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Wyświetlanie 1-3 z 3
Tytuł:
The extent and volcanic structures of the Quaternary Andahua Group, Andes, southern Peru
Autorzy:
Gałaś, A.
Powiązania:
https://bibliotekanauki.pl/articles/191656.pdf
Data publikacji:
2011
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
lava dome
pyroclastic cone
minor volcanic centres
Andahua group
Peruvian Andes
Opis:
The Quaternary Andahua volcanic group in southern Peru has been studied by present author since 2003. The Andahua Group stretches out at intervals within an area, which is 110 km long and 110 km wide. Seven regions bearing centres of volcanic eruptions have been distinguished: the Valley of the Volcanoes, Antapuna, Rio Molloco, Laguna Parihuana, Rio Colca Valley, Jaran, and Huambo. The Valley of the Volcanoes, where the Andahua Group was identified for the first time, contains the biggest variety of volcanic landforms. The valley is covered by a nearly 60 km long, continuous cover of lava flows. 165 individual eruption centres of the Andahua Group were distinguished including apparent pyroclastic cones, 50–300 m high, and usually smaller lava domes and fissure vents. Domes, eruptive vents and lava craters greatly outnumber pyroclastic cones. Most commonly, lava flows start from lava domes or craters. Small domes are often aligned along their feeding fissures. Lava domes and pyroclastic cones of the Andahua Group are aligned mainly along N–S and WNW–ESE trending fault systems. Projection points of the analysed Andahua lavas on the TAS diagram concentrate in the lower part of the trachyandesite field, entering also the basaltic trachyandesite or trachyte/trachydacite fields.
Źródło:
Annales Societatis Geologorum Poloniae; 2011, 81, No 1; 1-19
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fault network in Rio Colca valley between Maca and Pinchollo, Central Andes, southern Peru
Autorzy:
Żaba, J.
Małolepszy, Z.
Gaidzik, K.
Ciesielczuk, J.
Paulo, A.
Powiązania:
https://bibliotekanauki.pl/articles/191912.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
tectonics
structural geology
fault activity
Rio Colca Valley
Andes
southern Peru
Opis:
The network of faults and joints within the Mesozoic, Miocene and Pleistocene–Holocene formations was studied in the Rio Colca valley, in the Pinchollo–Lari–Maca area (Central Andes, southern Peru). A complex, multi-phase development of these structures was revealed. The results show that the structural framework of the Rio Colca valley consists of WNW–ESE and NE–SW faults, and a few W–E faults. The strike of the most common fault sets is approximately parallel (longitudinal) or perpendicular (transverse) to the W–E oriented strike of stratification surfaces in the Mesozoic sedimentary series and the W–E fold macro-structures, developed in these strata. Diagonal faults and joints are less common, although at some localities they are numerous. The recurrence of major fault systems throughout the Mesozoic and Miocene series and the Pleistocene–Holocene (mainly colluvial) deposits is proof of recent, tectonic activity in the study area. The recent faulting has led to the development of a system of distinct, primary fault scarps, tectonic grabens and horsts, as well as open fissures, which are well marked in the surface morphology, and in many cases have not yet been eroded.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 3; 279--290
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Homage to Ignacy Domeyko at the 200th anniversary of his birth
Autorzy:
Narębski, W.
Wójcik, Z.
Powiązania:
https://bibliotekanauki.pl/articles/191530.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Domeyko
Philomat
Polska
Lithuania
Belorussia
France
Chile
geosciences
ores
Andes
chemical mineralogy
Opis:
Ignacy Domeyko was born on July 31, 1802 in Niedźwiadka, Novogrodek district. After attending the Piarist College in Szczuczyn he studied at the Vilna University and got the M. Sc. degree in 1822. As member of the illegal Philomat Society was interned till 1829. In 1831 as participant of anti-Russian insurrection had to escape to Prussia, from where moved to Saxony and France. In the years 1832-1838 Domeyko was studying exact and geosciences at Sorbonne and École des Mines. Invited by the Government of Chile was teaching physico-chemical and geo-sciences in the Coquimbo College in La Serena in the years 1838-1846, carrying out large-scale geological and ethnographic field studies as well as chemical-mineralogical investigations. In the years 1846-1884 Domeyko was very active as academic teacher and in the period 1867-1883 as rector of the Chile University in Santiago, continuing research works and reforming local education system. His many-sided activity contributed significantly to economic and educational progress of Chile. In the final stage of his life (1884-1888) Domeyko, as already world-wide known scientist, could visit his homeland and other European countries, as well as Holy Land, but on the way back felt ill and on January 23, 1889 died in Santiago admired and venerated by Chileans as their apostle of science and education. The present paper deals with essential Domeyko's achievements in geosciences. Already during his stay in Paris the results of his observations on sinking of the area of East Prussia in historic times were published and Domeyko has prepared the geographic atlas of the territory of the native Polish-Lithuanian Commonwealth but only its part could be printed. In Chile, apart from didactic activity, accented by edition of handbooks on mineralogy and assaying, Domeyko was carrying out large-scale geological, mining and mineralogical investigations of Andes showing predilection to chemical analyses of collected materials. As follows from the inspection of archival materials, he is the author of at least 160 analyses of various, often chemically very complicated, minerals (including meteorites) and about 60 analyses of waters. This resulted in the discovery of several new minerals which were announced in renowned European periodicals. One of them - copper arsenide - was named by W. Haidinger domeykite. Besides, several Andean fossils sent by Domeyko to France were by A. d'Orbigny and other French palaeontolo- gists named after their discoverer. Following several minor papers on regional geology, including detailed studies of volcanic phenomena, he published in 1878 in Polish a monograph on Chilean Cordilleras and ore deposits, comparing some their fragments with similar horizons in the Polish Carpathians. These and other problems treated by Domeyko in numerous publications are discussed in the present paper. Domeyko's achievements were highly appreciated by several European and American scientific societies and universities by conferring him memberships and honorary doctorates. Moreover, due to his exceptional personality and spirituality, expressed in deeply Christian virtues realized in private and social life, Domeyko is a candidate for beatification. Geoscientists of Poland, Lithuania, Chile, Belorussia, France and other countries are celebrating 200th anniversary of his birth, paying homage to this eminent citizen of the world.
Źródło:
Annales Societatis Geologorum Poloniae; 2003, 73, No 1; 1-26
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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