THE PREPARATION AND CERTIFICATION OF FOURTEEN SOUTH AFRICAN SILICATE ROCKS FOR USE AS REFERENCE MATERIALS*

This report describes the preparation, analysis and certification of South African Reference Materials (SARMs) 39 to 52. These materials, which comprise a suite of rock materials originally named SAROCs, were collected from many locations within the Republic of South Africa. Nineteen laboratories in five countries used a variety of analytical techniques to provide the analytical results. The certified and tentative values that have been assigned to a number of constituents are presented in tabular form in appendices.     

Topography and ice sheet growth

This paper uses a numerical ice sheet model to investigate the role of topography in influencing ice sheet growth. The model is applied to the maritime, mid-latitude uplands of Scotland and relies on a series of assumptions about mass balance, topography, and ice flow. It is driven by an imposed pattern of temperature change. The model is able to predict effectively the extent and thickness of the Loch Lomond ice sheet, using a palaeotemperature curve based on Coleoptera assemblages. A series of experiments with a stepped, constant July air temperature depression suggests that in Scotland a change in excess of ?3·0°C is necessary to initiate ice sheet growth; that steady state ice caps build up at changes of ?3 to ? 6·5°C; and that large ice sheets build up at changes of more than ? 6·625°C. The bifurcation revealed by the last two types of behaviour is the result of topography. Both the vertical amplitude and the spatial distribution of bedrock basins and ridges are important in determining the pattern, rate, and extent of ice sheet growth. The implication is that topography plays an important role in determining the dynamics of ice sheet growth.     

Geography's role in general education in the United States

In the United States, geography is taught most frequently in the junior secondary schools, is somewhat more limited as a regular course in the senior secondary schools, and is a prominent discipline within many college and university programs of instruction. At the secondary school level, geography is usually integrated within the broader based social studies, while at the college and university level it has an important function both within general education as well as specialized training. At the pre-collegiate and collegiate levels geography has developed quite independently at times, and at other times there has been a close relationship that has benefitted both levels of education. At the end of the 1980s decade, considerable cooperation was underway in the United States between teachers of secondary school and tertiary level geography in order to upgrade and enhance the discipline. In the first part of this paper, a general history of geography within American education is presented. The second part of the paper discusses geography's role within general education at the secondary and tertiary levels, including the academic backgrounds for teachers. The way in which geographic education in the United States provides students with the opportunity to study holistic relationships between people and the environment and its importance to informed citizenship are discussed in the final section of the paper.     

The geochemistry of exinites—1. Evaluation of spectral fluorescence of a series of modern resins and fossil resinites

A series of six fossil resins and four modern resins have been analysed using microscope-based spectral fluorescence methods, in addition to a preliminary study of the chemical composition of these samples using infrared spectroscopy and pyrolysis-gas chromatography. This study illustrates problems encountered during the measurement of spectral fluorescence of resins and resinite kerogens using conventional microscopy methods. Most notable, alteration of fluorescence significantly influences spectral measurements. Further, fossilized resins within rocks are complex mixtures of resinite and bitumen. Pre-extraction of resinites prior to petrographic analysis resulted in somewhat more uniform spectral fluorescence results.Spectral fluorescence of recent resins used in this study could be used to distinguish angiosperm from gymnosperm derived resinite kerogens. Distinction of plant class source of resinite kerogens, however, is more difficult using this method and is considered genarally unreliable.     

Molecular genetic markers and maturity indices in intermontane lacustrine facies: Kishenehn formation, Montana

Molecular markers have considerable promise as thermal maturation indicators in source rocks having a well-defined depositional environment. This occurs in the Kishenehn Formation (northwest Montana and southeast British Columbia), an Oligocene unit comprised of fluvial and lacustrine shales. Up to 3 km of these non-marine sediments were deposited in a 900 sq.km elongated half graben atop the Precambrian rocks of the Lewis Thrust sheet. Specific outcrops of the Coal Creek Member of the Kishenehn Formation are known to contain excellent potential source rocks, including extensive oil shales. The source rock potential and molecular marker geochemistry of most of the major Kishenehn outcrops have now been investigated, and regional results are presented in this paper.source rock analysis of a regional suite of Kishenehn samples indicates excellent petroleum potential (immature Type I kerogen) throughout the basin. Several classes of distinctive diagenetic molecular markers occur within the Coal Creek Member of the Kishenehn Formation, including diasterenes, spirosterenes, methylspirosterenes, B-ring monoaromatic anthrasteroids, ββ-hopanes and moretanes. Molecular markers indicative of non-marine deposition include dehydroabietane (conifer input) and an onocerane recently identified in leaf fossils of Miocene lacustrine beds in adjacent Idaho. Triterpane ratios are significantly more sensitive than vitrinite reflectance methods in assessing thermal maturation in the Kishenehn, and are successfully used in this study to order outcrop locations according to thermal maturity level. The systematic variation of specific markers with increasing thermal maturation suggests that molecular correlation is feasible, and could provide a method of assessing stratigraphic continuity in the basin.     

Water contents, temperatures and diversity of the magmas of the catastrophic eruption of Nevado del Ruiz, Colombia, November 13, 1985

The petrology of the highly phyric two-pyroxene andesitic to dacitic pyroclastic rocks of the November 13, 1985 eruption of Nevado del Ruiz, Colombia, reveals evidence of: (1) increasingly fractionated bulk compositions with time; (2) tapping of a small magma chamber marginally zoned in regard to H₂O contents (1 to 4%), temperature (960–1090°C), and amount of residual melt (35 to 65%); (3) partial melting and assimilation of degassed zones in the hotter less dense interior of the magma chamber; (4) probable heating, thermal disruption and mineralogic and compositional contamination of the magma body by basaltic magma “underplating”; and (5) crustal contamination of the magmas during ascent and within the magma chamber. Near-crater fall-back or “spill-over” emitted in the middle of the eruptive sequence produced a small pyroclastic flow that became welded in its central and basal portions because of ponding and thus heat conservation on the flat glaciated summit near the Arenas crater. The heterogeneity of Ruiz magmas may be related to the comparatively small volume (0.03 km³) of the eruption, nearly ten times less than the 0.2 km³ of the Plinian phase of Mount St. Helens, and probable steep thermal and P_H2O gradients of a small source magma chamber, estimated at 300 m long and 100 m wide for an assumed ellipsoidal shape.     

Uniform-hazard response spectra—An alternative approach

An alternative method is presented for generating uniform-hazard response spectra making use of a seismic hazard curve expressing annual probability of exceedance as a function of Peak Ground Acceleration (PGA), a set of normalized (PGA = 1g) mean response spectra, and a coefficient-of-variation function for the random normalized spectral values in terms of period T. The practice of using mean + 1σ normalized response spectra, scaled to specified PGA levels, is discussed and associated mean return periods are evaluated.     

U.S. Bank Failures and Regional Economic Structure*

U.S. commercial bank failures approached historically high levels in the 1980s. The collapse of such institutions can have severe impacts on local economies, disrupting the supply of available investment credit. This paper situates bank failures within the broader transformation of global capitalism in the late 20th century. Next, it reviews the causes of bank insolvency, including mismanagement, deregulation, the glutted commercial real estate market, and depressed agricultural and petroleum-dependent local economies. It then illustrates multiple aspects of the spatial distribution of bank failures. A pooled time-series regression analysis, using primary causal variables as well as location quotients of state output in four industrial sectors, indicates that with the vital exception of petroleum, and to a lesser extent services, regional economic structure is not strongly related to bank failures. This finding likely reflects the structural and spatial transformation of the industry as it adapted to the highly competitive conditions of the last decade.     

Employment Trends in Geography,Part 1: Enrollment and Degree Patterns*

This paper is the first in a series of three papers dealing with the current and future labor market for geographers. It is based on a report prepared by the Association of American Geographers' (AAG) Employment Forecasting Committee to the National Research Council's (NRC) Rediscovering Geography Committee. This report provides a data-based analysis of the past and future supply of geographers, the current labor market conditions in the field, and the factors likely to influence the future demand for geographers (faculty hiring, geographic education initiatives, trends in private-sector jobs, etc.). Each year some 4,000 individuals receive degrees in geography from America's institutions of higher education. They, or some portion of them, make up the new supply of geographers entering the labor market. In the near future (up to five years), the availability of new geographers is related to the number of geography students now in the educational pipeline. Their current specialties, and the specialties of the programs from which they come, tell us about the types of skills and the kinds of interests to be held by future labor force entrants. In the longer term (five to ten years), the number of new geographers will be influenced by geographic education initiatives at the precollegiate level. More and better geographic instruction in elementary and secondary schools will expose more students to geography as a field of study and as a potential career path. The purposes of this paper are to (1) review degree and enrollment trends in geography, (2) assess the “trickle-up” effects of geographic education initiatives at the precollegiate level, and (3) investigate the characteristics of future supply as evidenced by the types of occupations for which geography departments are now preparing students.