1-20 OF 99 RESULTS FOR

reidite

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
×Close Modal
Sort by
Journal Article
Published: 01 June 2019
American Mineralogist (2019) 104 (6): 830-837.
...Claudia Stangarone; Ross J. Angel; Mauro Prencipe; Boriana Mihailova; Matteo Alvaro Abstract The structure, the elastic properties, and the Raman frequencies of the zircon and reidite polymorphs of ZrSiO 4 were calculated as a function of hydrostatic pressure up to 30 GPa using HF/DFT ab initio...
FIGURES | View All (8)
Journal Article
Journal: Geology
Published: 01 May 2019
Geology (2019) 47 (5): e465.
Journal Article
Journal: Geology
Published: 01 May 2019
Geology (2019) 47 (5): e466.
Journal Article
Journal: Geology
Published: 27 September 2018
Geology (2018) 46 (11): 983-986.
... in zircon from a central uplift. We report both shock twins and reidite, the high-pressure ZrSiO 4 polymorph, in zircon from shocked granitic gneiss drilled from the center of the >60-km-diameter Woodleigh impact structure in Western Australia. The key observation is that in zircon grains that contain...
FIGURES
Journal Article
Journal: Geology
Published: 20 December 2017
Geology (2017) 46 (3): 203-206.
... of the source crater. The former presence of reidite, a high-pressure polymorph of zircon, was detected in granular zircon grains within Muong Nong–type tektites from Thailand. The zircon grains are surrounded by tektite glass and are composed of micrometer-sized neoblasts that contain inclusions of ZrO 2...
FIGURES
Journal Article
Journal: Geology
Published: 01 September 2016
Geology (2016) 44 (9): 703-706.
... that each grain consists of multiple domains, some with boundaries disoriented by 65° around <110>, a known {112} shock-twin orientation. Other domains have {001} in alignment with {110} of neighboring domains, consistent with the former presence of the high-pressure ZrSiO 4 polymorph reidite...
Journal Article
Journal: Geology
Published: 01 October 2015
Geology (2015) 43 (10): 899-902.
... tectonics, erosion, and deposition of younger rocks that may destroy or cover the evidence. Here we report the first Precambrian occurrence of the rare mineral reidite (ZrSiO 4 ) within grains of shocked zircon in the ca. 1.18 Ga Stac Fada Member (Stoer Group), northwestern Scotland. The reidite, preserved...
FIGURES | View All (4)
Journal Article
Journal: Geology
Published: 01 April 2015
Geology (2015) 43 (4): 315-318.
..., and above 20 GPa transforms to reidite, a high-pressure ZrSiO 4 polymorph diagnostic of impact. However, the utility of reidite has been limited by its occurrence; it has only been reported from three relatively young (<36 Ma) impact craters globally. Here we report a new occurrence of reidite...
FIGURES
Journal Article
Published: 01 January 2004
American Mineralogist (2004) 89 (1): 197-203.
... volume V 0 = 260.89 ± 0.03 Å 3 , when (∂ K T 0 /∂ P ) T = K ′ T 0 is fixed at 4. This bulk modulus is over 12% lower than that suggested by earlier measurements using impure, natural zircon sample. In addition, we observed the start of the transformation of zircon to reidite (scheelite-structured ZrSiO...
FIGURES | View All (5)
Journal Article
Published: 01 November 2003
American Mineralogist (2003) 88 (11-12): 1663-1667.
...Ian Farnan; Etienne Balan; Chris J. Pickard; Francesco Mauri Abstract Periodic density functional theory (DFT) was used to calculate the structure of zircon (ZrSiO 4 ) and reidite (scheelite polymorph of ZrSiO 4 ) at pressures from 0-41 GPa. Subsequently, the 29Si nuclear magnetic resonance (NMR...
FIGURES | View All (6)
Journal Article
Published: 01 April 2002
American Mineralogist (2002) 87 (4): 562-565.
...Billy P. Glass; Shaobin Liu; Peter B. Leavens Abstract Reidite is a high-pressure polymorph of zircon with the scheelite structure. It has been found in an upper Eocene impact ejecta layer in marine sediments on the upper continental slope off New Jersey and on Barbados. Reidite occurs (epitaxially...
FIGURES
Journal Article
Published: 01 October 2004
Mineralogical Magazine (2004) 68 (5): 801-811.
...A. Gucsik; M. Zhang; C. Koeberl; E. K. H. Salje; S. A. T. Redfern; J. M. Pruneda Abstract Zircon- and reidite-type ZrSiO 4 produced by shock recovery experiments at different pressures have been studied using infrared (IR) and Raman spectroscopy. The ν 3 vibration of the SiO 4 group in shocked...
FIGURES | View All (8)
Journal Article
Published: 01 January 2004
American Mineralogist (2004) 89 (1): 185-188.
...Shigeaki Ono; Yoshinori Tange; Ikuo Katayama; Takumi Kikegawa Abstract The compressibility of zircon and reidite (ZrSiO 4 ) was investigated by powder X-ray diffraction (XRD) up to 20 GPa using a synchrotron radiation source. Reliable equations of state for zircon and reidite were obtained using...
FIGURES | View All (6)
Journal Article
Journal: Geology
Published: 02 May 2019
Geology (2019)
... generate shockwaves at the level of billions of pascals on the ground. Here we report the presence in LDG of granular zircon grains that are comprised of neoblasts that preserve systematic crystallographic orientation relations that uniquely form during reversion from reidite, a 30 GPa high-pressure ZrSiO...
Journal Article
Journal: Geology
Published: 07 September 2018
Geology (2018) 46 (10): 891-894.
... domains. The neoblast orientations are produced uniquely by transformation to the high-pressure polymorph reidite and its subsequent reversion to neoblastic zircon at high-temperature conditions, as evidenced by the occurrence of ZrO 2 . We here refer to such granular grains that preserve orientation...
FIGURES | View All (4)
Series: GSA Special Papers
Published: 01 October 2015
DOI: 10.1130/2015.2518(09)
... of reidite, and recrystallized grains. The overall pattern with increasing shock level is that of metamict, low-crystallinity zircon in basement gneiss outside the impact structure, increased crystallinity and preservation of reidite in an intermediate-shock-level sample, and highly crystalline, annealed...
Image
Interatomic distances (angstroms) and angles of zircon and <b>reidite</b> in the s...
Published: 01 June 2019
Figure 2. Interatomic distances (angstroms) and angles of zircon and reidite in the simulated structures at zero pressure. Only one-half of each SiO 4 tetrahedron is shown for each polymorph. Note that in zircon two O atoms are shared by one Si and one Zr and form a shared polyhedral edge
Image
Variation of the enthalpy change Δ H  for the zircon to <b>reidite</b> transition ...
Published: 01 June 2019
Figure 6. Variation of the enthalpy change Δ H for the zircon to reidite transition with pressure calculated from DFT at 0 K, showing that the equilibrium transition pressure is 9.13(1) GPa.
Image
Conceptual model of former <b>reidite</b> in granular neoblastic (FRIGN) zircon fo...
in > Geology
Published: 07 September 2018
Figure 4. Conceptual model of former reidite in granular neoblastic (FRIGN) zircon formation, including (001) pole figures for zircon, reidite, and FRIGN zircon (top row), the microstructural evolution (middle row), and pressure ( P ) and temperature ( T ) curves (bottom row). A: Pre-impact
Image
Former <b>reidite</b> in granular neoblastic (FRIGN) zircon in Luizi (Democratic R...
in > Geology
Published: 07 September 2018
Figure 2. Former reidite in granular neoblastic (FRIGN) zircon in Luizi (Democratic Republic of the Congo) impact melt rock. A: Backscattered electron (BSE) image showing a granular zircon with ZrO 2 inclusions. CL—cathodoluminescence image. B: Inverse pole figure map (IPFx) showing neoblast