Absolute reconstruction of the closing of the Mongol-Okhotsk Ocean in the Mesozoic elucidates the genesis of the slab geometry underneath Eurasia
|dc.identifier.citation||Wu, L. and Kravchinsky, V. and Gu, Y. and Potter, D. 2017. Absolute reconstruction of the closing of the Mongol-Okhotsk Ocean in the Mesozoic elucidates the genesis of the slab geometry underneath Eurasia. Journal of Geophysical Research: Solid Earth. 122 (7): pp. 4831-4851.|
©2017. American Geophysical Union. All Rights Reserved. Understanding the present-day fast seismic velocity anomalies in the mantle requires an accurate kinematic reconstruction of past convergent tectonics. Using the paleomagnetism-based absolute reconstruction method from Wu and Kravchinsky (2014), we present here the restoration of the closing of the Mongol-Okhotsk Ocean (MOO) that existed between Siberia and North China-Amuria (NCA) during the Mesozoic. Three stages, i.e., 250–200 Ma, 200–150 Ma, and 150–120 Ma, are identified from the time-varying convergence rates of Siberia and NCA. The spherical distance between the suture margins was reduced by approximately 66.7% at an average convergence rate of 8.8 ± 0.6 cm/yr during the first stage at 250–200 Ma, when approximately 62.5–76.1% of the slabs associated with the MOO lithosphere were formed primarily through intraoceanic convergence. In the second stage at 200–150 Ma, the spherical distance was reduced by another 21.1% with a convergence rate of 3.6 ± 0.3 cm/yr. During this stage, approximately 14.2–30.9% of the MOO slabs were formed and continental-oceanic convergence outpaced intraoceanic subduction. In the last stage at 150–120 Ma, the convergence rate dropped to approximately 0.4–0.6 cm/yr with the formation of approximately 4.6–9.8% slabs associated with the MOO lithosphere. The final closure of the remnant MOO basin could have been accomplished by 130–120 Ma, which explains the origin of the fast-velocity anomalies inside the restored continents at 120 Ma near the suture margins.
|dc.title||Absolute reconstruction of the closing of the Mongol-Okhotsk Ocean in the Mesozoic elucidates the genesis of the slab geometry underneath Eurasia|
|dcterms.source.title||Journal of Geophysical Research: Solid Earth|
|curtin.department||School of Earth and Planetary Sciences (EPS)|
|curtin.accessStatus||Fulltext not available|
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