中文摘要：

在江苏省的 Ningzhen 区域在中间降低的长江带代表最东部的 magmatic 区域。polymetallic 存款的形成与早白垩纪中间酸的侵入有近基因的关系。在这研究，二中生代中间酸的恼人的岩石的 LA-ICP-MS 锆石地球年代学(包括 Shima 斑状的 granodiorite 和 Gaozi 石英闪长岩斑岩) 在 Ningzhen，区域系统地被调查。这些新 geochronological 数据证明在 Ningzhen 区域的中间酸的 magmatism 标明日期到近似在 109 和 101 妈之间。我们为 Cishantou skarn 的现在的新 40Ar-39Ar 金云母年龄熨抑制在 Ningzhen 区域预定 mineralisation 的存款。在 Cishantou skarn 存款的金云母产出 104 的 40Ar-39Ar 高原年龄

英文摘要：

The Ningzhen region in Jiangsu Province represents the easternmost magmatic region in the middle-lower Yangtze River belt. The formation of the polymetallic deposits has close genetic relationships with Early Cretaceous intermediate-acid intrusions. In this study, LA-ICP-MS zircon geochronology of two Mesozoic intermediate-acid intrusive rocks （including the Shima porphyritic granodiorite and Gaozi quartz diorite porphyry） in the Ningzhen region were systematically investigated. These new geochrono- logical data demonstrate that the intermediate-acid magmatism in the Ningzhen region dates to approximately between 109 and 101 Ma. We present new 4~Ar-39Ar phlogopite ages for the Cishantou skarn iron deposits that constrain the timing of the mineral isation in the Ningzhen region. The phlogopite in the Cishantou skarn deposits yielded a 4Ar-39Ar plateau age of 104±1 Ma. This result coincides with the ages of the Anjishan and Tongshan Cu （Mo） deposits in the Ningzhen region. Our high-precision geo chronological data together with recent high-precision geochronological studies （such as zircon LA-ICP-MS U-Pb, zircon SHRIMP U-Pb, molybdenite Re-Os and single-mineral 4Ar-39Ar dates） reveal that there were four periods （152-- 135 Ma, 135-- 127 Ma, 127--121 Ma, 109--101 Ma） of magmatism and ore formation in the middle-lower Yangtze River metallogenic belt. The Mesozoic intermediate-acid magmatism and mineralisation in the Ningzhen region belong to the latest episode in the mid dle-lower Yangtze River metallogenic belt.