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The Study On Deposit Characteri Stics And Metallogenic Regularity Of Shilu Iron Deposit In Hainan Province

Posted on:2015-02-08Degree:MasterType:Thesis
Country:ChinaCandidate:X G YangFull Text:PDF
GTID:2180330503453531Subject:Mineral prospecting and exploration
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Shilu iron deposit, in Hainan Province, is famous for Fe-Co-Cu polymetallic deposit, used to be called “Asia’s largest iron-rich deposit”. However, after nearly the sixty-year mining, high quality resources are mined out and iron ore resources face the threat of resource exhaustion. Although predecessors had carried out a large number of geological survey and scientific research on Shilu iron deposit, the prospecting is still unable to get breakthough in the deep, edge, near and far peripheral area.Based on the comprehensive collecting, sorting and analyzing previous studies, the main orebodies were selected for field geological survey, measuring geological sections and geological mapping. Combined with the trenching and drilling being implemented, specimens were collected systematically. The detailed petrography, main and trace element analysis, EPMA and other research methods were used to analyse and contraste the geological characteristics, petrogeochemical characteristics of every orebody. The deposit genesis and metallogenic model were explored and metallogenic regulation were summarized, in order to provide the certain reference and useful information for the next phase in the deep, edge, near and far peripheral area.Based on the above research, the following three aspects of understanding are made:(1) Shilu iron deposit is obviously affected and controledby layers, structure and metamorphism.Shilu iron deposit occurs in the sixth sequence of Shilu Group, Qingbaikou System, with the main host rocks as the banded diopside-tremolite rocks, diopside-tremolite dolostones, showing the obvious characteristics of layer-control and rock-control.Shilu iron deposit is controlled by the synclinorium, and the position which superimposed by the late secondary folds has large and thick orebodies. The fault structure usually cuts and reforms rich iron orebodies.The deposit experienced various types of metamorphism including regional metamorphism, dynamic metamorphism, contact metamorphism and hydrothermal alteration.(2)Shilu high-grade iron ores have the following characteristics:The high-grade iron ores are mainly composed by hematite and quartz, with a small quantity of magnetite and less other minerals. Hematite associates with quartz with irregular surfaces, or fills in the cracks of quartz, showing they have syngenesis relationship. The poorly rounded quartz presents its original sedimentary characteristics.The geochemistry characteristics are similar between Beiyi orebody and Nanliu orebody, having some differences with Zhengmei orebody’s, which probably was affected by hydrotherm of late Yanshanian period. Rich hematite and rich magnetite show the different Eu-anomaly characteristics, but the two types of ores have the similar REE and trace element distribution patterns, showing they had same genesis and were affected by late hydrotherm.(3)Some understanding of the genesis of Shilu iron deposit.The diopside-tremolite rocks have extremely similar geochemical characteristics, which reflects they have same material source. The original rock composition of diopside-tremolite rocks is very complex, and it could be dolomitic marl, dolomite or other carbonate rocks experienced metamorphism into the diopside-tremolite rocks with banded structure.It’s inferred roughly that Shilu iron deposit is the deposit of the volcano sedimentary metamorphic type superimposed by late structure and hydrotherm.
Keywords/Search Tags:Deposit genesis, Metallogenic regulation, Volcano sedimentary metamorphic type, Geochemical characteristic, Shilu iron deposit
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