The production of granitic magmas through crustal anatexis at convergent plate boundaries

Zheng, Yong‐Fei; Gao, Peng

doi:10.1016/j.lithos.2021.106232

Cited by 51 publications

(24 citation statements)

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“…During the compressional stages of India‐Asia collision, the lithosphere is thickened and the thermal gradient is too low for partial melting (Schenker et al., 2012). Whereas during extensional stages, the leucogranite could be generated by both asthenospheric upwelling and lithospheric thinning triggering partial melting (Aoya et al., 2005; Collins & Richards, 2008; Zheng & Gao, 2021) and high degree of fractionation processes (Wu et al., 2020). These events weakened the crust and led to lateral sliding of upper crust, surface extension, and normal faulting (Vanderhaeghe & Teyssier, 2001).…”

Section: Discussionmentioning

confidence: 99%

“…The history of the continental crust is the sum of processes of new crust generation and reworking of pre‐existing crustal components (Cawood et al., 2021). Granite is a key component of the continental crust and is mainly formed at convergent continental margins in accretionary and collisional orogens (Sawyer et al., 2011; Zheng & Gao, 2021). Leucogranite, characterized by less than 5% of dark‐colored minerals (e.g., biotite), is a minor but widely distributed component of most orogens in Western Europe (e.g., Monecke et al., 2011), the North and South American Cordilleras (Atherton & Petford, 1993; Gaschnig et al., 2011), the Grenville Province (Chiarenzelli et al., 2017), and the Himalayas (Liu, Wang et al., 2020; Wu et al., 2020; Zhang et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

“…

The history of the continental crust is the sum of processes of new crust generation and reworking of pre-existing crustal components (Cawood et al, 2021). Granite is a key component of the continental crust and is mainly formed at convergent continental margins in accretionary and collisional orogens (Sawyer et al, 2011;Zheng & Gao, 2021). Leucogranite, characterized by less than 5% of dark-colored minerals (e.g., biotite), is a minor but widely distributed component of most orogens in Western Europe (e.g.,

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confidence: 99%

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Leucogranite Records Multiple Collisional Orogenies

Liu

Zhu

Wang

et al. 2022

Geophysical Research Letters

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The history of the continental crust is the sum of processes of new crust generation and reworking of pre-existing crustal components (Cawood et al., 2021). Granite is a key component of the continental crust and is mainly formed at convergent continental margins in accretionary and collisional orogens (Sawyer et al., 2011;Zheng & Gao, 2021). Leucogranite, characterized by less than 5% of dark-colored minerals (e.g., biotite), is a minor but widely distributed component of most orogens in Western Europe (e.g.,

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…

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mentioning

confidence: 99%

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Leucogranite Records Multiple Collisional Orogenies

Liu

Zhu

Wang

et al. 2022

Geophysical Research Letters

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“…Yet another setting for post-collisional magmatism is in metamorphic core complexes, which may form on overthickened crust, or over regions such as backarcs experiencing extension from slab rollback (Vanderhaeghe and Teyssier, 1997;Whitney et al, 2004Whitney et al, , 2013Lamont et al, 2020;Soleimani et al, 2021). In most metamorphic core complexes, the magmas form the cores of gneiss domes, typically forming migmatitic to leucogranite sheets derived from remelting of pre-accreted crust with little or no additional contributions from the mantle (Zheng and Chen, 2021;Zheng and Gao, 2021).…”

Section: Late-to Post-collisional Magmatismmentioning

confidence: 99%

“…In young orogens, upper crustal extension often follows, or accompanies, crustal thickening and can be related with the formation of graben at high angles to the orogenic strike as in Tibet, or can be linked with the formation of metamorphic core complexes and the emplacement of late-collisional minimum melting anatectic granitoids (Dewey, 1988;Burchfiel et al, 1992;Chen, 2017, 2021;Zheng and Gao, 2021). The granites are typically K-rich, crosscutting structures, similar to those that mark one of the final stages in the evolution of many cratons (Kusky, 1993).…”

Section: Orogenic Collapse Related Granitoidsmentioning

confidence: 99%

Growth of continental crust in intra-oceanic and continental-margin arc systems: Analogs for Archean systems

Kusky

Wang

2022

Sci. China Earth Sci.

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Earth's continental crust has grown and been recycled throughout geologic history along convergent plate margins. The main locus of continental crustal growth is in intra-oceanic and continental-margin arc systems in Archean time. In arc systems, oceanic lithosphere is subducted to the deeper mantle, and together with its overlying sedimentary sequence is in some cases off-scraped to form accretionary prisms. Fluids are released from the subducting slab to chemically react with the mantle wedge, forming mafic-ultramafic metasomatites, whose partial melting generates mafic melts that rise up to form arcs. In intraoceanic arcs, they produce dominantly basaltic lavas, with a mid-crust that includes variably-developed vertically-walled intermediate plutons and higher-level dikes and sills. In continental-margin arcs, different petrogenetic processes cause assimilation and fractionation of basaltic magmas, partial melting/reworking of juvenile basaltic rocks, and mixing of mantle-and crust-derived melts, so they produce andesitic calc-alkaline melts but still have a mid-crust dominated by vertically-walled felsic plutons, which form 3-D dome-and-basin structures, akin to those in some Archean terranes such as parts of the Pilbara and Zimbabwe cratons. Notably, the continental crust of Archean times is dominated by tonalite-trondhjemite-granodiorite (TTG) plutons, similar to that of the mid-crust of these arc systems, suggesting that early continental crust may have formed largely by the amalgamation of multiple arc systems. The patterns of magmatism, in terms of petrogenesis, rock types, duration of magmatic and accretionary events, and the spatial scales of deformation and magmatism have remained essentially the same throughout geological history, demonstrating that plate tectonic processes characterized by subduction and arc magmatism have been in operation at least as long as recorded by the preserved geologic record, since the Eoarchean. However, the early Earth was dominated by accretionary orogens and oceanic arcs, that gradually grew thicker through multiple accretion events to form early continental-margin arcs by 3.5-3.2 Ga, and accretionary orogens. Slab melting and warmer metamorphism was more common in Archean arc systems due to higher mantle temperatures. These early arcs were further amalgamated into large emergent continents by ~3.2-3.0 Ga, allowing large-scale processes such as lithospheric rifting and continental collisions, and the start of the supercontinent cycle. Further work should apply the null hypothesis, that plate tectonics explains the geologic record, to test for differences in the style of plate tectonics and magmatism through time, based on the fundamental difference in planetary heat production and the evolution of rotational dynamics of the Earth-Sun-Moon system.

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Middle to Late Ordovician flare‐up of granitoids, South Altyn Tagh: Reworking of exhumed continental crust

Zhou,

Zhao,

Yao

et al. 2024

Geological Journal

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A flare‐up of granitoids occurred at 465–445 Ma in the South Altyn Tagh, synchronously with the exhumation of subducted continental crust. Nevertheless, it remains enigmatic whether a petrogenetic connection exists between them. Here, we report a 454–451 Ma monzogranite pluton, which is characterized by abundant inherited zircons, located in the northern margin of the South Altyn Tagh high‐pressure (HP)—ultrahigh‐pressure (UHP) metamorphic terrane. U–Pb ages and Hf–O isotopic compositions of inherited and synmagmatic zircons are investigated to trace the source rocks and petrogenesis of this pluton. The inherited zircons (zircons that predate the magmatism) exhibit a wide range of ages from 2618 to 484 Ma, displaying three major peaks at 1800–1100 Ma, 1000–800 Ma and 500 Ma. By comparing these inheritance age patterns with zircon spectra of main (meta‐)sedimentary sequences and the widespread Early Neoproterozoic granites (presently as granitic gneisses) in South Altyn Tagh, along with zircon εHf(t) and whole‐rock Nd isotopic composition, we argue that the main source rocks of the studied monzogranite are Early Neoproterozoic granitic gneisses and Late Mesoproterozoic paragneisses from the South Altyn Tagh HP–UHP metamorphic terrane. The ca. 500 Ma inherited zircons have a metamorphic origin, which is simultaneous with the peak metamorphic ages of HP–UHP metamorphic rocks in the Altyn Tagh Complex. These observations indicate that the source rocks of the monzogranite pluton are the subducted continental crust, which underwent metamorphism at ca. 500 Ma and followed by partial melting at 454–451 Ma. In addition, synmagmatic zircons exhibit variable δ18O and εHf(t) values ranging from 5.4 to 11.7‰ and from −19 to +10.3, respectively, indicating a minor contribution of mantle‐derived melts in the formation of the monzogranite. Given the studied pluton and contemporaneous extensive granitoids (465–445 Ma), characterized by similar geochemistry and source rocks, are synchronous with the final exhumation of subducted South Altyn Tagh continental crust, we propose that the reworking of exhumed continental crust at middle to lower crustal depths is their main petrogenesis.

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The production of granitic magmas through crustal anatexis at convergent plate boundaries

Cited by 51 publications

References 245 publications

Leucogranite Records Multiple Collisional Orogenies

Leucogranite Records Multiple Collisional Orogenies

Growth of continental crust in intra-oceanic and continental-margin arc systems: Analogs for Archean systems

Middle to Late Ordovician flare‐up of granitoids, South Altyn Tagh: Reworking of exhumed continental crust

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