Petrological and geochronological evidence for Paleoproterozoic granulite-facies metamorphism of the South Liaohe Group in the Jiao-Liao-Ji Belt, North China Craton

2019 ◽  
Vol 327 ◽  
pp. 121-143 ◽  
Author(s):  
Ping-Hua Liu ◽  
Fu-Lai Liu ◽  
Zhong-Hua Tian ◽  
Jia Cai ◽  
Lei Ji ◽  
...  
Keyword(s):  
North China Craton ◽  
North China ◽  
Granulite Facies ◽  
The South ◽  
Granulite Facies Metamorphism ◽  
Facies Metamorphism ◽  
Geochronological Evidence

Arc-related peridotite blocks exhumed to the Eastern Block of the North China Craton prior to 2.47 Ga

2021 ◽  
pp. 1-24
Author(s):  
Mingyue Gong ◽  
Wei Tian ◽  
Zhuang Li ◽  
Bin Fu ◽  
Chunjing Wei
Keyword(s):  
North China Craton ◽  
North China ◽  
Mantle Wedge ◽  
Granulite Facies ◽  
Granulite Facies Metamorphism ◽  
Melt Extraction ◽  
The North ◽  
Mantle Peridotites ◽  
Facies Metamorphism ◽  
Light Rare Earth Elements

Abstract The Songling and Majiayu peridotite blocks occur in the Eastern Block, North China Craton (NCC). Geothermobarometry data show that the Songling peridotites began exhumation from a depth of c. 70 km (c. 23 kbar). During exhumation, the Songling peridotites were intruded by an upper-crust-derived, high-δ18O (up to +7.28‰ in zircon) trondhjemitic dyke at 2.47 Ga and experienced granulite-facies metamorphism. The Songling peridotites have hybrid mantle wedge (HMW) -like high SiO2 (> 45 wt%), high FeOt (c. 10 wt%) content, high modal orthopyroxene abundance (> 35%) and high ϵNd(t) (+18.4 to +21.4), which were generated by the reaction between peridotite and eclogite-derived melts. The clinopyroxenes from the Songling peridotites were in equilibrium with a Nb-, Zr- and Ti-depleted arc-like magma. The Majiayu peridotites are characterized by depletion of Nb, Zr and Hf and are highly enriched in FeOt, Th and light rare earth elements (LREEs), which can be interpreted as an open system reaction between hydrous melts and fore-arc mantle peridotites. These two peridotite blocks are considered to be arc-related mantle peridotites that experienced melt extraction and metasomatism in different styles. They were exhumed to the north margin of the North China Craton during the c. 2.47 Ga arc–continent collision along the Zunhua structural belt.

Zircon U–Pb geochronology of the Zanhuang metamorphic complex: reappraisal of the Palaeoproterozoic amalgamation of the Trans-North China Orogen

2013 ◽  
Vol 150 (4) ◽  
pp. 756-764 ◽  
Author(s):  
LING-LING XIAO ◽  
GUO-DONG WANG ◽  
HAO WANG ◽  
ZONG-SHENG JIANG ◽  
CHUN-RONG DIWU ◽  
...  
Keyword(s):  
High Resolution ◽  
North China Craton ◽  
North China ◽  
Metamorphic Complex ◽  
Middle Section ◽  
The South ◽  
The North ◽  
Facies Metamorphism ◽  
Isothermal Decompression ◽  
Metamorphic Terranes

AbstractAmphibolites and metapelites exposed in the Zanhuang metamorphic complex situated in the south-middle section of the Trans-North China Orogen (TNCO) underwent upper-amphibolite-facies metamorphism and record clockwise P–T paths including retrograde isothermal decompression. High-resolution zircon U–Pb geochronological analyses indicate that the metamorphic peak occurred during ~ 1840–1860 Ma, which is in accordance with the ubiquitous metamorphic ages of ~ 1850 Ma retrieved by miscellaneous geochronologic methods throughout the metamorphic terranes of the northern TNCO, confirming that the south-middle section of the TNCO was involved in the amalgamation of the Eastern and Western Blocks of the North China Craton during the Palaeoproterozoic.

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