Constraints of Dike Thicknesses on the Metallogenesis and Its Application to the Shihu Gold Deposit
详细信息
- 责任者：Li Dedong (State Key Laboratory of Geological Processes and Mineral Resources ; China University of Geosciences ; Beijing 100083 ; China) ; Luo Zhaohua
- 刊名：Earth Science Frontiers
- 出版年：2011
- 卷期：18(1)
- 关键词：金矿 ; gold ores ; 成矿作用 ; metallogenesis ; 太行山 ; Taihang Mountains
- 页码：p.166-178
- 图表：6 illus., 3 tables, 44 refs.
- 分类号：1001
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
According to the metallogenic theory of the transmagmatic fluids,the magma body is not the source of ore-bearing fluids, but the channel for the fluids. Thus, it will be an effective way to estimate the ore forming potential by calculating the content of fluids injected into the magma body. One-dimensional heat transfer model is used to calculate the cooling time with different thicknesses of three representative types of dikes (granite porphyry, quartz diorite and diabase) in Shihu gold mine.The change rate of magma viscosity during the cooling is also estimated. Simulation results are consistent with the occurrence of ore bodies, suggesting that they are of practical value. According to the length/width ratio of the dike,the minimal critical ore-forming intrusion outcrop area is estimated: 312~1561 m2 for diabase, 0.014~0.068 km2 for quartz diorite and 0.011~0.034 km2 for granite porphyry. This kind of estimation provides a qualitative standard for field geological prospecting, and has certain reference value for rapid exploration.