Underplating of basaltic magmas and crustal growth in a continental arc: Evidence from Late Mesozoic intermediate–felsic intrusive rocks in southern Qiangtang, central Tibet

Hao, Lu; Wang, Qiang; Wyman, Derek A.; Ou, Qingyu; Wei, Dan; Jiang, Zhongliang; Wu, Fu Yuan; Yang, Jin‐Hui; Long, Xiaoping; Li, Jie

doi:10.1016/j.lithos.2015.09.015

Cited by 131 publications

(71 citation statements)

References 106 publications

(251 reference statements)

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“…The Bizha dioritic rocks show εNd(t) values ranging from −0.01 to −3.31 and initial 87 Sr/ 86 Sr isotopic ratios ranging from 0.7053 to 0.7062 (Figure a). These Sr‐Nd isotope compositions are similar to those of the Early Cretaceous magmatic rocks [ Hao et al ., ; Li et al ., ; D. Liu et al ., ; S. Liu et al ., ], but contrast with those of the Late Jurassic magmatic rocks, which have high initial 87 Sr/ 86 Sr (> 0.7065) and low εNd(t) values (−3 to −8) [ Hao et al ., ; D. Liu et al ., ; Zhang et al ., , and references therein.) (Figure a).…”

Section: Resultsmentioning

confidence: 99%

“…(f) Simple mixing modeling results of the most depleted basaltic andesite [ Li et al ., ] and the lower crust. The lower crust compositions are represented by the northern Gerze granodiorites with the most enriched Sr‐Nd [ Hao et al ., ] and the Amdo orthogneiss [ Harrison et al ., ]. (g) La/Yb versus La (ppm).…”

Section: Discussionmentioning

confidence: 99%

“…In the Gerze area, the Rena Co plutons mainly consists of Late Jurassic (∼150 Ma) granodiorites and diorites and Early Cretaceous (∼112 Ma) granodiorite porphyries [ Hao et al ., ]. Andesites and rhyolites in the area have been dated between 124 and 105 Ma [e.g., Kapp et al ., ; S. Liu et al ., ].…”

Section: Geological Setting and Rock Characteristicsmentioning

confidence: 99%

“…Hao et al . [] tracked the sources of late‐Mesozoic felsic rocks in southern Qiangtang (between the Bangong Co and Dongqiao areas) and suggested that vertical crustal growth occurred in the area by magma underplating in a continental arc setting. The nature of the underplated magmas, however, remains unknown.…”

Section: Introductionmentioning

confidence: 99%

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Andesitic crustal growth via mélange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet

Hao

Wang

Wyman

et al. 2016

Geochem. Geophys. Geosyst.

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Deciphering the petrogenesis of andesitic/dioritic rocks is fundamental to understanding the formation of the continental crust. Here we present detailed petrology, geochronology, major and trace element, Sr-Nd-Hf-O isotope data for the Early Cretaceous (122 Ma) dioritic rocks in the Bizha area in southern Qiangtang, Tibet. The dioritic rocks are characterized by large ion lithophile elements, Pb, and light rare earth elements but depletion of high field strength elements with slightly enriched and variable eNd (t)

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Geological Setting and Rock Characteristicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Andesitic crustal growth via mélange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet

Hao

Wang

Wyman

et al. 2016

Geochem. Geophys. Geosyst.

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“…Zhang et al (2014) and X.Z. Zhang et al (2014), Granitoids in Larelaxin from Liu et al (2014), Granitoids in Central Qiangtang from Zhai et al (2013) and Li et al (2015), Granitoids in Rena Co from Hao et al (2015) and Granitoids in Kangqiong from Li et al (2015). high-Mg diorites.…”

Section: High-mg Dioritementioning

confidence: 99%

Middle Jurassic MORB-type gabbro, high-Mg diorite, calc-alkaline diorite and granodiorite in the Ando area, central Tibet: Evidence for a slab roll-back of the Bangong-Nujiang Ocean

Yan

Long

Wang

et al. 2016

Lithos

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Sediment melting during subduction initiation: Geochronological and geochemical evidence from the Darutso high‐Mg andesites within ophiolite melange, central Tibet

Zeng

Chen

et al. 2016

Geochem Geophys Geosyst

111

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In addition to fluids, the concept of sediment‐derived melts infiltrating the fore‐arc mantle during subduction initiation has been proposed based on studies of modern subduction zones and ophiolite mélange. However, outcrops that contain the products of such melts are rare, especially in conjunction with boninite. New U‐Pb zircon dating reveals that the Darutso volcanic rocks (DVRs) within ophiolitic mélange in the Beila area, central Tibet, crystallized at ∼164–162 Ma. This is the first recognition of Jurassic volcanic rocks in the middle section of the Bangong‐Nujiang Suture Zone. Geochemically, the DVRs are high‐Mg andesites with moderate SiO2 (59.03–63.62 wt %) and high MgO (3.74–6.53 wt %), Cr (up to 395 ppm), and Mg# (50.3–67.9). They also have high Th contents, (La/Sm)N ratios, and (87Sr/86Sr)i values (0.7085–0.7147); low Ba/Th, U/Th, and Sr/Y ratios; and negative values of εNd(t) (−8.7 to −9.8) and zircon εHf(t) (−7.4 to −9.9). The εNd(t) values of the DVRs overlap those of regional sediments. Detailed analyses of these geochemical characteristics indicate that the DVRs were derived from partial melting of subducted sediments and subsequent interaction with overlying mantle peridotite in a shallow and hot setting. In combination with the regional geology, in particular adjacent ophiolites that contain MORB‐like and boninite mafic lavas, these rocks collectively recorded the evolution of a fore‐arc setting during the initiation of the northward subduction of the south branch of the Bangong‐Nujiang Ocean. Therefore, the results provide direct evidence for sediment melting during subduction initiation and constrain the Jurassic tectonic evolution of the Lhasa terrane.

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Underplating of basaltic magmas and crustal growth in a continental arc: Evidence from Late Mesozoic intermediate–felsic intrusive rocks in southern Qiangtang, central Tibet

Cited by 131 publications

References 106 publications

Andesitic crustal growth via mélange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet

Andesitic crustal growth via mélange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet

Middle Jurassic MORB-type gabbro, high-Mg diorite, calc-alkaline diorite and granodiorite in the Ando area, central Tibet: Evidence for a slab roll-back of the Bangong-Nujiang Ocean

Sediment melting during subduction initiation: Geochronological and geochemical evidence from the Darutso high‐Mg andesites within ophiolite melange, central Tibet

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