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《Geology and Mineral Resources of South China》 2004-04
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Zircon U-Pb age of the quartz diorite in North Daqing mountains, central Inner Mongolia

ZHANG Yu-qing, LIU Jun-jie (Inner Mongolia Institute of Geological Survey, Hohhot 010020, China)  
The Qianhao quartz diorites emplaced in Late Archean Se'ertengshan Group composes a part of the Late Archean granite-greenstone belt with plagiogranites. Petrochemical and geochemical research of quartz diorites shows the features I-type granites and accord with Archean high-aluminum TTG granites. They might be resulted through partial melting of different source rocks with participation of mantle magma. Five zircons selected from quartz diorites were crystallized from magma and constitute a U-Pb upper intersection age of (2535±16) Ma,which represents the crystalline age of the intrusion and providing new evidence for crustal evolution of North China Craton.
【Fund】: 中国地质调查局1∶5万区域地质调查项目(20001300008031).
【CateGory Index】: P597.3
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