Study on geological characteristics and genesis of Lugu type iron ore deposit in Xikang Yunnan axis
The article briefly describes the geological characteristics of the Lugu type iron deposit,including the Dadingshan and Tiekuangshan iron deposits in Xikang Yunnan Axis,analyzes the spatial and temporal relation-ships between the iron deposits and the strata,igneous rocks and structures,and discusses the mineralization background,mineralization process,and mineralization mechanism. It analyzes the source of the ore-forming mate-rial in the Lugu type iron deposit and the conclusion is that the iron originates from the Dengxiangying Formation epi-metamorphic (volcanic-sedimentary) iron-bearing formation,while the silicon comes from both the Dengxiangy-ing Formation epi-metamorphic (volcanic-sedimentary) iron-bearing formation and the Lugu granite of the Jinning Period. The zircon U-Pb dating method was used to determine the age of the Lugu granite body,which is (822.4±5.4)Ma,indicating that the iron-rich pulp formed by the remelting is the result of the melting of the granite magma. The age of the biotite determined by the K-Ar dating method for the late stage of the hydrothermal altera-tion of the Lugu granite is (725.5±3.7)Ma. Combining the spatial relationship between the strata and the ore bod-ies,it is concluded that the Dengxiangying Formation epi-metamorphic (volcanic-sedimentary) iron-bearing forma-tion and the Lugu granite body are both the mineralizing geological bodies for the Lugu rich iron deposit. The former provides the mineralizing source,while the latter,together with the rich iron deposit,is a product of deep (re)melting and formed by the same process. The iron-rich pulp migrated through normal faults and eventually precipitated into the ore deposit at this location.
Lugu type iron depositDengxiangying GroupLugu granitemineral sourcemineralization
万方数据
维普
