globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116708
论文题名:
Mineral inclusions are not immutable: Evidence of post-entrapment thermally-induced shape change of quartz in garnet
作者: Cesare B.; Parisatto M.; Mancini L.; Peruzzo L.; Franceschi M.; Tacchetto T.; Reddy S.; Spiess R.; Nestola F.; Marone F.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 555
语种: 英语
中文关键词: garnet ; inclusions ; petrology ; quartz ; X-ray tomographic microscopy
英文关键词: Crystals ; Garnets ; Grain boundaries ; Quartz ; Conceptual frameworks ; Geological history ; Grain-boundary diffusion ; Mineral inclusions ; Petrogenetic process ; Pressure and temperature ; Shape modification ; Thermally induced ; Metamorphic rocks ; garnet ; grain boundary ; granulite facies ; microscopy ; mineralogy ; petrology ; quartz ; X-ray tomography
英文摘要: Sheltered inside crystals, mineral inclusions preserve crucial information on the geological history of our planet. These inclusions allow estimation of the pressure and temperature trajectories of metamorphic rocks, but also can tell about rock mineralogy, provenance, and geodynamic and petrogenetic processes. This information is recovered under the axiom that mineral inclusions have remained immutable objects that do not change shape after their entrapment. Conversely, we show that post-entrapment shape modifications do occur in high-T rocks from granulite-facies conditions. Here we analyze the shape and orientation of quartz inclusions within garnet, a common metamorphic mineral. Our data reveal a progressive change in shape from irregularly-shaped forms in rocks formed at T<550 °C, to combined dodecahedron and icositetrahedron geometries imposed by the host garnet in granulites equilibrated at T>750 °C. Lack of fluid at the quartz-garnet phase boundary indicates that inclusion shape change occurs by thermally-induced grain boundary diffusion, driven by the minimization of the surface energy of the host-inclusion system. Since inclusions acquire a negative crystal shape after entrapment, our discovery redefines the conceptual framework for the application of elastic thermobarometry, and motivates a reevaluation of the criteria for mineral inclusion syngenesis in metamorphic rocks. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165427
Appears in Collections:气候变化与战略

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作者单位: Department of Geosciences, University of Padova, via G. Gradenigo 6, Padova, 35131, Italy; Elettra - Sincrotrone Trieste S.C.p.A., S.S. 14 - km 163.5 in AREA Science Park, Basovizza, 34149, Italy; LINXS – Lund Institute for Advanced Neutron and X-ray Science, Lund, Sweden; Istituto di Geoscienze e Georisorse, CNR, via G. Gradenigo 6, Padova, 35131, Italy; Department of Mathematics and Geosciences, University of Trieste, via E. Weiss, 2, Trieste, 34128, Italy; School of Earth and Planetary Sciences, Curtin University, Bentley, Perth, 6102, Australia; Paul Scherrer Institut, Photon Science Department, WBBA/216, Forschungsstrasse 111, Villigen, CH-5232, Switzerland

Recommended Citation:
Cesare B.,Parisatto M.,Mancini L.,et al. Mineral inclusions are not immutable: Evidence of post-entrapment thermally-induced shape change of quartz in garnet[J]. Earth and Planetary Science Letters,2021-01-01,555
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