crust, Mount Pennell, Henry Mountains, Utah
Large igneous intrusions grow from incremental emplacement of relatively small batches of magma. The Henry Mountains have been the subject of investigation because multiple, well-exposed intrusive centers are present on the Colorado Plateau. Mount Pennell is an asymmetric intrusive center in the …