Electron microprobe dating and thermobarometry of neoproterozoic metamorphic events in the Kekem area, Central African Fold Belt of Cameroon

Neues Jahrbuch fur Mineralogie, Abhandlungen

Volumn 186, Issue 1, 2009, Pages 95-109

  Tchato, Depesquidoux Tchaptchet ^a   Schulz, Bernhard ^b   Nzenti, Jean Paul ^b  

^a UNIVERSITY OF YAOUNDÉ I   (Cameroon)

^b TU BERGAKADEMIE FREIBERG   (Germany)

Author keywords

Cameroon; Central African Fold Belt; Collisional crustal thickening; EMP monazite dating; HT metamorphic event; Mylonitisation; Pan African

Indexed keywords

AMPHIBOLITE FACIES; CRUSTAL THICKENING; ELECTRON PROBE ANALYSIS; GEOBAROMETRY; GNEISS; MONAZITE; MYLONITIZATION; P-T CONDITIONS; PROTEROZOIC; SILLIMANITE; ULTRAHIGH TEMPERATURE METAMORPHISM; URANIUM-LEAD DATING;

CAMEROON;

EID: 76249098685     PISSN: 00777757     EISSN: None     Source Type: Journal    
DOI: 10.1127/0077-7757/2009/0140     Document Type: Article

References (74)

1. BELL, T. M. & WELCH, P. W. (2002): Prolonged Acadian orogenesis: revelations from foliation intersection axis (FIA) controlled monazite dating of foliations in porphyroblasts and matrix. -Am. J Sci. 302: 549-581.
2. BHATTACHARYA, A., MOHANTY, L., MAJI, A., SEN, S. K. & RAITH, M. (1992): Non-ideal mixing in the phlogopite-annite binary: constraints from experimental data on Fe-Mg partitioning and a reformulation of the garnet-biotite geothermometer. - Contrib. Mineral. Petrol. 111: 87-93.
3. BRAUN, I., APPEL, P. & PAQUETTE, J.-L. (2005): Polyphase Neoproterozoic high-grade metamorphism in the Southern Granulite Terrain of India: implications from Th-U-Pb dating of monazite. - Geophys. Res. Abstr. 7, 08152, EGU 2005.
4. CABY, R., SIAL, A. N., ARTHAUD, M. & VAUCHEZ, A. (1991): Crustal evolution and the Brasiliano orogeny in northeast Brazil. - In: DALLMEYER, R. D. & LÉCORCHÉ, J P. (eds.): The west African orogens and circum-Atlantic correlatives, 373-397, Springer- Verlag.
5. CASTAING, C, FEYBESSE, J. L., THIEBLEMONT, D., TRIBOULET, C. & CHEVREMONT, P. (1994): Paleogeographical reconstructions of the Pan-African/Brasiliano orogen: closure of an oceanic domain or intracontinental convergence between major blocks. - Precambrian Res. 69: 327-344.
6. CHERNIAK, D. J., WATSON, E. B., GROVE, M. & HARRISON, T. M. (2004): Pb diffusion in monazite: A combined RBS/SIMS study. - Geochim. Cosmochim. Acta 68: 829-840.
7. COCHERIE, A., LEGENDRE, O., PEUCAT, J. J. & KOUMELAN, A. N. (1998): Geochronology of polygenetic monazites constrained by in-situ microprobe Th-U-total lead determination: implications for lead behaviour in monazite. - Geochim. Cosmochim. Acta 62: 2475-2497.
8. DAHL, P. S., TERRY, M. P., JERCINOVIC, M. J., WILLIAMS, M. L., HAMILTON, M. A., FOLAND, K. A., CLEMENT, S. M. & FRIBERG, L. M. (2005): Electron probe (Ultrachron) microchronometry of metamorphic monazite: Unraveling the timing of polyphase thermotectonism in the easternmost Wyoming Craton (Black Hills, South Dakota). - Am. Mineral. 90: 1712-1728.
9. DJOUKA-FONKWE, M. L, SCHULZ, B., SCHÜSSLER, U., TCHOUANKOUE, J.-P. & NZOLANG, C. (2008): Geochemistry of the Bafoussam Pan-African I- and S-type granitoids in western Cameroon. -J. Afr. Earth Sci. 50: 148-167.
10. DONOVAN, J. J., HANCHAR, J. M., PICOLLI, P. M., SCHRIER, M. D., BOATNER, L. A. & JAROSEWICH, E. (2003): A re-examination of the rare-earth-element orthophosphate standards in use for electron-microprobe analysis. - Can. Mineral. 41: 221-232.
11. DUMORT, J. C. (1968): Notice explicative de la carte géologique de reconnaissance du Cameroun au 1/500 000. Feuille Douala Ouest. - Direction des Mines et Géologie du Cameroun, 69 pp.
12. FINGER, F. & HELMY, H. M. (1998): Composition and total-Pb model ages of monazite from high-grade paragneisses in the Abu Swayel area, southern Eastern Desert, Egypt. - Mineral. Petrol. 62: 269-289.
13. FINGER, F. & KRENN, E. (2007): Three metamorphic monazite generations in a high-pressure rock from the Bohemian Massif and the potentially important role of apatite in stimulating polyphase monazite growth along a P-T loop. - Lithos 95: 103-115.
14. FINGER, R, KRENN, E., RIEGLER, G., ROMANO, S. & ZULAUF, G. (2002): Resolving Cambrian, Carboniferous, Permian and Alpine monazite generations in the polymetamorphic basement of eastern Crete (Greece) by means of the electron microprobe. - Terra Nova 14: 233-240.
15. FITZSIMONS, J. C. W., KINNY, P. D., WETHERLEY, S. & HOLLINGSWORTH, D. A. (2005): Bulk chemical control on metamorphic monazite growth in pelitic schists and implications for U-Pb age data. - J Metamorph. Geol. 23: 261-277.
16. FOSTER, G., GIBSON, H. D., PARRISH, R., HORSTWOOD, M., FRASER, J. & TINDLE, A. (2002): Textural, chemical and isotopic insights into the nature and behaviour of metamorphic monazite. - Chem. Geol. 191: 183-207.
17. FRANZ, G., ANDREHS, G. & RHEDE, D. (1996): Crystal chemistry of monazite and xenotime from Saxothuringian-Moldanubian metapelites, NE Bavaria, Germany. - Eur. J Mineral. 8: 1097- 1118.
18. GANGULY, J., CHENG, W. & TIRONE, M. (1996): Thermodynamics of aluminosilicate garnet solid solution: new experimental data, an optimized model, and thermometric applications. - Contrib. Mineral. Petrol. 123: 137-151.
19. GANWA, A., FRISCH, W., SIEBEL, W., SHANG, C. K., MVONDO, O. J., SATIR, M. & TCHAKOUNTE, N. J (2008): Zircon 207Pb-206Pb evaporation ages of Pan-African metasedimentary rocks in the Kombé-Il area (Bafia Group, Cameroon): constraints on protolith age and provenance. - J Afr. Earth Sci. 51: 77-88.
20. HEINRICH, W., ANDREHS, G. & FRANZ, G. (1997): Monazite-xenotime miscibility gap thermometry. I. An empirical calibration. - J Metamorph. Geol. 15: 3-16.
21. HOLDAWAY, M. J (2001): Recalibration of the GASP geobarometer in light of recent garnet and plagioclase activity models and versions of the garnet-biotite geothermometer. - Am. Mineral. 86: 1117-1129.
22. 2. - J. Metamorph. Geol. 8: 89- 124.
23. INDARES, A. (1995): Metamorphic interpretation of high-P-T meapelites with preserved growth zoning in garnet, eastern Gren- ville Province, Canadian Shield. - J Metamorph. Geol. 13: 475-486.
24. JAROSEWICH, E. & BOATNER, L. A. (1991): Rare-earth element reference samples for electron microprobe analysis. - Geostandards Newsletter 15: 397-399.
25. JERCINOVIC, M. J & WILLIAMS, M. L. (2005): Analytical perils (and progress) in electron microprobe trace element analysis applied to geochronology: Background acquisition, interferences, and beam irradiation effects. - Am. Mineral. 90: 526-546.
26. KARABINOS, P. (1984): Polymetamorphic garnet zoning from southeastern Vermont. - Am. J Sci. 284: 1008-1025.
27. KRENN, E. & FINGER, F. (2007): Formation of monazite and rhab- dophane at the expense of allanite during Alpine low temperature retrogression of metapelitic basement rocks from Crete, Greece: Microprobe data and geochronological implications. - Lithos 95: 130-147.
28. LUDWIG, K. R. (2001): Users manual for Isoplot/Ex rev. 2.49. A geochronological toolkit for Microsoft Excel. - Berkeley Geochronology Center Special Publication la: 1-55.
29. MARTIGNOLE, J. & NANTEL, S. (1982): Geothermobarometry of cordierite-bearing metapelites near the Morin anorthosite complex, Grenville province, Quebec. - Can. Mineral. 20: 307- 318.
30. MCFARLANE, C. R. M., CONNELLY, J. N. & CARLSON, W. D. (2006): Contrasting response of monazite and zircon to a high-T thermal overprint. - Lithos 88: 135-149.
31. MONTEL, J.-M., FORET, S., VESCHAMBRE, M., NICOLLET, C. & PROVOST, A. (1996): A fast, reliable, inexpensive in-situ dating technique: Electron microprobe ages on monazite. - Chem. Geol. 131: 37-53.
32. MOTOYOSHI, Y., HOKADA, T. & SHIRAISHI, K. (2006): Electron microprobe (EMP) dating on monazite from Forefinger Point granulites, East Antarctica: implications for Pan-African overprint. - In: FÜTTERER, D. K., DAMASKE, D., KLEINSCHMIDT, G., MILLER, H. & TESSENSOHN, F. (Eds.): Antarctica: Contributions to Global Earth Sciences, 63-68, Springer Verlag.
33. NGAKO, V, JEGOUZO, P. & NZENTI J. P. (1991): Le Cisaillement Centre Camerounais. Rôle structural et géodynamique dans l'orogenése panafricaine. - C. R. Acad. Sci. Paris, 313: 457-463.
34. NGAKO, V, AFFATON, P., NNANGE, J. M. & NJANKO, T. (2003) : Pan-African tectonic evolution in central and southern Cameroon : transpression and transtension during sinistral shear movements. - J Afr. Earth Sci. 36: 207-214.
35. NGNOTUÉ, T., NZENTI, J. P., BARBEY P. & TCHOUA, F. M. (2000): The Ntui Betamba high grade gneisses: a northward extention of the Pan-African Yaoundé gneisses in Cameroon. - J Afr. Earth Sci. 31: 369-381.
36. NGUIESSI, T. C, NZENTI, J. P., NSIFA, E. N., TEMPIER, P. & TCHOUA, F. M. (1997): Les granitoïdes calco-alcalins, syincisaillement de Bandja dans la chaîne panafricaine Nord-Equatoriale au Cameroun. - C. R. Acad. Sci. Paris 325: 95-101.
37. NJONFANG, E., NGAKO, V, MOREAU, CH., AFFATON, P. & DIOT, H. (2008): Restraining bends in high temperature shear zones: The "Central Cameroon Shear Zone", Central Africa. - J Afr. Earth Sci. 52: 9-20.
38. NZENTI, J. P. (1992): Prograde and retrograde garnet zoning at high pressure and temperature in metapelitic and grenatite rocks from Yaounde. - J Afr. Earth Sci. 15: 73-79.
39. NZENTI, J. P. (1998): L'Adamaoua panafricain (région de Banyo): une zone clé pour un modéle de la chaîne panafricaine nordéquatoriale au Cameroun. - Thése Doctorat D'Etat, Université Cheikh Anta Diop (Senegal), Univ. de Nancy I (France) 176 pp.
40. NZENTI, J. P., BARBEY, P., JEGOUZO, P. & MOREAU, C. (1984): Un nouveau exemple de ceinture granulitique dans une chaîne proté- rozoique de collision : les migmatites de Yaoundé au Cameroun. C. R. Acad. Sci. Paris 299: 1197-1199.
41. NZENTI, J. P., BARBEY, P., MACAUDIERE, J. & SOBA, D. (1988): Origin and evolution of the late Precambrian high-grade Yaounde gneisses (Cameroon). - Precambrian Res. 38: 91-109.
42. NZENTI, J. P., BARBEY, P., BERTRAND, J. & MACAUDIERE, J. (1994): La chaîn panafricaine au Cameroun: cherchons suture et modele. -Abstracts 15eme RST, Nancy, Société Géologique France, édit. Paris, p. 99.
43. NZENTI, J. P., NJANKO, T, NJIOSSEU, E. L. T. & TCHOUA, F. M. (1998): Les domaines granulitiques de la chaîne panafricaine Nord-Equatoriale au Cameroun. - In: VICAT, J. P. & BILONG, P. (Eds.): Géologie et environnement au Cameroun, GEOCAM 1: 255-264.
44. NZENTI, J. P., KAPAJIKA, B., WÖRNER, G. & LUBALA, T. R. (2006): Synkinematic emplacement of granitoids in a Pan-African shear zone in Central Cameroon. - J Afr. Earth Sci. 45: 74-86.
45. NZENTI, J. P., NJIOSSEU TANKO, T. E. L. & NZINA NCHARE, A. (2007): The metamorphic evolution of the Paleoproterozoic high grade Banyo gneisses (Adamawa, Cameroon, Central Africa). - J Cam. Acad. Sci. 7: 95-109.
46. NZOLANG, C, KAGAMI, H., NZENTI, J. P. & HOLTZ, F. (2003): Geochemistry and preliminary Sr-Nd isotopic data on the Neoproterozoic granitoids from the Bantoun area, west Cameroon: evidence for a derivation from a Paleoproterozoic to Archean crust. - Polar Geosci. 16: 196-226.
47. PARRISH, R. R. (1990): U-Pb dating of monazite and its application to geological problems. - Can. J Earth Sci. 27: 1431-1450.
48. PASSCHIER, C. & TROUW, R. A. J (1996): Microtectonics. - 289 p., Springer, Berlin, Heidelberg, New York.
49. PENAYE, J., TOTEU, S. R, VAN SCHMUS, W. R. & NZENTI, J. P. (1993): U-Pb and Sm-Nd preliminary geochronology data on the Yaoundë series Cameroon: reinterpretation of granulitic rocks as the suture of a collision in the "Centrafrican" Belt. - C. R. Acad. Sci. Paris 317: 789-794.
50. POWELL, R. & HOLLAND, T. J. B. (1993): On the formulation of simple mixing models for complex phases. - Am. Mineral. 78: 1174-1180.
51. PYLE, J. M. & SPEAR, R S. (2003): Four generations of accessory- phase growth in low pressure migmatites from SW new Hampshire. -Am. Mineral. 88: 338-351.
52. PYLE, J. M., SPEAR, F. S., RUDNICK, R. L. & MCDONOUGH, W. F. (2001): Monazite-xenotime-garnet equilibrium in metapelites and a new monazite-garnet thermometer. - J. Petrol. 42: 2083- 2107.
53. PYLE, J. M., SPEAR, F. S., CHENEY, J. T. & LAYNE, G. (2005): Monazite ages in the Chesham Pond nappe, SW New Hampshire, USA: implications for assembly of central New England thrust sheets. - Am. Mineral. 90: 592-606.
54. SCHULZ, B. (1990): Prograde-retrograde P-T-t-deformation path of Austroalpine micaschists during Variscan continental collision (Eastern Alps). - J. Metamorph. Geol. 8: 629-643.
55. SCHULZ, B. (1993): P-T-deformation paths of Variscan metamorphism in the Austroalpine basement: controls on geothermobaro- metry from microstructures in progressively deformed metapelites. - Swiss Bull. Mineral. Petrol. 73: 257-274.
56. SCHULZ, B., BRÄTZ, H., BOMBACH, K. & KRENN, E. (2007a): Insitu Th-Pb dating of monazite by 266 nm laser ablation and ICP- MS with a single collector, and its control by EMP analysis. - Z. Angew. Geol. 35: 377-392.
57. SCHULZ, B., KRENN, E., FINGER, R, BRÄTZ, H. & KLEMD, R. (2007b): Cadomian and Variscan metamorphic events in the Leon Domain (Armorican Massif, France): P-T data and EMP monazite dating. - In: LINNEMANN, U., NANCE, D., KRAFT, R & ZULAUF, G. (Eds.): The Evolution of the Rheic Ocean: From Avalonian-Cadomian active margin to Alleghenian-Variscan collision. Geol. Soc. Am. Spec. Pap. 423: 267-285.
58. SOBA, D. (1989): La série de Lorn: étude géologique et géochrono- logique d'un bassin volcano- sédimentaire de la chaîne panafricaine de l'Est du Cameroun. - Thèse de Doctorat d'Etat, Univ. de Paris VI, France, 198 pp.
59. SPEAR, F. S. (1993): Metamorphic phase equilibria and Pressure- Temperature-Time Paths. - Mineral. Soc. Am. Monogr. Ser. 1, 799 pp., Washington DC.
60. SPEAR, F. S. & PYLE, J. M. (2002): Apatite, monazite and xenotime in metamorphic rocks. - In: KOHN, M., RAKOVAN, J. & HUGHES, J. M. (Eds.): Phosphates - Geochemical, Geobiological and Materials Importance. Rev. Mineral. Geochem. 48: 293-335. Mineral. Soc. Am., Washington DC.
61. ST-ONGE, M. R. (1987): Zoned poikiloblastic garnets: P-T paths and synmetamorphic uplift through 30 km of structural depth, Wopmay orogen, Canada. - J. Petrol. 28: 1-21.
62. SUZUKI, K., ADACHI, M. & KAJIZUKA, I. (1994): Electron microprobe observations of Pb diffusion in metamorphosed detrital monazites. - Earth Planet. Sci. Lett. 128: 391-405.
63. TAGNE KAMGA, G., MERCIER, E., ROSSY, E. & NSIFA, N. E. (1999): Synkinematic emplacement of the Pan-African Ngondo igneous complex (west Cameroon, Central Africa). - J. Afr. Earth Sci. 28: 675-691.
64. TANKO NJIOSSEU, E. L., NZENTI, J. P., NJANKO, T., KAPAJIKA, B. & NEDELEC, A. (2005): New U-Pb zircon ages from Tonga (Cameroon): coexisting Eburnean-Transamazonian (2.1 Ga) and Pan- African (0.6 Ga) imprints. - C. R. Géosci. 337: 551-562.
65. TCHAPTCHET TCHATO, D. (2000): Contribution à l'étude géologique de la région de Kékem (Ouest-Cameroun). - Mémoire de Maîtrise, Université de Yaoundé I, 5 lp.
66. TCHAPTCHET TCHATO, D. (2001): Les marqueurs de cisaillement dans les orogènes: L'exemple des métamorphites de la région de Kékem (Ouest- Cameroun). - Mémoire de D.E.A, Université de Yaoundé I, 46 p.
67. THOMPSON, A. B., TRACY, R. J., LYTTLE, P. T. & THOMPSON, J. B. R. (1977): Prograde reaction histories deducted from compositional zonation and mineral inclusions in garnet from the Gassets schist, Vermont, U.S.A. - Am. J. Sci. 277: 1152-1167.
68. TOTEU, S. F., MICHARD, A., BERTRAND, J. M. & Rocci, G. (1987): U/Pb of Precambrian rocks from northern Cameroon, orogenic evolution and chronology of the Panafrican belt of central Africa. - Precambrian Res. 37: 71-87.
69. TOTEU, S. R, PENAYE, J. & POUDJOM- DJOMANI, Y. (2004): Geo- dynamic evolution of the Pan-African belt in central Africa with special reference to Cameroon. - Can. J. Earth Sci. 41: 73-85.
70. TRACY, R. J. (1982): Compositional zoning and inclusions in metamorphic minerals. - In: FERRY, J. M. (Ed.): Characterization of metamorphism through mineral equilibria. Rev. Mineral. 10: 355-397, Mineral. Soc. Am., Washington DC.
71. TRIBOULET, C. & AUDREN, C. (1985): Continuous reactions between biotite, garnet, staurolite, kyanite-sillimanite-andalusite and P-T-time-deformation path in micaschists from the estuary of the river Vilaine, South Brittany, France. - J. Metamorph. Geol. 3:91-105.
72. WILLAMS, M. L., JERCINOVIC, M. J., GONCALVES, P. & MAHAN, K. (2006): Format and philosophy for collecting, compiling, and reporting microprobe monazite ages. - Chem. Geol. 225: 1-15.
73. WING, B. A., FERRY, J. M. & HARRISON, T. M. (2003): Prograde destruction and formation of monazite and allanite during contact and regional metamorphism of pelites: petrology and geochronology. - Contrib. Mineral. Petrol. 145: 228-250.
74. WU, C.-M. & CHENG, B. H. (2006): Valid garnet-biotite (GB) geothermometry and garnet-aluminium silicate-plagioclase- quartz (GASP) geobarometry in metapelitic rocks. - Lithos 89: 1-23.