A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia)
Textural and chemical differences in coeval rhyolitic effusive and explosive eruptions are commonly observed, and numerical models predict different timescales for the eruption of crystal-rich mushes versus crystal-poor magmas. We compare quartz zonation and diffusion timescales of crystal-rich rhyo...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2018-07-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/article/10.3389/feart.2018.00095/full |
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| author | Susanne Seitz Benita Putlitz Lukas Baumgartner Anders Meibom Anders Meibom Stéphane Escrig Anne-Sophie Bouvier |
| author_facet | Susanne Seitz Benita Putlitz Lukas Baumgartner Anders Meibom Anders Meibom Stéphane Escrig Anne-Sophie Bouvier |
| author_sort | Susanne Seitz |
| collection | DOAJ |
| description | Textural and chemical differences in coeval rhyolitic effusive and explosive eruptions are commonly observed, and numerical models predict different timescales for the eruption of crystal-rich mushes versus crystal-poor magmas. We compare quartz zonation and diffusion timescales of crystal-rich rhyolitic ignimbrites and crystal-poor rhyolitic lava flows from the Jurassic Chon Aike Province exposed in Patagonia (Argentina). The timescales are assessed by using diffusion modeling based on nanoscale secondary ion mass spectrometry (NanoSIMS) analysis of titanium (Ti) concentration profiles in quartz crystals oriented by image analysis using micro-tomography. Quantitative Ti-data were acquired by SIMS to estimate crystallization temperatures. The textural and geochemical analysis revealed clear differences between crystal-poor rhyolitic lava flows and crystal-rich rhyolitic ignimbrites. Quartz crystals from rhyolitic lava flows display simple oscillatory cathodoluminescence (CL) zoning interpreted to be magmatic and diffusion chronometry suggest a short timescale for quartz crystallization from 5.6 ± 2.2 to 41.6 ± 9.8 years. Resorption textures are rare, and hence crystals in rhyolitic lava flows recorded a simple, rapid extraction, transport and eruption history for these crystal-poor melts. Rhyolitic ignimbrites, in contrast, reveal complex zoning patterns, reflecting several episodes of partial resorption and growth throughout their crystallization history. The complex quartz zoning textures together with longer diffusion times (<350 years), rather suggest a storage in a mush with fluctuating pressure and temperature conditions leading to intermittent resorption. Yet, a final quartz overgrowth rim occurred over a much shorter timescale in the order of years (<3 years). This implies, that crystal-rich mushes can be re-mobilized very fast, as fast as crystal-poor magmas. The use of in-situ methods with a high spatial resolution, like NanoSIMS, is critical to resolve very short magmatic timescales. |
| first_indexed | 2024-12-10T09:22:58Z |
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| id | doaj.art-48af7e826b8941d39619b56995eefade |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-10T09:22:58Z |
| publishDate | 2018-07-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj.art-48af7e826b8941d39619b56995eefade2022-12-22T01:54:38ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632018-07-01610.3389/feart.2018.00095336373A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia)Susanne Seitz0Benita Putlitz1Lukas Baumgartner2Anders Meibom3Anders Meibom4Stéphane Escrig5Anne-Sophie Bouvier6Institute of Earth Sciences, University of Lausanne, Lausanne, SwitzerlandInstitute of Earth Sciences, University of Lausanne, Lausanne, SwitzerlandInstitute of Earth Sciences, University of Lausanne, Lausanne, SwitzerlandInstitute of Earth Sciences, University of Lausanne, Lausanne, SwitzerlandLaboratory for Biological Geochemistry, Federal School of Technology Lausanne, Lausanne, SwitzerlandLaboratory for Biological Geochemistry, Federal School of Technology Lausanne, Lausanne, SwitzerlandInstitute of Earth Sciences, University of Lausanne, Lausanne, SwitzerlandTextural and chemical differences in coeval rhyolitic effusive and explosive eruptions are commonly observed, and numerical models predict different timescales for the eruption of crystal-rich mushes versus crystal-poor magmas. We compare quartz zonation and diffusion timescales of crystal-rich rhyolitic ignimbrites and crystal-poor rhyolitic lava flows from the Jurassic Chon Aike Province exposed in Patagonia (Argentina). The timescales are assessed by using diffusion modeling based on nanoscale secondary ion mass spectrometry (NanoSIMS) analysis of titanium (Ti) concentration profiles in quartz crystals oriented by image analysis using micro-tomography. Quantitative Ti-data were acquired by SIMS to estimate crystallization temperatures. The textural and geochemical analysis revealed clear differences between crystal-poor rhyolitic lava flows and crystal-rich rhyolitic ignimbrites. Quartz crystals from rhyolitic lava flows display simple oscillatory cathodoluminescence (CL) zoning interpreted to be magmatic and diffusion chronometry suggest a short timescale for quartz crystallization from 5.6 ± 2.2 to 41.6 ± 9.8 years. Resorption textures are rare, and hence crystals in rhyolitic lava flows recorded a simple, rapid extraction, transport and eruption history for these crystal-poor melts. Rhyolitic ignimbrites, in contrast, reveal complex zoning patterns, reflecting several episodes of partial resorption and growth throughout their crystallization history. The complex quartz zoning textures together with longer diffusion times (<350 years), rather suggest a storage in a mush with fluctuating pressure and temperature conditions leading to intermittent resorption. Yet, a final quartz overgrowth rim occurred over a much shorter timescale in the order of years (<3 years). This implies, that crystal-rich mushes can be re-mobilized very fast, as fast as crystal-poor magmas. The use of in-situ methods with a high spatial resolution, like NanoSIMS, is critical to resolve very short magmatic timescales.https://www.frontiersin.org/article/10.3389/feart.2018.00095/fullNanoSIMSdiffusion chronometrymagma storageChon Aike Provincequartz zoning textures |
| spellingShingle | Susanne Seitz Benita Putlitz Lukas Baumgartner Anders Meibom Anders Meibom Stéphane Escrig Anne-Sophie Bouvier A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia) Frontiers in Earth Science NanoSIMS diffusion chronometry magma storage Chon Aike Province quartz zoning textures |
| title | A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia) |
| title_full | A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia) |
| title_fullStr | A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia) |
| title_full_unstemmed | A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia) |
| title_short | A NanoSIMS Investigation on Timescales Recorded in Volcanic Quartz From the Silicic Chon Aike Province (Patagonia) |
| title_sort | nanosims investigation on timescales recorded in volcanic quartz from the silicic chon aike province patagonia |
| topic | NanoSIMS diffusion chronometry magma storage Chon Aike Province quartz zoning textures |
| url | https://www.frontiersin.org/article/10.3389/feart.2018.00095/full |
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