[en] Published in summary form only

[en] The Serra Dourada granite is related to one of the various large tin-bearing domic structures that occur in central-eastern Goias, where rocks of Uruacu and Brasilia folded belts and of Goias median massif crop out. The present study was undertaken in the southern part of Serra Dourada as an attempt to contribute to the petrologic, metallogenetic and stratigraphic aspects of the granitic rocks present in that region. The methodological approach consisted of the preparation of a 1:45.000 geological map and included the obtention of petrographic, ore microscopic and geochronological data, as well as the determination of major element concentrations in rocks and some minerals. Trace elements were only determined for rocks. (author)

[en] A detailed description of the title pluton is presented. (P.A.)

[en] The Spent Fuel Test-Climax (SFT-C) was located 420 m below surface in the Climax Stock granite on the Nevada Test Site. The test was conducted under the technical direction of the Lawrence Livermore National Laboratory (LLNL) as part of the Nevada Nuclear Waste Storage Investigations (NNWSI) for the US Department of Energy. Eleven canisters of spent nuclear reactor fuel were emplaced, along with six electrical simulators, in April-May 1980. The spent fuel canisters were retrieved and the electrical simulators de-energized in March-April 1983. During the test, just over 1000 MW-hr of thermal energy was deposited in the site, causing temperature changes 100⁰C near the canisters, and about 5⁰ in the tunnels. More than 900 channels of geotechnical, seismological, and test status data were recorded on nearly continuous basis for about 3-1/2 years, ending in September 1983. Most geotechnical instrumentation was known to be temperature sensitive, and thus would require temperature compensation before interpretation. Accordingly, a 10-in. reel of digital tape was off-loaded and shipped to Livermore every 4 to 8 weeks, where the data were verified, organized into 45 one-million-word files, and temperature corrected. The purpose of this report is to document the receipt and processing of the data by LLNL Livermore personnel, present facts about the history of the instruments which may be important to the interpretation of the data, present the data themselves in graphical form for each instrument over its operating lifetime, document the forms and locations in which the data will be archived, and offer the data to the geotechnical community for future use in understanding and predicting the effects of the storage of heat-generating waste in hard rocks such as granite

[en] Short communication

[en] Granites are of widespred occurrence in the South German Variscides (F.R. of Germany), the Black Forest (=BF), and the NE Bavarian Basement (=NEBB). These areas are crossed by the Saxothuringian-Moldanubian plate boundary and were also affected by crustal subdulction and nappe tectonism, both of which are thought to be responsible for granitisation and enrichment of Sn, W,U,Au, Sb,Pb,Zn,F, and Ba in veins of different kind. Heat produced by gliding of plates above each other, by decay of radioctive elements in granites as well as set free by the granites themselves caused the above-mentioned elements to be released from their protores, which formed during Late Proterozoic and Early Paleozoic rifting. These hypogene ore mineralizations may be crudely subdivided into thrustbound, granite-related and granite-induced ore deposites. During Tertiary-Quaternary these granites were exposed the pervasive weathering under subtropical conditions, so that ''U yellow ores'' and china clay deposits came into existence. The whole ore mineralization in that region may be explained by a simple four-step model: preconcentration, fracturation, activation and peneplaination. (author)

[en] Most image’ s interpreters are concerned with recognizing linear features in images. For geological purposes, faults, joints, features, dykes and geological contacts are the main linear features which must be interpreted. The linear features are formed by edges, where some edges are marked by pronounced differences in brightness and become ready recognized. This paper deals with satellite image edge detection techniques. Edge detection is the name for a set of mathematical methods which aim at identifying points in a satellite image at which the image brightness changes sharply or, more formally, has discontinuities. These points are typically organized into a set of curved line segments termed edges. Important features can be extracted from the edges of an image (e.g., corners, geological boundary, linesand curves). In this paper, a novel edge detection technique which computes edges of satellite image using two dimensional (2D) design digital filter is presented and applied on Gabal Gattar granitic batholith to enhance boundaries between granite and surrounded rocks in one hand, and between the granitic phases on another hand, as well as, enhance the shape of granitic masses, and faults, dykes, fractures cutting them. Here the proposed methodology is compared with other edge detectors. Filters (Sobel, Roberts, Prewitt, Canny and Log filters) as applied on G. Gattar granitic mass. This study reveals that the new proposed (Raafat filter) porttery the contacts and linear features more obvious than the other operators.

[en] The crystalline basement of the northern part of Central Switzerland continues into the massif of the Black Forest, where due to strong uplift and erosion this basement can be studied in surface outcrops. In the project 'Southern Black Forest' possible geological connections between the two regions are examined and similar lithological and structural situations are established. In the first part of this report, the complex geological evolution of the basement in the Black Forest is reconstructed on the base of publications of various authors. The great lithological variation of the crystalline rocks is described in some detail; a list of all granites in the studied area is given in the appendix. The main elements of the tectonic and structural history are reviewed in the second part. The basement of Southern Black Forest is subdivided into several large blocks which are separated by faults zones. Discontinuities in the basement are described in the third part of this report. The methods for investigating structures of brittle deformation and the corresponding nomenclature are summarized. Preliminary data of a detailed analysis of joints in more than 40 localities suggest the existence of well defined fracture systems. (author)

[en] Cretaceous-Tertiary sedimentary paleo-structure and lithofacies-paleo-geography in Hailar Basin are described. Taking Chenqi coal field as an example, the sedimentary facies pattern of coal-bearing series characterized by alternating sedimentation of fluviatile and lacustrine-swampy facies is reconstructed. It is pointed out that this sedimentary facies not only controls the sedimentation and distribution of syngenetic uranium mineralization, but also is a favourable place that converges uranium-bearing solution and reduces and precipitates uranium for the second time in epigenetic mineralization

[en] In this paper we describe the petrography and geochronology of rocks from two quarries near the City of Fortaleza/Ceara. One, the Pedreira Monguba, is formed, basically, by rocks of the granitic to monzogranitic type. Its isochrone age is 672 +- 46 m.y. with an initial ratio of 0.7036 +- 0.0005. Datinfs of biotite by the K/Ar method gave values of 522+- 19m.y. for the consolidation of the region. For comparison with the other components of the same morphologic unit, the Massif of Maranguape, we designed a reference isochrone with all values available from the literature (for granite, gneisses and migmatites) and obtained a straight line parallel to the first, but with a higher initial ratio of 0.709, demonstrating the strong influence of the Brasiliano Cycle in this region. The other quarry, Pedreira Pendanga, is composed of gneisses and migmatized gneisses and forms an open chemical system. It was possible, however, to verify that its age is equal or greater than 2150+- 71 m.y. and that all of its rocks have suffered strong metamorphism during the Brasiliano Cycle as in shown by the K/Ar ages of biotites of 541+- 3 m.y. A discussion of sampling problems is given and the influence of a granitic intrusion on the chemical opening of the system is evidenced. (author)