Water-fluxed crustal melting produces Cordilleran batholiths

Collins, William J.; Huang, Hongyan; Jiang, Xingming

doi:10.1130/g37398.1

Cited by 180 publications

(63 citation statements)

References 27 publications

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“…Batches of water‐rich fluid from deep‐sourced trapped slabs from the Paleo‐Asian Ocean would refertilize the hot lower crust by adding water to it, thereby producing another batch of crustal melts [ Collins et al , ] (Figures and ). In this way, granitic melt increments are consistently produced at temperatures <800°C [ Collins et al , 2016].…”

Section: Discussionmentioning

confidence: 99%

Tectonic significance and geodynamic processes of large‐scale Early Cretaceous granitoid magmatic events in the southern Great Xing'an Range, North China

Chung

Wang

et al. 2017

Tectonics

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The origin and geodynamic evolution of peak Early Cretaceous magmatism in the southern Great Xing'an Range, North China, have long been controversial. Here we report new U‐Pb zircon ages (141–129 Ma) of a suite of dioritic‐granitic rocks from central Inner Mongolia, far from the sutures or plate boundaries of the Paleo‐Pacific and Mongol‐Okhotsk oceans, thus delineating an Early Cretaceous intracontinental magmatic province, which had a peak activity at 130–120 Ma. Dioritic suite including diorite, tonalite, and granodiorite shows variable zircon εHf(t) of +1.4 to + 11.8 and δ18O values of +5.7 to +6.9‰, while granitic suite consisting of monzogranite, syenogranite, and granite porphyry also records variable zircon εHf(t) of −0.9 to +15.0 and δ18O values of +6.3 to +8.1‰, suggesting crustal melting by preexisting crustal source with important recycled supracrustal components including fluids. Furthermore, these rocks show variable whole‐rock δ7Li values (−0.6 to +12.1‰), indicating fluids played an important role in magma source. We propose a deep‐sourced water‐fluxed melting scenario by ancient hydrous slabs inherited from the Paleo‐Asian Ocean that were trapped in the deep interior, thus releasing aqueous fluids to melt the lithospheric mantle and produce water‐rich mafic magmas. These mafic magmas were underplated into crust where they promoted water‐fluxed partial melting to generate the large‐scale Early Cretaceous magmatism in the southern Great Xing'an Range. Such melting due to fluxing of aqueous fluids was probably operating as a widespread process responsible for the Early Cretaceous dramatically tectonomagmatic events and evolution of continental crust in NE Asia.

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Section: Discussionmentioning

confidence: 99%

Tectonic significance and geodynamic processes of large‐scale Early Cretaceous granitoid magmatic events in the southern Great Xing'an Range, North China

Chung

Wang

et al. 2017

Tectonics

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“…Crystallizing plutons (e.g. Pattison & Harte, 1988;Finger & Clemens, 1995;Symmes & Ferry, 1995;Johnson et al, 2003;Collins et al, 2016) and rocks undergoing prograde metamorphism release H 2 O into the surrounding rocks (e.g. White et al, 2005;Droop & Brodie, 2012).…”

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confidence: 99%

Local partial melting of the lower crust triggered by hydration through melt–rock interaction: an example from Fiordland, New Zealand

Stuart

Daczko

Piazolo

2016

Journal Metamorphic Geology

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We investigate a low‐strain outcrop of the lower crust, the Pembroke Granulite, exposed in northern Fiordland, New Zealand, which exhibits localized partial melting. Migmatite and associated tschermakite–clinozoisite (TC) gneiss form irregular, elongate bodies that cut a two‐pyroxene–pargasite (PP) gneiss. Gradational boundaries between rock types, and the progressive nature of changes in mineral assemblage, microstructure and chemistry are consistent with the TC gneiss and migmatite representing modified versions of the PP gneiss. Modification is essentially isochemical, where partial modification involves hydration of the assemblage and mineral chemistry changes, and complete modification involves additional recrystallization and in situ partial melt production. Microstructures of quartz and plagioclase, including small dihedral angles, string of beads textures and films surrounding amphibole and garnet grains are consistent with the former presence of melt in modified rock types. The documented rock modification is attributed to melt–rock interaction occurring during porous melt flow of a dominantly externally derived, hydrous silicate melt. Microstructures indicate melt flow occurred along grain boundaries and field relationships show it was focused into channels tens of metres wide, with preference for following the pre‐existing foliation. Melt–rock interaction at the grain scale resulted in hydration and modification of the host PP gneiss, which resulted in localized partial melting. These relationships indicate prograde hydration during localized melt–rock interaction drove migmatization of the lower crust.

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“…(a) Zr versus SiO 2 and (b) Zircon saturation temperature (T Zr ) versus SiO 2 diagrams. The shaded field of the Cordilleran calc‐alkaline batholiths and inset showing probability density plots of T Zr for calc‐alkaline (C‐A) and alkaline (A) systems for the 65–70 wt% SiO 2 interval are from Collins et al (). Gray green dashed line at 300 ppm Zr to 70 wt% SiO 2 (a) distinguishes the majority of calc‐alkaline rocks.…”

Section: The Temporal‐spatial Distribution and Characteristics Of Earmentioning

confidence: 99%

Early Mesozoic Magmatism Within the Tibetan Plateau: Implications for the Paleo‐Tethyan Tectonic Evolution and Continental Amalgamation

Chung

Hou

et al. 2019

Tectonics

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Numerous early Mesozoic magmatic rocks within the Tibetan Plateau ultimately have a geodynamic controll caused by the Paleo-Tethyan tectonic evolution and the assembly of Pangea. Based on their temporal variation and the timing of closure (235 ± 10 Ma) of the Paleo-Tethys Ocean, they can be broadly divided into two groups by zircon U-Pb geochronology: an Early to Middle Triassic (252-235 Ma) group and a Late Triassic to Early Jurassic (ca. 235-190 Ma) group. Early magmatic rocks are mainly found in the middle northern Tibetan Plateau, whereas late magmatic rocks are more widespread in the whole Tibetan Plateau. Nd and Hf isotope mapping suggests that the eastern segment of the Qiangtang is underlain by old (late Archean to early Paleoproterozoic) basement, while Southern Lhasa is underlain by juvenile lower crust, which yields Neoproterozoic to early Paleozoic model ages. Early Mesozoic tectonomagmatism was likely caused by episodic southward opening of multi-Tethys oceans, punctuated by episodes of subduction and collision. The Middle to Late Permian tectonomagmatic history of Paleo-Tethys was dominated by continental arc-related systems. During the Early to Middle Triassic, the tectonomagmatic history was associated with the ongoing closure of the Paleo-Tethys Ocean and a tectonic transition from subduction to collision. Late Triassic tectonomagmatism formed in a post-collisional setting following the closure of the Paleo-Tethys Ocean and the ultimate assembly of Pangea. Early Mesozoic magmatism within the Tibetan Plateau thus provides crucial information on the history of oceanic-continental evolution and helps constrain the tectonic transition from subduction/accretion through to collision/postcollision for East Paleo-Tethys.Plain Language Summary The Tibetan Plateau was amalgamated by the successive northward drift of continental crustal fragments away from Gondwanaland and their subsequent collision with the southern margin of Asia during the Mesozoic to Cenozoic. However, our knowledge of the tectonic history of the Paleo-Tethys Ocean and continental amalgamation in the Tibetan Plateau prior to its demise during the early Mesozoic still remains poorly understood. Therefore, understanding the tectonomagmatic history and geodynamic evolution of the Paleo-Tethys Ocean and the ultimate assembly of Pangea in the early Mesozoic, and the subsequent opening and subduction history of the Meso/Neo-Tethys Ocean, is key to deciphering the evolution of Eurasia and Tethys, particularly for understanding the paleogeography and accretion-collision history that preconditioned the Tibetan lithosphere for subsequent collisional/postcollisional events and surface uplift. In our interpretations, Early Mesozoic tectonomagmatism requires episodic southward opening of multi-Tethys oceans, punctuated by episodes of subduction and collision with two-stages of magmatic evolution and crustal growth.This review pulls together the available information on the early Mesozoic magmatism within the Tibetan Plateau in order to reconstruct t...

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Water-fluxed crustal melting produces Cordilleran batholiths

Cited by 180 publications

References 27 publications

Tectonic significance and geodynamic processes of large‐scale Early Cretaceous granitoid magmatic events in the southern Great Xing'an Range, North China

Tectonic significance and geodynamic processes of large‐scale Early Cretaceous granitoid magmatic events in the southern Great Xing'an Range, North China

Local partial melting of the lower crust triggered by hydration through melt–rock interaction: an example from Fiordland, New Zealand

Early Mesozoic Magmatism Within the Tibetan Plateau: Implications for the Paleo‐Tethyan Tectonic Evolution and Continental Amalgamation

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