globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.06.035
论文题名:
The basalt pipes of the Tunguska Basin (Siberia, Russia): High temperature processes and volatile degassing into the end-Permian atmosphere
作者: Polozov A.G.; Svensen H.H.; Planke S.; Grishina S.N.; Fristad K.E.; Jerram D.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441
起始页码: 51
结束页码: 64
语种: 英语
英文关键词: Diatreme ; End-Permian crisis ; Flood basalts ; Large igneous province ; Magma-brine interaction ; Tunguska Basin
英文摘要: A number of mechanisms have been proposed to explain the end-Permian crisis. Many of them explore the link between this catastrophe and the Siberian Traps. We test the hypothesis that eruption of thermogenic gas generated in contact aureoles around igneous sills intruded into evaporite sequences of the Tunguska Basin triggered the crisis. In particular, we test the idea that the aspect that breccia pipes represent conduits for voluminous gas migration from the deep basins to the atmosphere. This contribution sheds new light on the pipe formation based on new field and borehole observations and electron microscopy analyses. Of more than three hundred mapped magnetite-bearing basalt pipes, 43 are classified as diatremes. The diatremes are usually circular or elliptical, with multiple zones of brecciation reaching the surface, sometimes with preserved in-filled crater lakes. The pipe diameter on the surface varies from a few tens of meters for small single diatremes to about a kilometer. The largest crater lake area is 2.7km2. We have conducted a detailed study of the breccias in the Sholokhovsk basalt pipe located within the Nepa potash deposit in the Tunguska Basin, Siberia, Russia (about N 59° and E 107°) and find that the breccias are cemented by carbonate matrix (calcite, dolomite) and halite. Breccia clasts are altered at various temperatures, evidenced by growth of albite and garnet from basaltic glass, and diopside, garnet, magnetite and chlorine-bearing amphibole (up to 1.8% Cl) in altered magmatic clasts. These mineral assemblages suggest high temperature interactions with evaporites within the pipe conduits. The large number of pipes support that degassing of halogen-rich volatiles was a widespread and violent process with implications for the end-Permian crisis. © 2015 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68636
Appears in Collections:过去全球变化的重建

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作者单位: Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences (IGEM RAS), Staromonetnyi side-str. 35, Moscow, Russian Federation; Centre for Earth Evolution and Dynamics (CEED), Postbox 1028, Blindern, Oslo, Norway; Volcanic Basin Petroleum Research AS (VBPR), Oslo, Norway; V.S. Sobolev Institute of Geology and Mineralogy of the Siberian Branch of the RAS (IGM SB RAS), Ac. Koptyuga ave. 3, Novosibirsk, Russian Federation; NASA Ames Research Center, Exobiology Branch, MS 239-4, Moffett Field, CA, United States; DougalEARTH LTD, Solihull, United Kingdom; Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, QLD, Australia

Recommended Citation:
Polozov A.G.,Svensen H.H.,Planke S.,et al. The basalt pipes of the Tunguska Basin (Siberia, Russia): High temperature processes and volatile degassing into the end-Permian atmosphere[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441
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