Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (5): 1430-1439.doi: 10.13278/j.cnki.jjuese.201605113

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Zircon U-Pb Dating of the Quartz Diorite from Delingshan Area of Urad Zhongqi in Inner Monglia and Its Geological Significance

Li Jianbo1, Wang Baohong1, Yang Liang1, Jing Yaozu1, Chen Lizhen2   

  1. 1. Geological and Mineral Survey Institute of Inner Mongolia, Hohhot 010010, China;
    2. Regional Geology and Mineral Resources Survey Institute of Hebei Province, langfang 065000, Hebei, China
  • Received:2016-04-23 Online:2016-09-26 Published:2016-09-26
  • Supported by:

    Supported by Geological Survey Project of China Geological Survey(1212011120707)

Abstract:

The quartz diorite in Delingshan, Urad, Inner Mongolia is tectonically located in the central-northern margin of the North China craton and geochronology and petro-geochemistry of quartz diorite are investigated, and it's forming age and tectonic background are discussed. The age of the quartz diorite dated by LA-MC-ICP-MS U-Pb of zircons is(278.1±1.6)Ma,indicating that it was formed in the Early Permian. Petro-geochemical characteristics show that the quartz diorites are I-type granites, belonging to high-K cale-alkaline series, enriched in large ionic lithophile elements (LIL) of Rb, Sr and K, and depleted in High field strength elements(HFS) of Th,Ta with weakly negative Eu anomalies (δEu=0.61-1.46). This kind of intrusions were formed in an active continental margins, derived from the melt mixing of crust and lithospheric mantle. Combined with geological feature of regional magmatic belt, tectonic settings, forming conditions and emplacement times of the quartz diorite, it is suggested that the quartz diorite of Delingshan intrusion was a result of the subduction of the Paleo-Asian Ocean beneath the northern margin of the North China craton.

Key words: LA-MC-ICP-MS U-Pb zircons age, quartz diorite, geochemistry, Delingshan, Urad Zhongqi in Inner Monglia

CLC Number: 

  • P588.12

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