Phase Equilibria Modeling and P-T Evolution of the Mafic Lower-Crustal Xenoliths from the Southeastern Margin of the North China Craton

2018 ◽  
Vol 29 (5) ◽  
pp. 1236-1253 ◽  
Author(s):  
Jiazhen Nie ◽  
Yican Liu ◽  
Yang Yang
Keyword(s):  
Phase Equilibria ◽  
North China Craton ◽  
North China ◽  
The North ◽  
Southeastern Margin ◽  
Crustal Xenoliths ◽  
Lower Crustal

Eoarchean to Paleoproterozoic crustal evolution in the North China Craton

2020 ◽  
Author(s):  
Qiang Ma ◽  
Yi-Gang Xu ◽  
Xiao-Long Huang ◽  
Jian-Ping Zheng
Keyword(s):  
North China Craton ◽  
North China ◽  
Lower Layer ◽  
Secular Change ◽  
Recycling Rate ◽  
Crustal Rocks ◽  
The North ◽  
O Isotopes ◽  
Crustal Xenoliths ◽  
Lower Crustal

<p>The early evolution of continental crust, particularly its lower layer, during the first 2.0 billion years of Earth history remains enigmatic. Here, we present the first coupled in-situ U-Pb, Lu-Hf and O isotope data for the Precambrian zircons from fourteen deep-crustal xenoliths from five localities in the North China craton. The results show that: (1) the oldest (3.82−3.55 Ga) known lower crustal rocks were survived in the southern part of this craton; (2) the Eo-Paleoarchean zircons have predominant sub-chondritic Hf isotope compositions and elevated δ<sup>18</sup>O values, suggesting Lu-Hf fractionation and crust-hydrosphere interactions on the Earth can be traced back to Eoarchean or even earlier; (3) a secular change in zircon O isotopes documents an increase in recycling rate of surface-derived materials into magmas at the end of Archean, which, in turn, is possibly linked to modern style subduction processes and maturation of the crust at that time.</p>

Geochronology, geochemistry and petrogenesis of the Laozhaishan dolerite sills in the southeastern margin of the North China Craton and their geological implication

2019 ◽  
Vol 67 ◽  
pp. 131-146 ◽  
Author(s):  
Ren-Zhi Zhu ◽  
Pei Ni ◽  
Guo-Guang Wang ◽  
Jun-Ying Ding ◽  
Ming-Sen Fan ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
The North ◽  
Southeastern Margin ◽  
Geological Implication

scholarly journals Repositioning the Great Unconformity at the southeastern margin of the North China Craton

2019 ◽  
Vol 324 ◽  
pp. 1-17 ◽  
Author(s):  
Bin Wan ◽  
Qing Tang ◽  
Ke Pang ◽  
Xiaopeng Wang ◽  
Zhian Bao ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
The North ◽  
Southeastern Margin

Late Jurassic, high Ba–Sr Linglong granites in the Jiaodong Peninsula, East China: lower crustal melting products in the eastern North China Craton

2017 ◽  
Vol 155 (5) ◽  
pp. 1040-1062 ◽  
Author(s):  
LI-QIANG YANG ◽  
YILDIRIM DILEK ◽  
ZHONG-LIANG WANG ◽  
ROBERTO F. WEINBERG ◽  
YUE LIU
Keyword(s):  
North China Craton ◽  
Late Jurassic ◽  
North China ◽  
Eastern China ◽  
Ultrahigh Pressure ◽  
Granitic Rocks ◽  
Crustal Melting ◽  
Heavy Rare Earth Element ◽  
The North ◽  
Lower Crustal

AbstractThe Jurassic Linglong granites, intrusive into the North China Craton (NCC) in eastern China, provide a critical record of the first major episode of lithospheric-scale extension and magmatism in NE China during Mesozoic time. Our U–Pb zircon dating reveals that the Linglong granites were emplaced during 161–158 Ma, shortly after the inception of a shallow subduction of the Palaeo-Pacific plate beneath East Asia during Middle Jurassic time. These granites have high alkali contents (K2O + Na2O = 8–9 wt%), low MgO and Mg no. values and variable Cr–Ni abundances. Their relatively high Ba and Sr concentrations, relatively low heavy rare Earth element (HREE) and strongly fractionated REE patterns characterize them as high Ba–Sr granites. The negative whole-rock εNd(t) values ranging from −22.4 to −10.9 and wide-ranging zircon εHf(t) values of −39.1 to −1.5 suggest that magmas of the Linglong granites were produced by partial melting of a garnet-amphibolite-bearing lower crust of the Jiaobei Terrane and by re-melting of the Triassic ultrahigh-pressure (UHP) metamorphic rocks and alkaline suites of the Sulu Terrane. The occurrence in the granitic rocks of inherited zircons of the Neoarchaean, Palaeoproterozoic, Neoproterozoic, Palaeozoic and Triassic ages suggests that magmas of the Linglong granites interacted with the ancient crust in these terranes during their ascent. Asthenospheric upwelling, induced by the steepening and rapid rollback of the Palaeo-Pacific slab during Late Jurassic time, provided the heat source for the inferred lower crustal melting. Trench migration and thermal weakening of the crust caused extensional deformation and thinning in the eastern part of the NCC.

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