Wyniki wyszukiwania - BazTech

1

Constraints on the nature and evolution of the volcanic fields of the Andahua Group, Central Volcanic Zone, southern Peru

Gałaś Andrzej, Németh Károly, Lewińska Paulina

Geological Quarterly

|

2022

|

Vol. 66, No. 3

art. no. 25

EN

The Andahua Group is a distinct cluster of typically monogenetic volcanoes located in the northernmost part of the Central Volcanic Zone in the Andes, characterized by small-volume lava domes and scoria cones. Seven volcanic clusters have been distinguished. Using satellite imagery, geological mapping, and fieldwork, we found a total of 103 lava domes, 43 scoria cones, and 3 small composite volcanoes. Most of the lava domes are monogenetic but 9 were formed by multiple eruptions. Petrogenetic models have been developed for the magma evolution of the Andahua Group. They show local crustal influence on the magmas generated, and possible controls on the magma pathway to the surface, and potential segregation. Local compositional variation of the crustal rocks is inferred to have a strong influence on the magma that ascends through the thick continental crust. Assimilation and contamination by deeply seated granitoids of the Arequipa and Paracas massifs are also inferred to play a role in the final magmatic products. Future activity with gas emissions from the Andahua Group volcanoes may cause hazardous conditions for tourists.

2

Fault network in Rio Colca valley between Maca and Pinchollo, Central Andes, southern Peru

Żaba J., Małolepszy Z., Gaidzik K., Ciesielczuk J., Paulo A.

Annales Societatis Geologorum Poloniae

|

2012

|

Vol. 82, No. 3

279-–290

EN

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.

3

Flora mszaków i porostów Kanionu Colca (Peru) - badania rekonesansowe

Cykowska B., Flakus A.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

|

2008

|

T. 34, z. 2/1

193-203

PL

Artykuł jest pierwszym doniesieniem o długofalowym projekcie, mającym na celu poznanie różnorodności gatunkowej mszaków i porostów na obszarze projektowanego Parku Narodowego Kanion Colca i Dolina Wulkanów (Arequipa, Peru) oraz ich ekologii w kontekście zróżnicowania środowiska abiotycznego. Środowisko przyrodnicze tego najgłębszego kanionu świata nie doczekało się dotychczas kompleksowego opracowania flory mszaków i porostów. Już na podstawie wstępnych obserwacji stwierdzono ich znaczący udział w szacie roślinnej tego obszaru oraz potencjalnie duże bogactwo gatunkowe wynikające ze znacznego zróżnicowania siedlisk. Istotnym wynikiem rozpoczętych badań jest odkrycie pierwszych stanowisk porostów Lecanora leuckertiana w Ameryce Południowej i Lepraria impossibilis na Półkuli Południowej. Dalsze badania powinny zaowocować opracowaniem pełnej listy gatunków mszaków i porostów Parku Narodowego Kanion Colca i Dolina Wulkanów oraz dostarczyć argumentów do ochrony jego unikalnej przyrody.

EN

The paper is a preliminary report of a long-term project that aims at completing the flora of bryophytes and lichens in the projected Canyon Colca and the Valley of the Volcanoes National Park area (Arequipa, Peru). The bryophytes and lichens of this deepest canyon in the world has remained underexplored for a long time. These organisms dominate in the vegetation cover and exhibit a remarkable species diversity resulting from habitat richness in this area. The important result of preliminary studies was discovered the first records of lichens Lecanora leuckertiana in South America and Lepraria impossibilis in the Southern Hemisphere. Further researeh should result in completing floristic lists of bryophytes and lichens of the Canyon Colca and the Valley of the Volcanoes National Park and should provide arguments for the protection of its unique wild life.

4

Homage to Ignacy Domeyko at the 200th anniversary of his birth

Narębski W., Wójcik Z.

Annales Societatis Geologorum Poloniae

|

2003

|

Vol. 73, No 1

1-26

EN

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.