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《Geological Science and Technology Information》 2005-03
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Chronology and Geological Significance of Chelugou Dacite Porphyry in North Qilian Mountains

SONG Zhong-bao,LI Zhi-pei,REN You-xiang,YANG Jian-guo,LI Ya-zhi,XIE Chun-lin(Xi′an Institute of Geology and Mineral Resources, CGS, Xi′an 710054, China)  
Located in the western part of North Qilian Mountains and composed of 12 small intrusions,Chelugou dacite porphyry shows petrochemically to be calialkelinic series. Its diagenetic age is about(427.7±4.5) Ma measured by U-Pb dating method. Most of the granitic intrusions in the western part of Qilian Mountains are closely related to subductive and collisional orogeny, intruded during 440-380 Ma. The occurrence of Chelugou gold, a quartz type deposit, inside tuff near the contact zone suggests that Chelugou dacite porphyry should be the heat source for the early mineralization. Meanwhile, many medium-acid magmatic bodies are developed in the western part of North Qilian Mountains. Therefore, the determination of Chelugou quartz type gold deposit is of theoretical and practical significance for gold exploration in the area.
【Fund】: 原地质矿产部“九五”科技攻关项目“北祁连山西段黄铁矿型铜多金属矿床与构造蚀变岩型金矿床成矿模式及找矿预测研究”(95-02-004-03)
【CateGory Index】: P588.142
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