This paper is the result of mineral exploration engineering.
[Objective]The Fengtai ore-concentration area in the Western Qinling is an important part of the Qinling lead-zinc-gold polymetallic metallogenic belt. However, there has been a long running controversial debate about the type and ore-controlling factors of the lead-zinc ore-concentration area. [Methods]Based on the detailed field investigation and data combing of the representative Qiandongshan lead-zinc deposit in the Fengtai ore-concentration Area, the ore-controlling characteristics of the silicon-calcium surface of the deposit are discussed. [Results]It is considered that the bottom plate of the c in the Fengtai Basin is the limestone of the Gudaoling Formation, which is analkaline calcareous rock, and the top plate is the phyllite of the Xinghongpu Formation, which is a siliceous rock. They form a perfect Si/Ca interface. The initially enriched ore-forming materials in the stratumwere enriched again under the action of the Triassic magmatic hydrothermal fluid, andmigrates along a series of NWW-strikefold structures and syngeneic faults in the basin, therefore, they concentrate to form deposits at the Si/Ca interfaceof the turning end of large folds, interlayer slip zone, etc. [Conclusions]Based on this, it is considered that the interlayer slip zone near the turning end of the compound anticline and its wings, the saddle portion of the interticle, and the interlayer slip zone in the area are favorable areas for mineralization.At the same time, the metallogenesis of the Indosinian lead-zinc deposit in the Western Qinling was coupled with large-scale tectonic-magmatic activities in space and time. And the types of lead-zinc deposits in the ore-concentrated area are hydrothermal deposits related to magmatic activities.
Highlights: The ore-controlling characteristics of the Fengtai ore-concentration area is controversial over the years. Taking typical deposits as an example, the ore-controlling characteristics of lead-zinc deposits in the area expound in detail by using the theory of silicon-calcium surface mineralization and taking typical deposits as an example.