山东淄博南坡村地区金红石型钛矿矿床地质特征及找矿方向

Geological Characteristics and Prospecting Directions of Ilmenite Type Titanium Deposits in Nanpo Village in Zibo City in Shandong Province

摘要:

山东淄博南坡村地区发现1处大型金红石型钛矿床。矿床赋存于石炭纪本溪组中下部，属古风化壳沉积型矿床。共探明4个矿体，矿体呈层状产出，严格受地层控制。主矿体（Ⅰ号）平均厚度5.87 m，TiO2平均品位1.53%，探获金红石型钛矿物量15.6万t。矿石矿物以金红石为主，并伴生铌钽、锂、镓、钪等多种有益组分。矿床成矿受多重因素控制，本溪组铝质岩系为赋矿基础，奥陶纪末期构造抬升形成的区域性不整合面为控矿关键，晚石炭世温暖潮湿古气候促进母岩风化，台地—潟湖相古地理提供稳定沉积富集环境。本文总结了矿床的地质特征，分析了成矿控制因素，为华北地区同类金红石型钛矿的找矿勘查提供了理论基础。

Abstract:

A large rutile type titanium deposit has been discovered in Nanpo village in Zibo city in Shandong province. The deposit is located in the middle and lower part of Benxi formation of Carboniferous system and belongs to ancient weathering crust sedimentary type deposit. Four ore bodies have been identified, which are layered and strictly controlled by geological strata. The average thickness of main ore body (Ⅰore body) is 5.87 m, the average grade of TiO2 is 1.53%, and 156000 tons of rutile-type titanium minerals have been discovered. The ore minerals are mainly rutile, accompanied by various beneficial components, such as niobium tantalum, lithium, gallium and scandium. The mineralization of mineral deposits is controlled by multiple factors. The aluminum rock series of Benxi formation serves as the ore bearing foundation, and regional unconformity formed by tectonic uplift in late Ordovician period is key controlling factor. The warm and humid paleoclimate of late Carboniferous has promoted the weathering of the parent rock. The platform lagoon facies paleogeography has provided a stable sedimentary enrichment environment. Geological characteristics of the deposit has been summarized, and the controlling factors of mineralization has been analyzed. It will provide a theoretical basis for the exploration and prospecting of similar rutile type titanium deposits in the North China.