Late Jurassic I-type rhyolites from the Duobuza region, north-central Tibet: evidence for the occurrence of juvenile lower crust and crustal growth in the Southern Qiangtang Terrane

Dong, Yanhui; Wang, Ming; Fan, Jian‐Jun; Xie, Chao-Ming; Yu, Yunpeng; Hao, Yujie

doi:10.1080/00206814.2019.1647470

Cited by 4 publications

(3 citation statements)

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“…(d) Zircon delta 18 O versus ages. Data source from Li, He, et al (2016); Li, Zhu, et al (2016), Hao et al (2016), Wu et al (2016), Fan et al (2016), and Dong et al (2019) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

“…Abundant Jurassic arc‐type granitoids, associated with northward subduction of BNTO, were developed in the SQT, especially in the northern Gaize and Kangqiong areas (Dong et al, 2019; Fan et al, 2016; Hao et al, 2016a; Li, Zhu, et al, 2014; Wu, Li, Yu, & Chen, 2018; Yang et al, 2015; Figure 1b). These magmatic activities suddenly weakened during the Late Jurassic and then resurged during the Early Cretaceous, with an obvious magmatic gap (ca.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The Banggong‐Nujiang Tethys Ocean (BNTO) is located between the Southern Qiangtang Terrane (SQT) and the Northern Lhasa Terrane (NLT) during the Mesozoic (Pan et al, 2012; Zhu et al, 2013). The BNTO subducted northwards under the SQT during the Middle‐Late Jurassic, with synchronous emplacement of voluminous magmatic rocks into the SQT (Dong et al, 2019; Li, Zhu, et al, 2014; Li, He, et al, 2016; Li, Zhu, et al, 2016; Wu et al, 2016; Yu et al, 2020). A magmatic gap has been identified within the SQT from Late Jurassic to Early Cretaceous (ca.…”

Section: Introductionmentioning

confidence: 99%

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Magmatic gap associated with stepwise arc‐continent collision during the subduction of Banggong‐Nujiang Tethys Ocean: Evidence from Late Jurassic bimodal magmas

et al. 2020

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The magmatic suites in the southern margin of South Qiangtang Terrane (SQT) provide important clues to the process of northward subduction of the Banggong‐Nujiang Tethys Ocean (BNTO) and its geodynamic evolution. Previous studies identified a magmatic gap from Late Jurassic to Early Cretaceous (ca. 150–130 Ma) in the southern margin of SQT. Although the gap is generally correlated with the process related to BNTO subduction, the previous models on this remain equivocal. In this study, we investigated a suite of bimodal magmatic rocks newly recognized in the Rigenco area of SQT, including gabbros and granodiorites which were dated at 151.7 ± 3.8 Ma and 150.0 ± 2.0 Ma respectively. Based on geochemical and isotopic analyses, it is inferred that the gabbroic magmas were derived from a sub‐arc mantle source enriched by metasomatism of voluminous slab‐derived and crustal compositions, and that the granodiorites were derived from sub‐arc juvenile lower crust. Combining the petrogenesis of gabbros and granodiorites, it is proposed that the bimodal magmas were produced under a tectonic setting of general compression with local extension. A detailed evaluation of the tectonic setting of the magmatic bimodal suite suggests crustal thickening at ca. 150 Ma and that the BNTO involved multiple arcs and sub‐basins. A new model of arc‐SQT collision is proposed to account for the magmatic gap which commenced at ca. 150 Ma. The model of arc–continent collision in this case can well explain the present distribution and occurrence of magmatic rocks of late Jurassic age in the southern margin of the SQT, especially the magmatic gap. Our discovery of Late Jurassic bimodal rocks provides a critical evidence for step‐wise arc–continent collision during BNTO subduction, and contributes to the understanding of the magmatic gap in SQT and the evolution of BNTO.

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