AIQUILE

Stony

TIPO:

CLASSE:

CLAN:

GRUPO:

SUB-GRUPO:

TIPO PET.:

EST. CHOQUE:

INTERPERISMO:

PAÍS:

ANO:

DESCRIÇÃO:

CHONDRITE

ORDINARY

H-L-LL

H

-

5

S3

W0

BOLIVIA

2016

Chondritic texture and mineral composition of an equilibrated ordinary chondite. Chemical and petrological type is H5. Shock stage S3 and weathering W0.

PETROGRAFIA:

Moderate shock stage (S3), chondritic texture and mineral composition of an equilibrated ordinary chondrite of petrologic chondrite type 5. Porphyritic olivine and radial pyroxene chondrites are dominant.

GEOQUÍMICA:

Analyzes by electron microprobe show an equilibrated composition of olivine and pyroxene. Olivine (Fa18.3 ± 0.5; n = 53), pyroxene with low Ca content (Fs 15.7 ± 0.7; n = 37). The average Cr2O3 of olivine is 0.048% by weight for the matrix and clast areas.

CLASSIFICAÇÃO:

Classification of H group is based on: average chondrules diameter (~ 0.3 mm), metallic Fe content, Ni + FeS (9.9 vol%), Kamacite Co content (0 - 0.3% in Weight). Type 5 as the petrological classification is based on chondritic texture and plagioclase <50 μm. S3 shock is based on wave extinction, irregular olivine fractures. Most of the fragments do not appear to be a breaccia, but some have slightly darker gray clasts with indiscernible limits under the microscope. Although both areas show identical composition, the darker areas show apparently well-defined cores. Catodoluminescence images are also very similar in the two areas. Some isolated areas and small dark inclusions were observed.

CLASSIFICADORES:

M.E. Zucolotto (MN/UFRJ) and A. Tosi, (LABSONDA/IGEO/UFRJ)

HISTÓRIA:

A bright fireball appeared over Aiquile, Cochabamba district, Bolivia, on November 20, 2016, 17:57, local time (UTC-4). The stones fell in a field spread at least 12 × 2 km (northeast) in the following communities of Aiquile: Tablamayu, Panama, Chawar Mayu, Chaqo K'asa, Barbechos and Cruz Loma. The main fragmentation of the bolide occurred over the Tablamayu community, 12 km north of Aiquile. In the community of Cruz Loma, C. Veizaga witnessed the fall of the largest stone (36.3 kg) about 500 m from him. He recovered the stone and the next day the local government of Aiquile (Luiz L. Arnez, Marco Cardona, Franz Navia, Guilherme Rodriguez, Jesus Yave) took the stone to the city museum. In the Panamanian community, Roberto Soto witnessed the fall and recovered two other fragments (565 g, 2.2 kg). SERGEOMIN (Miguel A. Muriel, G. Villca, A. Perez), UMSA (Gonzalo Pereira), Brazilian collaborators (André R. Moutinho, José M. Monzon) and S. Medina found additional fragments in the Panama community. A. Moutinho found a 98 g fragment that was used for classification.

Todas as informações que não possuírem fonte especifica, foram extraídas do Meteoritical Bulletin Database.

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