Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data
We investigate the composition of C-type asteroids and comets providing insights with the combined petrographic and spectroscopic study of micrometeorites (MMs) (TAM5.29, TAM5.30, TAM18c.11 and TAM18c.13) and laboratory experiments on carbonaceous chondrites (CCs): FRO95002, FRO99040 and FRO90006 (C...
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Università degli studi di Padova
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ftunivpadovairis:oai:www.research.unipd.it:11577/3423301 2024-04-14T08:03:21+00:00 Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data Nava, Jacopo Nava, Jacopo Massironi, Matteo Agnini, Claudia 2019-12 http://hdl.handle.net/11577/3423301 eng eng Università degli studi di Padova http://hdl.handle.net/11577/3423301 info:eu-repo/semantics/openAccess Carbonaceous Chondrite Micrometeorite Cryovolcanism C-type Asteroid Hydrothermal Alteration Settore GEO/07 - Petrologia e Petrografia info:eu-repo/semantics/doctoralThesis 2019 ftunivpadovairis 2024-03-21T19:56:36Z We investigate the composition of C-type asteroids and comets providing insights with the combined petrographic and spectroscopic study of micrometeorites (MMs) (TAM5.29, TAM5.30, TAM18c.11 and TAM18c.13) and laboratory experiments on carbonaceous chondrites (CCs): FRO95002, FRO99040 and FRO90006 (CO3 CCs), MCY14001 (CM2) and DaG521 (CV3). The composition of C-type asteroids is similar to that of CCs. The IR reflectance spectra of C-type asteroids show some unresolved features, in particular the 3 μm band is difficult to attribute to a specific compound and the origin of the organic matter indicated by the 3.4-3.5 μm bands is still debated. The main processes suggested to create these features are low-T aqueous alteration, hydrothermalism and cryovolcanism. TAM5.29 is dominated by a matrix of Fe-olivines and clasts of andradite surrounded by diopside-jarosite derived from hydrothermal alteration at T~250°C. A second episode of alteration at T<100°C resulted in the formation of iddingsite. TAM5.29 mineralogy is unique among the MMs and is also different from the known CV CCs representing a newly described alteration environment on the CV parent body. TAM18c.11 and TAM18c.13 have a high Antarctic alteration with widespread replacement with jarosite. Phyllosilicates are recognisable along with small metal alloys and CH, SH and NH functional groups are ubiquitous. TAM5.30 is a CO-like MM and records a processing history characterised by an initial episode of low-temperature CM-like aqueous alteration, which later transitioned into higher temperature (~300°C) CV-like metasomatic alteration. The 3.15 μm band of TAM5.29 is found scattered around the matrix, thus related to Fe-rich hydrous phases. An isolated spot gave spectra characterised by a 3.04 μm band that always appears together with the 3.4 μm and 3.5 μm bands of the aliphatic organics, indicating a relation between the 3.04 μm band and the organic matter. In TAM18c.11 the 3 μm is found at 3.05-3.06 μm in close relationship with ammonium-jarosite. Spectra of ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Padua Research Archive (IRIS - Università degli Studi di Padova) Antarctic |
institution |
Open Polar |
collection |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
op_collection_id |
ftunivpadovairis |
language |
English |
topic |
Carbonaceous Chondrite Micrometeorite Cryovolcanism C-type Asteroid Hydrothermal Alteration Settore GEO/07 - Petrologia e Petrografia |
spellingShingle |
Carbonaceous Chondrite Micrometeorite Cryovolcanism C-type Asteroid Hydrothermal Alteration Settore GEO/07 - Petrologia e Petrografia Nava, Jacopo Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
topic_facet |
Carbonaceous Chondrite Micrometeorite Cryovolcanism C-type Asteroid Hydrothermal Alteration Settore GEO/07 - Petrologia e Petrografia |
description |
We investigate the composition of C-type asteroids and comets providing insights with the combined petrographic and spectroscopic study of micrometeorites (MMs) (TAM5.29, TAM5.30, TAM18c.11 and TAM18c.13) and laboratory experiments on carbonaceous chondrites (CCs): FRO95002, FRO99040 and FRO90006 (CO3 CCs), MCY14001 (CM2) and DaG521 (CV3). The composition of C-type asteroids is similar to that of CCs. The IR reflectance spectra of C-type asteroids show some unresolved features, in particular the 3 μm band is difficult to attribute to a specific compound and the origin of the organic matter indicated by the 3.4-3.5 μm bands is still debated. The main processes suggested to create these features are low-T aqueous alteration, hydrothermalism and cryovolcanism. TAM5.29 is dominated by a matrix of Fe-olivines and clasts of andradite surrounded by diopside-jarosite derived from hydrothermal alteration at T~250°C. A second episode of alteration at T<100°C resulted in the formation of iddingsite. TAM5.29 mineralogy is unique among the MMs and is also different from the known CV CCs representing a newly described alteration environment on the CV parent body. TAM18c.11 and TAM18c.13 have a high Antarctic alteration with widespread replacement with jarosite. Phyllosilicates are recognisable along with small metal alloys and CH, SH and NH functional groups are ubiquitous. TAM5.30 is a CO-like MM and records a processing history characterised by an initial episode of low-temperature CM-like aqueous alteration, which later transitioned into higher temperature (~300°C) CV-like metasomatic alteration. The 3.15 μm band of TAM5.29 is found scattered around the matrix, thus related to Fe-rich hydrous phases. An isolated spot gave spectra characterised by a 3.04 μm band that always appears together with the 3.4 μm and 3.5 μm bands of the aliphatic organics, indicating a relation between the 3.04 μm band and the organic matter. In TAM18c.11 the 3 μm is found at 3.05-3.06 μm in close relationship with ammonium-jarosite. Spectra of ... |
author2 |
Nava, Jacopo Massironi, Matteo Agnini, Claudia |
format |
Doctoral or Postdoctoral Thesis |
author |
Nava, Jacopo |
author_facet |
Nava, Jacopo |
author_sort |
Nava, Jacopo |
title |
Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
title_short |
Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
title_full |
Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
title_fullStr |
Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
title_full_unstemmed |
Mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
title_sort |
mineralogical composition and geological features of c-type asteroids inferred from meteorites and space missions data |
publisher |
Università degli studi di Padova |
publishDate |
2019 |
url |
http://hdl.handle.net/11577/3423301 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://hdl.handle.net/11577/3423301 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1796299593910059008 |