气候变化领域集成服务门户(CCPortal): Mineral inclusions are not immutable: Evidence of post-entrapment thermally-induced shape change of quartz in garnet

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DOI	10.1016/j.epsl.2020.116708
	Mineral inclusions are not immutable: Evidence of post-entrapment thermally-induced shape change of quartz in garnet
	Cesare B.; Parisatto M.; Mancini L.; Peruzzo L.; Franceschi M.; Tacchetto T.; Reddy S.; Spiess R.; Nestola F.; Marone F.
发表日期	2021
ISSN	0012821X
卷号	555
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.
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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/203049
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
推荐引用方式 GB/T 7714	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],2021,555.
APA	Cesare B..,Parisatto M..,Mancini L..,Peruzzo L..,Franceschi M..,...&Marone F..(2021).Mineral inclusions are not immutable: Evidence of post-entrapment thermally-induced shape change of quartz in garnet.Earth and Planetary Science Letters,555.
MLA	Cesare B.,et al."Mineral inclusions are not immutable: Evidence of post-entrapment thermally-induced shape change of quartz in garnet".Earth and Planetary Science Letters 555(2021).