TY - JOUR
T1 - Palaeolatitude and age of the Indo-Asia collision
T2 - Palaeomagnetic constraints
AU - Dupont-Nivet, Guillaume
AU - Lippert, Peter C.
AU - van Hinsbergen, Douwe J.J.
AU - Meijers, Maud J.M.
AU - Kapp, Paul
PY - 2010/9
Y1 - 2010/9
N2 - Ongoing controversies on the timing and kinematics of the Indo-Asia collision can be solved by palaeomagnetically determined palaeolatitudes of terranes bounding the Indo-Asia suture zone. We show here, based on new palaeomagnetic data from the Linzizong volcanic rocks (54-47 Ma) near the city of Lhasa, that the latitude of the southern margin of Asia was 22.8 ± 4.2°N when these rocks were deposited. This result, combined with revised palaeomagnetic results from the northernmost sedimentary units of Greater India and with apparent polar wander paths of India and Eurasia, palaeomagnetically constrain the collision to have occurred at 46 ± 8 Ma (95 per cent confidence interval). These palaeomagnetic results are consistent with tomographic anomalies at 15-25°N that are interpreted to locate the Tethyan oceanic slab that detached following collision, and with independent 56-46 Ma collision age estimates inferred from the timing of slowing down of India, high pressure metamorphism, the end of marine sedimentation and the first occurrence of suture zone and arc detritus on the Greater Indian margin. When compared with apparent polar wander paths of India and Eurasia, the ~46 Ma onset of collision at 22.8 ± 4.2°N implies 2900 ± 600 km subsequent latitudinal convergence between India and Asia divided into 1100 ± 500 km within Asia and 1800 ± 700 km within India.
AB - Ongoing controversies on the timing and kinematics of the Indo-Asia collision can be solved by palaeomagnetically determined palaeolatitudes of terranes bounding the Indo-Asia suture zone. We show here, based on new palaeomagnetic data from the Linzizong volcanic rocks (54-47 Ma) near the city of Lhasa, that the latitude of the southern margin of Asia was 22.8 ± 4.2°N when these rocks were deposited. This result, combined with revised palaeomagnetic results from the northernmost sedimentary units of Greater India and with apparent polar wander paths of India and Eurasia, palaeomagnetically constrain the collision to have occurred at 46 ± 8 Ma (95 per cent confidence interval). These palaeomagnetic results are consistent with tomographic anomalies at 15-25°N that are interpreted to locate the Tethyan oceanic slab that detached following collision, and with independent 56-46 Ma collision age estimates inferred from the timing of slowing down of India, high pressure metamorphism, the end of marine sedimentation and the first occurrence of suture zone and arc detritus on the Greater Indian margin. When compared with apparent polar wander paths of India and Eurasia, the ~46 Ma onset of collision at 22.8 ± 4.2°N implies 2900 ± 600 km subsequent latitudinal convergence between India and Asia divided into 1100 ± 500 km within Asia and 1800 ± 700 km within India.
KW - Asia
KW - Continental tectonics: compressional
KW - Palaeomagnetism applied to tectonics
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U2 - 10.1111/j.1365-246X.2010.04697.x
DO - 10.1111/j.1365-246X.2010.04697.x
M3 - Article
AN - SCOPUS:77955746212
SN - 0956-540X
VL - 182
SP - 1189
EP - 1198
JO - Geophysical Journal International
JF - Geophysical Journal International
IS - 3
ER -