Constraints of Tectonic Stress Regime on Mineralization System Related to the Hypabyssal Intrusion: Implication from the Computational Modeling Experiments on the Geodynamics during Cooling Process of the Yueshan Intrusion in
详细信息
- 责任者：Liu Liangming (Computational Geosciences Research Centre ; Central South University ; Changsha 410083 ; China) ; Zhou Ruichao
- 刊名：Acta Petrologica Sinica
- 出版年：2010
- 卷期：26(9)
- 关键词：构造应力场 ; tectonic stress field ; 成矿系统 ; metallogenic system ; 安徽 ; Anhui Province
- 页码：p.2869-2878
- 图表：6 illus., 1 table, 35 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
///In this paper,the Yueshan intrusion and its related Anqing copper deposit are studied by computational modeling experiments on geodynamics of intrusion’s cooling process in different tectonic stress regimes,based on the common geological studies.The results show some important implications for the metallogenic genesis.When models subjected to non tectonic deformation,no dilation zones occur along the intrusion contact.When the models subjected to stretching deformation or shorting deformation,the dilation zones occur but in different patterns and only the dilation zone pattern produced in the models subjected to stretching deformation can explain the distribution of the existing ore bodies.It is demonstrated that the local flow-focus dilation zones along the intrusion contact are critically controlled by the tectonic stress regime,and the tensional stress regime might have played an important role in the mineralization system related to the Yueshan intrusion.When modeling in the regime of non tectonic stress or tensional stress,the fluid pressure in the contact zone must trend to decrease during the processes,but when the modeling is in the compressive stress regime,the fluid in the contact zone may become overpressure,that is favorable for porphyry mineralization,suggesting that the compressive stress regime is favorable for porphyry mineralization.The main reason for the lack of porphyry copper deposits related to the hypabyssal intrusions in the Tongling-Anqing district is that the crust in the district was under stretching setting when the hypabyssal intrusion-related mineralization took place.
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