Introduction to the structures and processes of subduction zones

Zheng, Yong‐Fei; Zhao, Zi‐Fu

doi:10.1016/j.jseaes.2017.06.034

Cited by 67 publications

(37 citation statements)

References 168 publications

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“…Granulites may record vital information on orogenic processes from collisional thickening to extensional thinning because their P-T-t paths are conducive to revealing the nature of orogenic evolution (e.g. Brown, 1993;García-Casco, Torre-Roldán, Millán, Monié, & Haissen, 2001;Gibson & Ireland, 1995;Harley, 1989;Kelsey & Hand, 2015;O'Brien, 2000;Zhao, Cawood, Wilde, & Lu, 2001;Zheng & Zhao, 2017). However, it is not easy to acquire dependable P-T-t paths of granulites due to the continuous re-equilibration of rock-forming and accessory minerals during HT to UHT metamorphism at crustal depths (e.g.…”

mentioning

confidence: 99%

Granulites record the tectonic evolution from collisional thickening to extensional thinning of the Tongbai orogen in central China

Zhang

Gao

Chen

et al. 2020

Journal Metamorphic Geology

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A combined study of petrology and geochemistry was carried out for granulites from the Tongbai orogen in central China. The results reveal the tectonic evolution from collisional thickening to extensional thinning of the lithosphere at the convergent plate boundary. Petrographic observations, zircon U–Pb dating, and pseudosection calculations indicate that the granulites underwent four metamorphic stages, which are categorized into two cycles. The first cycle occurred at 490–450 Ma and involves high‐P (HP) metamorphism (M1) at 785–815°C and 10–14 kbar followed by decompressional heating to 840–880°C and 8–9 kbar for medium‐pressure granulite facies metamorphism (M2), defining a clockwise P–T path. The high pressure is indicated by the occurrence of inclusions of rutile+kyanite+K‐feldspar in the garnet mantle. The second cycle occurred at c. 440 Ma and shows an anticlockwise P–T path with continuous heating to ultrahigh‐temperature (UHT) metamorphism (M3) at 890–980°C and 9–11 kbar, followed by decompressional cooling to 740–880°C and 7–9 kbar (M4) till 405 Ma. The HP metamorphism is synchronous with the ultrahigh‐pressure eclogite facies metamorphism in the Qinling orogen, indicating its relevance to the continental collision in the Cambrian. The UHT metamorphism took place at reduced pressures, indicating thinning of the collision‐thickened orogenic lithosphere. Therefore, the Tongbai orogen was initially thickened by the collisional orogeny and then thinned, possibly as a result of foundering of the orogenic root. Such tectonic evolution may be common in collisional orogens where compression during continental collision switched to extension during continental rifting.

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mentioning

confidence: 99%

Granulites record the tectonic evolution from collisional thickening to extensional thinning of the Tongbai orogen in central China

Zhang

Gao

Chen

et al. 2020

Journal Metamorphic Geology

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“…As a consequence, the mantle domains can become partially melted for arc magmatism in the stage of extension. Duration for the thermal transition from coupling to decoupling between the subducting slab and mantle wedge may be short (<1 Ma) or long (>100 Ma), depending on the geodynamics of subduction zones [28]. The short duration is typical of arc magmatism above the circum-Pacific subduction zones, whereas the long duration is common for post-collisional arc-like magmatism in intracontinental regions.…”

Section: Metallogenesis Of Accretionary Orogensmentioning

confidence: 99%

“…Thus, it is critical to distinguish the collisional orogeny from both pre-collisional accretionary orogeny and post-collisional rifting orogeny in given orogens [17,27,28,47]. While a heat supply from the asthenospheric mantle is prominent during continental rifting [27,28], the proportion of material supply has decreased from the maximum during the accretionary orogeny (Fig. 4a) to the minimum during the collisional orogeny (Fig.…”

Section: Metallogenesis Of Granitic Rocksmentioning

confidence: 99%

Hydrothermal ore deposits in collisional orogens

et al. 2019

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“…Subduction zones, occurring at convergent plate boundaries, play a primary role in the ongoing differentiation of Earth and deliver crustal material to the mantle (e.g., Gaschnig et al, ; Morris et al, ; Plank & Langmuir, ; Tatsumi & Eggins, ; Zheng & Zhao, ). They serve both to generate new continental crust through arc magmatism and to transport crustal materials into the deep mantle (e.g., Jones Rees et al, ; Ryan & Chauvel, ).…”

Section: Introductionmentioning

confidence: 99%

Arc Andesitic Rocks Derived From Partial Melts of Mélange Diapir in Subduction Zones: Evidence From Whole‐Rock Geochemistry and Sr‐Nd‐Mo Isotopes of the Paleogene Linzizong Volcanic Succession in Southern Tibet

Yan

Long

et al. 2019

JGR Solid Earth

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Formation of andesitic rocks is crucial to understand the evolution of continental crust.Here we present an integrated study for the Paleocene Dianzhong Formation of the Linzizong volcanic succession (LVS) in the Lhasa terrane, southern Tibet. The andesites of the Dianzhong Formation have relatively high Mg # (38-60) and exhibit typical subduction-like geochemical signatures. They are characterized by slightly enriched ε Nd (t) values (−2.82-0.35) and have a range of δ 98 / 95 Mo isotopic compositions (−0.40 to 0.13 ‰) larger than mid-ocean ridge basalt. Their high Mg # , moderate light rare earth element-enriched patterns, and slightly enriched ε Nd (t) values clearly rule out an origin of continental crust-derived melts or partial melts of earlier underplated mafic rocks. The dacites show similar geochemistry to the andesites, indicating an origin from the parental magmas of the andesites. Based on the geochemical comparisons between the Dianzhong andesites and rocks of mélange, we suggest that the andesitic rocks of the LVS were derived from partial melts of a mantle source dominated by mélange that formed along the subduction channel. The mélange diapir melting was triggered by asthenospheric upwelling and corner flow during the Paleocene slab roll-back of northward subducted Neotethyan oceanic crust. Because the Early Paleocene andesitic rocks in southern Lhasa show an average composition of continental crust, the partial melting of mélange rocks most likely provide an important mechanism for the production of andesitic magmas within continental arcs.

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Introduction to the structures and processes of subduction zones

Cited by 67 publications

References 168 publications

Granulites record the tectonic evolution from collisional thickening to extensional thinning of the Tongbai orogen in central China

Granulites record the tectonic evolution from collisional thickening to extensional thinning of the Tongbai orogen in central China

Hydrothermal ore deposits in collisional orogens

Arc Andesitic Rocks Derived From Partial Melts of Mélange Diapir in Subduction Zones: Evidence From Whole‐Rock Geochemistry and Sr‐Nd‐Mo Isotopes of the Paleogene Linzizong Volcanic Succession in Southern Tibet

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