An early India-Asia contact: Paleomagnetic constraints from Ninetyeast Ridge, ODP Leg 121

Klootwijk, Chris; Gee, Jeffrey S.; Peirce, John W.; Smith, Guy M.; McFadden, P. L.

doi:10.1130/0091-7613(1992)020<0395:aeiacp>2.3.co;2

Cited by 476 publications

(254 citation statements)

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“…An initial collision within this time range is in accordance with previous studies based on paleomagnetic or geologic data (e.g. , Klootwijk and others, 1992, Guillot and others, 2003. A significantly later collision age at the Eocene/Oligocene boundary as proposed by Aitchison and others (2007) is not in agreement with our new and previous paleomagnetic data from the Lhasa Block.…”

Section: Position Of the Lhasa Terrane Prior To India-asia Collision supporting

confidence: 92%

“…The majority of published work dates collision between ~55-50 Ma, with some younger and some older ages proposed (e.g. Garzanti and others, 1987;Jaeger and others, 1989;Klootwijk and others, 1992;De Sigoyer and others, 2000;Aitchison and others, 2007, to quote just a few of the numerous references), the range to some extent being the result of different definitions of collision and methods used to date it. In this paper we use three approaches to date collision: the time of cessation of marine facies in the suture zone; the time of first arrival of Asian detritus on the Indian plate; and paleomagnetic constraints on the positions of Indian and Asian continents through time.…”

Section: Eight Of the Eleven Samples Show Very High P Values Of Pairementioning

confidence: 99%

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Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop

Leech¹,

Klemperer²,

Mooney³

2010

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Section: Position Of the Lhasa Terrane Prior To India-asia Collision supporting

confidence: 92%

Section: Eight Of the Eleven Samples Show Very High P Values Of Pairementioning

confidence: 99%

Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop

Leech¹,

Klemperer²,

Mooney³

2010

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“…These studies suggest similarities in cooling histories along the northern, southern and eastern margins of the Tibetan Plateau following suturing of India with Eurasia in the early Tertiary at ca. 55 Ma (Klootwijk et al, 1992).…”

Section: Discussionmentioning

confidence: 99%

Differential exhumation in response to episodic thrusting along the eastern margin of the Tibetan Plateau

et al. 1997

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“…50-55 Ma (e.g., Patriat and Achache, 1984;Klootwijk et al, 1992;Leech et al, 2005;Najman et al, 2010) and is divided into four geomorphic and tectonostratigraphic zones that span much of the east-west extent of the orogen. From south to north, these are the Subhimalaya, Lesser Himalaya, Greater Himalaya, and Tethyan Himalaya (Fig.…”

Section: Tectonostratigraphymentioning

confidence: 99%

Testing the effects of topography, geometry, and kinematics on modeled thermochronometer cooling ages in the eastern Bhutan Himalaya

et al. 2018

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Abstract. In this study, reconstructions of a balanced geologic cross section in the Himalayan fold-thrust belt of eastern Bhutan are used in flexural-kinematic and thermokinematic models to understand the sensitivity of predicted cooling ages to changes in fault kinematics, geometry, topography, and radiogenic heat production. The kinematics for each scenario are created by sequentially deforming the cross section with ∼ 10 km deformation steps while applying flexural loading and erosional unloading at each step to develop a high-resolution evolution of deformation, erosion, and burial over time. By assigning ages to each increment of displacement, we create a suite of modeled scenarios that are input into a 2-D thermokinematic model to predict cooling ages. Comparison of model-predicted cooling ages to published thermochronometer data reveals that cooling ages are most sensitive to (1) the location and size of fault ramps, (2) the variable shortening rates between 68 and 6.4 mm yr −1 , and (3) the timing and magnitude of out-of-sequence faulting. The predicted ages are less sensitive to (4) radiogenic heat production and (5) estimates of topographic evolution. We used the observed misfit of predicted to measured cooling ages to revise the cross section geometry and separate one large ramp previously proposed for the modern décollement into two smaller ramps. The revised geometry results in an improved fit to observed ages, particularly young AFT ages (2-6 Ma) located north of the Main Central Thrust. This study presents a successful approach for using thermochronometer data to test the viability of a proposed cross section geometry and kinematics and describes a viable approach to estimating the first-order topographic evolution of a compressional orogen.

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An early India-Asia contact: Paleomagnetic constraints from Ninetyeast Ridge, ODP Leg 121

Cited by 476 publications

References 0 publications

Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop

Proceedings of the 25th Himalaya-Karakoram-Tibet Workshop

Differential exhumation in response to episodic thrusting along the eastern margin of the Tibetan Plateau

Testing the effects of topography, geometry, and kinematics on modeled thermochronometer cooling ages in the eastern Bhutan Himalaya

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