Geochronology and geochemistry of metamorphic rocks in the Jiaobei terrane: Constraints on its tectonic affinity in the Sulu orogen

Tang, Jun; Zheng, Yong‐Fei; Wu, Yuan–Bao; Gong, Bing; Liu, Xiaoming

doi:10.1016/j.precamres.2006.09.001

Cited by 262 publications

(116 citation statements)

References 123 publications

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“…In addition, there is a small amount of Archean crust that crops out mainly in Kongling region of the Yangtze Gorge [66,67] . So far no mid-Neoproterozoic magmatism has been observed in the North China Block [68] . Therefore, the occurrence of the magmatic zircons with the mid-Neoproterozoic age in the South China Block is the primary indicator that distinguishes the South China Block from the North China Block [66] .…”

Section: Geological Setting and Geochronological Frameworkmentioning

confidence: 97%

Remelting of subducted continental lithosphere: Petrogenesis of Mesozoic magmatic rocks in the Dabie-Sulu orogenic belt

Zhao

Zheng

2009

Sci. China Ser. D-Earth Sci.

206

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The Dabie-Sulu orogenic belt was formed by the Triassic continental collision between the South ChinaBlock and the North China Block. There is a large area of Mesozoic magmatic rocks along this orogenic belt, with emplacement ages mainly at Late Triassic, Late Jurassic and Early Cretaceous. The Late Triassic alkaline rocks and the Late Jurassic granitoids only crop out in the eastern part of the Sulu orogen, whereas the Early Cretaceous magmatic rocks occur as massive granitoids, sporadic intermediate-mafic intrusive and volcanic rocks throughout the Dabie-Sulu orogenic belt. Despite the different ages for their emplacement, the Mesozoic magmatic rocks are all characterized not only by enrichment of LREE and LILE but depletion of HFSE, but also by high initial Sr isotope ratios, low ε Nd (t) values and low radiogeneic Pb isotope compositions. Some zircons from the Jurassic and Cretaceous granitoids contain inherited magmatic cores with Neoprotozoic and Triassic U-Pb ages. Most of the Cretaceous mafic rocks have zircon δ 18 O values and whole-rock δ 13 C values lower than those for the normal mantle.A systematic comparison with adjacent UHP metaigneous rocks shows that the Mesozoic granitoids and mafic rocks have elemental and isotopic features similar to the UHP metagranite and metabasite, respectively. This indicates that these magmatic and metamorphic rocks share the diagnostic features of lithospheric source that has tectonic affinity to the northern edge of the South China Block. Their precursors underwent the UHP metamorphism and the post-collisional anatexis, respectively at different times and depths. Therefore, the Mesozoic magmatic rocks were derived from anatexis of the subducted continental lithosphere itself beneath the collision-thickened orogen; the geodynamic mechanism of the post-collisional magmatisms is tectonic collapse of orogenic roots in response to lithospheric extension.continental subduction, lithosphere anatexis, post-collisional magmatism, Mesozoic tectonics, UHP metamorphic rocks, Dabie-Sulu While oceanic island basalts and andesites are formed during subduction of oceanic crust, the corresponding magmatic rocks are not generated during subduction of continental crust. However, large-scale syn-exhumation and post-collisional magmatic rocks can be formed during exhumation of deeply subducted continental crust and post-collision collapse of collision-thickened orogens [1] . Post-collisional magmatic rocks widely occur in continent collisional orogen [2] . They provide an important approach to study the deep thermal and compositional structure of collisional orogen. In particular, partial melting of deeply subducted continental lithosphere would take place after it has stalled in the uppermost part of the upper mantle for tens of millions years. Therefore, studies concerning the timing, rock type,

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Section: Geological Setting and Geochronological Frameworkmentioning

confidence: 97%

Remelting of subducted continental lithosphere: Petrogenesis of Mesozoic magmatic rocks in the Dabie-Sulu orogenic belt

Zhao

Zheng

2009

Sci. China Ser. D-Earth Sci.

206

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“…As a consequence, the suture in the Sulu orogen is located along the Wulian-Yantai fault [31,80,[92][93][94][95][96] , and the suture in the Dabie orogen is located along the Xiaotian-Mozitan fault [31] . The Jiaobei terrane north of the Wulian-Yantai fault has geotectonic affinity to the North China Block [96,97] , but it behaves like a microcontinent during the Triassic continental collision [96] .…”

Section: Figurementioning

confidence: 99%

“…In the Dabie-Sulu orogenic belt, a possible parameter of distinction is whether protoliths of the target rocks were primarily originated from juvenile mid-Paleoproterozoic lithosphere or not. The North China Block is characterized by arc-continent collision and crustal reworking during the mid-Paleoproterozoic, without growth of contemporaneous juvenile lithosphere (crust plus subcontinental lithospheric mantle) [96,110] . In contrast, there is the growth of juvenile crust and subcontinental lithosphere during mid-Paleoproterozoic in the South China Block [81,82,[111][112][113] .…”

Section: Subduction Erosion and Crustal Detachment During Continentalmentioning

confidence: 99%

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

2008

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“…The Sulu orogenic belt was formed by the Triassic subduction of the Yangtze Block beneath the North China Block, and it contains the largest outcrop of UHP metamorphic rocks on Earth (e.g., Li et al, 1993;Jahn et al, 1996;Zheng et al, 2003). The Precambrian basement in the Jiaobei terrane is mainly composed of the Neoarchaean Jiaodong Group, the Paleoproterozoic Fenzishan and Jingshan groups, and the Neoproterozoic Penglai Group (e.g., Zhang et al, 2003a;Tang et al, 2007;Jahn et al, 2008). The Yanshanian granitoids intruded the Precambrian basement and have been grouped into two main suites: the Linglong granites (~160 Ma) and the Guojialing granodiorites (~130 Ma) (e.g., Wang et al, 1998;Qiu et al, 2002;Zhang et al, 2003aZhang et al, , 2010Ma et al, 2013).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

Rapid lithospheric thinning of the North China Craton: New evidence from cretaceous mafic dikes in the Jiaodong Peninsula

et al. 2016

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The North China Craton is a classic case for the destruction of an ancient craton, in that it records the loss of more than 100 km of ancient refractory lithospheric mantle during the late Mesozoic and early Cenozoic. However, the mechanisms for this lithospheric thinning remain controversial in large part due to the lack of any systematic investigations of the Mesozoic asthenospheric mantle via its derived mafic rocks, which are key to understand the thinning processes. In this paper, we present detailed zircon U-Pb geochronology, elemental geochemistry, and Sr-Nd-Hf isotopic data for lamprophyres and diabase-porphyries of the Jiaodong Peninsula, in the eastern North China Craton in order to place constraints on models for lithospheric thinning. Our results show that the lamprophyres and diabase-porphyries are derived from the convective asthenospheric mantle via different degrees of partial melting, and that this mantle source was previously modified by carbonatitic liquids. Zircon LA-ICP-MS U-Pb dating suggests an emplacement age for these rocks of 123-121 Ma, the earliest evidence for asthenospherically-derived melts in the Jiaodong Peninsula so far. This emplacement age indicates that the thickness of the lithosphere in the Jiaodong Peninsula was relatively thin at that time. Co-occurrence of the asthenospheric and lithospheric mantle-derived mafic rocks as well as high-Mg adakites record a rapid transition from lithospheric to asthenospheric mantle sources, indicating that the lithosphere beneath the Jiaodong Peninsula was rapidly detached just prior to ca. 120 Ma. Lithospheric thinning of the North China Craton may have been initiated from the Jiaodong Peninsula and Bohai Sea and then propagated towards the interior of the craton.

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Geochronology and geochemistry of metamorphic rocks in the Jiaobei terrane: Constraints on its tectonic affinity in the Sulu orogen

Cited by 262 publications

References 123 publications

Remelting of subducted continental lithosphere: Petrogenesis of Mesozoic magmatic rocks in the Dabie-Sulu orogenic belt

Remelting of subducted continental lithosphere: Petrogenesis of Mesozoic magmatic rocks in the Dabie-Sulu orogenic belt

A perspective view on ultrahigh-pressure metamorphism and continental collision in the Dabie-Sulu orogenic belt

Rapid lithospheric thinning of the North China Craton: New evidence from cretaceous mafic dikes in the Jiaodong Peninsula

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