102 research outputs found

    Assessing thermal maturity through a multi-proxy approach: a case study from the Permian Faraghan Formation (Zagros Basin, Southwest Iran)

    Get PDF
    This study focuses on the thermal maturity of Permian deposits from the Zagros Basin, Southwest Iran, employing both optical methods (Thermal Alteration Index, Palynomorph Darkness Index, Vitrinite Reflectance, UV Fluorescence) and geochemical analyses of organic matter (Rock Eval Pyrolysis and MicroRaman spectroscopy) applied to the Faraghan Formation along two investigated Darreh Yas and Kuh e Faraghan surface sections. Furthermore, an integrated palynofacies and lithofacies analysis was carried out in order to integrate the few studies on the depositional environment. The Faraghan Formation, which is widely distributed in the Zagros area, generally consists of shale intercalated with sandstones and pebble conglomerates in the lower part, followed by a succession of sandstone, siltstone and shaly intercalations and with carbonate levels at the top. The integrated palynofacies and lithofacies data confirm a coastal depositional setting evolving upwards to a shallow marine carbonate environment upwards. Rock Eval Pyrolysis and Vitrinite Reflectance analysis showed that the organic matter from samples of the Darreh Yas and Kuh e Faraghan sections fall in the mature to postmature range with respect to the oil to gas generation window, restricting the thermal maturity range proposed by previous authors. Similar results were obtained with MicroRaman spectroscopy and optical analysis such as Thermal Alteration Index and UV Fluorescence. Palynomorph Darkness Index values were compared with Rock Eval Pyrolysis and vitrinite reflectance values and discussed for the first time in the late stage of oil generation.This research was funded by PRIN (2017RX9XXXY-CIRILLI), by Fondo Ricerca di Base Department of Physics and Geology, University of Perugia (SPIRICBAS2018-SPINA), by the project “Paleontological Studies and Biozonation of Paleozoic Sediments in Central Iran and Zagros Basins” (coordinator R. Rettori) and MIUR grants-SORCI to PhD School of Science and Technology for Physics and Geology (XXXIV Cycle), University of Perugia; Project “Paleontological Studies and Biozonation of Paleozoic Sediments in Central Iran and Zagros Basins” (RETTORI).info:eu-repo/semantics/publishedVersio

    Uso del análisis digital de imágenes en las medidas de algunas características de las palinofacies de

    Get PDF
    Se  estudiaron palinofacies de  carbones de la  mina  El Bloque, del manto de la Formación Amagá,  provenientes del  terciario inferior. La preparación  de las muestras fue adaptada de  la palinología,  la observación se realizó en microscopia de luz blanca y fluorescente. El método de análisis de imagen consistió en dos  etapas: La primer etapa,  midió la fluorescencia  total  de las palinofacies,  obtenida de una imagen a color  segmentada con el método Otsu ,de la  que se extrajo, el  índice de color Verde/Rojo para cada ply del manto de carbón. Los resultados de la fluorescencia fueron comparados contra los datos obtenidos de la pirólisis Rock-Eval (S1/TOC y HI) y el porcentaje de liptinitas. La segunda etapa  evaluó algunos factores de forma y generó  las curvas de  textura morfológica, para las imágenes segmentadas, de las  dos  especies de polen estudiadas: Cyclusphaera y Spirosyncolpites, Se encontró que la intensidad de fluorescencia total,   está relacionada con los datos  de la pirólisis  Rock- Eval(S1/TOC, HI). Los factores de forma, las curvas de textura y la intensidad de fluorescencia son elementos que podrían, ser usados en la discriminación, de algunos tipos de materia orgánica presentes en las placas de kerógenos analizadas..  ABSTRACT Coal samples from a seam in the lower Tertiary Amagá Formation, “El Bloque” mine, Colombia, were used for analyzing palynofacies. Palynofacies residues obtained through the adapting palynological preparation method, were studied in white and fluorescent light.  The proposed method of image analysis consists of two steps: (1) the total fluorescence of the palynofacies was measured with a color image and binary image as a result of Otsu segmentation. A green and red (G/R) color index was measured and each level of the coal seam the G/R index ratio was compared to the results of Rock-Eval data (S1/TOC and HI) and the percentage of liptinites. (2) Some shape factors (roundness, fullness ratio, aspect ratio, and elongation) and textural curves were derived using the distance function of mathematical morphology; these were measured in two pollen species, Cyclusphaera and Spirosyncolpites, to test the techniques.  The results of these tests have shown that fluorescence intensity measured with image analysis is related to coal petrography and pyrolysis Rock-Eval data (S1/TOC, HI). The shape factors, textural curves, and fluorescence intensity together are elements that could be used in discriminating some types of organic matter in kerogen slide

    1994 OURE report, including the 4th Annual UMR Undergraduate Research Symposium -- Entire Proceedings

    Get PDF
    The Opportunities for Undergraduate Research Experience program began in 1990. This volume constitutes the proceedings of the fourth annual OURE program. The goals of the program are: (1) to expand opportunities for a more active form of learning by students; (2) to encourage the direct interaction of undergraduate students with faculty through research; (3) to expand the level of research activity on the campus; (4) to help encourage superior students to pursue graduate study; and (5) to reinforce the idea that teaching and research are compatible and mutually reinforcing at a research university. The OURE program continues to achieve its goals -- UMR students have performed research on a wide variety of topics, have worked closely with faculty and have experienced first-hand both the excitement and the frustration of performing research. This volume contains papers presented at the fourth annual UMR Undergraduate Research Symposium held on March 23, 1994, and final reports of students participating in the 1993-94 OURE program. Students in the OURE program are encouraged to participate in the Symposium and participation increased substantially this year. Through programs such as this, the University of Missouri--Rolla, Missouri’s Technological University, continues to provide opportunities for its undergraduate students to further their research experiences in preparation for their future endeavors

    The Remote Sensing-Stratigraphic Approach Applied to the Reconstruction of Holocene Sedimentary Evolution in Coastal Areas: Case Studies from Arno and Po Delta Plains (Italy)

    Get PDF
    The growing availability of open-access databases, made the RS data and analyses to be increasingly employed in several geological research areas, including Quaternary and Environmental Geology. Despite the frequent use of the RS in alluvial-coastal plains paleohydrographic reconstruction, especially to identify stagnant versus well-drained areas (i.e., past wetlands and paleochannels, respectively) by means of brightness contrasts on images, the relationship between surface RS-derived traces and shallow subsurface stratigraphy remains underexplored. The present PhD thesis represents a contribution to this open issue, through the application of a multidisciplinary approach integrating RS (optical multi/hyperspectral images and DTM LiDAR) with sedimentologic and stratigraphic field data in the study of the Holocene evolution of paleodrainages from two coastal-deltaic areas: San Rossore site (SR-Arno plain) and Mezzano Valley (MV-Po plain). The analyses of 27 scenes from Landsat, ASTER, Sentinel2a and Hyperion allowed to identify paleochannels traces in the two sites. Field surveys and soil sampling campaigns performed on selected traces to define their surface sedimentological and optical characteristics, invariabily highlighted silty-clayey composition. A cross-reference was performed between traces and the shallow subsurface (i.e., uppermost 10 m) through the collection of 26 auger and continuous core data on which facies analysis, 14C dating and stratigraphic correlations were performed that allow to identify buried (2-4m bgl) channels. Their surface visibility, connected to the soil moisture distribution, resulted to be influenced mainly by the distribution of organic-rich deposits and/or by the shallow subsurface stratigraphic architecture. The “stratigraphic calibrations” extendended along RS-detected traces suggested that during the early highstand (6000-3000 yr cal BP) the MV experienced a tidally-influenced lagoon phase with the development of 2 networks of “tidal-channels”, whose formation was favored by local factors (suh as low topographic gradient and continuous beachridges development) while, the Pisa lagoon, in the same time-interval, was gradually filled by distributary channels

    Handbook for the analysis of micro-particles in archaeological samples

    Get PDF
    Horizon 2020(H2020)677576Bioarchaeolog

    Program and Abstracts from the Celebration of Student Scholarship, 2018

    Get PDF
    Program and Abstracts from the Celebration of Student Scholarship on April 25, 2018

    2020 Program and Abstracts for the Celebration of Student Scholarship

    Get PDF
    Program and Abstracts from the Celebration of Student Scholarship held in the Spring of 2020

    Vegetation Index and Dynamics

    Get PDF
    The book contemplates different ways of approaching the study of vegetation as well as the type of indices to be used. However, all the works pursue the same objective: to know and interpret nature from different points of view, either through knowledge of nature in situ or the use of technology and mapping using satellite images. Chapters analyze the ecological parameters that affect vegetation, the species that make up plant communities, and the influence of humans on vegetation

    Stratigraphic Analysis of Layered Deposits

    Get PDF
    Stratigraphy, a branch of geology, is the science of describing the vertical and lateral relationships of different rock formations formed through time to understand the earth history. These relationships may be based on lithologic properties (named lithostratigraphy), fossil content (labeled biostratigraphy), magnetic properties (called magnetostratigraphy), chemical features (named chemostratigraphy), reflection seismology (named seismic stratigraphy), age relations (called chronostratigraphy). Also, it refers to archaeological deposits called archaeological stratigraphy. Stratigraphy is built on the concept "the present is the key to the past" which was first outlined by James Hutton in the late 1700s and developed by Charles Lyell in the early 1800s. This book focuses particularly on application of geophysical methods in stratigraphic investigations and stratigraphic analysis of layered basin deposits from different geologic settings and present continental areas extending from Mexico region (north America) through Alpine belt including Italy, Greece, Iraq to Russia (northern Asia)
    corecore