Subducting lithospheric plates are the cool, downwelling limbs of mantle convection and the negative buoyancy of subducting slabs (slab pull) drives plate tectonics [Forsyth and Uyeda, 1975]. Subduction zones are regions of intense earthquake activity, explosive volcanism, and complex mass transfer between the crust, mantle, hydrosphere, and atmosphere. In this contribution, I present subductio...

• The gabbro was originated from metasomatized lithospheric mantle. hornblende formed mixing of asthenosphere and slab breakoff propagated eastward under the Lhasa terrane in Paleocene-Eocene. Past geodynamic events can be reconstructed using spatial temporal patterns geochemical variability igneous rocks. Here we apply this principle to define timing geometry Neo-Tethyan after India-Asia colli...

Late Paleozoic–early Mesozoic intrusive rocks are distributed widely along the northern margin of Qaidam Basin in Tibetan Plateau. To constrain tectonic evolution, we carried out petrological, chronological, and geochemical studies Chahannuo gabbros. LA-ICP-MS Zircon U–Pb dating yields an age 255.0 ± 0.9 Ma for gabbros, which confirms existence Indosinian tectono-magmatic activity on Basin. The...

Abstract Accurate lithostratigraphy framework of the Central Qilian belt is key to understand subduction-collision Proto-Tethyan Ocean in NE Tibetan Plateau. The Dongchagou and Moshigou formations share similar detrital zircon age populations with youngest peak at ca. 1.15–1.21 Ga, which consistent granitoid gneiss Liujiatai Formation. In combination rock assemblages, metamorphic facies, associ...

Abstract The Triassic tectonic setting of the Tethyan Himalaya in southern Tibet remains controversial and is key to revealing mechanism Neo-Tethys Ocean opening breakup history Gondwana. This paper reports 227–225 Ma mafic volcanic rocks interbedded within sequence Tibet, which were formed a typical passive continental margin setting. basalts are tholeiitic with high TiO2 (3.20–3.38 wt%) moder...

Low-temperature thermochronometry reveals regional Late Cenozoic denudation in Fiordland, New Zealand, consistent with geodynamic models showing uplift of the overriding plate during incipient subduction. The data show a northward progression of exhumation in response to northward migration of the initiation of subduction. The locus of most recent uplift coincides with a large positive Bouguer ...

We show that a new subduction zone can initiate at a preexisting dipping fault zone with reasonable plate forces, consistent with what is observed in the western Pacific. The dynamics of subduction initiation within a viscoelastic medium has been systematically explored with the finite element method. We investigate the compression of oceanic lithosphere with hoth force and velocity boundary co...