·Generally the study area is characterized by hydrothermal alterations with many vertical and lateral variations At the deposit scale the alterations display a clear zonation of mineral assemblages and were broadly synchronous with the mineralization These alteration facies are arranged around the ore body mainly in footwall rocks
·Primary mineralogy gangue minerals and ore assemblages are all affected Iron oxides oxyhydroxides and sulphates derive from decomposition of Fe bearing sulphides Alteration zonation model of a gold rich porphyry copper system with maximal development of a biotite magnetite assemblage in the potassic zone There is no vertical
Research on wall rock alteration is of great importance to the understanding and exploration of ore deposits The microscopic changes of the same mineral in different alteration zones can provide information about the migration and enrichment of ore forming elements In this paper a typical profile of a high grade iron ore body in Gongchangling iron deposit was investigated and
·In this paper a typical profile of a high grade iron ore body in Gongchangling iron deposit was investigated and sampled The samples were checked by polarized microscopy and alterations zonation were delineated according to the h EN
·Sketch geological map showing the distribution of alteration minerals and zonation for the typical skarn porphyry ore deposits in southeastern Hubei Province Figure 5 Sketch geological map showing the representative SWIR spectrum parameter in 2D and 3D from the Tonglvshan Cu Fe Au deposit
Ma for the hydrothermal alteration Billay et al 1997 40Ar/39Ar dating of biotite and muscovite from ore zone gave an alteration age of about 515 Ma Mechessa 1996 Fluid inclusion studies on various quartz vein generations Billay et al 1997; Mechessa 1996 indicate that the fluids are aqueous carbonic fluids low to moderate in
·The zonation in Au Cu chalcocite bornite chalcopyrite pyrite is the result of a low T very acidic SO4 bearing ore fluid Our alteration models involving Fe Na K Cl rich and CO2 H2S bearing
The Galinge skarn iron polymetallic ore deposit of western Qinghai Province lies in central Qimantag metallogenic bodies are located in the contact zone between granodiorites adamellite and dolomitic marble and in the marble and altered andesites which are distributed along the NWW striking rupture structural fracture zone in the exocontact
·The ore body presents in vein like structures with mineralization associated with alunite dickite alteration in the upper part and with dickite sericite alteration in the lower part Ore minerals consist of covellite digenite pyrite chalcopyrite tenantite and bornite Zhang et al 1996 Previous studies have noted the development of
·It has been recognized for the past century that copper deposits in common with those of many other metals are heterogeneously concentrated in Earth s upper crust resulting in areally restricted copper provinces that were generated during several discrete metallogenic epochs over time intervals of up to several hundred million years
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