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Geochemistry of Mafic Magmas in the Hurricane Volcanic Field, Utah

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Geochemistry of Mafic Magmas in the Hurricane Volcanic Field, Utah Geochemistry of Ma®c Magmas in the Hurricane Volcanic Field, Utah: Implications for Small- and Large-Scale Chemical Variability of the Lithospheric Mantle Eugene I. Smith, Alexander Sa nchez, J. Douglas Walker,1 and Kefa Wang1 Center for Volcanic and Tectonic Studies, Department of Geoscience, University of Nevada, Las Vegas, Nevada 89154-4010, U.S.A. (e-mail: [email protected]) ABSTRACT Low-silica basanite, basanite, and alkali basalt lava ¯ows and cinder cones make up the late Quaternary Hurricane volcanic ®eld (HVF) in the Colorado Plateau/Basin and Range transition zone of southwestern Utah. Strombolian- and Hawaiian-style eruptions produced thin (10 m) a'a lava ¯ows and 10 cinder and scoria cones that group geo- graphically into ®ve clusters. The ®ve clusters can be further divided into four isotopic magma types that vary in 87 86 206 204 Sr/ Sr from 0.7035 to 0.7049, eNd from 1.6 to 27.5, and Pb/ Pb from 17.4 to 18.7. Except for the Radio Towers and Volcano Mountain cone clusters, each volcano had a different parent magma and evolved by fractional crystal- lization of different amounts and proportions of olivine and clinopyroxene. Parent magmas of each isotope group formed by 0.5%±7% partial melting of lithospheric mantle composed of fertile lherzolite varying in garnet content from 1 to 4 wt %. New 40Ar/39Ar dates indicate that the HVF formed over a period of at least 100 ka during the late Quaternary. Along a transect from the Basin and Range to the Colorado Plateau, the source for Pliocene±late Qua- ternary alkali basalt magmas changes from asthenosphere in the Basin and Range to lithospheric mantle on the Colorado Plateau. The melting of a heterogeneous lithospheric mantle is the most viable mechanism for producing the observed chemical variability in the transition zone±Colorado Plateau part of the transect. Furthermore, chemical differences across the transect may re¯ect a major lithospheric boundary originally de®ned on the basis of Nd and Pb isotopes that is older and perhaps more fundamental than the present structural and physiographic boundary between the Basin and Range and Colorado Plateau. Introduction Geochemical studies of Tertiary to recent ma®c 1954; Luhr and Carmichael 1985; McBirney et al. volcanoes over the past 25 yr have mainly focused 1987; Bradshaw and Smith 1994; Perry and Straub on large volume eruptions that occur on ocean is- 1996). lands, in ¯ood basalt provinces, and on or near oce- This article represents a continuation of our anic spreading centers. Few have concentrated on work to understand the petrogenesis of small-vol- low-volume continental cinder cones and related ume volcanic systems (e.g., Feuerbach et al. 1993; ¯ows. In western North America a much larger ef- Bradshaw and Smith 1994; Yogodzinski et al. 1996). fort has been expended to understand regionwide It addresses the petrogenesis of ma®c lavas of the chemical and isotopic patterns of Pliocene and Hurricane volcanic ®eld in the transition zone be- Quaternary ma®c volcanism than to study individ- tween the Colorado Plateau and the Basin and ual small-volume ®elds or volcanoes. Nevertheless, Range province (®g. 1). Our study focuses on several those few studies of individual cinder cones and cone clusters within the ®eld to identify chemical related ¯ows showed that lavas and pyroclastic differences between closely spaced volcanoes, products can be chemically complex (e.g., Wilcox chemical complexity of individual volcanic cen- ters, and changes in chemistry with time. Our goals Manuscript received August 27, 1998; accepted March 16, are to determine the processes that control com- 1999. 1 Isotope Geochemistry Laboratory, Department of Geology, positional variation in small-volume ma®c centers University of Kansas, Lawrence, Kansas 66045, U.S.A. and to detect changes in the composition of mantle [The Journal of Geology, 1999, volume 107, p. 433±448] q 1999 by The University of Chicago. All rights reserved. 0022-1376/1999/10704-0004$01.00 433 434 E. I. SMITH ET AL. Figure 1. The Hurricane volcanic ®eld is composed of ®ve cone clusters outlined by rectangles: Cinder Pits, Radio Towers, Volcano Mountain±Ivan's Knoll, Grass Valley, and the Divide. Journal of Geology LITHOSPHERIC MANTLE CHEMICAL VARIABILITY 435 sources beneath the Colorado Plateau/Basin and Range transition zone. Cinder Cone Clusters and Geochronology Ten cinder cones and associated ¯ows make up the Hurricane volcanic ®eld (®g. 1). Cinder cones range in size from 200m # 1 km ( height # base diame- ter) at Volcano Mountain to 75m # 300 m (height # base diameter) at Ivan's Knoll. The 10 cinder cones group geographically into ®ve clusters with a minimum total volume of about 0.5 km3 (®g. 1); volumes of individual cinder cone clusters range from 0.05 to 0.30 km3. Cones consist of bed- ded vesicular lapilli, bombs, and blocks. Aerody- namically shaped bombs (up to 2 m) and welded spatter (agglutinate) form massive to bedded de- posits that dip outward (away from the summit cra- ter) on the ¯anks and dip inward (toward the sum- mit crater) near the summits of the cones. Agglutinate consists of ribbon bombs and rootless ¯ows. Lava lakes represented by thinly bedded ba- salt ¯ows and agglutinate (2±5-cm-thick beds with a total thickness of 3±5 m) occur on the summit of Ivan's Knoll, a cone in the Cinder Pits cone cluster, and on the Grass Valley cone (®g. 1). The Volcano Mountain cone cluster contains two cones, Vol- cano Mountain and Ivan's Knoll. Lava ¯ows are thin (10 m), mainly a'a, and vary in length from 1 to 7 km. A lava ¯ow (353 5 45 ka, 40Ar/39Ar iso- chron date; ®g. 2A) chemically and isotopically cor- related to Ivan's Knoll underlies the town of Hur- ricane and is offset by the Hurricane fault. This ¯ow was previously dated by Damon (cited by Best et al. 1980) at289 5 86 ka (K/Ar). The youngest ¯ows from Volcano Mountain (258 5 24 ka, 40Ar/ 39Ar isochron date; ®g. 2B; table 1; table 1, along with tables 5±8, is available from The Journal of Geology free of charge upon request) breached the northeast ¯ank of the cone. We attempted to date the youngest event in this cone cluster by analyzing a sample from an aerodynamically shaped bomb at the summit of Volcano Mountain. The age spec- trum for this sample has a saddle shape (®g. 2C). The lowest step has an apparent age of 270 5 50 ka (®g. 2C). The isochron date for steps 1±8 is 129 5 60ka with an 40Ar/39Ar of 301.5 5 2.4 (2j; ®g. 2C). All that can be concluded from these data is that the maximum age of this sample is 270 5 50 ka. Although there is some uncertainty, geo- Figure 2. Age spectra and isochron plots for three sam- morphic and geochronologic information indicate ples from the Volcano Mountain±Ivan's Knoll cone clus- 4 5 that volcanism continued for 10 ±10 yr at the Vol- ter. A, Sample 6-15 is a ¯ow just east of Hurricane, Utah, cano Mountain cone cluster. Table 2 summarizes correlated to Ivan's Knoll. Samples 7-21 (B) and 7-22 (C) geomorphic features and ages for cone clusters of are from a ¯ow and bomb, respectively, from the Volcano the Hurricane ®eld. The table also compares Ham- Mountain cone. 436 E. I. SMITH ET AL. Table 2. Summary of Geochronology and Cinder Cone Morphology in the Hurricane Area Hamblin's stage Location Geomorphic features Age (ka) 2a Remnants Vent eroded away; ¯ows eroded into segments 2b Ivan's Knoll; ¯ow that underlies Scoria eroded away; ¯ow margins eroded 353 5 45 (¯ow) Hurricane Valley 3 Volcano Mountain/Ivan's Knoll Flows are not segmented by erosion 3a, b Grass Valley Flows are not segmented by erosion 4a Volcano Mountain; Cinder Pits; Cones have vertical rills; ¯ows close to Radio Towers original shape 4b Upper Volcano Mountain ¯ow; the Fresh surface morphology; ¯ow margins 258 5 24 (Vol- Divide intact cano Moun- tain ¯ow) blin's (1970) geomorphic stage classi®cation, com- spectively). Only alkali basalts are both nepheline monly used in the western Colorado Plateau area, and hypersthene normative (®g. 3B). with geomorphology and absolute age. The incompatible elements Ba, Sr, Th, and Nb decrease as SiO2 wt % increases when considering all rock types (®g. 4). For example, low-silica bas- Geochemistry anites (SiO2 at 42 wt %) contain about 80 ppm Nb and alkali basalts (SiO2 at 48±50 wt %) have 10±30 Geochemistry and Petrography of Ma®c Rocks of the ppm Nb. Normalized to ocean island basalt (OIB; Hurricane Volcanic Field. Olivine phenocrysts Fitton et al. 1991), all rock types from Hurricane dominate in volcanic rocks from the Hurricane vol- are enriched in large-ion lithophile (LIL) and light canic ®eld and rarely make up 110%±25% of the rare-earth elements (LREE), relative to the high rock volume. Phenocrysts vary from equant 1 mm ®eld strength elements (HFSE) and the heavy rare- euhedral grains to 3mm # 6 mm laths. Spinel oc- earth elements (HREE; ®g. 5). The only elements curs in the matrix and as small inclusions in oli- that show signi®cant depletion when compared to vine. Iddingsite rims on olivine are common in the OIB are Rb and Nb for all rock types, plus K for ¯ows from the Remnants and can also be found on low-silica basanite. Although there is signi®cant some olivine phenocrysts from Ivan's Knoll and as- variation between major rock groups, incompatible sociated ¯ows.
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