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• W302515527 abstract "To better constrain the Late Triassic paleolatitude of the Qiangtang block and the closure of the Paleo-Tethys Ocean, a combined paleomagnetic and zircon U/Pb geochronological study has been conducted on the Upper Triassic Jiapila Formation volcanic rocks on the northern edge of the Qiangtang block of Central Tibet (34.1°N, 92.4°E). These rocks are dated to 204–213 Ma. Progressive thermal or alternating field demagnetization successfully isolated stable characteristic remanent magnetizations (ChRM) that pass both the fold and reversal tests, consistent with a primary magnetization. These are the first volcanic-based paleomagnetic results from pre-Cretaceous rocks of the Qiangtang block that appear to average secular variation well enough to yield a reliable paleolatitude estimate. Based on our new paleomagnetic data from Upper Triassic lavas, we conclude that the Late Triassic pole of the Qiangtang block was located at 64.0°N, 174.7°E, with A 95 = 6.6 ° ( N = 29 ). We compile published paleomagnetic data from the Qiangtang block to calculate a Late Triassic latitude for the Qiangtang block at 31.7 ± 3.0°N. The central Paleo-Tethys Ocean basin was located between the North China (NCB) and Tarim blocks to the north and the Qiangtang block to the south during Late Paleozoic–Early Mesozoic. A comparison of published Early Triassic paleopole from the Qiangtang block with the coeval paleopoles from the NCB and Tarim indicates that the Paleo-Tethys Ocean could not have closed during the Early Triassic and that its width was approximately ∼32–38° latitude (∼3500–4200 km). However, the comparison of our new combined Late Triassic paleomagnetic result with the Late Triassic poles of the NCB and Tarim, as well as numerous geological observations, indicates that the closure of the Paleo-Tethys Ocean at the longitude of the Qiangtang block most likely occurred during the Late Triassic. • We provide the Late Triassic volcanic paleomagnetic results from Qiangtang block. • The Late Triassic latitude of the Qiangtang block was 31.7 ± 3.0°N. • The latitudinal width of Paleo-Tethys Ocean was ∼3600 km during Early Triassic. • The closure of Paleo-Tethys Ocean most likely occurred during Late Triassic." @default.
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• W302515527 date "2015-08-01" @default.
• W302515527 modified "2023-10-17" @default.
• W302515527 title "Late Triassic paleolatitude of the Qiangtang block: Implications for the closure of the Paleo-Tethys Ocean" @default.
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• W302515527 doi "https://doi.org/10.1016/j.epsl.2015.05.020" @default.
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