Deep Structural Framework and Genetic Analysis of Gold Concentration Areas in the Northwestern Jiaodong Peninsula, China: A New Understanding based on High‐Resolution Reflective Seismic Survey

Abstract

AbstractThe gold concentration areas in the northwestern Jiaodong Peninsula constituted an important gold metallogenetic region in Eastern China during the Mesozoic. The deep geological bodies' texture characteristic is important for exploring the resources thoroughly and understanding the metallogenic process. The detailed textures were revealed using high‐resolution seismic profiles through the three major ore‐controlling structures‐Sanshandao fault zone, Jiaojia fault zone and Zhaoping fault zone. This study aims to establish a deep structural framework of this area. Based on their formation mechanism, the fault structures developed in the area can be divided into regional and local fault structures. The structural styles are characterised by superimposing their compressional, strike‐slip and extensional multi‐stage activities. The crust is cut by vertical structures corresponding to a left‐lateral strike‐slip fault system on the surface. Nearby these structures are the arc‐shape structures formed by multi‐stage magma intrusions into the upper crust. Bounded by the Tancheng–Lujiang and Muping–Jimo fault zones, the current Jiaodong block, developed a series of NE‐trending strike‐slip fault systems, was probably formed by the assemblage of several obliquely aligned blocks. The intensive magmatism and hydrothermal activity between the blocks induced large‐scale mineralisation. It provides a new angle of view for understanding the cratonic destruction and large ore‐concentration formed during the Mesozoic.