Plate tectonics of Asia: Geological and geophysical constraints

Gondwana Research (Impact Factor: 7.4). 09/2012; 22:353-359. DOI: 10.1016/
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    ABSTRACT: A paleomagnetic study has been carried out on the Early Cretaceous Zenong Group volcanic rocks (ca. 110–130Ma) near Cuoqin town in the central Lhasa terrane. Stepwise thermal demagnetization up to 680°C isolated a stable high-temperature component (HTC) including antipodal dual polarities. The HTC directions passed both a fold test at 99% confidence and a reversal test at 95% confidence, suggesting a primary origin. The tilt-corrected average direction for 18 sites is D=327.0°, I=35.7°, κ=59.3°, α95=4.5°, which corresponds to a paleopole at 58.2° N, 341.9° E (A95=4.6°), yielding a paleolatitude of 19.8°±4.6° N for the study area. Our results, combined with previous paleomagnetic data, suggest that southern Tibet was at a mean paleolatitude of 20° N during the Cretaceous and Paleogene. When compared with the apparent polar wander paths of Asia, the difference suggests that only ca. 870km north–south crustal shortening has accumulated between the Lhasa terrane and stable Asia since ca. 110Ma. When comparing the paleolatitudes of the Lhasa terrane and India, the results indicate that the width of the Neotethys was 6720±690km during the Early Cretaceous.
    Gondwana Research - GONDWANA RES. 09/2012; 22(2):461-469.
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    ABSTRACT: A clarification/correction to the Results section of the palynological analysis pertaining to pollen grouped as “cf. Meliaceoidites-Rhoipites.”
    Geology 01/2009; · 4.64 Impact Factor
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    ABSTRACT: Sundaland comprises a heterogeneous collage of continental blocks derived from the India–Australian margin of eastern Gondwana and assembled by the closure of multiple Tethyan and back-arc ocean basins now represented by suture zones. The continental core of Sundaland comprises a western Sibumasu block and an eastern Indochina–East Malaya block with an island arc terrane, the Sukhothai Island Arc System, comprising the Linchang, Sukhothai and Chanthaburi blocks sandwiched between. This island arc formed on the margin of Indochina–East Malaya, and then separated by back-arc spreading in the Permian. The Jinghong, Nan–Uttaradit and Sra Kaeo Sutures represent this closed back-arc basin. The Palaeo-Tethys is represented to the west by the Changning–Menglian, Chiang Mai/Inthanon and Bentong–Raub Suture Zones. The West Sumatra block, and possibly the West Burma block, rifted and separated from Gondwana, along with Indochina and East Malaya in the Devonian and were accreted to the Sundaland core in the Triassic. West Burma is now considered to be probably Cathaysian in nature and similar to West Sumatra, from which it was separated by opening of the Andaman Sea basin. South West Borneo and/or East Java-West Sulawesi are now tentatively identified as the missing “Argoland” which must have separated from NW Australia in the Jurassic and these were accreted to SE Sundaland in the Cretaceous. Revised palaeogeographic reconstructions illustrating the tectonic and palaeogeographic evolution of Sundaland and adjacent regions are presented.
    Gondwana Research - GONDWANA RES. 01/2011; 19(1):3-21.


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May 30, 2014