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FURTHER DISCUSSION ON THE PROBLEMS OF MINEROGENETIC SERIES OF MINERAL DEPOSITS

ChengYuqi;Chen Yuchuan;Zhao Yiming;Song Tianrui Chinese Academy of Geological Sciences Institute of Mineral Deposits,Chinese Academy of Geological Sciences Institute of Geology,Chinese Academy of Geological Sciences  
The classification of minerogenetic series is based on synthetic studiesof the geological conditions under which various types or type-groups of mi- neral deposits are formed. Above all, such series may be divided into threemajor groups as according to the geological setting of mineralization concernedcomparable to that of the formation of three major rock types. The main factors to be considered in the dividing of the first majorgroup, i. e., the magmato-minerogenetic series association of the magmato-genic mineral deposits, into fifteen series (Table 1, English abstract;Table 3,Chinese text) are the acidity (basicity) and/or alkalinity and mode of occu-rrence of the magmatic rocks concerned, including whether the volcanic seriesare marine or/and continental, and also their geotectonic setting and othergeological conditions. The chief basis, on which the second, the sedimento-mi-nerogenetic series association,or the minerogenetic series association geneticallyrelated to the process of sedimentation and also of diagenesis, is further cl-assified into seven series (Table 2, English abstract; Table 4, Chinese text),is the litho-palaeogeographic features of the sedimentational epoch concerned,with due consideration also given to other factors such as geotectonic, clim-atic, geochemical, hydrodynamic, etc. for the subdividing of certain series anddiscussing some related geological problems. As for the third group, i. e.,mineral deposits of metamorphic terrains, its subdivision into five metamor-pho-minerogenetic series (Table 3, English abstract; Table 5, Chinese text)is based upon the characters of relevant pre-metamorphic formations as wellas nature and degree of metamorphism. But transitional series between thesethree minerogenetic series associations have also been found. Certain minerogenetic series were formed only at certain geological peri-ods and thus reflect in a way some characteristics of such evolutional epochsof the earth, such as the predominance of banded iron ore sub-series (sub-series "a" of the ME-1 minerogenetic series of Table 3 of this abstract) inArchean and early Proterozoic times, the frequent occurrence of the "poly-matal" marine black shale, "coal-stone" (and siliceous rocks) association mi-nerogenetic series of early Cambrian in certain regions of the world(S-7 M.S.,Table 2 of this abstract), etc. Minerogenetic series remoulded intensively by geological processes suchas metamorphism, magmatism and exogenesis with accompanying mineralizationof later minerogenotic epochs are often found in nature. But they should beclassified and named as according to the mineralization and minerogeneticepoch which have played the leading role in their coming into being. Having investigated the metallogeny of the rare earth-rare metal "colo-ured-metal"-minerogenetic series (Ma-1, Table 1 in this abstract or Table3 in the Chinese text) that related to the Yanshanian granites of medium-to shallow-depth emplacement of the Nanling region of South China throughan integrating analysis of the governing factors such as regional geology, geo-tectonics, magmatism, mineralization etc., four mineralization stages of theYanshanian metallogenetic epoch of the region in question have been reco-gnized (Fig. 4, Chinese text) and hence four sub-minerogenotic series havebeen subdivided, viz., W-TR-Nb-Ta sub-series W-Sn-Pb-Zn-Nb-Ta-Be sub-se-ries, Sn-Pb-Zn-Cu-Sb-As-Hg sub-series and U series. This may serve as anexample to elucidate the leading factors to be considered for the furtherclassification of certain minerogenetic series. E=epitherma1;f=filling;H=hypothermal;Hp=hydatopneumatogenic;Lm=late magmatic;LmA=late magmatic autometasomatic;M=mesothermal;Ma-dif=(late)magmatic differentiation;Ma-inj.=(late)magmatic injection;m=metasomatic; O-M=ore magma;p=pneumatolitic;Pm=pyrometasomatic; V=volcano; V-S=volcano-sedinemtary;Examples: H-M=hypothermal to mesothermal;Mf=mesothermal filling;Hm(f)=hypothermalmetasomatic (fillfng);V-Hp=volcano-hydatopneumatogenic. ①Being mobile region in the Pre-Middle Proterozoic times.②The prefix "metamorph
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