Old continental zircons from a young oceanic arc, eastern Taiwan: Implications for Luzon subduction initiation and Asian accretionary orogeny

Shao, Wen-Yu; Chung, Sun‐Lin; Chen, Wen Shan; Lee, Hao‐Yang; Xie, Lie‐Wen

doi:10.1130/g36499.1

Cited by 75 publications

(75 citation statements)

References 15 publications

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“…Older detrital zircons include 10 out of 114 grains analyzed (~9%) from Lutao and 46 out of 80 grains (~58%) from Lanyu (Tables 3 and 4). Abundant inherited zircons of Yanshanian/Indosinian and older ages have also been obtained for volcanic samples from the Chimei complex and elsewhere along the Coastal Range (Shao et al 2011(Shao et al , 2012. We therefore argue this to be a general feature for the entire northern Luzon arc that, as addressed by Shao et al (2011Shao et al ( , 2012, is an intra-oceanic arc terrane containing or underlain with a "hidden" continental fragment.…”

Section: Significance Of Abundant Old Zirconsmentioning

confidence: 80%

“…Abundant inherited zircons of Yanshanian/Indosinian and older ages have also been obtained for volcanic samples from the Chimei complex and elsewhere along the Coastal Range (Shao et al 2011(Shao et al , 2012. We therefore argue this to be a general feature for the entire northern Luzon arc that, as addressed by Shao et al (2011Shao et al ( , 2012, is an intra-oceanic arc terrane containing or underlain with a "hidden" continental fragment. Such a continental fragment was rifted from the South China Block during opening of the South China Sea and accreted to the western margin of the Philippine Sea, thus initiating eastward subduction of the South China Sea plate under the Philippine Sea plate to form the northern Luzon arc system.…”

Section: Significance Of Abundant Old Zirconsmentioning

confidence: 80%

“…13), i.e., (1) Lutao, with U ranging from 175 -4979 ppm ( Table 3) that yields an average of 909 ppm (n = 293), and (2) Lanyu, ranging from 114 -2036 ppm (Table 4) and an average of 417 ppm (n = 41) both of which are obviously higher than the U concentrations of magmatic zircons from the Coastal Range (Shao et al 2011(Shao et al , 2012. The latter, ranging largely from ~20 to 200 ppm (Fig.…”

Section: Higher U In Younger Magmatic Zirconsmentioning

confidence: 99%

“…This line of age information echoes the evolutionary model proposed for the northern Luzon arc system (Lai and Song 2013) wherein each volcano group from the Coastal Range to Lutao has its own life span with concomitant changes in lithofacies and geochemical characteristics. The Miocene stages, if existed in Lanyu, correspond to our unpublished zircon U-Pb age results from the Coastal Range, where a cluster of inherited zircons dated ~15 Ma from the Chimei igneous complex and zircon mean ages of volcanic rocks from ~9.2 to 6.5 Ma have been observed (Shao et al 2011(Shao et al , 2012. In addition, the youngest zircon U-Pb age obtained so far is ~4.5 Ma, recorded by several grains of magmatic zircons from the Shihtiping white tuff (Shao et al unpubl.…”

Section: Significance Of Zircon U-pb Ages From Lanyumentioning

confidence: 99%

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Zircon U-Pb Age Determination of Volcanic Eruptions in Lutao and Lanyu in the Northern Luzon Magmatic Arc

Shao¹,

Chung²,

Chen³

2014

Terr. Atmos. Ocean. Sci.

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This paper reports for the first time zircon U-Pb ages of volcanic rocks and sands from Lutao and Lanyu, two islets off SE Taiwan in the north Luzon arc. The samples include (1) seven andesites from four volcanic units and three river/beach sands from Lutao and (2) five basaltic andesites from four volcanic units and two river/beach sands from Lanyu. The Lutao andesites contain abundant magmatic zircons, aging from ~1.54 to ~1.24 Ma for individual sample, which yielded an overall mean U age of 2.69 ± 0.11 Ma (n = 34, MSWD = 4.7) obtained by detrital zircons from the two sands. The age data suggest that in Lutao and Lanyu the major volcanic eruptions occurred at ~1.3 and ~2.6 Ma, respectively. Moreover, volcanic samples from both islets contain various amounts of older inherited zircons, ~11% in Lutao and up to ~82% in Lanyu, which together with detrital zircons from the sands show main age peaks at ~150 Ma and ~1.9 and ~2.5 Ga, consistent with the notion for a "hidden" continental crust involved in the genesis of the northern Luzon magmatic arc.

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Section: Significance Of Abundant Old Zirconsmentioning

confidence: 80%

Section: Significance Of Abundant Old Zirconsmentioning

confidence: 80%

Section: Higher U In Younger Magmatic Zirconsmentioning

confidence: 99%

Section: Significance Of Zircon U-pb Ages From Lanyumentioning

confidence: 99%

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Zircon U-Pb Age Determination of Volcanic Eruptions in Lutao and Lanyu in the Northern Luzon Magmatic Arc

Shao¹,

Chung²,

Chen³

2014

Terr. Atmos. Ocean. Sci.

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“…New data from blocks of blueschist have zircon U‐Pb ages of 16.0 ± 0.2~15.4 ± 0.4 Ma, consistent with the zircon U‐Pb age of 14.1 ± 0.4 Ma of initial volcanic arc construction in the Coastal Range. This Miocene arc is thought to represent the initial subduction of the South China Sea oceanic crust [ Shao et al ., ] (Figure a). Our results along with data from previous studies regarding the metamorphic temperature/pressure and cooling ages of the Yuli belt interpret these metamorphic rocks to have formed at deeper levels in subduction zone and then underwent metamorphism during the middle‐late Miocene (Figures b, a, and b).…”

Section: Discussionmentioning

confidence: 99%

A reinterpretation of the metamorphic Yuli belt: Evidence for a middle-late Miocene accretionary prism in eastern Taiwan

Chen

Chung

Chou³

et al. 2017

Tectonics

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The Yuli metamorphic belt has been the topic of petrological and geochronological studies for over 40 years and has been interpreted as a Cretaceous mélange. Our study utilizes zircon U‐Pb dating of schist and exotic blueschist blocks in the Yuli belt. These new ages indicate that these metamorphic rocks are actually middle Miocene in age and may represent the deeper structural levels of an accretionary prism. Several distinctive detrital zircon U‐Pb age populations are recognized from 14 siliceous schists of mélange‐hosted rocks that are similar in age population to the Cretaceous, Eocene‐Oligocene, and Miocene strata of Taiwan. The wide range of ages is interpreted as a product mixing of various sedimentary strata prior to metamorphism. Three blueschists of a volcanic‐arc protolith enclosed within the host rocks yield crystallization ages of 15.4 ± 0.4, 15.5 ± 0.3, and 16.0 ± 0.2 Ma based on zircon U‐Pb dating. In consideration of the new data regarding the Cretaceous‐Miocene host rocks and the middle Miocene exotic blueschist blocks, it strongly suggests that the Yuli belt formed at deeper levels of an accretionary wedge during subduction of South China Sea oceanic crust at the middle‐late Miocene. Subsequently, the rapid uplift of the metamorphic belt was probably related to doubly vergent wedge extrusion due to the Pliocene arc‐continent collision.

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Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian‐Nubian Shield, Egypt

El‐Rahman

Anbar

et al. 2018

Geophysical Research Letters

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The Neoproterozoic Arabian‐Nubian Shield (ANS) is the best preserved and the largest exposed Neoproterozoic juvenile crust on Earth. While the lithology and early Sr and Nd isotopic data demonstrate that the ANS crust is overwhelmingly juvenile, pre‐ANS old zircon crystals have been increasingly recognized in the ANS igneous and sedimentary rocks, casting doubt on the “juvenility” of the ANS crust. In order to understand the origin of the old continental materials in the ANS and its roles in generation of juvenile oceanic arcs, we carry out for the first time an integrated in situ analysis of zircon U‐Pb age and Hf‐O isotopes for greywacke and felsic volcanic cobble samples from the Atud Formation in the Eastern Desert of northwestern part of the ANS. Our data indicate that the Atud Formation was deposited between ca. 720 and 700 Ma, concurrent with the production of oceanic arcs in the ANS. The Atud greywacke was derived from the erosion of a proximal arc terrane that contains numerous old continental crust materials. We identify for the first time a 755‐Ma felsic volcanic cobble from the Atud Formation that is derived from old continental materials during juvenile crust production, suggesting presence of an old continental crust substrate that underlies the ANS. Our work demonstrates that reworking of old continental crust played important roles in generation of oceanic arcs in the northwestern ANS that is likely much less juvenile than previously thought. Thus, the crustal growth rates calculated based on estimates of temporal island arc development need to be revised.

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Old continental zircons from a young oceanic arc, eastern Taiwan: Implications for Luzon subduction initiation and Asian accretionary orogeny

Cited by 75 publications

References 15 publications

Zircon U-Pb Age Determination of Volcanic Eruptions in Lutao and Lanyu in the Northern Luzon Magmatic Arc

Zircon U-Pb Age Determination of Volcanic Eruptions in Lutao and Lanyu in the Northern Luzon Magmatic Arc

A reinterpretation of the metamorphic Yuli belt: Evidence for a middle-late Miocene accretionary prism in eastern Taiwan

Old Continental Crust Underlying Juvenile Oceanic Arc: Evidence From Northern Arabian‐Nubian Shield, Egypt

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