AustralieFrV1, Main, Exploration, bibRecord, 00B901

Paleomagnetism, geochronology and tectonic implications of the Cambrian-age Carion granite, Central Madagascar

Identifieur interne : 00B901 ( Main/Exploration ); précédent : 00B900; suivant : 00B902

Paleomagnetism, geochronology and tectonic implications of the Cambrian-age Carion granite, Central Madagascar

Auteurs : Joseph G. Meert [États-Unis] ; Anne Nédélec [France] ; Chris Hall [États-Unis] ; Michael T. D. Wingate [Australie] ; Michel Rakotondrazafy [Madagascar]

Source :

Tectonophysics [ 0040-1951 ] ; 2001.

RBID : ISTEX:F672927FD0F59B37F3EA87C5B227D9A42166D46D

Descripteurs français

Wicri :
- geographic : Madagascar.

English descriptors

KwdEn :
- Angavo, Angavo belt, Antananarivo, Biotite, Biotite sample, Cambrian, Carion, Carion granite, Carion massif, Carion pluton, Carion pole, Carion rocks, Central madagascar, Closure temperature, Cooling history, Country rocks, Demagnetization, Dunlop, Earth planet, East africa, East gondwana, Emplacement, Field demagnetization, Field transition, Foliation, Geochronology, Geol, Geophys, Gondwana, Gondwana assembly, Hornblende, Hornblende samples, Kirschvink, Klootwijk, Krone, Lett, Lineation, Madagascar, Madison razanatseheno, Magnetic minerals, Magnetite, Magnetization, Massif, Mcelhinny, Meert, Nedelec, Orogenic, Orogenic events, Paleomagnetic, Paleomagnetic pole, Paleomagnetic results, Paleomagnetism, Plateau ages, Pluton, Precambrian, Rapid motion, Remanence, Reversal test, Shrimp, Slow cooling, Southern madagascar, Tectonics, Tectonophysics, Thermal demagnetization, Thermal history, Torsvik, Western australia, Zircon.
Teeft :
- Angavo, Angavo belt, Antananarivo, Biotite, Biotite sample, Cambrian, Carion, Carion granite, Carion massif, Carion pluton, Carion pole, Carion rocks, Central madagascar, Closure temperature, Cooling history, Country rocks, Demagnetization, Dunlop, Earth planet, East africa, East gondwana, Emplacement, Field demagnetization, Field transition, Foliation, Geochronology, Geol, Geophys, Gondwana, Gondwana assembly, Hornblende, Hornblende samples, Kirschvink, Klootwijk, Krone, Lett, Lineation, Madagascar, Madison razanatseheno, Magnetic minerals, Magnetite, Magnetization, Massif, Mcelhinny, Meert, Nedelec, Orogenic, Orogenic events, Paleomagnetic, Paleomagnetic pole, Paleomagnetic results, Paleomagnetism, Plateau ages, Pluton, Precambrian, Rapid motion, Remanence, Reversal test, Shrimp, Slow cooling, Southern madagascar, Tectonics, Tectonophysics, Thermal demagnetization, Thermal history, Torsvik, Western australia, Zircon.

Abstract

Abstract: The Carion granitic pluton in central Madagascar was intruded into warm continental crust following orogenic events related to the final amalgamation of Gondwana. U–Pb SHRIMP dating of the pluton yields an emplacement age of 532.1±5.2 Ma followed by relatively slow cooling as constrained by 40Ar/39Ar ages on hornblende and biotite. Four hornblende samples yielded a mean 40Ar/39Ar age of 512.7±1.3 Ma. A biotite sample yielded an age of 478.9±1.0 Ma. Paleomagnetic samples from the pluton and surrounding country rocks exhibit either SE-upwardly directed magnetizations (mean Dec=113°, Inc=−56°, k=106, α95=12°) or NW-downwardly directed magnetizations (mean Dec=270°, Inc=+64°, k=30, α95=11°) that pass a reversal test with a classification of ‘C’ and an angular difference of 14.4°. The ‘normal’ (negative inclinations) and ‘reverse’ (positive inclinations) directions also show a spatial bias within the pluton, suggesting a field transition from reverse to normal during cooling. The paleomagnetic pole calculated from the mean direction falls at 6.8°S, 001°E (dp=13°, dm=17°). Estimates of the blocking temperature for the magnetization are compared to the cooling history of the pluton and an age of 508.5±11.5 Ma is assigned to the pole. The Carion pole falls near similar-age poles from elsewhere in Gondwana, supporting the idea that the major orogenic events during Gondwana assembly were complete. A slight revision of the Gondwana apparent polar wander path (APWP) is proposed with rapid APW from 540 to 520 Ma; however, the proposed mechanisms to explain this rapid APW (including intertial-interchange true polar wander (TPW) or enhanced mantle driving forces) cannot fully explain all the data.

Url:

https://api.istex.fr/document/F672927FD0F59B37F3EA87C5B227D9A42166D46D/fulltext/pdf

DOI: 10.1016/S0040-1951(01)00163-9

Affiliations:

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Le document en format XML

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<term>Angavo belt</term>
<term>Antananarivo</term>
<term>Biotite</term>
<term>Biotite sample</term>
<term>Cambrian</term>
<term>Carion</term>
<term>Carion granite</term>
<term>Carion massif</term>
<term>Carion pluton</term>
<term>Carion pole</term>
<term>Carion rocks</term>
<term>Central madagascar</term>
<term>Closure temperature</term>
<term>Cooling history</term>
<term>Country rocks</term>
<term>Demagnetization</term>
<term>Dunlop</term>
<term>Earth planet</term>
<term>East africa</term>
<term>East gondwana</term>
<term>Emplacement</term>
<term>Field demagnetization</term>
<term>Field transition</term>
<term>Foliation</term>
<term>Geochronology</term>
<term>Geol</term>
<term>Geophys</term>
<term>Gondwana</term>
<term>Gondwana assembly</term>
<term>Hornblende</term>
<term>Hornblende samples</term>
<term>Kirschvink</term>
<term>Klootwijk</term>
<term>Krone</term>
<term>Lett</term>
<term>Lineation</term>
<term>Madagascar</term>
<term>Madison razanatseheno</term>
<term>Magnetic minerals</term>
<term>Magnetite</term>
<term>Magnetization</term>
<term>Massif</term>
<term>Mcelhinny</term>
<term>Meert</term>
<term>Nedelec</term>
<term>Orogenic</term>
<term>Orogenic events</term>
<term>Paleomagnetic</term>
<term>Paleomagnetic pole</term>
<term>Paleomagnetic results</term>
<term>Paleomagnetism</term>
<term>Plateau ages</term>
<term>Pluton</term>
<term>Precambrian</term>
<term>Rapid motion</term>
<term>Remanence</term>
<term>Reversal test</term>
<term>Shrimp</term>
<term>Slow cooling</term>
<term>Southern madagascar</term>
<term>Tectonics</term>
<term>Tectonophysics</term>
<term>Thermal demagnetization</term>
<term>Thermal history</term>
<term>Torsvik</term>
<term>Western australia</term>
<term>Zircon</term>
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<term>Angavo belt</term>
<term>Antananarivo</term>
<term>Biotite</term>
<term>Biotite sample</term>
<term>Cambrian</term>
<term>Carion</term>
<term>Carion granite</term>
<term>Carion massif</term>
<term>Carion pluton</term>
<term>Carion pole</term>
<term>Carion rocks</term>
<term>Central madagascar</term>
<term>Closure temperature</term>
<term>Cooling history</term>
<term>Country rocks</term>
<term>Demagnetization</term>
<term>Dunlop</term>
<term>Earth planet</term>
<term>East africa</term>
<term>East gondwana</term>
<term>Emplacement</term>
<term>Field demagnetization</term>
<term>Field transition</term>
<term>Foliation</term>
<term>Geochronology</term>
<term>Geol</term>
<term>Geophys</term>
<term>Gondwana</term>
<term>Gondwana assembly</term>
<term>Hornblende</term>
<term>Hornblende samples</term>
<term>Kirschvink</term>
<term>Klootwijk</term>
<term>Krone</term>
<term>Lett</term>
<term>Lineation</term>
<term>Madagascar</term>
<term>Madison razanatseheno</term>
<term>Magnetic minerals</term>
<term>Magnetite</term>
<term>Magnetization</term>
<term>Massif</term>
<term>Mcelhinny</term>
<term>Meert</term>
<term>Nedelec</term>
<term>Orogenic</term>
<term>Orogenic events</term>
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<term>Paleomagnetic pole</term>
<term>Paleomagnetic results</term>
<term>Paleomagnetism</term>
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<term>Precambrian</term>
<term>Rapid motion</term>
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<term>Reversal test</term>
<term>Shrimp</term>
<term>Slow cooling</term>
<term>Southern madagascar</term>
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<term>Tectonophysics</term>
<term>Thermal demagnetization</term>
<term>Thermal history</term>
<term>Torsvik</term>
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<term>Zircon</term>
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<front><div type="abstract" xml:lang="en">Abstract: The Carion granitic pluton in central Madagascar was intruded into warm continental crust following orogenic events related to the final amalgamation of Gondwana. U–Pb SHRIMP dating of the pluton yields an emplacement age of 532.1±5.2 Ma followed by relatively slow cooling as constrained by 40Ar/39Ar ages on hornblende and biotite. Four hornblende samples yielded a mean 40Ar/39Ar age of 512.7±1.3 Ma. A biotite sample yielded an age of 478.9±1.0 Ma. Paleomagnetic samples from the pluton and surrounding country rocks exhibit either SE-upwardly directed magnetizations (mean Dec=113°, Inc=−56°, k=106, α95=12°) or NW-downwardly directed magnetizations (mean Dec=270°, Inc=+64°, k=30, α95=11°) that pass a reversal test with a classification of ‘C’ and an angular difference of 14.4°. The ‘normal’ (negative inclinations) and ‘reverse’ (positive inclinations) directions also show a spatial bias within the pluton, suggesting a field transition from reverse to normal during cooling. The paleomagnetic pole calculated from the mean direction falls at 6.8°S, 001°E (dp=13°, dm=17°). Estimates of the blocking temperature for the magnetization are compared to the cooling history of the pluton and an age of 508.5±11.5 Ma is assigned to the pole. The Carion pole falls near similar-age poles from elsewhere in Gondwana, supporting the idea that the major orogenic events during Gondwana assembly were complete. A slight revision of the Gondwana apparent polar wander path (APWP) is proposed with rapid APW from 540 to 520 Ma; however, the proposed mechanisms to explain this rapid APW (including intertial-interchange true polar wander (TPW) or enhanced mantle driving forces) cannot fully explain all the data.</div>
</front>
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Paleomagnetism, geochronology and tectonic implications of the Cambrian-age Carion granite, Central Madagascar

Paleomagnetism, geochronology and tectonic implications of the Cambrian-age Carion granite, Central Madagascar

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri