DOI:10.19762/j.cnki.dizhixuebao.2021130.
 
Discovery of early Eoarchean Hadean zircons in eastern Hebei, North China Craton
Author NameAffiliationE-mail
WAN Yusheng 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037 wanyusheng@bjshrimp.cn 
XIE Hangqiang 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
WANG Huichu 2) Tianjin Center of Geological Survey, China Geological Survey, Tianjin, 300170  
LIU Shoujie 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
CHU Hang 2) Tianjin Center of Geological Survey, China Geological Survey, Tianjin, 300170  
XIAO Zhibin 2) Tianjin Center of Geological Survey, China Geological Survey, Tianjin, 300170  
LI Yuan 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
HAO Guangming 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
LI Pengchuan 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
DONG Chunyan 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
LIU Dunyi 1) Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037  
Abstract:The formation, composition and evolution of the oldest continental crust is the logical starting point for discussing the differentiation and development of the crust mantle system of the Earth. However, the rarity of preserved ancient continental crust due to its long term reworking make this research extremely challenging. Fuchsite quartzite with abundant 3. 4~3. 8 Ga detrital zircons have been discovered in early study in the Labashan area, Lulong, which is very similar in rock feature and detrital zircon age distribution to that in the Huangbaiyu area, Qian’an. This study carried out SHRIMP U- Pb dating on zircons from meta sedimentary rocks associated with fuchsite quartzite in the Labashan area. Ninety four analyses on zircons from biotite plagioclase gneiss (J2006) reveal that detrital zircons commonly show strong lead loss with data being mainly distributed along two discordant lines with upper intercept ages of 3. 8 Ga and 3. 45 Ga. An age of 3. 08 Ga was obtained for metamorphic zircons. In feldspar quartzite (J2009) for which 68 analyses have been finished, six detrital zircons of 3. 92~4. 0 Ga have been identified together with abundant 3. 4~3. 8 Ga detrital zircons. The discovery of early Eoarchean to Hadean detrital zircons assuredly indicates that the North China Craton has a long term history of formation and evolution up to 4. 0 Ga. The 3. 1~3. 4 Ga Caozhuang Labashan rock series defined in this study is mainly composed of meta sedimentary rocks and meta mafic to ultramafic rocks, suggesting an environment of plume continental crust interaction. In terms of the shape features of detrital zircons and the different age distribution of abundant ancient detrital zircons from different samples, it is speculated that the source region from which the detrital materials were derived is at short range and in a large scale, and contains multiple granitic magmatism at the periods of 3. 92~4. 0 Ga, 3. 8 Ga, 3. 6~3. 7 Ga and 3. 4~3. 45 Ga, respectively.
keywords:early Eoarchean Hadean  detrital zircon  eastern Hebei  North China Craton  SHRIMP U- Pb zircon dating
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