Hydrogeology of the Cenozoic igneous rocks, Navajo and Hopi Indian Reservations, Arizona, New Mexico, and Utah

Abstract

Volcanic rocks _____________________________________ _ Monchiquite province __________________________ _ Minette province ______________________________ _ Basalt province ________________________________ _ Hydrology of the volcanic rocks _____________________ _ Diatremes ____________________________________ _ Chemical quality of the ground water ____________ _ Development of ground water ___________________ _ Literature cited ___________________________________-_ ILLUSTRATIONS FRONTISPIECE. Photograph of Boundary Butte, one of the isolated volcanic necks in the Navajo country. PLATE 1. Map showing distribution of the Cenozoic igneous rocks and the location of selected wells and springs, Navajo

Implications of the Miocene(?) Crooked Ridge River of northern Arizona for the evolution of the Colorado River and Grand Canyon

“…Another indirect method involves Wildcat Peak (Fig. 3), a monchiquite intrusive that is part of the Tuba volcanic fi eld (Akers et al, 1971). Wildcat Peak has the same lithology as volcanic rocks in the Hopi Buttes, which have been dated at 6-8.5 Ma (Damon and Spencer, 2001).…”

Geochemical constraints on mantle-melt sources for Oligocene to Pleistocene mafic rocks in the Four Corners region, USA

“…The Navajo volcanic field is distinguished by diatreme pipes and related maar craters, plugs, and shallow intrusive masses that span the eastcentral margin of the Colorado Plateau (Figs. 1 and 2) (Gregory, 1917;Williams, 1936;Appledorn and Wright, 1957;Akers et al, 1971;Naeser, 1971;Laughlin et al, 1986;Nowell, 1993;Gonzales et al, 2010). The latest Miocene alkaline mafic flows of the Hopi Buttes are exposed southwest of the Navajo volcanic field (e.g., Fitton et al, 1988;Alibert et al, 1986) (Fig.…”

Petrographic and Geochemical Constraints on the Provenance of Sanidine‐Bearing Temper in Ceramic Potsherds, Four Corners Region, Southwest USA

“…The NVF contains approximately 100 Oligocene diatreme pipes (Naeser, 1971;Roden, Smith, & McDowell, 1979;Laughlin et al, 1986;Nowell, 1993;Gonzales et al, 2010;Nybo, McIntosh, & Semken, 2011) and related maar craters, plugs, and shallow intrusive masses (Gregory, 1917;Williams, 1936;Appledorn & Wright, 1957;Thornbury, 1965;Akers, Shorty, & Stevens, 1971). The NVF contains approximately 100 Oligocene diatreme pipes (Naeser, 1971;Roden, Smith, & McDowell, 1979;Laughlin et al, 1986;Nowell, 1993;Gonzales et al, 2010;Nybo, McIntosh, & Semken, 2011) and related maar craters, plugs, and shallow intrusive masses (Gregory, 1917;Williams, 1936;Appledorn & Wright, 1957;Thornbury, 1965;Akers, Shorty, & Stevens, 1971).…”

“…Mafic to ultramafic plutonic and volcanic rocks in the NVF are the only known source of the poikilitic-sanidine temper. The NVF contains approximately 100 Oligocene diatreme pipes (Naeser, 1971;Roden, Smith, & McDowell, 1979;Laughlin et al, 1986;Nowell, 1993;Gonzales et al, 2010;Nybo, McIntosh, & Semken, 2011) and related maar craters, plugs, and shallow intrusive masses (Gregory, 1917;Williams, 1936;Appledorn & Wright, 1957;Thornbury, 1965;Akers, Shorty, & Stevens, 1971). These igneous features are sporadically exposed over an area of 30,000 km 2 .…”