Alteration-Mineralization and Element Migration Features of Nihe Iron Deposit in Lujiang,Anhui Province
Jiang Manrong
Zhang Jun
Liu Wenhao
Xiong Suofei
Abstract：The inheritance of elements migration can’t be definitely revealed by traditional methods from Nihe iron ore deposit, which has a multi-stage hydrothermal superimposed alteration process.The quantitative features of the main and trace element migration in the process of hydrothermal alteration is presented in the paper by exploring its prospecting significance by adop-ting the early alteration rock for original rock and then fitting the best concentration equation between slightly late alteration rock with immobile elements by isocon diagram method.It is found that the cations precipitation sequence is roughly from Na to Ca,Mg,Fe,P to Ca,Fe and to Al,Si in Nihe iron deposit.As elements into and out of the system are continuous comple-mentary for both early to late alterations,the alteration and mineralization are considered as a continuous process.The exten-sive albitization is a sign of Na qualitative precipitation,marking the beginning of iron ore mineralization.Anhydrite-diopside mineralization is the result of Ca,Mg and Fe qualitative precipitation which is the ore-closing and ore-hosting alteration.Sec-ondary quartzite and kaolinization is the Al,Si qualitative precipitation migrated from early alteration,which is the long-dis-tance indicative alteration of magnetite.
Keywords：element migrationalteration mineralization zoneiron depositsgeochemistry
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：18( 1034-1051 )