&lt;sup&gt;40&lt;/sup&gt;Ar/&lt;sup&gt;39&lt;/sup&gt;Ar thermochronology of the Sulu terrane: Late Triassic exhumation of high- and ultrahigh-pressure rocks and implications for Mesozoic tectonics in East Asia

Webb, Laura E.; Leech, M. L.; Yang, Tinglu

doi:10.1130/2006.2403(04)

Cited by 18 publications

(20 citation statements)

References 38 publications

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“…A large number of 40 Ar/ 39 Ar ages indicate that closure to Ar began throughout Sulu by 219 Ma: hornblende ages are 212.9 ± 1.3 Ma (Webb et al. , 2006) and 213.7 ± 2 Ma (Li et al.…”

Section: Discussionmentioning

confidence: 99%

⁴⁰Ar/³⁹Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

Hacker

Wallis

McWilliams

et al. 2009

Journal Metamorphic Geology

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New 40Ar ⁄ 39Ar ages are presented from the giant Sulu ultrahigh-pressure (UHP) terrane and surrounding areas. Combined with U-Pb ages, Sm-Nd ages, Rb-Sr ages, inclusion relationships, and geological relationships, they help define the orogenic events before, during and after the Triassic collision between the Sino-Korean and Yangtze Cratons. In the Qinling microcontinent, tectonism occurred between 2.0 and 1.4 Ga. The UHP metamorphism occurred in the Yangtze Craton between 240 and 222 Ma; its thermal effect on the Qinling microcontinent was limited to partial resetting of K-feldspar 40 Ar ⁄ 39 Ar ages. Subsequent unroofing at rates of 5-25 km Myr )1 brought the UHP terrane to crustal levels where it underwent a relatively short amphibolite facies metamorphism. The end of that metamorphism is marked by 40 Ar ⁄ 39Ar ages in the 219-210 Ma range, implying cooling at crustal depths at rates of 50-200°C Myr )1 . Ages in the 210-170 Ma range may reflect protracted cooling or partial resetting by Jurassic or Cretaceous magmatism. Jurassic 166-149 Ma plutonism was followed by cooling at rates of c. 15°C Myr )1 , suggesting relatively deep crustal conditions, whereas Cretaceous 129-118 Ma plutonism was succeeded by cooling at rates of c. 50 C Myr )1 , suggesting relatively shallow crustal depths.

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“…A large number of 40 Ar/ 39 Ar ages indicate that closure to Ar began throughout Sulu by 219 Ma: hornblende ages are 212.9 ± 1.3 Ma (Webb et al. , 2006) and 213.7 ± 2 Ma (Li et al.…”

Section: Discussionmentioning

confidence: 99%

⁴⁰Ar/³⁹Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

Hacker

Wallis

McWilliams

et al. 2009

Journal Metamorphic Geology

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“…4B). Leech et al (2006b) demonstrate that U-Pb ages on different zircons from the same area, but lacking UHP index mineral inclusions, record the same span of ages for peak and retrograde zircon growth as described by Liu et al (2004); 40 Ar/ 39 Ar dating records retrograde metamorphism in the same rocks (Webb et al, 2006). Similar examples of continuous metamorphic zircon growth are seen in UHP rocks from eastern Greenland (McClelland et al, in press) and the Ural Mountains, Russia (Beane and Leech, in press).…”

Section: Continuous Metamorphic Zircon Growthmentioning

confidence: 80%

Continuous Metamorphic Zircon Growth and Interpretation of U-Pb SHRIMP Dating: An Example from the Western Himalaya

Leech

Singh

Jain

2007

International Geology Review

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Ultrahigh-pressure (UHP) rocks in the northwest Himalaya are some of the youngest on earth, and allow testing of critical questions of UHP metamorphism and exhumation and the India-Asia collision. The Tso Morari Complex (TMC) is a UHP subduction-zone complex in eastern Ladakh in the western Himalaya, south of the Indus-Yarlung suture zone. U-Pb SHRIMP dating of zircon shows the TMC has a Proterozoic protolith, preserves a Pan-African magmatic history, and shows continuous metamorphic zircon growth during the Early to Middle Eocene, hence constraining the timing of collision, subduction, and exhumation in the western Himalaya. Zircon dating indicates that UHP metamorphism occurred at 53.3 ± 0.7 Ma, followed by 8 m.y. of continual zircon crystallization to amphibolite-facies metamorphic conditions at 45.2 ± 0.7 Ma. Similar continuous zircon growth during UHP metamorphism and through early exhumation to amphibolite-facies conditions occurs in other UHP subduction complexes, including the Sulu terrane, where coesite-bearing inclusions within dated zircon prove conclusively that zircon dates record UHP metamorphism. U-Pb SHRIMP dating of zircon for both the TMC and the Sulu belt demonstrate that zircon continues to crystallize at temperatures 400° ± 50°C based on 40 Ar/ 39 Ar dating yielding the same ages.

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“…The earlier magmatic episode took place at 145-130 Ma, accompanying varying degrees of structural deformation; the later episode occurred at 130-120 Ma, without considerable deformation (Zheng, 2008 and the references there in). The geochronological investigations indicate a similar time frame of deformation for Early Cretaceous extension in the Sulu region and along the Tan-Lu fault zone (Webb et al, 2006;Zhu et al, 2010), although a dome unit similar to the Tongbai and northern Dabie complexes did not occur in the Sulu region. This suggests the evolution of the Tongbai-Dabie-Sulu orogen within the same extensional tectonic regime during the Early Cretaceous.…”

Section: Regional Implicationsmentioning

confidence: 91%

“…90 Ma obtained for K-feldspar from the Dabie HP/UHP terrane have been interpreted as a record of a regional thermal overprint (Ratschbacher et al, , 2006. Furthermore, similar and slightly younger ages of 93-81 Ma were also obtained, using KAr and 40 Ar/ 39 Ar step heating techniques, for pseudotachylite veins from the Dabie and Sulu terranes (Liu et al, 2004c;Webb et al, 2006). Therefore, we infer that this Late Cretaceous thermal event may be associated with ductile-brittle deformation mostly alone the large-scale boundary faults during the late stage.…”

Section: Regional Implicationsmentioning

confidence: 98%

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U–Pb and 40Ar/39Ar geochronology of the Tongbai complex, central China: Implications for Cretaceous exhumation and lateral extrusion of the Tongbai–Dabie HP/UHP terrane

Cui

Liu

Dong

et al. 2012

Journal of Asian Earth Sciences

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<sup>40</sup>Ar/<sup>39</sup>Ar thermochronology of the Sulu terrane: Late Triassic exhumation of high- and ultrahigh-pressure rocks and implications for Mesozoic tectonics in East Asia

Cited by 18 publications

References 38 publications

⁴⁰Ar/³⁹Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

⁴⁰Ar/³⁹Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

Continuous Metamorphic Zircon Growth and Interpretation of U-Pb SHRIMP Dating: An Example from the Western Himalaya

U–Pb and 40Ar/39Ar geochronology of the Tongbai complex, central China: Implications for Cretaceous exhumation and lateral extrusion of the Tongbai–Dabie HP/UHP terrane

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<sup>40</sup>Ar/<sup>39</sup>Ar thermochronology of the Sulu terrane: Late Triassic exhumation of high- and ultrahigh-pressure rocks and implications for Mesozoic tectonics in East Asia

Cited by 18 publications

References 38 publications

40Ar/39Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

40Ar/39Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

Continuous Metamorphic Zircon Growth and Interpretation of U-Pb SHRIMP Dating: An Example from the Western Himalaya

U–Pb and 40Ar/39Ar geochronology of the Tongbai complex, central China: Implications for Cretaceous exhumation and lateral extrusion of the Tongbai–Dabie HP/UHP terrane

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⁴⁰Ar/³⁹Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen

⁴⁰Ar/³⁹Ar Constraints on the tectonic history and architecture of the ultrahigh‐pressure Sulu orogen