Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen

Ndong Bidzang Francois; Ntomba Sylvestre Martial; Ntomb Yvan Demonstel; Messi Ottou Eric Jose; Magnekou Takamte Rufine Christelle

doi:doi:10.11648/j.sr.20190702.12

Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen

Ndong Bidzang Francois, Ntomba Sylvestre Martial, Ntomb Yvan Demonstel, Messi Ottou Eric Jose, Magnekou Takamte Rufine Christelle

Published in Science Research (Volume 7, Issue 2)

Received: 5 August 2019 Accepted: 4 September 2019 Published: 19 September 2019

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Abstract

The Ngovayang trondhjemitic gneisses belong to the Nyong Complex at the Northwest boundary of the Ntem Complex. A combined study of whole-rock major, trace elements and isotopic data, Sm-Nd and Rb-Sr indicate that trondhjemitic gneisses are peraluminous and range from weakly I-type to S-type with nearly constant A/CNK values between 1.04 and 1.24. Their I- and S- type characters suggest that juvenile materials have been partially remobilized or recycled. These trondhjemitic gneisses have slightly to moderate MgO, Cr and Ni contents, ISr (0.703677 - 0.741911) and low εNd(t) (from -16.48 to -10.6) values. Such geochemical features suggest a small mantle-source contribution, coupled with assimilation of some upper and lower crustal materials and indicate the implication of old crust probably with both Archean and Early eburnean origin (2597 - 2318 Ma). They also exhibit geochemical features typical of calc-alkaline, crustal contaminated calcalkaline rocks, volcanic arc and trondhjemitic nature. These results show that old crust has recycled and trondhjemitic gneisses are linked to convergent geodynamic system. The petrogenetic diagrams of AFM vs CFM, MgO vs SiO₂ and Rb/Ba vs Rb/Sr and lower K₂O/Na₂O ratio values (0.38-0.51), indicate that the magmatic source materials are mainly composed of plagioclase-rich sources such as metagreywackes - metabasic mixtures, metagreywackes and metabasics and basalt or igneous rocks. These sources materials occurring in the melt originated from both slab melting and assimilation of upper and lower crust at ca. 732.4 - 928.7°C and at 2597 - 2318 Ma. This study shows that Archean crust may have a North-West extension beyond the actual boundary with Nyong Complex.

Published in	Science Research (Volume 7, Issue 2)
DOI	10.11648/j.sr.20190702.12
Page(s)	17-32
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2019. Published by Science Publishing Group

Keywords

Nyong Complex, Ngovayang Trondhjemitic Gneisses, Sm-Nd and Rb-Sr Datings, Thermometry, Convergent Geodynamic System

References

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Ndong Bidzang Francois, Ntomba Sylvestre Martial, Ntomb Yvan Demonstel, Messi Ottou Eric Jose, Magnekou Takamte Rufine Christelle. (2019). Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen. Science Research, 7(2), 17-32. https://doi.org/10.11648/j.sr.20190702.12

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Ndong Bidzang Francois; Ntomba Sylvestre Martial; Ntomb Yvan Demonstel; Messi Ottou Eric Jose; Magnekou Takamte Rufine Christelle. Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen. Sci. Res. 2019, 7(2), 17-32. doi: 10.11648/j.sr.20190702.12

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Ndong Bidzang Francois, Ntomba Sylvestre Martial, Ntomb Yvan Demonstel, Messi Ottou Eric Jose, Magnekou Takamte Rufine Christelle. Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen. Sci Res. 2019;7(2):17-32. doi: 10.11648/j.sr.20190702.12

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@article{10.11648/j.sr.20190702.12,
  author = {Ndong Bidzang Francois and Ntomba Sylvestre Martial and Ntomb Yvan Demonstel and Messi Ottou Eric Jose and Magnekou Takamte Rufine Christelle},
  title = {Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen},
  journal = {Science Research},
  volume = {7},
  number = {2},
  pages = {17-32},
  doi = {10.11648/j.sr.20190702.12},
  url = {https://doi.org/10.11648/j.sr.20190702.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sr.20190702.12},
  abstract = {The Ngovayang trondhjemitic gneisses belong to the Nyong Complex at the Northwest boundary of the Ntem Complex. A combined study of whole-rock major, trace elements and isotopic data, Sm-Nd and Rb-Sr indicate that trondhjemitic gneisses are peraluminous and range from weakly I-type to S-type with nearly constant A/CNK values between 1.04 and 1.24. Their I- and S- type characters suggest that juvenile materials have been partially remobilized or recycled. These trondhjemitic gneisses have slightly to moderate MgO, Cr and Ni contents, ISr (0.703677 - 0.741911) and low εNd(t) (from -16.48 to -10.6) values. Such geochemical features suggest a small mantle-source contribution, coupled with assimilation of some upper and lower crustal materials and indicate the implication of old crust probably with both Archean and Early eburnean origin (2597 - 2318 Ma). They also exhibit geochemical features typical of calc-alkaline, crustal contaminated calcalkaline rocks, volcanic arc and trondhjemitic nature. These results show that old crust has recycled and trondhjemitic gneisses are linked to convergent geodynamic system. The petrogenetic diagrams of AFM vs CFM, MgO vs SiO2 and Rb/Ba vs Rb/Sr and lower K2O/Na2O ratio values (0.38-0.51), indicate that the magmatic source materials are mainly composed of plagioclase-rich sources such as metagreywackes - metabasic mixtures, metagreywackes and metabasics and basalt or igneous rocks. These sources materials occurring in the melt originated from both slab melting and assimilation of upper and lower crust at ca. 732.4 - 928.7°C and at 2597 - 2318 Ma. This study shows that Archean crust may have a North-West extension beyond the actual boundary with Nyong Complex.},
 year = {2019}
}

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TY  - JOUR
T1  - Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen
AU  - Ndong Bidzang Francois
AU  - Ntomba Sylvestre Martial
AU  - Ntomb Yvan Demonstel
AU  - Messi Ottou Eric Jose
AU  - Magnekou Takamte Rufine Christelle
Y1  - 2019/09/19
PY  - 2019
N1  - https://doi.org/10.11648/j.sr.20190702.12
DO  - 10.11648/j.sr.20190702.12
T2  - Science Research
JF  - Science Research
JO  - Science Research
SP  - 17
EP  - 32
PB  - Science Publishing Group
SN  - 2329-0927
UR  - https://doi.org/10.11648/j.sr.20190702.12
AB  - The Ngovayang trondhjemitic gneisses belong to the Nyong Complex at the Northwest boundary of the Ntem Complex. A combined study of whole-rock major, trace elements and isotopic data, Sm-Nd and Rb-Sr indicate that trondhjemitic gneisses are peraluminous and range from weakly I-type to S-type with nearly constant A/CNK values between 1.04 and 1.24. Their I- and S- type characters suggest that juvenile materials have been partially remobilized or recycled. These trondhjemitic gneisses have slightly to moderate MgO, Cr and Ni contents, ISr (0.703677 - 0.741911) and low εNd(t) (from -16.48 to -10.6) values. Such geochemical features suggest a small mantle-source contribution, coupled with assimilation of some upper and lower crustal materials and indicate the implication of old crust probably with both Archean and Early eburnean origin (2597 - 2318 Ma). They also exhibit geochemical features typical of calc-alkaline, crustal contaminated calcalkaline rocks, volcanic arc and trondhjemitic nature. These results show that old crust has recycled and trondhjemitic gneisses are linked to convergent geodynamic system. The petrogenetic diagrams of AFM vs CFM, MgO vs SiO2 and Rb/Ba vs Rb/Sr and lower K2O/Na2O ratio values (0.38-0.51), indicate that the magmatic source materials are mainly composed of plagioclase-rich sources such as metagreywackes - metabasic mixtures, metagreywackes and metabasics and basalt or igneous rocks. These sources materials occurring in the melt originated from both slab melting and assimilation of upper and lower crust at ca. 732.4 - 928.7°C and at 2597 - 2318 Ma. This study shows that Archean crust may have a North-West extension beyond the actual boundary with Nyong Complex.
VL  - 7
IS  - 2
ER  -

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Author Information

Ndong Bidzang Francois

Ore Processing Laboratory, Institute for Geological and Mining Research, Yaounde, Cameroon
Ntomba Sylvestre Martial

Centre for Geological and Mining Research, Institute for Geological and Mining Research, Yaounde, Cameroon
Ntomb Yvan Demonstel

Centre for Geological and Mining Research, Institute for Geological and Mining Research, Yaounde, Cameroon
Messi Ottou Eric Jose

Department of Earth Sciences, University of Yaounde I, Yaounde, Cameroon
Magnekou Takamte Rufine Christelle

Department of Earth Sciences, University of Yaounde I, Yaounde, Cameroon

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Ndong Bidzang Francois, Ntomba Sylvestre Martial, Ntomb Yvan Demonstel, Messi Ottou Eric Jose, Magnekou Takamte Rufine Christelle. (2019). Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen. Science Research, 7(2), 17-32. https://doi.org/10.11648/j.sr.20190702.12

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Ndong Bidzang Francois; Ntomba Sylvestre Martial; Ntomb Yvan Demonstel; Messi Ottou Eric Jose; Magnekou Takamte Rufine Christelle. Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen. Sci. Res. 2019, 7(2), 17-32. doi: 10.11648/j.sr.20190702.12

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Ndong Bidzang Francois, Ntomba Sylvestre Martial, Ntomb Yvan Demonstel, Messi Ottou Eric Jose, Magnekou Takamte Rufine Christelle. Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen. Sci Res. 2019;7(2):17-32. doi: 10.11648/j.sr.20190702.12

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@article{10.11648/j.sr.20190702.12,
  author = {Ndong Bidzang Francois and Ntomba Sylvestre Martial and Ntomb Yvan Demonstel and Messi Ottou Eric Jose and Magnekou Takamte Rufine Christelle},
  title = {Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen},
  journal = {Science Research},
  volume = {7},
  number = {2},
  pages = {17-32},
  doi = {10.11648/j.sr.20190702.12},
  url = {https://doi.org/10.11648/j.sr.20190702.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.sr.20190702.12},
  abstract = {The Ngovayang trondhjemitic gneisses belong to the Nyong Complex at the Northwest boundary of the Ntem Complex. A combined study of whole-rock major, trace elements and isotopic data, Sm-Nd and Rb-Sr indicate that trondhjemitic gneisses are peraluminous and range from weakly I-type to S-type with nearly constant A/CNK values between 1.04 and 1.24. Their I- and S- type characters suggest that juvenile materials have been partially remobilized or recycled. These trondhjemitic gneisses have slightly to moderate MgO, Cr and Ni contents, ISr (0.703677 - 0.741911) and low εNd(t) (from -16.48 to -10.6) values. Such geochemical features suggest a small mantle-source contribution, coupled with assimilation of some upper and lower crustal materials and indicate the implication of old crust probably with both Archean and Early eburnean origin (2597 - 2318 Ma). They also exhibit geochemical features typical of calc-alkaline, crustal contaminated calcalkaline rocks, volcanic arc and trondhjemitic nature. These results show that old crust has recycled and trondhjemitic gneisses are linked to convergent geodynamic system. The petrogenetic diagrams of AFM vs CFM, MgO vs SiO2 and Rb/Ba vs Rb/Sr and lower K2O/Na2O ratio values (0.38-0.51), indicate that the magmatic source materials are mainly composed of plagioclase-rich sources such as metagreywackes - metabasic mixtures, metagreywackes and metabasics and basalt or igneous rocks. These sources materials occurring in the melt originated from both slab melting and assimilation of upper and lower crust at ca. 732.4 - 928.7°C and at 2597 - 2318 Ma. This study shows that Archean crust may have a North-West extension beyond the actual boundary with Nyong Complex.},
 year = {2019}
}

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TY  - JOUR
T1  - Sm-Nd and Rb-Sr Datings, Petrogenesis and Thermometry of the Ngovayang Area (South-West Cameroon): Isotopic Data Insight of Recycling Crust and Convergence Orogen
AU  - Ndong Bidzang Francois
AU  - Ntomba Sylvestre Martial
AU  - Ntomb Yvan Demonstel
AU  - Messi Ottou Eric Jose
AU  - Magnekou Takamte Rufine Christelle
Y1  - 2019/09/19
PY  - 2019
N1  - https://doi.org/10.11648/j.sr.20190702.12
DO  - 10.11648/j.sr.20190702.12
T2  - Science Research
JF  - Science Research
JO  - Science Research
SP  - 17
EP  - 32
PB  - Science Publishing Group
SN  - 2329-0927
UR  - https://doi.org/10.11648/j.sr.20190702.12
AB  - The Ngovayang trondhjemitic gneisses belong to the Nyong Complex at the Northwest boundary of the Ntem Complex. A combined study of whole-rock major, trace elements and isotopic data, Sm-Nd and Rb-Sr indicate that trondhjemitic gneisses are peraluminous and range from weakly I-type to S-type with nearly constant A/CNK values between 1.04 and 1.24. Their I- and S- type characters suggest that juvenile materials have been partially remobilized or recycled. These trondhjemitic gneisses have slightly to moderate MgO, Cr and Ni contents, ISr (0.703677 - 0.741911) and low εNd(t) (from -16.48 to -10.6) values. Such geochemical features suggest a small mantle-source contribution, coupled with assimilation of some upper and lower crustal materials and indicate the implication of old crust probably with both Archean and Early eburnean origin (2597 - 2318 Ma). They also exhibit geochemical features typical of calc-alkaline, crustal contaminated calcalkaline rocks, volcanic arc and trondhjemitic nature. These results show that old crust has recycled and trondhjemitic gneisses are linked to convergent geodynamic system. The petrogenetic diagrams of AFM vs CFM, MgO vs SiO2 and Rb/Ba vs Rb/Sr and lower K2O/Na2O ratio values (0.38-0.51), indicate that the magmatic source materials are mainly composed of plagioclase-rich sources such as metagreywackes - metabasic mixtures, metagreywackes and metabasics and basalt or igneous rocks. These sources materials occurring in the melt originated from both slab melting and assimilation of upper and lower crust at ca. 732.4 - 928.7°C and at 2597 - 2318 Ma. This study shows that Archean crust may have a North-West extension beyond the actual boundary with Nyong Complex.
VL  - 7
IS  - 2
ER  -

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