对分布于华北板块东缘的辽宁铁岭、瓦房店及山东蒙阴等3个金伯利岩区的地质构造特征进行了研究，利用地层时代、构造行迹、古地磁以及同位素资料，对该区域金伯利岩的侵位时间进行了综合约束，认为该区域金伯利岩的侵位时间应该在250-30...对分布于华北板块东缘的辽宁铁岭、瓦房店及山东蒙阴等3个金伯利岩区的地质构造特征进行了研究，利用地层时代、构造行迹、古地磁以及同位素资料，对该区域金伯利岩的侵位时间进行了综合约束，认为该区域金伯利岩的侵位时间应该在250-300 Ma 之间。在此基础上，结合华北板块与扬子板块在古生代时的相互运移特征，对华北板块东缘金刚石的成矿区域地质背景进行了分析，并结合构造形迹的研究，对该区域金刚石原生矿进行了成矿预测。展开更多
Both low procedural blank and high-precision measurements of isotopic ratios are crucial for the analysis of micro samples. This study reports a chemical procedure of ultra-low blank for the high precision measurement...Both low procedural blank and high-precision measurements of isotopic ratios are crucial for the analysis of micro samples. This study reports a chemical procedure of ultra-low blank for the high precision measurement of Sr isotopic ratios on micro samples (<1 ng level) using a new-type thermal ionization mass spectrometer IsoProbe-T, with a case study of single-grain Rb-Sr isochron dating on phlogopite from the Fuxian kimberlite in Liaoning Province. This method can be employed in studies of high resolution Rb-Sr geochronology and Sr isotopic geochemistry and thus will broaden application of the Rb-Sr isotopic system to earth sciences.展开更多
文摘对分布于华北板块东缘的辽宁铁岭、瓦房店及山东蒙阴等3个金伯利岩区的地质构造特征进行了研究，利用地层时代、构造行迹、古地磁以及同位素资料，对该区域金伯利岩的侵位时间进行了综合约束，认为该区域金伯利岩的侵位时间应该在250-300 Ma 之间。在此基础上，结合华北板块与扬子板块在古生代时的相互运移特征，对华北板块东缘金刚石的成矿区域地质背景进行了分析，并结合构造形迹的研究，对该区域金刚石原生矿进行了成矿预测。
基金supported by the National N atural Science Foundation of China(Grant Nos.40403008 and 40372106)the China Postdoctoral Science Foundation.
文摘Both low procedural blank and high-precision measurements of isotopic ratios are crucial for the analysis of micro samples. This study reports a chemical procedure of ultra-low blank for the high precision measurement of Sr isotopic ratios on micro samples (<1 ng level) using a new-type thermal ionization mass spectrometer IsoProbe-T, with a case study of single-grain Rb-Sr isochron dating on phlogopite from the Fuxian kimberlite in Liaoning Province. This method can be employed in studies of high resolution Rb-Sr geochronology and Sr isotopic geochemistry and thus will broaden application of the Rb-Sr isotopic system to earth sciences.
