Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses)
Magnesian basaltic glasses from the Miocene Macquarie Island ophiolite (SW Pacific) are used for understanding the effects of progressive partial melting of the mantle peridotite, and subsequent magma crystallisation and degassing on the composition of mid-ocean ridge basalts. These glasses are repr...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Elsevier
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1885/68070 |
id |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/68070 |
---|---|
record_format |
openpolar |
spelling |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/68070 2023-05-15T17:09:54+02:00 Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) Kamenetsky, Vadim S Eggins, Stephen 2015-12-10T23:27:06Z http://hdl.handle.net/1885/68070 unknown Elsevier 0009-2541 http://hdl.handle.net/1885/68070 Chemical Geology Journal article 2015 ftanucanberra 2015-12-28T23:34:03Z Magnesian basaltic glasses from the Miocene Macquarie Island ophiolite (SW Pacific) are used for understanding the effects of progressive partial melting of the mantle peridotite, and subsequent magma crystallisation and degassing on the composition of mid-ocean ridge basalts. These glasses are represented by two suites, near-primitive (Group I) and fractionated (Group II), which show clear parent-daughter relationships. Their exceptional compositional diversity in major, trace lithophile and volatile elements is shared by a set of metallic elements and metalloids, analysed in this study by laser ablation ICPMS. The Group-I glasses provide concentrations of compatible metals before they are severely modified by crystal fractionation (e.g., V, Sc, Co, Ni, Cr, Zn) or melt degassing (Cu). The constant or nearly constant ratios of the elements in the Macquarie Island primitive and fractionated melts are used for identification of similar bulk distribution coefficients during melting and crystal fractionation, respectively. The estimated relative degree of incompatibility during mantle melting provides constraints on the siderophile, chalcophile and volatile element abundances in the model "primitive" and "depleted" mantle sources. The chemical systematics observed in the studied glasses can be further used to explore mantle source compositions, including mineral phases involved in magma generation, and processes controlling fractionation of chemical elements in both mantle source and mantle-derived melts. Article in Journal/Newspaper Macquarie Island Australian National University: ANU Digital Collections Pacific |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
Magnesian basaltic glasses from the Miocene Macquarie Island ophiolite (SW Pacific) are used for understanding the effects of progressive partial melting of the mantle peridotite, and subsequent magma crystallisation and degassing on the composition of mid-ocean ridge basalts. These glasses are represented by two suites, near-primitive (Group I) and fractionated (Group II), which show clear parent-daughter relationships. Their exceptional compositional diversity in major, trace lithophile and volatile elements is shared by a set of metallic elements and metalloids, analysed in this study by laser ablation ICPMS. The Group-I glasses provide concentrations of compatible metals before they are severely modified by crystal fractionation (e.g., V, Sc, Co, Ni, Cr, Zn) or melt degassing (Cu). The constant or nearly constant ratios of the elements in the Macquarie Island primitive and fractionated melts are used for identification of similar bulk distribution coefficients during melting and crystal fractionation, respectively. The estimated relative degree of incompatibility during mantle melting provides constraints on the siderophile, chalcophile and volatile element abundances in the model "primitive" and "depleted" mantle sources. The chemical systematics observed in the studied glasses can be further used to explore mantle source compositions, including mineral phases involved in magma generation, and processes controlling fractionation of chemical elements in both mantle source and mantle-derived melts. |
format |
Article in Journal/Newspaper |
author |
Kamenetsky, Vadim S Eggins, Stephen |
spellingShingle |
Kamenetsky, Vadim S Eggins, Stephen Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) |
author_facet |
Kamenetsky, Vadim S Eggins, Stephen |
author_sort |
Kamenetsky, Vadim S |
title |
Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) |
title_short |
Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) |
title_full |
Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) |
title_fullStr |
Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) |
title_full_unstemmed |
Systematics of metals, metalloids, and volatiles in MORB melts: Effects of partial melting, crystal fractionation and degassing (a case study of Macquarie Island glasses) |
title_sort |
systematics of metals, metalloids, and volatiles in morb melts: effects of partial melting, crystal fractionation and degassing (a case study of macquarie island glasses) |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/68070 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_source |
Chemical Geology |
op_relation |
0009-2541 http://hdl.handle.net/1885/68070 |
_version_ |
1766066273153712128 |