A Preliminary Study of the Characteristics of Surface Texture on Quartz Grains in Mekeng Iron Deposits of Southwestern Fujian
Liping Zhu · Huadong Shifan Daxue xuebao. Ziran kexue ban · 1982
The history of using SEM to study surface texture of minerals is rather short,especially scarce cases are the observation of quartz in rocks of comparatively older geological ages.Therefore, surface texture of quartz grains were studied under SEM in this paper.Samples were collected from quartz-magnetite ores of the main ore-body in Mekeng Iron Deposits, Clear traces, caused by subaqueous mechanical collision, were found to be retained on these quartz grains, even though they had passed through diagenesis and alteration of later periods.Thus, It is clear that these quartz came mainly from terrigeneous fragments, and formed after passing through aubaqueous transportation and sedimentation in epeiric environments.Accordingly, it may be deduced that the primitive iron elements of these iron ores which paragenesis with quartz were produced from terrestrial source. The genesis of Mekeing Iron Deposits have two main different points.l)The contact replacement deposits; 2) The sedimentation-later hydrothermal superimposed alteration deposits. It is supposed that this paper may be used as an evidence to prove the sedimentary genesis of this Deposits.