Effects of superheating magnitude on olivine growth
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| הוצא לאור ב: | Contributions to Mineralogy and Petrology vol. 175, no. 2 (Feb 2020) |
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| מחברים אחרים: | , |
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Springer Nature B.V.
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| גישה מקוונת: | Citation/Abstract Full Text - PDF |
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MARC
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| 100 | 1 | |a First, Emily C |u University of Hawai‘i at Mānoa, Department of Geology and Geophysics, Honolulu, USA (GRID:grid.410445.0) (ISNI:0000 0001 2188 0957); Brown University, Department of Earth, Environmental and Planetary Sciences, Providence, USA (GRID:grid.40263.33) (ISNI:0000 0004 1936 9094) | |
| 245 | 1 | |a Effects of superheating magnitude on olivine growth | |
| 260 | |b Springer Nature B.V. |c Feb 2020 | ||
| 513 | |a Journal Article | ||
| 520 | 3 | |a Magmatic superheating is a condition with relevance to natural systems as well as experimental studies of crystallization kinetics. Magmas on Earth and other planetary bodies may become superheated during adiabatic ascent from the mantle or as a consequence of meteorite impact-generated crustal melting. Experimental studies of igneous processes commonly employ superheating in the homogenization of synthetic starting materials. We performed 1-atmosphere dynamic crystallization experiments to study the effects of superliquidus thermal history on the morphologies and compositions of subsequently grown olivine crystals. An ultramafic volcanic rock with abundant olivine was fused above the experimentally determined liquidus temperature (1395 °C), held for 0, 3, or 12 h, cooled at 25 °C h−1, and quenched from 200 °C below the liquidus, all at constant fO2, corresponding to FMQ-2 ± 0.2 log units. An increase in olivine morphologic instability is correlated with superheating magnitude, parameterized as the integrated time the sample is held above the liquidus (“TtL”;  °C h). We infer that a delay in nucleation, which intensifies monotonically with increasing TtL, causes crystal growth to be increasingly rapid. This result indicates that the structural relaxation time scale controlling the formation of crystal nuclei is (a) far longer than the time scale associated with viscous flow and (b) exceeds the liquidus dwell times typically imposed in crystallization experiments. The influence of magmatic superheating on crystal morphology is similar in sense and magnitude to that of subliquidus cooling rate and thus, both factors should be considered when interpreting the thermal history of a volcanic rock containing anhedral olivine. | |
| 653 | |a Crystal structure | ||
| 653 | |a Nucleation | ||
| 653 | |a Volcanic rocks | ||
| 653 | |a Olivine | ||
| 653 | |a Crystallization | ||
| 653 | |a Lava | ||
| 653 | |a Meteorite collisions | ||
| 653 | |a Kinetics | ||
| 653 | |a Crystal growth | ||
| 653 | |a Superheating | ||
| 653 | |a Cooling rate | ||
| 653 | |a Time | ||
| 653 | |a Ascent | ||
| 653 | |a Magma | ||
| 653 | |a Crystals | ||
| 653 | |a Viscous flow | ||
| 653 | |a Relaxation time | ||
| 653 | |a Earth | ||
| 653 | |a Dwell time | ||
| 653 | |a Liquidus | ||
| 653 | |a Crystal morphology | ||
| 653 | |a Mineralogy | ||
| 653 | |a Petrology | ||
| 653 | |a Environmental | ||
| 700 | 1 | |a Leonhardi, Tanis C |u University of Hawai‘i at Mānoa, Department of Geology and Geophysics, Honolulu, USA (GRID:grid.410445.0) (ISNI:0000 0001 2188 0957); University of California, Berkeley, Department of Earth and Planetary Science, Berkeley, USA (GRID:grid.47840.3f) (ISNI:0000 0001 2181 7878) | |
| 700 | 1 | |a Hammer, Julia E |u University of Hawai‘i at Mānoa, Department of Geology and Geophysics, Honolulu, USA (GRID:grid.410445.0) (ISNI:0000 0001 2188 0957) | |
| 773 | 0 | |t Contributions to Mineralogy and Petrology |g vol. 175, no. 2 (Feb 2020) | |
| 786 | 0 | |d ProQuest |t Science Database | |
| 856 | 4 | 1 | |3 Citation/Abstract |u https://www.proquest.com/docview/2343362513/abstract/embedded/75I98GEZK8WCJMPQ?source=fedsrch |
| 856 | 4 | 0 | |3 Full Text - PDF |u https://www.proquest.com/docview/2343362513/fulltextPDF/embedded/75I98GEZK8WCJMPQ?source=fedsrch |