NEW INSIGHTS INTO THE RE-OS SYSTEMATICS OF SUB-CONTINENTAL LITHOSPHERIC MANTLE FROM IN SITU ANALYSIS OF SULPHIDES
- DSpace Home
- →
- Геология России
- →
- ELibrary
- →
- View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.
dc.contributor.author | Alard O. | |
dc.contributor.author | Griffin W.L. | |
dc.contributor.author | Pearson N.J. | |
dc.contributor.author | Lorand J.P. | |
dc.contributor.author | O'Reilly S.Y. | |
dc.date.accessioned | 2021-09-17T06:49:05Z | |
dc.date.available | 2021-09-17T06:49:05Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=1255122 | |
dc.identifier.citation | Earth and Planetary Science Letters, 2002, 203, 2, 651-663 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30274 | |
dc.description.abstract | The Os isotopic compositions of mantle rocks generally are considered to be established during melt-depletion events and to be robust to subsequent disturbances (e.g. metasomatism). Consequently, Os isotopes are used to date the main melting event that a mantle section has undergone, i.e. transformation of fertile asthenospheric material into a depleted, buoyant lithosphere. However, Os resides almost entirely in Fe-Ni-Cu sulphides, which can be very mobile under mantle conditions. In situ laser ablation multi-collector ICP-MS measurement of Re/Os isotopic ratios in sulphides from spinel peridotite xenoliths demonstrates that whole-rock Os-isotope signatures record the mixing of multiple sulphide populations. Sulphides residual after melting events have unradiogenic Os isotopic compositions reflecting ancient melt depletion; those introduced by later metasomatism events contain more radiogenic Os. Therefore, the whole-rock Os isotopic signature can be strongly altered by metasomatic processes, and studies of mantle-derived xenoliths show that such disturbance is quite common in the lithospheric mantle. Because melt-depletion ages estimated from individual sulphide inclusions are systematically older than those obtained from whole-rock analysis, caution is essential in the interpretation of the Os model ages derived from whole-rock analysis, and their use and abuse in geodynamic models. This work suggests that sulphide could become a key phase in unravelling the formation and evolution of the lithosphere. | |
dc.subject | RE/OS | |
dc.subject | SIDEROPHILE ELEMENTS | |
dc.subject | SULFIDES | |
dc.subject | MANTLE | |
dc.subject | METASOMATISM | |
dc.subject | IN SITU | |
dc.title | NEW INSIGHTS INTO THE RE-OS SYSTEMATICS OF SUB-CONTINENTAL LITHOSPHERIC MANTLE FROM IN SITU ANALYSIS OF SULPHIDES | |
dc.type | Статья |
Files in this item
This item appears in the following Collection(s)
-
ELibrary
Метаданные публикаций с сайта https://www.elibrary.ru