鞍山地区地质构造及深部铁矿

Geological Structure and Deep Iron Deposits in the Anshan area

鞍山地区是我国铁矿最集中的地区,已探明铁矿石近100亿t,但对该区地质构造和深部铁矿的认识仍然是不确定的,存在一些争议。不同的意见主要集中在该区是属于向斜构造还是属于背斜构造,这些构造是怎样控制铁矿产出的,深部铁矿远景有多大。针对这些问题,本文在对鞍山地区浅部地质构造及铁矿特征、岩(矿)石物性特点和重磁异常特征等综合研究基础上,采用剖面重磁异常人机交互反演技术对穿越东鞍山和齐大山铁矿区的重磁异常剖面数据进行了反演。结果表明:鞍山地区整体为以铁架山为中心的穹隆构造,而穹隆顶部存在环绕铁架山的向斜构造或"凹陷",该向斜构造控制了鞍山地区铁矿的分布,深部铁矿的规模远大于已探明的地表及浅部铁矿的规模,深部铁矿资源前景巨大。

The Ansban area is an important production area with most abundant iron ore resources in China, which processes approximately 10 billion tons of proven iron ores. However, its geological structure and deep iron deposits are still debated. Divergent opinions are centered on whether the Anshan area is an anticline structure or syncline structure, how iron ore bodies are controlled by geological structures, and what is its deep ore prospecting poten- tial. To address these problems, we used a human-machine interactive inversion technology to process the profiles of gravity and magnetic anomalies. The gravity and magnetic inversion combined with the metallogenic regularity and physical characteristics of rocks and ores is conducted along the Donganshan- Qidashan （A - B） profile. The inversion results indicate that the Anshan area might be considered as a dome structure, where exist several synclines con- trolling iron ore deposits of the Anshan area on the top of the dome around Tiejiashan, and potential huge-sized iron ore deposits at depth which may he much greater than proven deposits on the surface and in the shallow subsurface.