陕西凤太矿铅锌矿集区矿床成因及找矿方向探讨-UMPersonalWorld.PDF

陕西凤太矿铅锌矿集区矿床成因及找矿方向探讨 陈明寿刁卫红王建涛 《甘肃冶金》2017 年第1 期72-77,共6 页 Abstract 大多数学者认为凤太矿集区铅锌矿属热水喷流沉积（SEDEX ）–改造（再造）型,矿体产出受地层、构造及岩相三位 一体控制;最近几年受造山型成矿理论影响,部分学者认为凤太矿集区铅锌矿属后生热液矿床。成矿理论的深入研究 对该区的找矿具重要的指导意义,笔者认为凤太矿集区铅锌矿床为后生热液成矿,矿体受不同岩性界面控制,并不局限 于泥盆系,从而拓展了找矿视野。 1. Introduction Tonalite-trondhjemite-granodiorite (TTG) gneisses, taking up to ~80% of the preserved Archean continental crust, are the dominant intrusive rocks in Archean terranes (Martin et al., 2005; Smithies et al., 2009; Moyen and Martin, 2012), and they are the most important geological signatures of formation and evolution of the early continental crust. Over the past few decades, detailed geological, geochemical and geochronological investigations, as well as high temperature-high pressure experiments, have been conducted on deeply understanding on the petrogenesis of Archean TTG gneisses and their tectonic implications (Rapp and Watson, 1995; Rapp et al., 1999; Smithies, 2000; Condie, 2005; Martin et al., 2005; Zeh et al., 2010; Moyen and Martin, 2012; Qian and Hermann, 2013; Laurent et al., 2014; Martin et al., 2014). It has been widely accepted that the magmatic precursors of TTG gneisses are derived from partial melting of hydrous basaltic rocks at pressures higher than 10 Kbar (Smithies, 2000; Martin et al., 2005; Moyen and Martin, 2012; Laurent et al., 2014). However, the geodynamic settings that TTG magmas were generated remains hot debates (Drummond and Defant, 1990; Rapp and Watson, 1995; Martin, 1999; Smithies, 2000; Smithies and Champion, 2000; Foley et al., 2002; Martin et al., 2005; Condie, 2005; Moyen and Martin, 2012; Laurent et al., 2014; Martin et al., 2014). Based on their geochemical similarities to modern adakites, some researchers suggested that the Archean TTG gneisses may be derived from partial melting of either subducted slabs or oceanic plateaus in island arc environments (Defant and Drummond, 1990; Martin, 1999; Martin et al., 2005; Xiong et al., 2009; Laur