A 3.5 Ga granite-gneiss basement in Guinea: Further evidence for early Archean accretion within the West African Craton

Denis Thiéblemont; Claude Delor; Alain Cocherie; Jean Michel Lafon; Jean Christian Goujou; Alhassane Baldé; Mamadou Bah; Hadi Sané; C. Mark Fanning

doi:10.1016/S0301-9268(00)00160-1

A 3.5 Ga granite-gneiss basement in Guinea: Further evidence for early Archean accretion within the West African Craton

Denis Thiéblemont^*, Claude Delor, Alain Cocherie, Jean Michel Lafon, Jean Christian Goujou, Alhassane Baldé, Mamadou Bah, Hadi Sané, C. Mark Fanning

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

61 Citations (Scopus)

Abstract

A granite-gneiss formation (Guélémata Orthogneiss) was mapped on the northern and western slopes of the Mount Nimba hill range in Guinea. The original rocks were high-Al, low-Yb, medium to high-K granites similar to most Archean TTG. Analyses of U and Pb isotopes in zircons, using an ion-microprobe (SHRIMP), gave ages of 3542 and 3535 Ma respectively for the granite-gneiss and a neighbouring granulitic metagabbro. These are the oldest ages so far reported from the Archean Kenema-Man domain of West Africa. Partial melting of an unfractionated basalt under eclogite facies conditions appears to be a suitable model for the origin of the granite-gneiss.

Original language	English
Pages (from-to)	179-194
Number of pages	16
Journal	Precambrian Research
Volume	108
Issue number	3-4
DOIs	https://doi.org/10.1016/S0301-9268(00)00160-1
Publication status	Published - 1 Jun 2001

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title = "A 3.5 Ga granite-gneiss basement in Guinea: Further evidence for early Archean accretion within the West African Craton",

abstract = "A granite-gneiss formation (Gu{\'e}l{\'e}mata Orthogneiss) was mapped on the northern and western slopes of the Mount Nimba hill range in Guinea. The original rocks were high-Al, low-Yb, medium to high-K granites similar to most Archean TTG. Analyses of U and Pb isotopes in zircons, using an ion-microprobe (SHRIMP), gave ages of 3542 and 3535 Ma respectively for the granite-gneiss and a neighbouring granulitic metagabbro. These are the oldest ages so far reported from the Archean Kenema-Man domain of West Africa. Partial melting of an unfractionated basalt under eclogite facies conditions appears to be a suitable model for the origin of the granite-gneiss.",

keywords = "Crustal accretion, Early Archean, Guinea, Kenema-Man domain, West African Craton",

author = "Denis Thi{\'e}blemont and Claude Delor and Alain Cocherie and Lafon, {Jean Michel} and Goujou, {Jean Christian} and Alhassane Bald{\'e} and Mamadou Bah and Hadi San{\'e} and {Mark Fanning}, C.",

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doi = "10.1016/S0301-9268(00)00160-1",

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T1 - A 3.5 Ga granite-gneiss basement in Guinea

T2 - Further evidence for early Archean accretion within the West African Craton

AU - Thiéblemont, Denis

AU - Delor, Claude

AU - Cocherie, Alain

AU - Lafon, Jean Michel

AU - Goujou, Jean Christian

AU - Baldé, Alhassane

AU - Bah, Mamadou

AU - Sané, Hadi

AU - Mark Fanning, C.

PY - 2001/6/1

Y1 - 2001/6/1

N2 - A granite-gneiss formation (Guélémata Orthogneiss) was mapped on the northern and western slopes of the Mount Nimba hill range in Guinea. The original rocks were high-Al, low-Yb, medium to high-K granites similar to most Archean TTG. Analyses of U and Pb isotopes in zircons, using an ion-microprobe (SHRIMP), gave ages of 3542 and 3535 Ma respectively for the granite-gneiss and a neighbouring granulitic metagabbro. These are the oldest ages so far reported from the Archean Kenema-Man domain of West Africa. Partial melting of an unfractionated basalt under eclogite facies conditions appears to be a suitable model for the origin of the granite-gneiss.

AB - A granite-gneiss formation (Guélémata Orthogneiss) was mapped on the northern and western slopes of the Mount Nimba hill range in Guinea. The original rocks were high-Al, low-Yb, medium to high-K granites similar to most Archean TTG. Analyses of U and Pb isotopes in zircons, using an ion-microprobe (SHRIMP), gave ages of 3542 and 3535 Ma respectively for the granite-gneiss and a neighbouring granulitic metagabbro. These are the oldest ages so far reported from the Archean Kenema-Man domain of West Africa. Partial melting of an unfractionated basalt under eclogite facies conditions appears to be a suitable model for the origin of the granite-gneiss.

KW - Crustal accretion

KW - Early Archean

KW - Guinea

KW - Kenema-Man domain

KW - West African Craton

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DO - 10.1016/S0301-9268(00)00160-1

M3 - Article

SN - 0301-9268

VL - 108

SP - 179

EP - 194

JO - Precambrian Research

JF - Precambrian Research

IS - 3-4

ER -

A 3.5 Ga granite-gneiss basement in Guinea: Further evidence for early Archean accretion within the West African Craton

Abstract

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