Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids?
Hypotheses for the formation of many types of hydrothermal ore deposits often involve the direct contribution of magma-related fluids (e.g., Cu-Mo-Au porphyries) or their superimposition on barren hydrothermal cells (e.g., volcanic-hosted massive sulfide deposits). However, the chemical and phase co...
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2002
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Online Access: | https://eprints.utas.edu.au/329/ https://eprints.utas.edu.au/329/1/CG-bubbles.pdf https://doi.org/10.1016/S0009-2541(01)00383-7 |
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ftunivtasmania:oai:eprints.utas.edu.au:329 2023-05-15T17:09:59+02:00 Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? Kamenetsky, VS Davidson, P Mernagh, TP Crawford, AJ Gemmell, JB Portnyagin, MV Shinjo, R 2002-03 application/pdf https://eprints.utas.edu.au/329/ https://eprints.utas.edu.au/329/1/CG-bubbles.pdf https://doi.org/10.1016/S0009-2541(01)00383-7 en eng https://eprints.utas.edu.au/329/1/CG-bubbles.pdf Kamenetsky, VS, Davidson, P, Mernagh, TP, Crawford, AJ, Gemmell, JB, Portnyagin, MV and Shinjo, R 2002 , 'Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids?' , Chemical Geology, vol. 183, no. 1-4 , pp. 349-364 , doi:10.1016/S0009-2541(01)00383-7 <http://dx.doi.org/10.1016/S0009-2541(01)00383-7>. cc_utas 260100 Geology fluid bubbles melt inclusion pillow-rim glass high-temperature precursor hydrothermal fluid subduction zones volcanic-rocks ridge basalt magma co2 sulfur vesicles Article PeerReviewed 2002 ftunivtasmania https://doi.org/10.1016/S0009-2541(01)00383-7 2020-05-30T07:14:04Z Hypotheses for the formation of many types of hydrothermal ore deposits often involve the direct contribution of magma-related fluids (e.g., Cu-Mo-Au porphyries) or their superimposition on barren hydrothermal cells (e.g., volcanic-hosted massive sulfide deposits). However, the chemical and phase compositions of such fluids remain largely unknown. We report preliminary results of a comprehensive study of fluid bubbles trapped inside glassy melt inclusions in primitive olivine phenocrysts and pillow-rim glasses from basaltic magmas from different tectonic environments, including mid-ocean ridges (Macquarie Island, SW Pacific and Mid-Atlantic Ridge 43°N Fracture Zone), ocean islands (Hawaii) and a variety of modern and ancient backarc-island arc settings (eastern Manus Basin, Okinawa and Vanuatu Troughs, Troodos, New Caledonia and Hunter Ridge-Hunter Fracture Zone). Fluid bubbles from all localities, studied using electron microscopy with EDS and laser Raman spectroscopy, are composed of CO2-(± H2O ± sulfur)-bearing vapor and contain significant amounts of amorphous (Na-K-Ca-Fe alumino-silicates and dissorded carbon) and crystalline phases. The crystals are represented mainly by carbonates (magnesite, calcite, ankerite, dolomite, siderite, nahcolite and rhodochrosite), sulfates (anhydrite, gypsum, barite and anglesite), and sulfides (pyrite, arsenopyrite, chalcopyrite and marcasite), though other minerals (brukite, apatite, halite, clinoenstatite, kalsilite, nepheline, amphibole and mica) may occur as well. We argue that chemical components (e.g., C, H, S, Cl, Si, Al, Na, K, Fe, Mn, Cr, Ca, Mg, Ba, Pb and Cu) that later formed precipitates in fluid bubbles were originally dissolved in the magmatic fluid, and were not supplied by host glasses or phenocrysts after entrapment. Magma-related fluid rich in dissolved metals and other non-volatile elements may be a potential precursor to ore-forming solutions. Article in Journal/Newspaper Macquarie Island University of Tasmania: UTas ePrints Pacific Mid-Atlantic Ridge Hunter Ridge ENVELOPE(-124.820,-124.820,58.400,58.400) Chemical Geology 183 1-4 349 364 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
260100 Geology fluid bubbles melt inclusion pillow-rim glass high-temperature precursor hydrothermal fluid subduction zones volcanic-rocks ridge basalt magma co2 sulfur vesicles |
spellingShingle |
260100 Geology fluid bubbles melt inclusion pillow-rim glass high-temperature precursor hydrothermal fluid subduction zones volcanic-rocks ridge basalt magma co2 sulfur vesicles Kamenetsky, VS Davidson, P Mernagh, TP Crawford, AJ Gemmell, JB Portnyagin, MV Shinjo, R Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
topic_facet |
260100 Geology fluid bubbles melt inclusion pillow-rim glass high-temperature precursor hydrothermal fluid subduction zones volcanic-rocks ridge basalt magma co2 sulfur vesicles |
description |
Hypotheses for the formation of many types of hydrothermal ore deposits often involve the direct contribution of magma-related fluids (e.g., Cu-Mo-Au porphyries) or their superimposition on barren hydrothermal cells (e.g., volcanic-hosted massive sulfide deposits). However, the chemical and phase compositions of such fluids remain largely unknown. We report preliminary results of a comprehensive study of fluid bubbles trapped inside glassy melt inclusions in primitive olivine phenocrysts and pillow-rim glasses from basaltic magmas from different tectonic environments, including mid-ocean ridges (Macquarie Island, SW Pacific and Mid-Atlantic Ridge 43°N Fracture Zone), ocean islands (Hawaii) and a variety of modern and ancient backarc-island arc settings (eastern Manus Basin, Okinawa and Vanuatu Troughs, Troodos, New Caledonia and Hunter Ridge-Hunter Fracture Zone). Fluid bubbles from all localities, studied using electron microscopy with EDS and laser Raman spectroscopy, are composed of CO2-(± H2O ± sulfur)-bearing vapor and contain significant amounts of amorphous (Na-K-Ca-Fe alumino-silicates and dissorded carbon) and crystalline phases. The crystals are represented mainly by carbonates (magnesite, calcite, ankerite, dolomite, siderite, nahcolite and rhodochrosite), sulfates (anhydrite, gypsum, barite and anglesite), and sulfides (pyrite, arsenopyrite, chalcopyrite and marcasite), though other minerals (brukite, apatite, halite, clinoenstatite, kalsilite, nepheline, amphibole and mica) may occur as well. We argue that chemical components (e.g., C, H, S, Cl, Si, Al, Na, K, Fe, Mn, Cr, Ca, Mg, Ba, Pb and Cu) that later formed precipitates in fluid bubbles were originally dissolved in the magmatic fluid, and were not supplied by host glasses or phenocrysts after entrapment. Magma-related fluid rich in dissolved metals and other non-volatile elements may be a potential precursor to ore-forming solutions. |
format |
Article in Journal/Newspaper |
author |
Kamenetsky, VS Davidson, P Mernagh, TP Crawford, AJ Gemmell, JB Portnyagin, MV Shinjo, R |
author_facet |
Kamenetsky, VS Davidson, P Mernagh, TP Crawford, AJ Gemmell, JB Portnyagin, MV Shinjo, R |
author_sort |
Kamenetsky, VS |
title |
Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
title_short |
Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
title_full |
Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
title_fullStr |
Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
title_full_unstemmed |
Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
title_sort |
fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids? |
publishDate |
2002 |
url |
https://eprints.utas.edu.au/329/ https://eprints.utas.edu.au/329/1/CG-bubbles.pdf https://doi.org/10.1016/S0009-2541(01)00383-7 |
long_lat |
ENVELOPE(-124.820,-124.820,58.400,58.400) |
geographic |
Pacific Mid-Atlantic Ridge Hunter Ridge |
geographic_facet |
Pacific Mid-Atlantic Ridge Hunter Ridge |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
https://eprints.utas.edu.au/329/1/CG-bubbles.pdf Kamenetsky, VS, Davidson, P, Mernagh, TP, Crawford, AJ, Gemmell, JB, Portnyagin, MV and Shinjo, R 2002 , 'Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids?' , Chemical Geology, vol. 183, no. 1-4 , pp. 349-364 , doi:10.1016/S0009-2541(01)00383-7 <http://dx.doi.org/10.1016/S0009-2541(01)00383-7>. |
op_rights |
cc_utas |
op_doi |
https://doi.org/10.1016/S0009-2541(01)00383-7 |
container_title |
Chemical Geology |
container_volume |
183 |
container_issue |
1-4 |
container_start_page |
349 |
op_container_end_page |
364 |
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1766066364900966400 |