试论柴达木盆地基底中央断裂带

重力、航磁、地震、遥感、地表地质等资料的研究结果表明,柴达木盆地基底存在着中央断裂带。中央断裂带将柴达木盆地基底分为南北性质截然不同的两部分,说明柴达木盆地存在吕梁期以前的古陆核。结合中酸性岩浆岩氧化物成分构造环境判别结果,进一步可以推断古阿尔金洋的存在,使古秦祁昆洋的范围扩大。阿尔金运动使阿尔金洋封闭,岛弧成陆,形成前寒武纪的褶皱镶嵌边。      

四川盆地前寒武系重磁电物性特征与建模

四川盆地安岳特大型气田的发现,证明了中国前寒武系油气前景广阔,四川盆地元古界也因此成为超深层油气勘探的重点领域。非地震勘探是超深层油气勘探中深部结构研究的重要手段。然而,四川盆地前寒武系重磁电物性资料不足,制约了物性建模,严重影响了重磁电勘探技术在该盆地的有效应用。为此,以四川盆地周缘前寒武系露头标本为基础,通过对沉积岩、变质岩及火成岩标本的密度、磁化率和复电阻率进行分析并研究不同地层、不同岩性标本的重磁电物性特征,建立了四川盆地前寒武系古老地层的重磁电物性模型,为该盆地前寒武系非地震油气勘探提供了物性资料基础。     

Metallogenic characteristics and ore-prospecting future of pre-cambrian gold deposits in Mufu-Jiuling district

Mufu-Jiuling district is an important placer gold producing land since the ancient time. In recent years, some primary gold deposits and mineralizations, e. g., Huangjindong and Tulongshan gold deposits, have been found. But the metallogenic conditions and regularities as well as the ore-prospecting future remain to be recognized. Through the study on the metallogenic background and condition, the auriferous source bed and the mineralizing characteristics, three types of primary gold deposits are confirmed to be prospective in this district and some key problems about their prospecting and evaluating are put forward. Synopsis of the author Wu Yanzhi, professor, born in 1931. Research fields include: prospecting and metallogeny of ore deposits.