1.23 Ga mafic dykes in the North China Craton and their implications for the reconstruction of the Columbia supercontinent

The Proterozoic world was shaped by the Paleo-Mesoproterozoic Columbia and Neoproterozoic Rodinia supercontinents. The North China Craton (NCC) is an integral component of Columbia supercontinent assembly, but the lack of rock records in the transitional period between Columbia and Rodinia in the la...

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Bibliographic Details
Published in:Gondwana Research
Main Authors: Wang, Wei, Liu, Shuwen, Santosh, M., Zhang, Lifei, Bai, Xiang, Zhao, Yue, Zhang, Shuanhong, Guo, Rongrong
Other Authors: Liu, SW (reprint author), Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China., Peking Univ, Sch Earth & Space Sci, Key Lab Orogen Belts & Crustal Evolut, Minist Educ, Beijing 100871, Peoples R China., China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China., Kochi Univ, Fac Sci, Kochi 7808520, Japan., Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China., Peking Univ, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
Format: Journal/Newspaper
Language:English
Published: GONDWANA RESEARCH 2015
Subjects:
Mafic dykes
Geochronology
Mantle plume
Columbia-Rodinia transition
North China Craton
LARGE IGNEOUS PROVINCES
CONTINENTAL BREAK-UP
PB BADDELEYITE AGES
MESOPROTEROZOIC SUPERCONTINENT
HF ISOTOPES
LU-HF
GEOCHEMICAL CONSTRAINTS
GRANITOID GNEISSES
TECTONIC EVOLUTION
Ocean Island
Siberia
Online Access:https://hdl.handle.net/20.500.11897/419758
https://doi.org/10.1016/j.gr.2014.02.002
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Summary:The Proterozoic world was shaped by the Paleo-Mesoproterozoic Columbia and Neoproterozoic Rodinia supercontinents. The North China Craton (NCC) is an integral component of Columbia supercontinent assembly, but the lack of rock records in the transitional period between Columbia and Rodinia in the late Mesoproterozoic (1.3-1.2 Ga) has resulted in its exclusion from models that trace the Columbia-Rodinia transition. The paleogeographic position of the NCC is also elusive, with India, Baltica, and Siberia as potential neighbors during the early evolution of Columbia. Here we report the discovery of a suite of similar to 1.23 Ga mafic dykes covering an area of similar to 0.6 x 10(6) km(2) of the NCC. These mafic rocks can be classified into both alkaline and subalkaline groups. The former group may have been derived from lower degrees of partial melting of a depleted asthenospheric mantle with limited involvement of a lithospheric mantle component, whereas the latter group can be modeled by higher degrees of partial melting of a subduction-modified enriched lithospheric mantle. Considering the large areal extent of the 123 Ga mafic dykes, and their dominantly OIB (Ocean Island Basalt)-like geochemical features, a Mesoproterozoic mantle plume regime is invoked for the NCC. Compiling information on global similar to 1.27-121 Ga mafic dykes, flood basalts and layered intrusions, we establish a Mesoproterozoic hotspot track, and consider the NCC to have been located between Laurentia and Baltica. Combined with recent paleomagnetic and geological data, we infer that the Laurentia-NCC-Baltica connection may have existed since the late Paleoproterozoic. We further propose that both plate tectonic (introversion or extroversion) and mantle plume regimes played vital roles during the supercontinent transition. (C) 2014 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. National Natural Science Foundation of China [41121062, 41272209, 41072143, 40872120]; China Geological Survey [1212011121070] SCI(E) ARTICLE swliu@pku.edu.cn 4 1407-1418 27

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