Study On Metallogenic Regularities And Prognosis Of Iron Deposits In Western Shandong Province

The study area (Luxi Uplift: the west Shandong uplift) is located in the eastern edge ofsino-korean paraplatform. Its eastern boundary is the Changyi-Dadian fault which trends toNNE, its west side reaches to NNE Liaocheng-Lankao fault, nearly EW Qihe-Guangrao fault isbounded as the north edge, the south boundary of Shandong is the southern edge of the studyarea. The study area possesses superior iron ore metallogenic geologic conditions, so as to beone of the important ore-concentrating districts in China.Various genetic types of iron ore deposits are widely distributed in Luxi area (westernShandong province). Five types of iron ore are classified, including sedimentary metamorphictype, skarn type, Hydrothermal metasomatic filling and weathering leaching type, magmaticcrystallization differentiation type and sedimentary type. This paper comprehensively collectsgeological and mineral data in Luxi area, systematically summaries iron ore metallogenicgeological conditions and elaborates the corresponding relations between geophysicalcharacteristics and iron deposits in detail. Based on the characteristics of typical iron oredeposits in the study area, such as Hanwang iron deposit, Cangyi iron ore belt, Shanxian irondeposit, Jining iron deposit, Zhangjiawa iron deposit, Jinling iron deposit, Lianziwang irondeposit, Dianzi iron deposit and Xiaojiagou deposit, the paper illustrates the characteristics andmetallogenic regularities of all kinds of iron deposits, and summaries in category themetallogenic models and regional predicting models. By dividing the iron ore metallogenicbelts, metallogenic series, mineralized pedigree, this study delineates the iron ore prospectingtarget areas, and points out the direction of iron ore prospecting in the area.Sedimentary metamorphic type iron deposits generate in the Neo Archean epoch in Luxiarea. This type, distributing in south, southwest and central of Luxi block, is mineralized in theTaishan Group and Jining Group and characterised by banding, stratoid and lensing ore bodiesand obvious strata-bound features. Main metallogenic epoch of skarn type iron deposits focus inlate Yanshan period. This type is subdivided into two styles according to magma intrusions.One is related to intermediate-basic intrusive rocks, lying in Jinan, Laiwu and Zibo area. Theother is relative to intermediate-acid intrusive rocks, distributed in Cangshan and Yinan county.Two types above are mineralized near contact zone of limestone strata and intrusive rocks.Hydrothermal metasomatic filling and weathering leaching type iron deposits are distributedalong the Zihe fault and generate in late Yanshan period. Magmatic crystallization type isdistributed in the Yishu faults zone and it’s nearby, originated in the Palaeoproterozoic epoch.Iron ore rocks contain titanium-magnetite amphibole pyroxene rock. Sedimentary iron ore type is controlled by the weathering surface of intermediate-Ordovician limestone and the bottom ofthe carboniferous. However, because of small scale and low grade, this type turns outinsignificant industrial value and prospecting significance.Based on the analysis of the regional geological and mineral data in Luxi area, andcomparison with metallogenic predicting models, this paper proposes iron ore metallogenicprediction of Luxi area. According to genetic types of iron ore, we confirm24iron oreprospecting target areas for sedimentary metamorphic type, including Hanwang,Cangshan-Zaozhuang, Dongping-Wenshang, Shanxian, Jining iron deposits and other regions.Fourteen iron ore prospecting targets are delineated for skarn type, represented by Laiwu,Jinling, Lianziwang iron deposits. Six iron ore prospecting target areas for Hydrothermalmetasomatic filling and weathering leaching type, distributed nearby Zihe river. Three ilmeniteiron ore prospecting target areas are suggested for magmatic crystallization differentiation type,represented by Tianbao ilmenite deposit in Juxian county. The total47ore prospecting targetsinclude19A-grade targets,15B-grade ones, and13C-grade ones. The study suggests iron oreprospecting targets in Luxi area, providing guidance for iron ore prospecting direction in thefuture. With Association of exploration data, it is proved that the47delineations are reasonableand effective for guiding iron ore survey in Luxi area.