Abstract
The Neoarchean Western Liaoning basement terranes in the northern part of North China Craton chiefly consist of tholeiitic basalts in the north, TTG gneisses and metavolcanic rocks in the northwest, and K-rich granitoids in the southeast. In the southeastern zone, porphyritic monzodioritic-quartz monzodioritic-granodioritic-monzogranitic (MQGM) gneisses are the major lithological assemblage, and locally contain minor xenoliths of TTG gneisses. Based on the major mafic mineral phases, the porphyritic MQGM gneisses can be divided into amphibole-dominated and biotite-dominated groups. Zircon U–Pb isotopic dating indicates that the amphibole-dominated MQGM gneisses, biotite-dominated MQGM gneisses, and tonalitic gneiss xenolith were emplaced during 2546–2529 Ma, 2546–2531 Ma, and at 2563 Ma, respectively. The 2563 Ma tonalitic gneiss xenolith displays geochemical affinities to high-SiO2 adakites, and may be formed by the partial melting of descending oceanic slabs, with the melt contaminated by mantle peridotite. The amphibole-dominated MQGM gneisses are geochemically analogous to sanukitoids, and their magmatic precursors were formed by partial melting of lithospheric mantle, which was metasomatized by dehydration fluids and melts derived from subducted oceanic sediments and slabs. The magmatic precursors of the biotite-dominated MQGM gneisses were generated by the partial melting of medium-K to high-K mafic rocks at medium pressures. Integrated with previous studies on supracrustal sequences and granitoids in Western Liaoning Province, the Neoarchean lithological assemblages in the southeastern zone were most likely formed in an active continental margin setting.
| Original language | English |
|---|---|
| Pages (from-to) | 296-311 |
| Number of pages | 16 |
| Journal | Lithos |
| Volume | 322 |
| DOIs | |
| Publication status | Published - 1 Dec 2018 |
Keywords
- Neoarchean active continental margin
- Northern North China Craton
- Petrogenesis
- Sanukitoids and potassic granites
- Western Liaoning Province
Cite this
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Neoarchean magmatic arc in the Western Liaoning Province, northern North China Craton : Geochemical and isotopic constraints from sanukitoids and associated granitoids. / Fu, Jinghao; Liu, Shuwen; Cawood, Peter A.; Wang, Maojiang; Hu, Fangyang; Sun, Guozheng; Gao, Lei; Hu, Yalu.
In: Lithos, Vol. 322, 01.12.2018, p. 296-311.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - Neoarchean magmatic arc in the Western Liaoning Province, northern North China Craton
T2 - Geochemical and isotopic constraints from sanukitoids and associated granitoids
AU - Fu, Jinghao
AU - Liu, Shuwen
AU - Cawood, Peter A.
AU - Wang, Maojiang
AU - Hu, Fangyang
AU - Sun, Guozheng
AU - Gao, Lei
AU - Hu, Yalu
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The Neoarchean Western Liaoning basement terranes in the northern part of North China Craton chiefly consist of tholeiitic basalts in the north, TTG gneisses and metavolcanic rocks in the northwest, and K-rich granitoids in the southeast. In the southeastern zone, porphyritic monzodioritic-quartz monzodioritic-granodioritic-monzogranitic (MQGM) gneisses are the major lithological assemblage, and locally contain minor xenoliths of TTG gneisses. Based on the major mafic mineral phases, the porphyritic MQGM gneisses can be divided into amphibole-dominated and biotite-dominated groups. Zircon U–Pb isotopic dating indicates that the amphibole-dominated MQGM gneisses, biotite-dominated MQGM gneisses, and tonalitic gneiss xenolith were emplaced during 2546–2529 Ma, 2546–2531 Ma, and at 2563 Ma, respectively. The 2563 Ma tonalitic gneiss xenolith displays geochemical affinities to high-SiO2 adakites, and may be formed by the partial melting of descending oceanic slabs, with the melt contaminated by mantle peridotite. The amphibole-dominated MQGM gneisses are geochemically analogous to sanukitoids, and their magmatic precursors were formed by partial melting of lithospheric mantle, which was metasomatized by dehydration fluids and melts derived from subducted oceanic sediments and slabs. The magmatic precursors of the biotite-dominated MQGM gneisses were generated by the partial melting of medium-K to high-K mafic rocks at medium pressures. Integrated with previous studies on supracrustal sequences and granitoids in Western Liaoning Province, the Neoarchean lithological assemblages in the southeastern zone were most likely formed in an active continental margin setting.
AB - The Neoarchean Western Liaoning basement terranes in the northern part of North China Craton chiefly consist of tholeiitic basalts in the north, TTG gneisses and metavolcanic rocks in the northwest, and K-rich granitoids in the southeast. In the southeastern zone, porphyritic monzodioritic-quartz monzodioritic-granodioritic-monzogranitic (MQGM) gneisses are the major lithological assemblage, and locally contain minor xenoliths of TTG gneisses. Based on the major mafic mineral phases, the porphyritic MQGM gneisses can be divided into amphibole-dominated and biotite-dominated groups. Zircon U–Pb isotopic dating indicates that the amphibole-dominated MQGM gneisses, biotite-dominated MQGM gneisses, and tonalitic gneiss xenolith were emplaced during 2546–2529 Ma, 2546–2531 Ma, and at 2563 Ma, respectively. The 2563 Ma tonalitic gneiss xenolith displays geochemical affinities to high-SiO2 adakites, and may be formed by the partial melting of descending oceanic slabs, with the melt contaminated by mantle peridotite. The amphibole-dominated MQGM gneisses are geochemically analogous to sanukitoids, and their magmatic precursors were formed by partial melting of lithospheric mantle, which was metasomatized by dehydration fluids and melts derived from subducted oceanic sediments and slabs. The magmatic precursors of the biotite-dominated MQGM gneisses were generated by the partial melting of medium-K to high-K mafic rocks at medium pressures. Integrated with previous studies on supracrustal sequences and granitoids in Western Liaoning Province, the Neoarchean lithological assemblages in the southeastern zone were most likely formed in an active continental margin setting.
KW - Neoarchean active continental margin
KW - Northern North China Craton
KW - Petrogenesis
KW - Sanukitoids and potassic granites
KW - Western Liaoning Province
UR - http://www.scopus.com/inward/record.url?scp=85055752143&partnerID=8YFLogxK
U2 - 10.1016/j.lithos.2018.10.024
DO - 10.1016/j.lithos.2018.10.024
M3 - Article
VL - 322
SP - 296
EP - 311
JO - Lithos
JF - Lithos
SN - 0024-4937
ER -