Title :

The Winchcombe meteorite—A regolith breccia from a rubble pile CM chondrite asteroid

Author(s) :

Suttle, M. D. [Auteur]
The Open University [Milton Keynes] [OU]
Daly, L. [Auteur]

Jones, R. H. [Auteur]
University of Manchester [Manchester]
Jenkins, L. [Auteur]

Van Ginneken, M. [Auteur]
University of Kent [Canterbury]
Mitchell, J. T. [Auteur]
Plymouth University
Bridges, J. C. [Auteur]
University of Leicester
Hicks, L. J. [Auteur]
University of Leicester
Johnson, D. [Auteur]
Cranfield University
Rollinson, G. [Auteur]
University of Exeter
Taylor, R. [Auteur]
Genge, M. J. [Auteur]
Imperial College London
Schröder, C. [Auteur]
University of Stirling
Trimby, P. [Auteur]
University of Oxford
Mansour, H. [Auteur]
University of Oxford
Piazolo, S. [Auteur]
University of Leeds
Bonsall, E. [Auteur]
University of Stirling
Salge, T. [Auteur]
The Natural History Museum [London] [NHM]
Heard, R. [Auteur]
The Natural History Museum [London] [NHM]
Findlay, R. [Auteur]
The Open University [Milton Keynes] [OU]
King, A. J. [Auteur]
The Natural History Museum [London] [NHM]
Bates, H. C. [Auteur]
The Natural History Museum [London] [NHM]
Lee, M. R. [Auteur]
School of Geographical and Earth Sciences, University of Glasgow
Stephen, N. R. [Auteur]
Plymouth University
Willcocks, F. M. [Auteur]
Plymouth University
Greenwood, R. C. [Auteur]
The Open University [Milton Keynes] [OU]
Franchi, I. A. [Auteur]
The Open University [Milton Keynes] [OU]
Russell, S. S. [Auteur]
The Natural History Museum [London] [NHM]
Harrison, C. S. [Auteur]
The Natural History Museum [London] [NHM]
Schofield, P. F. [Auteur]
The Natural History Museum [London] [NHM]
Almeida, N. V. [Auteur]
The Natural History Museum [London] [NHM]
Floyd, C. [Auteur]

Martin, P.‐E. [Auteur]

Joy, K. H. [Auteur]
University of Manchester [Manchester]
Wozniakiewicz, P. J. [Auteur]
Hallatt, Daniel [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Burchell, M. J. [Auteur]
University of Kent [Canterbury]
Alesbrook, L. S. [Auteur]
University of Kent [Canterbury]
Spathis, V. [Auteur]
University of Kent [Canterbury]
Cornwell, L. T. [Auteur]
University of Kent [Canterbury]
Dignam, A. [Auteur]
University of Kent [Canterbury]

Journal title :

Meteoritics & Planetary Science

Abbreviated title :

Meteorit & Planetary Scien

Publisher :

Wiley

Publication date :

2022-12-21

HAL domain(s) :

Chimie/Matériaux

English abstract : [en]

AbstractThe Winchcombe meteorite is a CM chondrite breccia composed of eight distinct lithological units plus a cataclastic matrix. The degree of aqueous alteration varies between intensely altered CM2.0 and moderately ...
Show more >AbstractThe Winchcombe meteorite is a CM chondrite breccia composed of eight distinct lithological units plus a cataclastic matrix. The degree of aqueous alteration varies between intensely altered CM2.0 and moderately altered CM2.6. Although no lithology dominates, three heavily altered rock types (CM2.1–2.3) represent >70 area%. Tochilinite–cronstedtite intergrowths (TCIs) are common in several lithologies. Their compositions can vary significantly, even within a single lithology, which can prevent a clear assessment of alteration extent if only TCI composition is considered. We suggest that this is due to early alteration under localized geochemical microenvironments creating a diversity of compositions and because later reprocessing was incomplete, leaving a record of the parent body's fluid history. In Winchcombe, the fragments of primary accretionary rock are held within a cataclastic matrix (~15 area%). This material is impact‐derived fallback debris. Its grain size and texture suggest that the disruption of the original parent asteroid responded by intergranular fracture at grain sizes <100 μm, while larger phases, such as whole chondrules, splintered apart. Re‐accretion formed a poorly lithified body. During atmospheric entry, the Winchcombe meteoroid broke apart with new fractures preferentially cutting through the weaker cataclastic matrix and separating the breccia into its component clasts. The strength of the cataclastic matrix imparts a control on the survival of CM chondrite meteoroids. Winchcombe's unweathered state and diversity of lithologies make it an ideal sample for exploring the geological history of the CM chondrite group.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2024-01-06T08:49:52Z
2024-01-26T12:16:50Z
2024-01-26T12:18:15Z