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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ftunivtasecite:oai:ecite.utas.edu.au:24736 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 https://doi.org/10.1016/S0009-2541(01)00383-7 http://ecite.utas.edu.au/24736 en eng Elsevier http://dx.doi.org/10.1016/S0009-2541(01)00383-7 Kamenetsky, VS and Davidson, P and Mernagh, TP and Crawford, AJ and Gemmell, JB and Portnyagin, MV and Shinjo, R, Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids?, Chemical Geology, 183, (3-4) pp. 349-364. ISSN 0009-2541 (2002) [Refereed Article] http://ecite.utas.edu.au/24736 Earth Sciences Geology Igneous and Metamorphic Petrology Refereed Article PeerReviewed 2002 ftunivtasecite https://doi.org/10.1016/S0009-2541(01)00383-7 2019-12-13T21:06:00Z 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 43N 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 CO 2-( H 2O 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. 2002 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Macquarie Island eCite UTAS (University of Tasmania) Hunter Ridge ENVELOPE(-124.820,-124.820,58.400,58.400) Mid-Atlantic Ridge Pacific Chemical Geology 183 1-4 349 364 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Igneous and Metamorphic Petrology |
spellingShingle |
Earth Sciences Geology Igneous and Metamorphic Petrology 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 |
Earth Sciences Geology Igneous and Metamorphic Petrology |
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 43N 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 CO 2-( H 2O 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. 2002 Elsevier Science B.V. All rights reserved. |
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? |
publisher |
Elsevier |
publishDate |
2002 |
url |
https://doi.org/10.1016/S0009-2541(01)00383-7 http://ecite.utas.edu.au/24736 |
long_lat |
ENVELOPE(-124.820,-124.820,58.400,58.400) |
geographic |
Hunter Ridge Mid-Atlantic Ridge Pacific |
geographic_facet |
Hunter Ridge Mid-Atlantic Ridge Pacific |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_relation |
http://dx.doi.org/10.1016/S0009-2541(01)00383-7 Kamenetsky, VS and Davidson, P and Mernagh, TP and Crawford, AJ and Gemmell, JB and Portnyagin, MV and Shinjo, R, Fluid bubbles in melt inclusions and pillow-rim glasses: high-temperature precursors to hydrothermal fluids?, Chemical Geology, 183, (3-4) pp. 349-364. ISSN 0009-2541 (2002) [Refereed Article] http://ecite.utas.edu.au/24736 |
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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1766066361387188224 |