Abstract
Accepted models suggest that the c. 1.21 to 1.02 Ga Margate Terrane is one of three volcanic arc-like terranes that form the Natal Metamorphic Province in South Africa. Integration of new and compiled geological mapping and whole rock geochemical data, however, shows that ∼83% of bedrock exposure of the Margate Terrane is formed of ferroan to magnesian alkali-calcic granites that are more typical of petrogenesis within thick continental-like crust. Prominent negative Nb and Ti anomalies, as well as relatively low Sr., furthermore suggest petrogenesis above a subduction zone and/or derivation from juvenile volcanic arc-related rocks. Exposures of volcanic arc-like lithologies, on the other hand, comprise just ∼9% of all bedrock in the Margate Terrane and only ∼2% the granitoids. An alternative interpretation is therefore presented that suggests most of the "Margate Terrane" is in fact a ∼1.09 to 1.02 Ga granitic batholith.
| Original language | English |
|---|---|
| Pages (from-to) | 47-64 |
| Number of pages | 18 |
| Journal | South African Journal of Geology |
| Volume | 115 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 1 2012 |
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All Science Journal Classification (ASJC) codes
- Geology
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Granitoids from the Margate Terrane and their implications for tectono-magmatic models of the natal metamorphic province (South Africa). / Voordouw, R. J.; Rajesh, H. M.
In: South African Journal of Geology, Vol. 115, No. 1, 01.03.2012, p. 47-64.Research output: Contribution to journal › Article
TY - JOUR
T1 - Granitoids from the Margate Terrane and their implications for tectono-magmatic models of the natal metamorphic province (South Africa)
AU - Voordouw, R. J.
AU - Rajesh, H. M.
PY - 2012/3/1
Y1 - 2012/3/1
N2 - Accepted models suggest that the c. 1.21 to 1.02 Ga Margate Terrane is one of three volcanic arc-like terranes that form the Natal Metamorphic Province in South Africa. Integration of new and compiled geological mapping and whole rock geochemical data, however, shows that ∼83% of bedrock exposure of the Margate Terrane is formed of ferroan to magnesian alkali-calcic granites that are more typical of petrogenesis within thick continental-like crust. Prominent negative Nb and Ti anomalies, as well as relatively low Sr., furthermore suggest petrogenesis above a subduction zone and/or derivation from juvenile volcanic arc-related rocks. Exposures of volcanic arc-like lithologies, on the other hand, comprise just ∼9% of all bedrock in the Margate Terrane and only ∼2% the granitoids. An alternative interpretation is therefore presented that suggests most of the "Margate Terrane" is in fact a ∼1.09 to 1.02 Ga granitic batholith.
AB - Accepted models suggest that the c. 1.21 to 1.02 Ga Margate Terrane is one of three volcanic arc-like terranes that form the Natal Metamorphic Province in South Africa. Integration of new and compiled geological mapping and whole rock geochemical data, however, shows that ∼83% of bedrock exposure of the Margate Terrane is formed of ferroan to magnesian alkali-calcic granites that are more typical of petrogenesis within thick continental-like crust. Prominent negative Nb and Ti anomalies, as well as relatively low Sr., furthermore suggest petrogenesis above a subduction zone and/or derivation from juvenile volcanic arc-related rocks. Exposures of volcanic arc-like lithologies, on the other hand, comprise just ∼9% of all bedrock in the Margate Terrane and only ∼2% the granitoids. An alternative interpretation is therefore presented that suggests most of the "Margate Terrane" is in fact a ∼1.09 to 1.02 Ga granitic batholith.
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U2 - 10.2113/gssajg.115.1.47
DO - 10.2113/gssajg.115.1.47
M3 - Article
VL - 115
SP - 47
EP - 64
JO - South African Journal of Geology
JF - South African Journal of Geology
SN - 1012-0750
IS - 1
ER -