Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine
Open-system processes have a large capacity to modify magma compositions during differentiation. Obtaining the rates of such processes is essential to understanding and constraining the evolution of magmatic systems. Here we quantify the time scales for magmatic assimilation of hydrous mafic to ultr...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2012
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| Online Access: | https://hdl.handle.net/10356/95062 http://hdl.handle.net/10220/8720 |
| _version_ | 1826128641439825920 |
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| author | Costa, Fidel Dungan, Michael |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Costa, Fidel Dungan, Michael |
| author_sort | Costa, Fidel |
| collection | NTU |
| description | Open-system processes have a large capacity to modify magma compositions during differentiation. Obtaining the rates of such processes is essential to understanding and constraining the evolution of magmatic systems. Here we quantify the time scales for magmatic assimilation of hydrous mafic to ultramafic cumulates by ascending basalts using the zoning patterns of olivine xenocrysts. Robust diffusion modeling results have been obtained by treating multiple compositional profiles for multiple elements (Fe-Mg, Ni, Mn, Ca) on multiple crystals from multiple flows. We find that the time between assimilation and eruption ranges from a few months to ∼25 yr, although 80% of the results are <10 yr. These ranges are shorter than either magma transport times from the mantle to the surface or typical repose periods of arc volcanoes. Thus, modification of the geochemical and mineralogical features of basalts by assimilation of plutonic rocks is a fast and probably unavoidable magmatic process. |
| first_indexed | 2024-10-01T07:28:15Z |
| format | Journal Article |
| id | ntu-10356/95062 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:28:15Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | ntu-10356/950622020-03-07T12:37:19Z Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine Costa, Fidel Dungan, Michael School of Physical and Mathematical Sciences DRNTU::Science::Geology Open-system processes have a large capacity to modify magma compositions during differentiation. Obtaining the rates of such processes is essential to understanding and constraining the evolution of magmatic systems. Here we quantify the time scales for magmatic assimilation of hydrous mafic to ultramafic cumulates by ascending basalts using the zoning patterns of olivine xenocrysts. Robust diffusion modeling results have been obtained by treating multiple compositional profiles for multiple elements (Fe-Mg, Ni, Mn, Ca) on multiple crystals from multiple flows. We find that the time between assimilation and eruption ranges from a few months to ∼25 yr, although 80% of the results are <10 yr. These ranges are shorter than either magma transport times from the mantle to the surface or typical repose periods of arc volcanoes. Thus, modification of the geochemical and mineralogical features of basalts by assimilation of plutonic rocks is a fast and probably unavoidable magmatic process. 2012-10-08T06:08:19Z 2019-12-06T19:07:32Z 2012-10-08T06:08:19Z 2019-12-06T19:07:32Z 2005 2005 Journal Article Costa, F., & Dungan, M. (2005) Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine. Geology, 33(10), 837-840. 0091-7613 https://hdl.handle.net/10356/95062 http://hdl.handle.net/10220/8720 10.1130/G21675.1 en Geology © 2005 Geological Society of America. |
| spellingShingle | DRNTU::Science::Geology Costa, Fidel Dungan, Michael Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| title | Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| title_full | Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| title_fullStr | Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| title_full_unstemmed | Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| title_short | Short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| title_sort | short time scales of magmatic assimilation from diffusion modeling of multiple elements in olivine |
| topic | DRNTU::Science::Geology |
| url | https://hdl.handle.net/10356/95062 http://hdl.handle.net/10220/8720 |
| work_keys_str_mv | AT costafidel shorttimescalesofmagmaticassimilationfromdiffusionmodelingofmultipleelementsinolivine AT dunganmichael shorttimescalesofmagmaticassimilationfromdiffusionmodelingofmultipleelementsinolivine |