A new 1.9 Ga age for the Trompsburg intrusion, South Africa

Wolfgang Maier; P. Peltonen; G. Grantham; I. Manttari

doi:10.1016/S0012-821X(03)00281-4

A new 1.9 Ga age for the Trompsburg intrusion, South Africa

Wolfgang Maier, P. Peltonen, G. Grantham, I. Manttari

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15 Citations (Scopus)

Abstract

The Trompsburg intrusion of South Africa is a large layered intrusion, measuring approximately 2500 km(2). Little is known about its age and composition. Boreholes drilled in the 1940s to constrain a strong gravimetric and magnetic anomaly intersected up to 2 km of gabbro-troctolite-anorthosite containing up to 19 massive magnetite layers. Sr isotopic analyses performed in 1970 indicated an age of 1372+/-142 Ma for the intrusion, suggesting no direct genetic link to the 2054 Ma Bushveld Complex. No further work was conducted on the Trompsburg intrusion during the last decades. Our results for a secondary ion mass spectrometry U/Pb isotope study on zircons from two gabbroic samples of the Trompsburg intrusion indicate a crystallisation age of 1915+/-6 Ma, supporting the occurrence of a global 1.9 Ga superplume event. Using the new age, we recalculated available Sr isotope data. The results suggest that the Trompsburg intrusion has a lower crustal component than the Bushveld Complex, with Sr-i approximately 0.704. A genetic relationship between the Trompsburg and Bushveld intrusions remains, therefore, unlikely. (C) 2003 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	351-360
Journal	Earth and Planetary Science Letters
Volume	212
Issue number	3-4
DOIs	https://doi.org/10.1016/S0012-821X(03)00281-4
Publication status	Published - 2003

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Maier, W., Peltonen, P., Grantham, G., & Manttari, I. (2003). A new 1.9 Ga age for the Trompsburg intrusion, South Africa. Earth and Planetary Science Letters, 212(3-4), 351-360. https://doi.org/10.1016/S0012-821X(03)00281-4

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title = "A new 1.9 Ga age for the Trompsburg intrusion, South Africa",

abstract = "The Trompsburg intrusion of South Africa is a large layered intrusion, measuring approximately 2500 km(2). Little is known about its age and composition. Boreholes drilled in the 1940s to constrain a strong gravimetric and magnetic anomaly intersected up to 2 km of gabbro-troctolite-anorthosite containing up to 19 massive magnetite layers. Sr isotopic analyses performed in 1970 indicated an age of 1372+/-142 Ma for the intrusion, suggesting no direct genetic link to the 2054 Ma Bushveld Complex. No further work was conducted on the Trompsburg intrusion during the last decades. Our results for a secondary ion mass spectrometry U/Pb isotope study on zircons from two gabbroic samples of the Trompsburg intrusion indicate a crystallisation age of 1915+/-6 Ma, supporting the occurrence of a global 1.9 Ga superplume event. Using the new age, we recalculated available Sr isotope data. The results suggest that the Trompsburg intrusion has a lower crustal component than the Bushveld Complex, with Sr-i approximately 0.704. A genetic relationship between the Trompsburg and Bushveld intrusions remains, therefore, unlikely. (C) 2003 Elsevier Science B.V. All rights reserved.",

author = "Wolfgang Maier and P. Peltonen and G. Grantham and I. Manttari",

year = "2003",

doi = "10.1016/S0012-821X(03)00281-4",

language = "English",

volume = "212",

pages = "351--360",

journal = "Earth & Planetary Science Letters",

issn = "0012-821X",

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TY - JOUR

T1 - A new 1.9 Ga age for the Trompsburg intrusion, South Africa

AU - Maier, Wolfgang

AU - Peltonen, P.

AU - Grantham, G.

AU - Manttari, I.

PY - 2003

Y1 - 2003

N2 - The Trompsburg intrusion of South Africa is a large layered intrusion, measuring approximately 2500 km(2). Little is known about its age and composition. Boreholes drilled in the 1940s to constrain a strong gravimetric and magnetic anomaly intersected up to 2 km of gabbro-troctolite-anorthosite containing up to 19 massive magnetite layers. Sr isotopic analyses performed in 1970 indicated an age of 1372+/-142 Ma for the intrusion, suggesting no direct genetic link to the 2054 Ma Bushveld Complex. No further work was conducted on the Trompsburg intrusion during the last decades. Our results for a secondary ion mass spectrometry U/Pb isotope study on zircons from two gabbroic samples of the Trompsburg intrusion indicate a crystallisation age of 1915+/-6 Ma, supporting the occurrence of a global 1.9 Ga superplume event. Using the new age, we recalculated available Sr isotope data. The results suggest that the Trompsburg intrusion has a lower crustal component than the Bushveld Complex, with Sr-i approximately 0.704. A genetic relationship between the Trompsburg and Bushveld intrusions remains, therefore, unlikely. (C) 2003 Elsevier Science B.V. All rights reserved.

AB - The Trompsburg intrusion of South Africa is a large layered intrusion, measuring approximately 2500 km(2). Little is known about its age and composition. Boreholes drilled in the 1940s to constrain a strong gravimetric and magnetic anomaly intersected up to 2 km of gabbro-troctolite-anorthosite containing up to 19 massive magnetite layers. Sr isotopic analyses performed in 1970 indicated an age of 1372+/-142 Ma for the intrusion, suggesting no direct genetic link to the 2054 Ma Bushveld Complex. No further work was conducted on the Trompsburg intrusion during the last decades. Our results for a secondary ion mass spectrometry U/Pb isotope study on zircons from two gabbroic samples of the Trompsburg intrusion indicate a crystallisation age of 1915+/-6 Ma, supporting the occurrence of a global 1.9 Ga superplume event. Using the new age, we recalculated available Sr isotope data. The results suggest that the Trompsburg intrusion has a lower crustal component than the Bushveld Complex, with Sr-i approximately 0.704. A genetic relationship between the Trompsburg and Bushveld intrusions remains, therefore, unlikely. (C) 2003 Elsevier Science B.V. All rights reserved.

U2 - 10.1016/S0012-821X(03)00281-4

DO - 10.1016/S0012-821X(03)00281-4

M3 - Article

VL - 212

SP - 351

EP - 360

JO - Earth & Planetary Science Letters

JF - Earth & Planetary Science Letters

SN - 0012-821X

IS - 3-4

ER -

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10.1016/S0012-821X(03)00281-4