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New Mexico Geological Society Spring Meeting Abstracts area. The interval transit time decreases with ry may lead to better understanding of long- increasing burial depth according to a com- lived lithospheric-scale structures and their Abstracts paction curve that has to be calibrated for influence on igneous and tectonic activity. each unit examined. Rock units that are at a depth shallower than their maximum burial GEOLOGY AND GEOCHEMISTRY OF PROTEROZOIC GRANITIC AND NMGS spring meeting depth will have a lower-than-expected inter- val travel time. Approximately 50 sonic logs MAFIC ROCKS IN THE REDROCK The New Mexico Geological Society annual from southeast Colorado and northeast New AREA, NORTHERN BURRO MOUN- spring meeting was held on April 7, 2000, at Mexico have been digitized, and estimates of TAINS, GRANT COUNTY, NEW MEXI- New Mexico Institute of Mining and the amount of erosion have been determined. CO; A PROGRESS REPORT, by Virginia Technology, Socorro. Following are the The amount of erosion in southeast Colorado T. McLemore, [email protected], New abstracts from all sessions given at that meet- predicted from this analysis ranges from ~3 Mexico Bureau of Mines and Mineral ing. km along the Sangre de Cristo Mountain Resources, New Mexico Institute of Mining and Technology, Socorro, NM Index front to 0.8 km near the Colorado–Kansas State line. 87801; O. Tapani Ramö and Paula J. Kosunen, Session 1—Tectonics, geochemistry, and volcanology Geology Department, P.O. Box 11, FIN- p. 37 PROTEROZOIC EVOLUTION OF THE 00014 University Helsinki, Finland; Matt Session 2—Permian–Pennsylvanian stratigraphy and ZUNI MOUNTAINS, NEW MEXICO: Heizler, New Mexico Bureau of Mines and tectonicsp. 39 PERIDOTITES, TONALITES, RHYO- Mineral Resources, New Mexico Institute Session 3—Hydrogeology and geomorphology p. 41 LITES, SHEAR ZONES, AND A REAC- of Mining and Technology, Socorro, NM Session 4—Geology of the Santa Fe region p. 42 TIVATION HISTORY THROUGH THE 87801; Ilmari Haapala, Geology Depart- Session 5—Paleontology p. 44 PRESENT, by Diana Strickland, ariel23@ ment, P.O. Box 11, FIN-00014 University Poster session p. 47 unm.edu, Karl E. Karlstrom, and Jane Selver- Helsinki, Finland; and Christopher McKee, stone, Department of Earth and Planetary New Mexico Bureau of Mines and Mineral Sciences, University of New Mexico, Albu- Resources, New Mexico Institute of SESSION 1—TECTONICS, GEOCHEMISTRY, AND querque, NM 87131 Mining and Technology, Socorro, NM VOLCANOLOGY The Zuni Mountains offer a rare Precambrian 87801 exposure into both the Jemez lineament and A complex Proterozoic terrain in the north- the basement of the Colorado Plateau. ern Burro Mountains consists of metamor- PATTERNS OF CENOZOIC DENUDA- Proterozoic rocks of the Zuni Mountains are phic rocks (Bullard Peak and Ash Creek TION ON THE SOUTHERN HIGH dominantly meta-igneous and can be divid- Series, 1,550–1,570 Ma, U/Pb) that are PLAINS, by Marta J. Hemmerich and Shari ed into three suites: (1) tonalite/granodiorite intruded by granitic and mafic rocks. The A. Kelley, Department of Earth and Envir- with mafic enclaves, (2) peridotite that is granitic rocks include (1) Burro Mountain onmental Science, New Mexico Institute of either a crustal cumulate or an exotic slice of granite (oldest, ~1,445 Ma, U/Pb), (2) gneis- Mining and Technology, Socorro, NM mantle, (3) quartz monzonite and rhyolite sic granite/granodiorite (~1,380 Ma, K/Ar), 87801 that represent shallow-level magmatism at (3) Jack Creek rapakivi granite (1,220.9 ± 3.5, Spatial and temporal patterns of denudation ca. 1.65 Ga (Bowring and Condie, 1982). The 1,198 ± 4.7 Ma, 40Ar/39Ar), (4) Redrock gran- on the southern High Plains of northeastern peridotite occurs as an elongate lens with ite (1,210 ± 5, 1,204.8 ± 12 Ma, 40Ar/39Ar; New Mexico, southeastern Colorado, the sheared margins that was metamorphosed 1,328 ± 58 Ma, Sm/Nd isochron), (5) fine- Texas panhandle, and western Oklahoma are and hydrothermally altered. The sheared grained alkali-feldspar and biotite granite constrained using apatite fission-track (AFT) margins of the body and the absence of asso- dikes, (6) rhyodacite/dacite porphyry dikes, thermochronology, heat flow, and sonic well- ciated mafic rocks imply tectonic emplace- and (7) pegmatite dikes (youngest). The log velocity studies. AFT and modern tem- ment prior to intrusion by the quartz mon- Redrock granite consists of four textural and perature data are combined to estimate the zonite although distance of transport is compositionally distinct phases (biotite- timing and the magnitude of cooling due to unconstrained. hornblende, hornblende, K-feldspar, and denudation on the High Plains. AFT analysis The Zuni Mountains have a remarkable miarolitic biotite granites). Approximately 50 of core samples from five deep oil wells in history of igneous and tectonic activity: Arc small anorthosite xenoliths (1,216.9 ± 5.3, the area suggest that the base of the apatite magmatism (likely 1.75–1.7 Ga), tectonic 1,228.5 ± 4.5 Ma, 40Ar/39Ar; 1,326 ± 830 Ma, partial annealing zone (PAZ) is preserved in emplacement of the sheared peridotites, and Sm/Nd isochron) are scattered in a north- the subsurface in two of the wells. The depth the intrusion 1.65 Ga granites and rhyolites east-trending zone throughout the miarolitic of the base of the PAZ below the ground sur- was followed by a younger shearing event. biotite granite. K-rich minette (1,420.5 ± 4.5 face is tabulated below: This shear zone trends west–northwest for Ma, 40Ar/39Ar; 1,135 ± 71 Ma, Sm/Nd iso- ~10 km, dips 60° south, and bends to the chron) occurs as coeval isolated enclaves, <1,230 m east-central north–northeast with a southwest-plunging New Mexico swarms of enclaves, and synplutonic dikes mineral-elongation lineation. Shear sense is within the Jack Creek rapakivi granite. (1 Latigo Ranch C) extensional (top to the southwest) often with ~825 m northeastern ~2–3 km Diabase/gabbro/diorite stocks and dikes a dextral component and occurred at temper- intruded the metamorphic and granitic New Mexico denudation atures between 400° and 500°C. An unfoliat- (Logan) rocks. The age relationships of the granites ed, megacrystic granite (likely 1.4 Ga) and minettes remain unclear and will hope- <1,800 m Oklahoma panhandle intrudes this package and is bordered by dia- (Stonebraker 1-AP) fully be resolved by additional U/Pb dating base dikes (likely 1.1 Ga) along northwest- 40 39 <3,390 m Texas panhandle of zircons. The number of Ar/ Ar age trending faults. Cambrian syenites and fluo- dates clustering about 1,200 Ma strongly sug- (Hobart Ranch 1-21) rospar veins (age unknown) are also present. ~3,074 m Anadarko Basin, ~1–1.5 km gests that a heating event or uplift occurred The area was a northwest-trending uplift dur- at that time. Geochemical and isotopic data Oklahoma denudation ing the Ancestral Rocky Mountain orogeny (Payne 1) indicate that the Redrock granite, anorth- and during the Laramide orogeny, indicating osites, Jack Creek rapakivi granite, Burro long-term Phanerozoic buoyancy. Cenozoic The AFT cooling age just beneath the Mountain granite, and metamorphic rocks volcanism produced the Mt. Taylor volcanics were derived from different protoliths. The break-in-slope on the age-depth plot is ~27 and the Zuni–Bandera basaltic fields (that Ma in northeast New Mexico and ~38 Ma in anorthosites and diabase probably tapped a contain mantle xenoliths). Both belong to the moderately depleted mantle source. The Jack the Anadarko Basin. northeast-trending Jemez lineament that is The interval transit time digitized from Creek rapakivi granite was presumably underlain by low velocity, (hot) mantle. derived from a source characterized by sub- sonic logs can be used as an independent Documentation of the Zuni Mountain’s histo- measure of the amount of denudation in an tle, long-term LREE enrichment, whereas MayMay 2000 NEW MEXICO GEOLOGY 37 that of the Redrock granite pluton was slight- TALS OF THE BISHOP AND BAN- cult scenario to physically reconcile. Clearly ly depleted. Both were clearly more juvenile DELIER MAGMA SYSTEMS, by Jeffrey the 3.70 ± 0.16 Ma age of the Bishop Tuff in (Nd model ages ~1,600 Ma) in nature than A. Winick, [email protected], Department addition to the respective 15.92 ± 0.87 Ma the metamorphic rocks of the region (Nd of Earth and Environmental Science, New and 11.41 ± 0.16 Ma ages for the lower and model ages ~1,900 Ma) and may include a Mexico Institute of Mining and upper Bandelier Tuffs are erroneous within significant Middle Proterozoic mafic lower Technology, Socorro, NM 87801; and Nelia the context of all known physical and geo- crust/subcontinental lithospheric mantle W. Dunbar and William C. McIntosh, New logical constraints on these magma systems. component. Mexico Bureau of Mines and Mineral We interpret this data as direct evidence for Resources, New Mexico Institute of 40 40 39 the presence of ArE and suggest that the AR/ AR GEOCHRONOLOGY OF THE Mining and Technology, Socorro, NM results of Van den Bogaard and Schirnick OCATE VOLCANIC FIELD, NORTH- 87801 (1995) are not geologically meaningful. As a CENTRAL NEW MEXICO, by Brian Olm- Residence timescales of silicic magma cham- result of this work, existing models of upper sted and William C. McIntosh, Department bers in the Earth's crust are poorly known. crustal magma residence times may need to of Earth and Environmental Science, New Some recent determinations of these time- be revised. Mexico Institute of Mining and Techno- scales, based on 40Ar/39Ar analysis of quartz- logy, Socorro, NM 87801 hosted melt inclusions, may be flawed due to QUARTZ XENOCRYSTS IN A HIGH-SILI- 40 39 Preliminary Ar/ Ar dating of the Ocate 40 CA RHYOLITE MELT: THE EL CAJETE the problem of excess argon ( ArE) in volcanic field along with previous K–Ar dat- trapped melt.
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