U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration

We present the first age determinations of zircon from the diamondiferous Catoca kimberlite in northeastern Angola, the fourth largest kimberlite body in the world. The U-Pb ages were obtained using a Sensitive High Resolution Ion Microprobe II (SHRIMP II) on zircon crystals derived from tuffisitic...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Robles-Cruz, S.E., Escayola, M., Jackson, S., Galí, S., Pervov, V., Watangua, M., Gonçalves, A., Melgarejo, J.C.
Formato: JOUR
Materias:
Catoca kimberlite
Diamond
Geochronology
SHRIMP
U-Pb dating
Zircon
Age determination
Diamond exploration
Early Cretaceous
Kimberlite body
Mantle source
Mean square
Regional tectonics
Sedimentary units
Sensitive high-resolution ion microprobe
South Atlantic
Tectonic settings
U-Pb ages
U-Pb SHRIMP
Weighted mean
Zircon crystals
Diamond deposits
Diamonds
Lead
Minerals
Shellfish
Tectonics
Albian
Aptian
diamond
geochronology
kimberlite
mantle source
metasomatism
mineral exploration
SHRIMP dating
uranium-lead dating
zircon
Angola
Decapoda (Crustacea)
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00092541_v310-311_n_p137_RoblesCruz
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00092541_v310-311_n_p137_RoblesCruz
record_format dspace
spelling todo:paper_00092541_v310-311_n_p137_RoblesCruz2023-10-03T14:08:11Z U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration Robles-Cruz, S.E. Escayola, M. Jackson, S. Galí, S. Pervov, V. Watangua, M. Gonçalves, A. Melgarejo, J.C. Catoca kimberlite Diamond Geochronology SHRIMP U-Pb dating Zircon Age determination Catoca kimberlite Diamond exploration Early Cretaceous Kimberlite body Mantle source Mean square Regional tectonics Sedimentary units Sensitive high-resolution ion microprobe SHRIMP South Atlantic Tectonic settings U-Pb ages U-Pb dating U-Pb SHRIMP Weighted mean Zircon crystals Diamond deposits Diamonds Geochronology Lead Minerals Shellfish Zircon Tectonics Albian Aptian diamond geochronology kimberlite mantle source metasomatism mineral exploration SHRIMP dating uranium-lead dating zircon Angola Decapoda (Crustacea) We present the first age determinations of zircon from the diamondiferous Catoca kimberlite in northeastern Angola, the fourth largest kimberlite body in the world. The U-Pb ages were obtained using a Sensitive High Resolution Ion Microprobe II (SHRIMP II) on zircon crystals derived from tuffisitic kimberlite rocks and heavy-mineral concentrates from the Catoca kimberlite. The SHRIMP results define a single weighted mean age of 117.9. ± 0.7 Ma (Mean square weighted deviation MSWD = 1.3). More than 90% of the results indicate a single age population. There is no evidence for variable ages within single crystals, and no diffusional profiles are preserved. These data are interpreted as the maximum age of the kimberlite eruption at Catoca. The U/Th values suggest at least two different sources of zircon crystals. These different populations may reflect different sources of kimberlitic magma, with some of the grains produced in U- and Th-enriched metasomatized mantle units. This idea is consistent with the two populations of zircon identified in this study. One population originated from a depleted mantle source with low total REE (less than 25. ppm), and the other was derived from an enriched source, likely from the mantle or a carbonatite-like melt with high total REE (up to 123. ppm).The tectonic setting of northeastern Angola is influenced by the opening of the south Atlantic, which reactivated deep NE-SW-trending faults during the early Cretaceous. The eruption of the Catoca kimberlite can be correlated with these regional tectonic events. The Calonda Formation (Albian-Cenomanian age) is the earliest sedimentary unit that incorporates eroded material derived from the diamondiferous kimberlites. Thus, the age of the Catoca kimberlite eruption is restricted to the time between the middle of the Aptian and the Albian. The new interpretation will be an important guide in future exploration for diamonds because it provides precise data on the age of a diamond-bearing kimberlite pulse in Angola. © 2012 Elsevier B.V. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00092541_v310-311_n_p137_RoblesCruz
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Catoca kimberlite
Diamond
Geochronology
SHRIMP
U-Pb dating
Zircon
Age determination
Catoca kimberlite
Diamond exploration
Early Cretaceous
Kimberlite body
Mantle source
Mean square
Regional tectonics
Sedimentary units
Sensitive high-resolution ion microprobe
SHRIMP
South Atlantic
Tectonic settings
U-Pb ages
U-Pb dating
U-Pb SHRIMP
Weighted mean
Zircon crystals
Diamond deposits
Diamonds
Geochronology
Lead
Minerals
Shellfish
Zircon
Tectonics
Albian
Aptian
diamond
geochronology
kimberlite
mantle source
metasomatism
mineral exploration
SHRIMP dating
uranium-lead dating
zircon
Angola
Decapoda (Crustacea)
spellingShingle Catoca kimberlite
Diamond
Geochronology
SHRIMP
U-Pb dating
Zircon
Age determination
Catoca kimberlite
Diamond exploration
Early Cretaceous
Kimberlite body
Mantle source
Mean square
Regional tectonics
Sedimentary units
Sensitive high-resolution ion microprobe
SHRIMP
South Atlantic
Tectonic settings
U-Pb ages
U-Pb dating
U-Pb SHRIMP
Weighted mean
Zircon crystals
Diamond deposits
Diamonds
Geochronology
Lead
Minerals
Shellfish
Zircon
Tectonics
Albian
Aptian
diamond
geochronology
kimberlite
mantle source
metasomatism
mineral exploration
SHRIMP dating
uranium-lead dating
zircon
Angola
Decapoda (Crustacea)
Robles-Cruz, S.E.
Escayola, M.
Jackson, S.
Galí, S.
Pervov, V.
Watangua, M.
Gonçalves, A.
Melgarejo, J.C.
U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration
topic_facet Catoca kimberlite
Diamond
Geochronology
SHRIMP
U-Pb dating
Zircon
Age determination
Catoca kimberlite
Diamond exploration
Early Cretaceous
Kimberlite body
Mantle source
Mean square
Regional tectonics
Sedimentary units
Sensitive high-resolution ion microprobe
SHRIMP
South Atlantic
Tectonic settings
U-Pb ages
U-Pb dating
U-Pb SHRIMP
Weighted mean
Zircon crystals
Diamond deposits
Diamonds
Geochronology
Lead
Minerals
Shellfish
Zircon
Tectonics
Albian
Aptian
diamond
geochronology
kimberlite
mantle source
metasomatism
mineral exploration
SHRIMP dating
uranium-lead dating
zircon
Angola
Decapoda (Crustacea)
description We present the first age determinations of zircon from the diamondiferous Catoca kimberlite in northeastern Angola, the fourth largest kimberlite body in the world. The U-Pb ages were obtained using a Sensitive High Resolution Ion Microprobe II (SHRIMP II) on zircon crystals derived from tuffisitic kimberlite rocks and heavy-mineral concentrates from the Catoca kimberlite. The SHRIMP results define a single weighted mean age of 117.9. ± 0.7 Ma (Mean square weighted deviation MSWD = 1.3). More than 90% of the results indicate a single age population. There is no evidence for variable ages within single crystals, and no diffusional profiles are preserved. These data are interpreted as the maximum age of the kimberlite eruption at Catoca. The U/Th values suggest at least two different sources of zircon crystals. These different populations may reflect different sources of kimberlitic magma, with some of the grains produced in U- and Th-enriched metasomatized mantle units. This idea is consistent with the two populations of zircon identified in this study. One population originated from a depleted mantle source with low total REE (less than 25. ppm), and the other was derived from an enriched source, likely from the mantle or a carbonatite-like melt with high total REE (up to 123. ppm).The tectonic setting of northeastern Angola is influenced by the opening of the south Atlantic, which reactivated deep NE-SW-trending faults during the early Cretaceous. The eruption of the Catoca kimberlite can be correlated with these regional tectonic events. The Calonda Formation (Albian-Cenomanian age) is the earliest sedimentary unit that incorporates eroded material derived from the diamondiferous kimberlites. Thus, the age of the Catoca kimberlite eruption is restricted to the time between the middle of the Aptian and the Albian. The new interpretation will be an important guide in future exploration for diamonds because it provides precise data on the age of a diamond-bearing kimberlite pulse in Angola. © 2012 Elsevier B.V.
format JOUR
author Robles-Cruz, S.E.
Escayola, M.
Jackson, S.
Galí, S.
Pervov, V.
Watangua, M.
Gonçalves, A.
Melgarejo, J.C.
author_facet Robles-Cruz, S.E.
Escayola, M.
Jackson, S.
Galí, S.
Pervov, V.
Watangua, M.
Gonçalves, A.
Melgarejo, J.C.
author_sort Robles-Cruz, S.E.
title U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration
title_short U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration
title_full U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration
title_fullStr U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration
title_full_unstemmed U-Pb SHRIMP geochronology of zircon from the Catoca kimberlite, Angola: Implications for diamond exploration
title_sort u-pb shrimp geochronology of zircon from the catoca kimberlite, angola: implications for diamond exploration
url http://hdl.handle.net/20.500.12110/paper_00092541_v310-311_n_p137_RoblesCruz
work_keys_str_mv AT roblescruzse upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT escayolam upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT jacksons upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT galis upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT pervovv upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT watanguam upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT goncalvesa upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
AT melgarejojc upbshrimpgeochronologyofzirconfromthecatocakimberliteangolaimplicationsfordiamondexploration
_version_ 1807324107895734272

Ejemplares similares