摘要
福建地处西太平洋火山带的外带,浙闽粤火山活动带中段。中生代火山—侵入岩广布东南沿海,成矿地质条件好,(带内新的矿产地陆续发现),尤其是贵金属矿产更为突出。大的成矿带都与相应的地质构造背景有着密切的关系,利用地球物理资料分析深部地质构造。进行成矿预测已是区域性成矿预测不可缺少的手段。本区除系统地进行了1/50万区域重力调查,1/5万航空磁测,1/20万区域化探扫面外,还进行了爆破地震测深、大地电磁测深、地温场测量等深部地球物理探测,取得了丰富的地球物理、地球化学的信息。通过对区域地球物理资料电算处理,并进行定性和定量解释,推断了控制中生代火山活动机制的深部构造特征,较好的确定了中性及酸性侵入岩体的分布范围,判断其所处的构造部位和形态,进而建立火山岩基底构造格局,火山—侵入岩带分布。结合地球化学成果,从深部地质、地球物理特征阐述了成矿的构造条件,并进行了成矿的预测。
Fujian province is located in the outer zone of western pacific volcanic belt, the central sector of Zhejiang-Fujian-Guangdong volcanic active belt. Mesozoic volcanic-intrusive rocks distributed widely along the coast of Southeast China, where is favorable to metallization, especially for noble metal deposits. All the known economic significant metallogenetie belt are mainly related to the geological-teetonic enviroment. It is very important to use geophysical data to analysis deep geological structures for performing regional metallogenetic prognosis.
In this area, besides regional gravity prospecting on the scale of 1:500000, aeromagnetic survey on the scale of 1:50000 and regional geochemical prospecting on the scale of 1:200000, we also have carried out some deep geophysical prospecting, for example, explosion earthquake depth-sounding, telluric electromagnetic sounding, earth-temperature field measurement, and gained a great deal of geophysical and geochemical information. By computer-processing of regional geophysical data, and making qualitative and quantitative interpretation, we have derived deep tectonic features which controlled the mechanism of Mesozoic volcanic atctivities, definited the shape and distribution of intermediateacidic intrusive rocks, and established the tectonic style of volcanic rock basement and the distribution of volcanic-intrusive rock zone. Combined with geochemical results, tectonic condisions for metallization were outlined from deep geological and geophysical characteristics. Also, we have performed metal- logenetic prognosis for some prospective area.
出处
《福建地质》
1990年第3期236-243,共8页
Geology of Fujian
