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Li J.,Geological and Mineral Survey Institute of Inner Mongolia | Wang B.,Geological and Mineral Survey Institute of Inner Mongolia | Yang L.,Geological and Mineral Survey Institute of Inner Mongolia | Jing Y.,Geological and Mineral Survey Institute of Inner Mongolia | Chen L.,Regional Geology and Mineral Resources Survey Institute of Hebei Province
Jilin Daxue Xuebao (Diqiu Kexue Ban)/Journal of Jilin University (Earth Science Edition) | Year: 2016

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. © 2016, Science Press. All right reserved.


Zhang L.,Regional Geology and Mineral Resources Survey Institute of Hebei Province | Zhang D.-K.,Regional Geology and Mineral Resources Survey Institute of Hebei Province | Zhang S.-R.,Tianjin Institute of Geology and Mineral Resources | Tian F.-Y.,Regional Geology and Mineral Resources Survey Institute of Hebei Province | And 3 more authors.
Geological Bulletin of China | Year: 2014

As shown by previous researches, the denudation-accumulation balance mechanism is an essential rule of the transforming and accumulating behavior of natural heavy minerals at the surface. Based on some application examples and the rule of transforming and accumulating behavior of heavy minerals, this paper tries to sum up the method for sorting out heavy mineral data and re-delineation of heavy mineral anomalies by way of dynamic and reverse ideas. The authors aim to put forward a better prospecting method which brings placer prospecting into full play. ©, 2014, China Geological Survey. All right reserved.

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