Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal

Matthew J. Kohn; Mark S. Wieland; Christopher D. Parkinson; Bishal N. Upreti

doi:10.1016/j.epsl.2004.10.007

Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal

Matthew J. Kohn, Mark S. Wieland, Christopher D. Parkinson, Bishal N. Upreti

Geosciences Department

Research output: Contribution to journal › Article › peer-review

175 Scopus citations

Abstract

Combination of geochemical zoning in metamorphic garnet and monazite plus in situ Th-Pb isotopic dating of monazite yields P-T conditions, ages and convergence rates for the Main Central Thrust (MCT) and affiliated faults in central Nepal. Inferred rates were 1.5±0.9 cm/yr (Langtang Thrust, ∼19 Ma), 2.2±0.7 cm/yr (Main Central Thrust, ∼15 Ma) and 7±3 cm/yr (Ramgarh Thrust, ∼10 Ma). The lower values are similar to modern convergence rates across the Himalaya, but the Ramgarh Thrust may have briefly absorbed all Indo-Asian convergence at ∼10 Ma, when foreland and marine sedimentation rates markedly increased, and at least one major strike slip fault in Tibet experienced a hiatus in movement. Variable rates of convergence across the Himalaya on Myr timescales imply Myr variations in strain rates throughout all components of the Indo-Asian orogen.

Original language	English
Pages (from-to)	299-310
Number of pages	12
Journal	Earth and Planetary Science Letters
Volume	228
Issue number	3-4
DOIs	https://doi.org/10.1016/j.epsl.2004.10.007
State	Published - 15 Dec 2004

Keywords

Geochronology
Himalaya
Melting
Metamorphism
Monazite

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10.1016/j.epsl.2004.10.007

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title = "Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal",

abstract = "Combination of geochemical zoning in metamorphic garnet and monazite plus in situ Th-Pb isotopic dating of monazite yields P-T conditions, ages and convergence rates for the Main Central Thrust (MCT) and affiliated faults in central Nepal. Inferred rates were 1.5±0.9 cm/yr (Langtang Thrust, ∼19 Ma), 2.2±0.7 cm/yr (Main Central Thrust, ∼15 Ma) and 7±3 cm/yr (Ramgarh Thrust, ∼10 Ma). The lower values are similar to modern convergence rates across the Himalaya, but the Ramgarh Thrust may have briefly absorbed all Indo-Asian convergence at ∼10 Ma, when foreland and marine sedimentation rates markedly increased, and at least one major strike slip fault in Tibet experienced a hiatus in movement. Variable rates of convergence across the Himalaya on Myr timescales imply Myr variations in strain rates throughout all components of the Indo-Asian orogen.",

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AU - Kohn, Matthew J.

AU - Wieland, Mark S.

AU - Parkinson, Christopher D.

AU - Upreti, Bishal N.

PY - 2004/12/15

Y1 - 2004/12/15

N2 - Combination of geochemical zoning in metamorphic garnet and monazite plus in situ Th-Pb isotopic dating of monazite yields P-T conditions, ages and convergence rates for the Main Central Thrust (MCT) and affiliated faults in central Nepal. Inferred rates were 1.5±0.9 cm/yr (Langtang Thrust, ∼19 Ma), 2.2±0.7 cm/yr (Main Central Thrust, ∼15 Ma) and 7±3 cm/yr (Ramgarh Thrust, ∼10 Ma). The lower values are similar to modern convergence rates across the Himalaya, but the Ramgarh Thrust may have briefly absorbed all Indo-Asian convergence at ∼10 Ma, when foreland and marine sedimentation rates markedly increased, and at least one major strike slip fault in Tibet experienced a hiatus in movement. Variable rates of convergence across the Himalaya on Myr timescales imply Myr variations in strain rates throughout all components of the Indo-Asian orogen.

AB - Combination of geochemical zoning in metamorphic garnet and monazite plus in situ Th-Pb isotopic dating of monazite yields P-T conditions, ages and convergence rates for the Main Central Thrust (MCT) and affiliated faults in central Nepal. Inferred rates were 1.5±0.9 cm/yr (Langtang Thrust, ∼19 Ma), 2.2±0.7 cm/yr (Main Central Thrust, ∼15 Ma) and 7±3 cm/yr (Ramgarh Thrust, ∼10 Ma). The lower values are similar to modern convergence rates across the Himalaya, but the Ramgarh Thrust may have briefly absorbed all Indo-Asian convergence at ∼10 Ma, when foreland and marine sedimentation rates markedly increased, and at least one major strike slip fault in Tibet experienced a hiatus in movement. Variable rates of convergence across the Himalaya on Myr timescales imply Myr variations in strain rates throughout all components of the Indo-Asian orogen.

KW - Geochronology

KW - Himalaya

KW - Melting

KW - Metamorphism

KW - Monazite

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M3 - Article

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JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

IS - 3-4

ER -

Miocene faulting at plate tectonic velocity in the Himalaya of central Nepal

Abstract

Keywords

UN SDGs

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