CaltechAUTHORS
  A Caltech Library Service

New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆

Ma, Chi and Beckett, John R. and Tissot, François L. H. and Rossman, George R. (2022) New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca₃TiSi₂(Al,Ti,Si)₃O₁₄, and burnettite, CaVAlSiO₆. Meteoritics and Planetary Science, 57 (6). pp. 1300-1324. ISSN 1086-9379. doi:10.1111/maps.13826. https://resolver.caltech.edu/CaltechAUTHORS:20220610-213596000

[img] PDF - Published Version
See Usage Policy.

3MB
[img] MS Word (Tables S1-S2) - Supplemental Material
See Usage Policy.

21kB

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20220610-213596000

Abstract

Paqueite (Ca₃TiSi₂[Al,Ti,Si]₃O₁₄; IMA 2013-053) and burnettite (CaVAlSiO₆; IMA 2013-054) are new refractory minerals, occurring as euhedral to subhedral crystals within aluminous melilite in A-WP1, a type A Ca-Al-rich inclusion, and CGft-12, a compact type A (CTA) from the Allende CV3 carbonaceous chondrite. Type paqueite from A-WP1 has an empirical formula of (Ca_(2.91)Na_(0.11))Ti⁴⁺Si₂(Al_(1.64)Ti⁴⁺_(0.90)Si_(0.24)V³⁺_(0.12)Sc_(0.07)Mg_(0.03))O₁₄, with a trigonal structure in space group P321 and cell parameters a = 7.943 Å, c = 4.930 Å, V = 269.37 Å3, and Z = 1. Paqueite’s general formula is Ca₃TiSi₂(Al,Ti,Si)₃O₁₄ and the endmember formula is Ca₃TiSi₂(Al₂Ti)O₁₄. Type burnettite from CGft-12 has an empirical formula of Ca_(1.01)(V³⁺_(0.56)Al_(0.25)Mg_(0.18))(Si_(1.19)Al_(0.81))O₆. It assumes a diopside-type C2/c structure with a = 9.80 Å, b = 8.85 Å, c = 5.36 Å, β = 105.6°, V = 447.7 ų, and Z = 4. Burnettite’s general formula is Ca(V,Al,Mg)AlSiO₆ and the endmember formula is CaVAlSiO₆. Paqueite and burnettite likely originated as condensates, but the observed grains may have crystallized from local V-rich melts produced during a later thermal event. For CGft-12, the compositions of paqueite, clinopyroxene, and perovskite suggest that type As drew from two distinct populations of grains. Hibonite grains drew from multiple populations, but these were well mixed and not equilibrated prior to incorporation into type A host melilite.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1111/maps.13826DOIArticle
https://onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1111%2Fmaps.13826&file=maps13826-sup-0001-TableS1-S2.docxPublisherSupporting Information
ORCID:
AuthorORCID
Ma, Chi0000-0002-1828-7033
Tissot, François L. H.0000-0001-6622-2907
Rossman, George R.0000-0002-4571-6884
Alternate Title:New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca3TiSi2(Al,Ti,Si)3O14, and burnettite, CaVAlSiO6
Additional Information:© 2022 The Meteoritical Society. Issue Online: 07 June 2022; Version of Record online: 12 May 2022; Manuscript accepted: 12 April 2022; Manuscript received: 14 October 2021. We gratefully acknowledge Philipp Heck for the loan of samples from the Field Museum of Chicago. SEM, EBSD, and EPMA analyses were carried out at the Caltech GPS Division Analytical Facility, which is supported, in part, by NSF Grants EAR-0318518 and DMR-0080065. We thank Marina Ivanova and associate editor Yves Marrocchi for their constructive reviews. Data Availability Statement: Data available on request from the authors.
Funders:
Funding AgencyGrant Number
NSFEAR-0318518
NSFDMR-0080065
Issue or Number:6
DOI:10.1111/maps.13826
Record Number:CaltechAUTHORS:20220610-213596000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220610-213596000
Official Citation:Ma, C., Beckett, J.R., Tissot, F.L.H. and Rossman, G.R. (2022), New minerals in type A inclusions from Allende and clues to processes in the early solar system: Paqueite, Ca3TiSi2(Al,Ti,Si)3O14, and burnettite, CaVAlSiO6. Meteorit Planet Sci, 57: 1300-1324. https://doi.org/10.1111/maps.13826
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115133
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Jun 2022 17:27
Last Modified:13 Jun 2022 17:27

Repository Staff Only: item control page