Continental crust formation at arcs, the arclogite “delamination” cycle, and one origin for fertile melting anomalies in the mantle

Lee, Cin-Ty A.; Anderson, Don L.

doi:10.1007/s11434-015-0828-6

Cited by 98 publications

(61 citation statements)

References 121 publications

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“…An indirect line of evidence for a thick southwestern Tian Shan crust is the corroborative igneous‐ and detrital‐zircon Hf pull‐up from intermediate–evolved to juvenile values subsequent to the end of Gissar‐arc magmatism at ~288–286 Ma (Figure ), which indicates a rapid shift from an evolved/crust‐derived to a juvenile/mantle‐derived melt source at this time. We interpret this change in melt source to indicate asthenospheric upwelling due to lithospheric foundering (Figures and ) [e.g., Zandt et al , ], which implies the prior existence of a crust that was thick enough for its root to have densified beyond a gravitational steady state via the formation of an “arclogite” root [e.g., Lee and Anderson , ]. This thick crust apparently developed over ~10–15 Myr, subsequent to the onset of formation of the Turkestan and Gissar sutures and the Karakum‐Tarim‐Kazakh‐Kyrgyz continental collision in the southwestern Tian Shan.…”

Section: Discussionmentioning

confidence: 99%

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

et al. 2017

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The amalgamation of the Central Asian Orogenic Belt in the southwestern Tian Shan in Tajikistan is represented by tectono‐magmatic‐metamorphic processes that accompanied late Paleozoic ocean closure and collision between the Karakum‐Tarim and Kazakh‐Kyrgyz terranes. Integrated U‐Pb geochronology, thermobarometry, pseudosection modeling, and Hf geochemistry constrain the timing and petro‐tectonic nature of these processes. The Gissar batholith and the Garm massif represent an eastward, along‐strike increase in paleodepth from upper‐batholith (~21–7 km) to arc‐root (~36–19 km) levels of the Andean–syn‐collisional Gissar arc, which developed from ~323–288 Ma in two stages: (i) Andean, I‐type granitoid magmatism from ~323–306 Ma due to northward subduction of the Gissar back‐arc ocean basin under the Gissar microcontinent, which was immediately followed by (ii) syn‐collisional, I‐S‐type granitoid magmatism in the Gissar batholith and the Garm massif from ~304–288 Ma due to northward subduction/underthrusting of Karakum marginal‐continental crust under the Gissar microcontinent. A rapid isotopic pull‐up from ~288–286 Ma signals the onset of juvenile, alkaline‐syenitic, post‐collisional magmatism by ~280 Ma, which was driven by delamination of the Gissar arclogite root and consequent convective asthenospheric upwelling. Whereas M–HT/LP prograde metamorphism in the Garm massif (650–750°C/6–7 kbar) from ~310–288 Ma was associated with subduction‐magma inundation and crustal thickening, HT/LP heating and decompression to peak‐metamorphic temperatures (~800–820°C/6–4 kbar) at ~288 ± 6 Ma was driven by the transmission of a post‐collisional, mantle‐derived heat wave through the Garm‐massif crust.

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Section: Discussionmentioning

confidence: 99%

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

et al. 2017

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“…As shown in Figure , andesites are enriched in LILEs and LREEs and U and Th, and relatively depleted in HFSEs (such as Nb, Ta, P, and Ti), showing enriched Sr–Nd–Pb isotope compositions. There are four possible interpretations for achieving these geochemical features: (a) mixing between supracrustal melts and mantle‐derived melts, (b) partial melting of an ancient mafic lower crust, (c) a mantle wedge metasomatized by fluids or melts derived from the subducting oceanic plate slab, and (d) originating from a long‐term evolved lithospheric mantle (Huang et al, ; Lee & Anderson, ; X. L. Wang, Jiang, & Dai, ).…”

Section: Discussionmentioning

confidence: 99%

The geochronologic and geochemical constraints on the Early Cretaceous subduction magmatism in the central Lhasa subterrane, Tibet

et al. 2017

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A large volume of Early Cretaceous volcanic rocks are exposed in the central Lhasa subterrane, which are essential for models developed for understanding the evolution of Lhasa Terrane. However, the petrogenesis and geodynamic background of these rocks are still in debate. In this paper, we carried out a detailed study on the volcanic rocks of the Zenong Group, including andesite, dacite, and rhyolite from the Coqen area in the central Lhasa subterrane. Zircons from one dacitic tuff yields an age of 115.3 ± 1.1 Ma. All the rocks are enriched in light rare earth elements (LREEs), Th, U, and Pb and depleted in high field strength elements (HFSEs, e.g. Nb, Ta, P, and Ti). The dacite and rhyolite samples are high‐K calc‐alkaline to shoshonitic and are metaluminous to peraluminous. These felsic samples are characterized by negative ƐNd(t) (−8.9 to −2.1) and ƐHf(t) (−8.1 to −5.6) and have high radiogenic Pb isotopic composition (206Pb/204Pb = 18.6287–19.5578, 207Pb/204Pb = 15.7161–15.7720, and 208Pb/204Pb = 39.1440–40.6253). Particularly, a negative correlation between the ƐNd(t) values and SiO2 contents can be observed in these dacites and rhyolites. Meanwhile, the andesites exhibit similar Sr–Nd–Pb isotopic compositions to dacites and rhyolites (ƐNd(t) = −4.3; 206Pb/204Pb = 18.7119–18.8575, 207Pb/204Pb = 15.7159–15.7203, and 208Pb/204Pb = 39.2944–39.6036). Our new data indicate that different geochemical reservoirs are involved in generating the ca. 115 Ma magmatism in the central Lhasa subterrane. It is likely that dacites and rhyolites are derived from the magma mixing between the ancient basement‐derived melts and mantle‐derived melts with varying degrees of partial melting. The andesites might originate from partial melting of an ancient lithospheric mantle that have been metasomatized by fluids and/or melts derived from the Tethyan oceanic slab. Our results, together with recent studies, suggest that the Zenong Group volcanic rocks in the Coqen area may represent the magmatic responses to the break‐off of the southward subduction of the Bangong–Nujiang Tethyan oceanic slab.

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“…As an inevitable process during crust accretion-related magmatism, crust-mantle interaction has been the subject of much research. Models have been proposed to characterize crust-mantle interaction such as "underplating", "delamination", "convective removal", "tectonic erosion" (Bergantz, 1989;Clift et al, 2009;Conrad and Molnar, 1997;Kay and Kay, 1993;Lee, 2012;Lee and Anderson, 2015). All these are probable processes, but details of these processes need better understanding.…”

Section: Introductionmentioning

confidence: 99%

Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau: A case for crust–mantle interaction

Niu

et al. 2016

Lithos

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(2016) 'Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau : a case for crustmantle interaction. ', Lithos., Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D

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Continental crust formation at arcs, the arclogite “delamination” cycle, and one origin for fertile melting anomalies in the mantle

Cited by 98 publications

References 121 publications

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

Birth, life, and demise of the Andean–syn‐collisional Gissar arc: Late Paleozoic tectono‐magmatic‐metamorphic evolution of the southwestern Tian Shan, Tajikistan

The geochronologic and geochemical constraints on the Early Cretaceous subduction magmatism in the central Lhasa subterrane, Tibet

Origin of the late Early Cretaceous granodiorite and associated dioritic dikes in the Hongqilafu pluton, northwestern Tibetan Plateau: A case for crust–mantle interaction

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