摘要
胶东土堆—沙旺密集产出多种脉岩,是富集地幔部分熔融的产物。相近的Zr/H f和U/Th比值指示它们具有一致的岩浆源区。区内脉岩与金矿在时空上密切伴生,Pb同位素组成接近,应属于同一构造同源岩浆活动的产物。结合前人C-H-O-流体包裹体研究成果,表明胶东金矿化中有幔源流体参与的成分。这最有可能与郯庐断裂在早白垩纪的左行走滑及脉岩岩浆活动有关。
The wide spread dike outcrops in the Tudui-Shawang gold deposit are products of partial melting of an ancient enriched lithospheric mantle. Similar Zr/Hf and U/Th ratios indicate they share the same magma origin. These dikes are temporally and spatially associated with the gold deposit, and they have the same Pb isotopic compositions ,which suggest the comagmatic activities in the same tectonic background. Combined with the published C-H-O-fluid inclusions data, the authors consider that the mantle fluids had participated in the metallogeny. The most possibility is ascribed to the sinistral strike-slip movement of the Tanlu fault zone during the early Cretaceous and the related dike magma event .
出处
《资源环境与工程》
2006年第6期751-754,共4页
Resources Environment & Engineering
关键词
脉岩
微量元素
PB同位素
胶东
dikes
trace elements
lead （Pb） isotope
Jiaodong
