Geochronology and Geochemistry of Mesoproterozoic Mafic Rocks in the Kontum Complex and Its Implication for the Columbia Reconstruction

被引:4
|
作者
Xu, Chang [1 ]
Gan, Chengshi [1 ,2 ]
Hieu, Pham T. [3 ]
Qian, Xin [1 ,2 ]
Minh, Pham [3 ]
Zhang, Feifei [4 ]
Wang, Yuejun [1 ,2 ]
机构
[1] Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Zhuhai 519082, Peoples R China
[2] Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China
[3] VNU HCM Univ Sci, Fac Geol, Ho Chi Minh 70000, Vietnam
[4] Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
基金
中国国家自然科学基金;
关键词
GRANULITE-FACIES METAMORPHISM; U-PB AGE; SOUTH CHINA; EAST ANTARCTICA; SUPERCONTINENT CYCLES; INDOSINIAN OROGENY; CENTRAL VIETNAM; HAINAN ISLAND; NORTH CHINA; PROTEROZOIC TECTONICS;
D O I
10.2113/2022/4967935
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The assembly-breakup of the Columbia/Nuna supercontinent is one of the most important issues in the Precambrian geology. The reconstruction of the Indochina Block in the Columbia supercontinent is poorly constrained by far, due to the deficiency of available geochronological and geochemical data for the exposed Precambrian rocks. The Mesoproterozoic plagioclase amphibolites in the Kontum Complex have significant implication for the reconstruction of the Indochina Block within the Columbia supercontinent. This study presents detailed petrological, zircon U-Pb geochronological and Lu-Hf isotopic, and whole -rock geochemical analyses for the plagioclase amphibolites. The plagioclase amphibolite protoliths were formed at -1432-1403 Ma and experienced metamorphism at 486-457 Ma, suggesting the preservation of a Mesoproterozoic basement in the Kontum Complex. The samples are strongly enriched in LREEs and LILEs but depleted in Nb, Ta, and Ti. They have relatively low (87Sr/86Sr)i ratios (from 0.705055 to 0.708728), positive & epsilon;Nd (t) values (from +2.6 to +2.8), and positive zircon & epsilon;Hf (t) values (from +9.9 to +17.1). Such signatures suggest that they were derived from a mantle wedge that has been metasomatized by sediment -derived melts in an arc setting and caused the breakup of the Columbia supercontinent. The Kontum Complex from the Indochina Block, along with Laurentia and East Antarctica, was distributed at the Columbian periphery.
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页数:27
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