Structure and evolution of hydrothermal vent complexes
Abstract: The Karoo large igneous province, formed at c. 183 Ma, is characterized by the presence of voluminous basaltic intrusive complexes within the Karoo Basin, extrusive lava sequences and hydrothermal vent complexes. These last are pipe-like structures, up to several hundred metres in diameter...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.580.6954 2023-05-15T17:33:59+02:00 Structure and evolution of hydrothermal vent complexes Henrik Svensen Bjørn Jamtveit Sverre Planke Luc Chevallier The Pennsylvania State University CiteSeerX Archives 2006 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.580.6954 http://folk.uio.no/hensven/Svensen_etal_GSL_06.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.580.6954 http://folk.uio.no/hensven/Svensen_etal_GSL_06.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://folk.uio.no/hensven/Svensen_etal_GSL_06.pdf text 2006 ftciteseerx 2016-01-08T13:00:44Z Abstract: The Karoo large igneous province, formed at c. 183 Ma, is characterized by the presence of voluminous basaltic intrusive complexes within the Karoo Basin, extrusive lava sequences and hydrothermal vent complexes. These last are pipe-like structures, up to several hundred metres in diameter, piercing the horizontally stratified sediments of the basin. Detailed mapping of two sediment-dominated hydrothermal vent complexes shows that they are composed of sediment breccias and sandstone. The breccias cut and intrude tilted host rocks, and are composed of mudstone and sandstone fragments with rare dolerite boulders. Sandstone clasts in the breccias are locally cemented by zeolite, which represents the only hydrothermal mineral in the vent complexes. Our data document that the hydrothermal vent complexes were formed by one or a few phreatic events, leading to the collapse of the surrounding sedimentary strata. We propose a model in which hydrothermal vent complexes originate in contact metamorphic aureoles around sill intrusions. Heating and expansion of host rock pore fluids resulted in rapid pore pressure build-up and phreatic eruptions. The hydrothermal vent complexes represent conduits for gases and fluids produced in contact metamorphic aureoles, slightly predating the onset of the main phase of flood volcanism. Large igneous provinces, such as the North Atlantic and the Karoo–Lesotho provinces, are characterized by the presence of an extensive network of sills and dykes emplaced in sedimentary Text North Atlantic Unknown |
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ftciteseerx |
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English |
description |
Abstract: The Karoo large igneous province, formed at c. 183 Ma, is characterized by the presence of voluminous basaltic intrusive complexes within the Karoo Basin, extrusive lava sequences and hydrothermal vent complexes. These last are pipe-like structures, up to several hundred metres in diameter, piercing the horizontally stratified sediments of the basin. Detailed mapping of two sediment-dominated hydrothermal vent complexes shows that they are composed of sediment breccias and sandstone. The breccias cut and intrude tilted host rocks, and are composed of mudstone and sandstone fragments with rare dolerite boulders. Sandstone clasts in the breccias are locally cemented by zeolite, which represents the only hydrothermal mineral in the vent complexes. Our data document that the hydrothermal vent complexes were formed by one or a few phreatic events, leading to the collapse of the surrounding sedimentary strata. We propose a model in which hydrothermal vent complexes originate in contact metamorphic aureoles around sill intrusions. Heating and expansion of host rock pore fluids resulted in rapid pore pressure build-up and phreatic eruptions. The hydrothermal vent complexes represent conduits for gases and fluids produced in contact metamorphic aureoles, slightly predating the onset of the main phase of flood volcanism. Large igneous provinces, such as the North Atlantic and the Karoo–Lesotho provinces, are characterized by the presence of an extensive network of sills and dykes emplaced in sedimentary |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Henrik Svensen Bjørn Jamtveit Sverre Planke Luc Chevallier |
spellingShingle |
Henrik Svensen Bjørn Jamtveit Sverre Planke Luc Chevallier Structure and evolution of hydrothermal vent complexes |
author_facet |
Henrik Svensen Bjørn Jamtveit Sverre Planke Luc Chevallier |
author_sort |
Henrik Svensen |
title |
Structure and evolution of hydrothermal vent complexes |
title_short |
Structure and evolution of hydrothermal vent complexes |
title_full |
Structure and evolution of hydrothermal vent complexes |
title_fullStr |
Structure and evolution of hydrothermal vent complexes |
title_full_unstemmed |
Structure and evolution of hydrothermal vent complexes |
title_sort |
structure and evolution of hydrothermal vent complexes |
publishDate |
2006 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.580.6954 http://folk.uio.no/hensven/Svensen_etal_GSL_06.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
http://folk.uio.no/hensven/Svensen_etal_GSL_06.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.580.6954 http://folk.uio.no/hensven/Svensen_etal_GSL_06.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766132665697697792 |