Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars
Silica- and sulfate-rich deposits observed by Mars Exploration Rover (MER) Spirit near Home Plate, Gusev crater, Mars, indicate alteration of Mars basalt by a diverse array of hydrothermal fluids and processes. Constraining the precise fluid conditions present at the time of deposition for these dep...
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ftunivwisconmil:oai:dc.uwm.edu:etd-3558 2023-07-02T03:32:42+02:00 Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars Ludyan, Jordan 2020-12-01T08:00:00Z application/pdf https://dc.uwm.edu/etd/2553 https://dc.uwm.edu/context/etd/article/3558/viewcontent/Ludyan_uwm_0263M_12919.pdf unknown UWM Digital Commons https://dc.uwm.edu/etd/2553 https://dc.uwm.edu/context/etd/article/3558/viewcontent/Ludyan_uwm_0263M_12919.pdf Theses and Dissertations Geochemistry Geology Geothermal Hydrothermal Iceland Mars text 2020 ftunivwisconmil 2023-06-13T18:31:49Z Silica- and sulfate-rich deposits observed by Mars Exploration Rover (MER) Spirit near Home Plate, Gusev crater, Mars, indicate alteration of Mars basalt by a diverse array of hydrothermal fluids and processes. Constraining the precise fluid conditions present at the time of deposition for these deposits on Mars relies on investigations of terrestrial hydrothermal systems that produce similar mineral assemblages. Alteration products and fluids collected from the Ölkelduháls, Nesjavellir, and Geysir hydrothermal areas in southern Iceland cover a wide range of end-member and intermediate fluid and alteration environments, and provide a means to compare the secondary minerals produced from different hydrothermal processes. Altered sediments, precipitates, and thermal fluids were collected from hot springs with pH ranging from 2.15 – 8.70 and one active fumarole and analyzed for their geochemical and mineral composition. Pyrite was abundant throughout all three field sites indicating highly reducing conditions up to very shallow depths. Phyllosilicates were dominated by smectite and kaolinite, and smectite was associated with both acidic and alkaline hot springs, demonstrating that its formation may not be impeded by acidic conditions. Patterns of enrichment in leached rocks indicate that TiO2 and Zr follow a nearly linear trend of residual accumulation in rocks subjected to acidic fluids, consistent with their low solubility. This relationship was used to assess the behavior of trace elements in altered solids. Vanadium and Cr were found to be most resistant to acid leaching, with other elements likely incorporated into secondary minerals that could lead to depletion or enrichment depending on the mineral assemblage. In surface waters, Mg, Fe, Al, Ca, Mn, Cr, Ni, Ti, V, and Zr were found to be mobile only at very low pH, with a downward exponential trend at pH > 3. Chloride, K, Na, Ge, B, As, and Rb displayed the opposite trend and were scavenged from rocks at depth and incorporated into neutral to alkaline hot ... Text Iceland University of Wisconsin-Milwaukee: UWM Digital Commons Geysir ENVELOPE(-20.277,-20.277,64.307,64.307) Nesjavellir ENVELOPE(-21.251,-21.251,64.115,64.115) Gusev ENVELOPE(43.341,43.341,66.102,66.102) |
institution |
Open Polar |
collection |
University of Wisconsin-Milwaukee: UWM Digital Commons |
op_collection_id |
ftunivwisconmil |
language |
unknown |
topic |
Geochemistry Geology Geothermal Hydrothermal Iceland Mars |
spellingShingle |
Geochemistry Geology Geothermal Hydrothermal Iceland Mars Ludyan, Jordan Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars |
topic_facet |
Geochemistry Geology Geothermal Hydrothermal Iceland Mars |
description |
Silica- and sulfate-rich deposits observed by Mars Exploration Rover (MER) Spirit near Home Plate, Gusev crater, Mars, indicate alteration of Mars basalt by a diverse array of hydrothermal fluids and processes. Constraining the precise fluid conditions present at the time of deposition for these deposits on Mars relies on investigations of terrestrial hydrothermal systems that produce similar mineral assemblages. Alteration products and fluids collected from the Ölkelduháls, Nesjavellir, and Geysir hydrothermal areas in southern Iceland cover a wide range of end-member and intermediate fluid and alteration environments, and provide a means to compare the secondary minerals produced from different hydrothermal processes. Altered sediments, precipitates, and thermal fluids were collected from hot springs with pH ranging from 2.15 – 8.70 and one active fumarole and analyzed for their geochemical and mineral composition. Pyrite was abundant throughout all three field sites indicating highly reducing conditions up to very shallow depths. Phyllosilicates were dominated by smectite and kaolinite, and smectite was associated with both acidic and alkaline hot springs, demonstrating that its formation may not be impeded by acidic conditions. Patterns of enrichment in leached rocks indicate that TiO2 and Zr follow a nearly linear trend of residual accumulation in rocks subjected to acidic fluids, consistent with their low solubility. This relationship was used to assess the behavior of trace elements in altered solids. Vanadium and Cr were found to be most resistant to acid leaching, with other elements likely incorporated into secondary minerals that could lead to depletion or enrichment depending on the mineral assemblage. In surface waters, Mg, Fe, Al, Ca, Mn, Cr, Ni, Ti, V, and Zr were found to be mobile only at very low pH, with a downward exponential trend at pH > 3. Chloride, K, Na, Ge, B, As, and Rb displayed the opposite trend and were scavenged from rocks at depth and incorporated into neutral to alkaline hot ... |
format |
Text |
author |
Ludyan, Jordan |
author_facet |
Ludyan, Jordan |
author_sort |
Ludyan, Jordan |
title |
Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars |
title_short |
Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars |
title_full |
Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars |
title_fullStr |
Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars |
title_full_unstemmed |
Surface Alteration in the Ölkelduháls, Nesjavellir, and Geysir Hydrothermal Systems, Iceland: Implications for Mars |
title_sort |
surface alteration in the ölkelduháls, nesjavellir, and geysir hydrothermal systems, iceland: implications for mars |
publisher |
UWM Digital Commons |
publishDate |
2020 |
url |
https://dc.uwm.edu/etd/2553 https://dc.uwm.edu/context/etd/article/3558/viewcontent/Ludyan_uwm_0263M_12919.pdf |
long_lat |
ENVELOPE(-20.277,-20.277,64.307,64.307) ENVELOPE(-21.251,-21.251,64.115,64.115) ENVELOPE(43.341,43.341,66.102,66.102) |
geographic |
Geysir Nesjavellir Gusev |
geographic_facet |
Geysir Nesjavellir Gusev |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Theses and Dissertations |
op_relation |
https://dc.uwm.edu/etd/2553 https://dc.uwm.edu/context/etd/article/3558/viewcontent/Ludyan_uwm_0263M_12919.pdf |
_version_ |
1770272352751321088 |