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

• Autorzy: Śliwiński M. G. , Whalen M. , Day J.

Warianty tytułu

EN

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

• Języki publikacji: PL

Abstrakty

EN

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 (δ¹³C_org, δ¹⁵N_bulku, 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.

Słowa kluczowe

PL

późny dewon; podatność magnetyczna; zdarzenie punctata; pierwiastki śladowe; wycieczka geochemiczna; izotopy trwałe; zbiorniki osadowe Kanady zachodniej

EN

Late Devonian; magnetic susceptibility; punctata Event; trace elements; stable isotopes; Western Canada Sedimentary Basin

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Przegląd Geologiczny
• Rocznik: 2010
• Tom: Vol. 58, nr 12
• Strony: 1152--1160
• Opis fizyczny: Bibliogr. 44 poz., rys., wykr.

Twórcy

autor

Śliwiński M. G.

autor

Whalen M.

autor

Day J.

• Department of Geology and Geophysics, University of Alaska Fairbanks, Fairbanks, AK, 99775, USA,

Bibliografia

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