Wszystkie pola: Rocky Mountains - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Site locations and characteristics of miniature patterned ground, eastern Glacier National Park, Montana, U.S.A.
Autorzy:: Butler, D. R.
Malanson, G. P.
Powiązania:: https://bibliotekanauki.pl/articles/294314.pdf
Data publikacji:: 1999
Wydawca:: Stowarzyszenie Geomorfologów Polskich
Tematy:: patterned ground
solifluction
periglacial
Rocky Mountains
Montana
scale dependence
Opis:: We examined a total of 68 sites with miniature polygonal patterned ground above treeline, along and east of the Continental Divide in Glacier National Park, Montana, USA. Patterned ground develops at three geographic site-types: convex uplands; concave mountain passes and cols; and valleyside slopes. Data were collected at each site to characterize the patterned ground morphometry. Morphometry was similar regardless of site-type, and occurrence was dependent on the presence of fine-grained material on older solifluction terraces or sorted nets.
Źródło:: Landform Analysis; 1999, 2; 45-49
1429-799X
Pojawia się w:: Landform Analysis
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Fenomen kambryjskich łupków z Burgess w Górach Skalistych (Kanada) : przegląd fauny, środowiska sedymentacji i zjawisk tafonomicznych
The Cambrian Burgess Shale phenomenon of the Rocky Mountains (Canada) : an overview of the fauna, sedimentary and taphonomic conditions
Autorzy:: Śliwiński, M. G.
Żylińska, A.
Powiązania:: https://bibliotekanauki.pl/articles/2075033.pdf
Data publikacji:: 2013
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Cambrian
Burgess Shale
Rocky Mountains
Lagerstätten
redox
kambr
łupki z Burgess
Góry Skaliste
natlenienie wód
Opis:: The Burgess Shale of the Canadian Rocky Mts is one of the most well-known occurrences of Cambrian strata exhibiting exceptional preservation of a soft-bodied fauna. While Lagerstätten of the Burgess Shale-type fauna have been recognized in almost all parts of the world and in all Cambrian series, the circumstances and mechanisms allowing for such a unique mode of preservation have remained enigmatic. Of particular debate has been the reconstruction of prevailing redox conditions. This brief contribution overviews the fauna and recent advances towards understanding the sedimentary and taphonomic conditions prevailing during deposition.
Źródło:: Przegląd Geologiczny; 2013, 61, 12; 746--754
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Porównanie podatności magnetycznej (MS) i wskaźników geochemicznych środkowego i górnego franu w Kanadyjskich Górach Skalistych: implikacje dla analiz paleoklimatycznych i paleośrodowiskowych oraz interpretacji zdarzenia punctata
Comparison of magnetic susceptibility (MS) and other geochemical proxies from the Middle-Late Frasnian of the Canadian Rocky Mountains: implication for paleoenvironmental and paleoclimatic analyses and interpretations of the punctata Event
Autorzy:: Śliwiński, M. G.
Whalen, M.
Day, J.
Powiązania:: https://bibliotekanauki.pl/articles/2074752.pdf
Data publikacji:: 2010
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: późny dewon
podatność magnetyczna
zdarzenie punctata
pierwiastki śladowe
wycieczka geochemiczna
izotopy trwałe
zbiorniki osadowe Kanady zachodniej
Late Devonian
magnetic susceptibility
punctata Event
trace elements
stable isotopes
Western Canada Sedimentary Basin
Opis:: Ongoing magnetostratigraphic and geochemical studies (including major and trace element geochemistry and stable isotopes of C, N, O) in the Canadian Rocky Mountains are providing insight into the paleoenvironmental changes of the mid-Frasnian punctata Event, a prominent marine geochemical perturbation. The data is evaluated with 1) a regional sequence stratigraphic perspective and 2) within the context of a rapidly changing Late Devonian world, characterized by numerous sedimentological and faunal perturbations leading up to the eventual Frasnian-Fammenian (F/F) mass extinction. Proxies for bottom water paleoredox conditions (Mo, V, U), oceanic primary productivity (δ13Corg, δ15Nbulku, Cu, Ni, Ba), changes in detrital input (Si, Al, K, Ti, Zr), and magnetic susceptibility display similar trends, indicating that these proxies and MS variations are inherently linked. The observed excursions suggest that changes in detrital input were the main driver of a bioproductivity increase. Elevated organic matter export from the photic zone likely led to the deposition and later preservation of organic-carbon rich facies under facilitated conditions of bottom water suboxia-anoxia. These geochemical trends were likely influenced by eustatic sea level change, but may have been enhanced by pulses of coincident orogenic activity and pulses of terrestrial afforestation. The rise and expansion of the first true forests is thought to have drastically altered nutrient fluxes to the oceans via increases in pedogenesis and the expansion of a mature soil profile. Our work is intended to complement the growing body of research aimed at elucidating the causes and understanding the effects of terrestrial and marine events of the P. punctata biozone and, more broadly, at understanding the Earth-system changes of the Late Devonian leading up to the F/F boundary.
Źródło:: Przegląd Geologiczny; 2010, 58, 12; 1152-1160
0033-2151
Pojawia się w:: Przegląd Geologiczny
Dostawca treści:: Biblioteka Nauki

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