skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ahrensite, γ-Fe2SiO4, a new shock-metamorphic mineral from the Tissint meteorite: Implications for the Tissint shock event on Mars

Journal Article · · Geochimica et Cosmochimica Acta
 [1];  [2];  [1];  [1];  [1];  [3];  [3];  [4]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Univ. of Nevada, Las Vegas, NV (United States)
  3. Carnegie Institution of Washington, Argonne, IL (United States)
  4. Univ. of Tennessee, Knoxville, TN (United States)

Ahrensite (IMA 2013-028), gamma-Fe2SiO4, is the natural Fe-analog of the silicate-spinel ringwoodite (gamma-Mg2SiO4). It occurs in the Tissint Martian meteorite, where it forms through the transformation of the fayalite-rich rims of olivine megacrysts or Ferich microphenocrysts in contact with shock melt pockets. The typical sequence of phase assemblages traversing across a Tissint melt pocket into olivine is: quenched melt or fayalite-pigeonite intergrowth → bridgmanite + wustite → ahrensite and/or ringwoodite double right arrow highly-deformed olivine + nanocrystalline ringwoodite → deformed olivine. We report the first comprehensive set of crystallographic, spectroscopic, and quantitative chemical analysis of type ahrensite, and show that concentrations of ferric iron and inversion in the type material of this newly approved mineral are negligible. We also report the occurrence of nanocrystalline ringwoodite in strained olivine and establish correlations between grain size and distance from melt pockets. The ahrensite and ringwoodite crystals show no preferred orientation, consistent with random nucleation and incoherent growth within a highly strained matrix of olivine. As a result, grain sizes of ahrensite immediately adjacent to melt pockets are consistent with growth during a shock of moderate duration (1-10 ms).

Research Organization:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Contributing Organization:
NSF EAR-0318518 DMR-0080065 U.S. DOE DE-AC02-06CH11357 National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Cooperative Agreement DE-NA0001982 NASA Cosmochemistry grants NNX11AG58G NNX12AH63G NSF grant EAR-1322082 JPL
Grant/Contract Number:
NA0001982; AC02-06CH11357
OSTI ID:
1332393
Alternate ID(s):
OSTI ID: 1374477
Journal Information:
Geochimica et Cosmochimica Acta, Vol. 184, Issue C; ISSN 0016-7037
Publisher:
The Geochemical Society; The Meteoritical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 59 works
Citation information provided by
Web of Science

References (57)

Shock compression of feldspars journal May 1969
Dependence of Site Occupancy and Structural and Electrical Properties on Successive Replacement of Co by Zn in CoFe2O4 journal December 2013
Tissint Martian Meteorite: A Fresh Look at the Interior, Surface, and Atmosphere of Mars journal October 2012
Simulating the thermochemical magmatic and tectonic evolution of Venus's mantle and lithosphere: Two-dimensional models: VENUS'S THERMOCHEMICAL EVOLUTION journal December 2012
The Tissint Martian meteorite as evidence for the largest impact excavation journal January 2013
Mineralogy of the Martian interior up to core-mantle boundary pressures journal March 1997
Ringwoodite, Natural (Mg,Fe)2SiO4 Spinel in the Tenham Meteorite journal March 1969
176Lu–176Hf and 147Sm–143Nd ages of the Martian shergottites: Evaluation of the shock-resetting hypothesis through diffusion kinetic experiments and modeling, and petrological observations journal June 2014
The case for old basaltic shergottites journal February 2008
Forming a Moon with an Earth-like Composition via a Giant Impact journal October 2012
Evidence in Tissint for recent subsurface water on Mars journal September 2015
Ringwoodite growth rates from olivine with ∼75ppmw H2O: Metastable olivine must be nearly anhydrous to exist in the mantle transition zone journal June 2013
Shock-induced deformation of Shergottites: Shock-pressures and perturbations of magmatic ages on Mars journal January 2013
Impact bombardment of the terrestrial planets and the early history of the Solar System journal June 2013
Estimating compositions of natural ringwoodite in the heavily shocked Grove Mountains 052049 meteorite from Raman spectra journal September 2011
High-pressure phases in an ultramafic rock from Mars journal November 2009
Ejection of Martian meteorites journal October 2005
Shear-induced ringwoodite formation in the Martian shergottite Dar al Gani 670 journal August 2013
Two-dimensional detector software: From real detector to idealised image or two-theta scan journal January 1996
Origin and age of the earliest Martian crust from meteorite NWA 7533 journal November 2013
Optical and near infrared spectra of ringwoodite to 21.5 GPa: Implications for radiative heat transport in the mantle journal July 2005
Kinetics of intracrystalline olivine–ringwoodite transformation journal September 2000
Back-transformation of high-pressure phases in a shock melt vein of an H-chondrite during atmospheric passage: Implications for the survival of high-pressure phases after decompression journal January 2004
POWDER CELL – a program for the representation and manipulation of crystal structures and calculation of the resulting X-ray powder patterns journal June 1996
The effect of strain energy on growth rates during the olivine-spinel transformation and implications for olivine metastability in subducting slabs journal October 1998
Shock wave loading and spallation of copper bicrystals with asymmetric Σ3⟨110⟩ tilt grain boundaries journal November 2010
Barioperovskite, BaTiO3, a new mineral from the Benitoite Mine, California journal January 2008
Tistarite, Ti2O3, a new refractory mineral from the Allende meteorite journal May 2009
Tissintite, (Ca, Na, □)AlSi2O6, a highly-defective, shock-induced, high-pressure clinopyroxene in the Tissint martian meteorite journal July 2015
Global resurfacing of Mercury 4.0–4.1 billion years ago by heavy bombardment and volcanism journal July 2013
The standardisation of mineral group hierarchies: application to recent nomenclature proposals [The standardisation of mineral group hierarchies: application to recent nomenclature proposals] journal October 2009
Coherent and subsequent incoherent ringwoodite growth in olivine of shocked L6 chondrites journal June 2010
A sawtooth-like timeline for the first billion years of lunar bombardment journal November 2012
Experimental constraints on the depth of olivine metastability in subducting lithosphere journal December 2001
Cratering Records in the Inner Solar System in Relation to the Lunar Reference System book January 2001
Formation of high-pressure minerals in shocked L6 chondrite Yamato 791384: constraints on shock conditions and parent body size journal November 2004
Shock compression and spallation of palladium bicrystals with a Σ5 grain boundary journal April 2011
Combined method for ab initio structure solution from powder diffraction data journal October 1999
The constitution of the mantle—II journal November 1958
Prediction and confirmation of olivine—spinel transition in Ni2SiO4 journal April 1962
Olivine–Spinel Transformation in Cobalt Orthosilicate journal April 1963
Synthesis of Mg2SiO4-Fe2SiO4 spinel solid solutions journal July 1966
Spectroscopic standards for four- and fivefold-coordinated Fe 2+ in oxygen-based minerals journal July 2001
Thermal modeling of shock melts in Martian meteorites: Implications for preserving Martian atmospheric signatures and crystallization of high-pressure minerals from shock melts journal March 2013
A Reduced Organic Carbon Component in Martian Basalts journal May 2012
Thermodynamics of mantle minerals - II. Phase equilibria journal March 2011
Shock metamorphism of ordinary chondrites journal December 1991
Shock metamorphism and petrography of the Shergotty achondrite journal June 1986
Optical spectroscopic study of tuhualite and a re-examination of the beryl, cordierite, and osumilite spectra journal September 2001
Natural (Mg,Fe)SiO 3 -Ilmenite and -Perovskite in the Tenham Meteorite journal August 1997
Ultrafast growth of wadsleyite in shock-produced melts and its implications for early solar system impact processes journal August 2009
Discovery of bridgmanite, the most abundant mineral in Earth, in a shocked meteorite journal November 2014
Heterogeneous mineral assemblages in martian meteorite Tissint as a result of a recent small impact event on Mars journal September 2014
Host rock solid-state transformation in a shock-induced melt vein of Tenham L6 chondrite journal February 2007
Natural occurrence of Fe 2 SiO 4 -spinel in the shocked Umbarger L6 chondrite journal August 2002
High-pressure phases in a shock-induced melt vein of the Tenham L6 chondrite: Constraints on shock pressure and duration journal January 2006
Petrogenesis of lunar meteorite Northwest Africa 2977: Constraints from in situ microprobe results: Petrogenesis of lunar meteorite NWA 2977 journal December 2010

Cited By (10)

Evidence for the charge disproportionation of iron in extraterrestrial bridgmanite journal January 2020
Shock metamorphism of planetary silicate rocks and sediments: Proposal for an updated classification system journal August 2017
A vacancy‐rich, partially inverted spinelloid silicate, (Mg,Fe,Si) 2 (Si,□)O 4 , as a major matrix phase in shock melt veins of the Tenham and Suizhou L6 chondrites journal July 2019
Silician Magnetite: Si–Fe-Nanoprecipitates and Other Mineral Inclusions in Magnetite from the Olympic Dam Deposit, South Australia journal May 2019
Addendum to “Stöffler, D., Hamann, C., and Metzler, K., Shock metamorphism of planetary silicate rocks and sediments: Proposal for an updated classification system. Meteoritics & Planetary Science 53, 5–49, 2018” journal January 2019
Liebermannite, KAlSi 3 O 8 , a new shock-metamorphic, high-pressure mineral from the Zagami Martian meteorite journal October 2017
Shock-Induced Olivine-Ringwoodite Transformation in the Shock Vein of Chondrite GRV053584 journal April 2018
High‐pressure minerals in shocked meteorites journal July 2017
Evidence of cross-cutting and redox reaction in Khatyrka meteorite reveals metallic-Al minerals formed in outer space journal May 2017
High pressure minerals in the Château-Renard (L6) ordinary chondrite: implications for collisions on its parent body journal June 2018