地质学报（英文版）2004，Vol.78Issue(2)：463-470,8.
Re-Os Dating of Molybdenite from the Nannihu Mo (-W) Orefield in the East Qinling and Its Geodynamic Significance
Re-Os Dating of Molybdenite from the Nannihu Mo (-W) Orefield in the East Qinling and Its Geodynamic Significance
摘要
Abstract
Located in the East Qinling molybdenum metallogenic belt on the southern margin of the North China craton, the Nannihu Mo (-W) orefield comprising Nannihu, Sandaozhuang, and Shangfanggou deposits is a superlarge skam-porphyry Mo (-W) orefield in the world. Re-Os dating was performed of six molybdenite samples from the Mo deposits in the Nannihu Mo orefield with inductively coupled plasma mass spectrometry (ICP-MS). The results show that the Re-Os model ages are 145.8±2.1-141.8±2.1 Ma for the Nannihu deposit, 145.4±2.0-144.5±2.2 Ma (averaging 145.0±2.2 Ma) for the Sandaozhuang deposit and 145.8±2.1-143.8±2.1 Ma (averaging 144.8±2.1 Ma) for the Shangfanggou deposit; dating of the six samples yields an isochron age of 141.5±7.8 Ma (2σ), which accurately determines the timing of mineralization. The results also suggest that the ore-forming materials were mainly derived from the lower crust, mixed with minor mantle components. These Mo deposits were formed during the transition of the Mesozoic tectonic regime in eastern China, and its mineralization was a part of the Late Mesozoic large-scale mineralization in that region.关键词
Mo deposit/Re-Os dating/East Qinling/Nannihu/ChinaKey words
Mo deposit/Re-Os dating/East Qinling/Nannihu/China分类
天文与地球科学引用本文复制引用
LI Yongfeng,MAO Jingwen,GUO Baojian,SHAO Yongjun,FEI Hongcai,HU Huabin..Re-Os Dating of Molybdenite from the Nannihu Mo (-W) Orefield in the East Qinling and Its Geodynamic Significance[J].地质学报（英文版）,2004,78(2):463-470,8.基金项目
This study was granted by the State Development and Planning Programs for Basic Researches in Key Areas of China (grant G1999043211). （grant G1999043211）
