• 责任者：Song Yang (Key Laboratory of Metallogeny and Mineral Assessment ; MLR ; Institute of Mineral Resources ; CAGS ; Beijing 100037 ; China) ; Wang Shuzhi
• 刊名：Geotectonica et Metallogenia
• 出版年：2013
• 卷期：37(3)
• 关键词：金矿 ; gold ores ; 河北 ; Hebei Province
• 页码：p.410-421
• 图表：7 illus., 1 table, 51 refs.
• 分类号：1001
• issnNo：ISSN1001-1552
• isbnNo：CN44-1595/P

     Being rich in gold deposits, the Jidong area is considered one of the most representative gold metallogenic belts in the North China Craton. Most ore bodies are hosted in the Precambrian basement rock series. The morphology of ore bodies and related rock mass emplacement are restricted by the basement structure. On the basis of previous studies, we divided the Jidong Archaean basement into the Jinchangyu-Zhunhua-Malanyu compact greenstone belt and the Dushan-Taipingzai-Qianan gneiss quaquaversal upheaval area. The purpose of such separation was to study the large-and medium-scale constructive background of typical gold deposits in Jinchangyu, Huajian, and Yuerya, among others. The study was also intended to summarize the tectonic characteristics of the ore field. We obtained LA-ICP-MS zircon U-Pb dates for mixed granites surrounding the gneiss upheaval area. The results reveal that the occurrence of atectonic magma event was related to cratonization in 2514.7±8.7 Ma, which caused preliminary gathering of gold. The model ages of two Re-Os molybdenites from gold ores in the Yuerya are 168.4±2.7 and 167.2±2.4 Ma, respectively. The ages indicate that mineralization occurred in the Yanshanian. Combined with the chronological data obtained in previous studies, our findings suggest that the gold ores in Jidong were formed in the middle of Indochina- Yanshanian. A period of intense magmatic activities took place roughly every 20 Ma, and the mineralization exhibited stage characteristics. We established a gold metallogenic evolution model based on tectonic characteristics： during the period of micro-continental collision and Amalgamation （4500 Ma to 1850 Ma）, metallogenic materials were preliminarily enriched; during the Yan-Liao chasmic period in the Mesoproterozoic-Neoproterozoic era （1850 Ma to 600 Ma）, the NE-trending ore-controlling structural framework was established; during the intraplate orogenic metallogenic period （242 Ma to 165 Ma）, the most advantageous metallogenic location was formed by tectonic activation and fracture in the zone of extrusion schistosity. Gold deposits were formed through magmatic activities in various stages.