The subduction of the west Pacific plate and the destruction of the North China Craton

2019 ◽  
Vol 62 (9) ◽  
pp. 1340-1350 ◽  
Author(s):  
Rixiang Zhu ◽  
Yigang Xu
Keyword(s):  
North China Craton ◽  
North China ◽  
Pacific Plate ◽  
The West ◽  
West Pacific ◽  
The North

scholarly journals The Metallogenic Setting of the Jiangjiatun Mo Deposit, North China: Constraints from a Combined Zircon U–Pb and Molybdenite Re–Os Isotopic Study

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 723 ◽  
Author(s):  
Ming Li ◽  
Xin Zhang ◽  
Liang Han ◽  
En-Pu Gong ◽  
Guo-Guang Wang
Keyword(s):  
North China Craton ◽  
Late Jurassic ◽  
North China ◽  
Pacific Plate ◽  
Late Triassic ◽  
Isotopic Study ◽  
The North ◽  
Tectonic Transition ◽  
Isotopic System ◽  
Metallogenic Belt

The Jiangjiatun Mo deposit is a recently discovered molybdenum deposit in the easternmost area of the Yan-Liao metallogenic belt, North China Craton. Quartz vein-type Mo mineralization at Jiangjiatun is associated with the granitic porphyry stock. In this study, we performed a combined zircon U–Pb and molybdenite Re-Os dating study on the Jiangjiatun Mo deposit to constrain its mineralization age and metallogenic setting. Laser ablation inductively coupled mass spectrometry (LA-ICP-MS) zircon U–Pb analyses suggest that the granitic porphyry was formed during the Late Jurassic, with a weighted mean 206Pb/238U age of 154 ± 1 Ma (2σ). Seven molybdenite samples from the Jiangjiatun deposit yield a 187Re–187Os isochron age of 157.5 ± 0.5 Ma (2σ). The discrepancy between the U–Pb and Re–Os ages may be explained (1) by the “2 sigma” measurement uncertainty, or (2) by the different closure temperature of the Re–Os isotopic system of molybdenite and the U–Pb isotopic system of zircon. Even though there is a small difference between the zircon U–Pb and molybdenite Re–Os ages, we can clearly identify a Late Jurassic Mo mineralization event at Jiangjiatun in the easternmost area of the Yan-Liao metallogenic belt. The moderate Re concentrations (13 to 73 ppm) in molybdenite from the Jiangjiatun Mo deposit are indicative of the involvement of the mantle materials into the Mo mineralization. The Jiangjiatun Mo deposit is likely the result of the subduction of the paleo-Pacific plate beneath the North China Craton during the Late Jurassic. Combined with the available published regional robust geochronological data, we proposed that the Mo mineralization in the Yan-Liao belt is in good agreement with the tectonic transition from Late Triassic post-collision extensional setting due to the closure of the paleo-Asian ocean to the Yanshanian (J–K1) continental arc setting in response to the subduction of the paleo-Pacific Plate. The study highlights that regional mineralization may provide an excellent constraint on tectonic change.

scholarly journals Long-lived melting of ancient lower crust of the North China Craton in response to paleo-Pacific plate subduction, recorded by adakitic rhyolite

Lithos ◽  
2017 ◽  
Vol 292-293 ◽  
pp. 437-451 ◽  
Author(s):  
Chao Wang ◽  
Shuguang Song ◽  
Yaoling Niu ◽  
Mark B. Allen ◽  
Li Su ◽  
...  
Keyword(s):  
North China Craton ◽  
Lower Crust ◽  
North China ◽  
Pacific Plate ◽  
The North ◽  
Pacific Plate Subduction ◽  
Plate Subduction

XKS splitting-based upper-mantle deformation in the Jiaodong Peninsula records the boundary between the North China Craton and South China Block

2020 ◽  
Vol 222 (2) ◽  
pp. 956-964
Author(s):  
Chenglong Wu ◽  
Tao Xu ◽  
Yinshuang Ai ◽  
Weiyu Dong ◽  
Long Li
Keyword(s):  
South China ◽  
North China Craton ◽  
North China ◽  
Pacific Plate ◽  
Late Triassic ◽  
South China Block ◽  
The North ◽  
Jiaodong Peninsula ◽  
Pacific Plate Subduction ◽  
Plate Subduction

SUMMARY The Jiaodong Peninsula consists of the Jiaobei massif and the Northern Sulu UHP massif. These are separated by the Wulian suture zone (WSZ), a key region for understanding the collision between the North China Craton (NCC) and South China Block (SCB). To interpret this collisional zone, a broad-band seismic profile of 20 stations was installed across the WSZ. Shear wave splitting analysis of teleseismic data revealed a contrast in the splitting patterns beneath different structural zones of the Jiaodong Peninsula. The anisotropic structures of the Jiaobei massif and Northern Sulu UHP massif can be explained by a single anisotropic layer model with WNW-ESE or E-W oriented fast directions. In the WSZ, splitting parameters exhibit pronounced variation in backazimuths indicating a two-layer anisotropy pattern. The lower layer exhibits a WNW-ESE fast direction consistent with that observed in the other two regions. Because the fast direction is generally parallel to the present-day direction of Pacific plate subduction, the anisotropy most likely represents asthenospheric return flow in the big mantle wedge caused by Pacific plate subduction. The upper layer exhibits an NE fast direction, that is, parallel to faulting associated with the WSZ. The lithosphere may preserve fossilized anisotropy induced by the Late Triassic collision of the NCC and SCB even after subsequent destruction and thinning from the Late Mesozoic to Cenozoic. We infer that the WSZ represents a lithospheric-scale structural boundary between the NCC and SCB.

Mesozoic tectonics in the Eastern Block of the North China Craton: implications for subduction of the Pacific plate beneath the Eurasian plate

2007 ◽  
Vol 280 (1) ◽  
pp. 171-188 ◽  
Author(s):  
S. Z. Li ◽  
T. M. Kusky ◽  
G. Zhao ◽  
F. Wu ◽  
J.-Z. Liu ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Pacific Plate ◽  
Eurasian Plate ◽  
The North ◽  
The Pacific

Late Mesozoic intraplate rhyolitic volcanism in the North China Craton: Far-field effect of the westward subduction of the Paleo-Pacific Plate

2019 ◽  
Vol 132 (1-2) ◽  
pp. 291-309 ◽  
Author(s):  
Fan Yang ◽  
M. Santosh ◽  
Sung Won Kim ◽  
Hongying Zhou ◽  
Youn Joong Jeong
Keyword(s):  
North China Craton ◽  
Field Effect ◽  
North China ◽  
Pacific Plate ◽  
Far Field ◽  
Northern Margin ◽  
Late Mesozoic ◽  
The North ◽  
Tectonic Transition ◽  
Lithospheric Extension

Abstract The Late Mesozoic was characterized by extensive volcanism, crustal extension, lithospheric thinning, and craton destruction in the North China Craton (NCC). Here we investigate the petrology, whole-rock geochemistry, zircon U-Pb geochronology, and Lu-Hf isotope of rhyolitic rocks from the Chicheng region of China along the northern margin of the NCC to constrain their petrogenesis, magma evolution, and associated geodynamic processes. The newly obtained zircon U-Pb age data constrain the eruption age of rhyolitic rocks at ca. 144–114 Ma during the Early Cretaceous with multiple magmatic pulses at ca. 141, ca. 137, and ca. 130 Ma as defined by the age peaks. Zircon Hf isotopic data show markedly negative εHf(t) values of –23.0 to –11.8, and corresponding Hf crustal model ages (TDMC) are in the range of ca. 2650 to 1944 Ma, suggesting magma derivation through melting of Paleoproterozoic crustal materials with minor input of reworked Neoarchean components. Geochemically, the rhyolitic rocks correspond to A-type granites, with a mixed arc- and subduction-related signature, although generated in an extensional intraplate setting through partial melting of the mafic lower crust and upper crustal fractional crystallization. We correlate the late Mesozoic intraplate volcanism to the westward subduction of the Paleo-Pacific Plate and its far-field effect. Lithospheric extension and slab rollback of the Paleo-Pacific Plate are considered as the main triggers for the multiple eruptions. The late Mesozoic volcanism in the study area and adjacent regions also broadly coincide with the tectonic transition from the Paleozoic Paleo-Asian to Mesozoic Paleo-Pacific subduction realm with concomitant compressional to extensional tectonic regime.

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