The Role of Earth's Deep Volatile Cycling in the Generation of Intracontinental High‐Mg Andesites: Implication for Lithospheric Thinning Beneath the North China Craton

2019 ◽  
Vol 124 (2) ◽  
pp. 1305-1323 ◽  
Author(s):  
Xianlei Geng ◽  
Yongsheng Liu ◽  
Xuan‐Ce Wang ◽  
Zhaochu Hu ◽  
Lian Zhou ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Lithospheric Thinning ◽  
The North ◽  
Volatile Cycling

The role of lithospheric heterogeneities in continental rifting: Implications for rift diversity in the North China Craton

2020 ◽  
Vol 139 ◽  
pp. 101765
Author(s):  
Kai Wang ◽  
Lin Chen ◽  
Xiong Xiong ◽  
Zhiyong Yan ◽  
Renxian Xie
Keyword(s):  
North China Craton ◽  
North China ◽  
Continental Rifting ◽  
The North

Early Cretaceous Xiuyan adakitic granitoids in the Liaodong Peninsula, eastern China: petrogenesis and implications for lithospheric thinning of the North China Craton

2021 ◽  
Vol 58 (1) ◽  
pp. 50-66
Author(s):  
Yang Dong ◽  
Jingdang Liu ◽  
Yanfei Zhang ◽  
Shiyong Dou ◽  
Yanbin Li ◽  
...  
Keyword(s):  
Early Cretaceous ◽  
North China Craton ◽  
Lower Crust ◽  
North China ◽  
Eastern China ◽  
Lithospheric Thinning ◽  
The North ◽  
Magma Sources ◽  
Liaodong Peninsula ◽  
T Values

Mesozoic magmatic rocks are widely distributed in the North China Craton (NCC) and are crucial to understanding the timing, location, and geodynamic mechanisms of lithospheric thinning of the NCC. In this study, we report geochronological, petrogeochemical, and Lu–Hf isotopic data for adakitic granitoids from different parts of Xiuyan pluton in the Liaodong Peninsula, aiming to constrain their magma sources, petrogenesis, and tectonic implications. The adakites are metaluminous to weakly peraluminous and are classified as high-K calc-alkaline I-type granite with Early Cretaceous zircon U–Pb ages of 129–126 Ma. They exhibit adakite-like geochemical characteristics, such as high Sr content and low Yb and Y contents, coupled with high Sr/Y and no pronounced Eu anomalies. They are enriched in Rb, U, and light rare-earth elements and are depleted in Ta, Nb, P, and Ti. The adakites from the eastern part of the pluton have low εHf(t) values (–8.5 to –4.0) with old TDM2 ages (1.57–1.31 Ga), indicating they were derived from the lower crust containing juvenile mantle-derived materials. In contrast, adakites from the northern part of the pluton have lower εHf(t) values (–19.7 to –16.6) with older TDM2 ages (2.21–2.03 Ga), indicating that they were derived mainly from an ancient crust. Our results show that both adakitic magmas were derived from partial melting of delaminated lower crust. Their relatively high MgO and Ni contents and Mg# values indicate that the melts interacted with mantle peridotites. The lower crust delamination beneath the Liaodong Peninsula resulted from paleo-Pacific plate subduction during the Early Cretaceous, which resulted in thinning of Mesozoic crust in the Xiuyan area.

Newly identified Jurassic–Cretaceous migmatites in the Liaodong Peninsula: unravelling a Mesozoic anatectic event related to the lithospheric thinning of the North China Craton

2020 ◽  
pp. 1-17
Author(s):  
Jin Liu ◽  
Jian Zhang ◽  
Chang-Qing Yin ◽  
Chang-Quan Cheng ◽  
Jia-Hui Qian ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Thermal Anomaly ◽  
Thin Layers ◽  
Crustal Thickening ◽  
Late Triassic ◽  
Metasedimentary Rocks ◽  
Lithospheric Thinning ◽  
The North ◽  
Liaodong Peninsula

Abstract A suite of Jurassic–Cretaceous migmatites was newly identified in the Liaodong Peninsula of the eastern North China Craton (NCC). Anatexis is commonly associated with crustal thickening. However, the newly identified migmatites were formed during strong lithospheric thinning accompanied by voluminous magmatism and intense deformation. Field investigations show that the migmatites are spatially associated with low-angle detachment faults. Numerous leucosomes occur either as isolated lenses or thin layers (dykes), parallel to or cross-cutting the foliation. Peritectic minerals such as titanite and sillimanite are distributed mainly along the boundaries of reactant minerals or are accumulated along the foliation. Most zircons show distinct core–rim structures, and the rims have low Th/U ratios (0.01–0.24). Zircon U–Pb dating results indicate that the protoliths of the migmatites were either the Late Triassic (224–221 Ma) diorites or metasedimentary rocks deposited sometime after c. 1857 Ma. The zircon overgrowth rims record crystallization ages of 173–161 Ma and 125 Ma, which represent the formation time of leucosomes. These ages are consistent with those reported magmatic events in the Liaodong Peninsula and surrounding areas. The leucosomes indicate a strong anatectic event during the Jurassic–Cretaceous period. Partial melting occurred through the breakdown of muscovite and biotite with the presence of water-rich fluid under a thermal anomaly regime. The possible mechanism that caused the 173–161 Ma and 125 Ma anatectic events was intimately related to the regional crustal extension during the lithospheric thinning of the NCC. Meanwhile, the newly generated melts further weakened the rigidity of the crust and enhanced the extension.

Late Mesozoic magmatism and sedimentation in the Jiaodong Peninsula: New constraints on lithospheric thinning of the North China Craton

Lithos ◽  
2018 ◽  
Vol 322 ◽  
pp. 312-324 ◽  
Author(s):  
Rui Zhao ◽  
Qingfei Wang ◽  
Jun Deng ◽  
M. Santosh ◽  
Xuefei Liu ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Late Mesozoic ◽  
Lithospheric Thinning ◽  
The North ◽  
Jiaodong Peninsula ◽  
Mesozoic Magmatism
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