华南花岗岩两个成岩成矿系列的演化  

ON THE EVOLUTION OF TWO PETROGENETIC AND MINERALIZED SERIES OF GRANITES IN SOUTH CHINA

作　　者：王联魁 朱为方 张绍立 

出　　处：《地球化学》1982年第4期329-339,共11页Geochimica

摘　　要：Series Ⅰ(the Nanling Series)has a sequence of petrogenesis and mineralization:monzonitic granite or granodiorite→biotite granite→leucocratic granite→granoporphyry or quartz porphyry→intermediate-basic dikes;ree→Nb,Ta(Li,Rb,Cs),Be,Sn,W,Mo,Bi,As→Cu,Zn,Pb→Sb,Hg,U.Series Ⅱ(the Yangtze Series):pyroxene diorite(or gabbro)→diorite or quartz diorite→granodicrite (quartz monzonite)or monzonitic granite→granite→K-feldspar granite→granoporphyry or quartz porphyry(syenitic porphyry or quartz syenitic porphyry)→intermediate-bastic dikes;Fe→Cu(Au)→Mα(W)→Zn,Pb→Pb(Ag).There exists an evolutionary trend for each series.Obvious differences have been recognized between Series Ⅰand Ⅱ.As for Series Ⅱ，the bulk composition is close to that of andesite.Relatively high temperature of formation(980°-1,140℃）,petrochemieal enrichment in Mg and Ca,the composition of biotite characterized by the high content of magnesium,assemblages of accessory minerals(magnetite-sphene-apatite or magnetite-ilmenite-REE-rich zircon), of biotite characterized by the high content of magnesium,assemblages of accessory minerals(magnetite-sphene-apatite or magnetite-ilmenite-REE-rich zircon),trace elements predominated by Cl and Sr with ∑ Ce>∑Y in the rocks and accessory minerals,relatively high δEn(0.74-0.99)without depleticn,δ^18O<10%,δ^34S elose to that of meteorite sulfur,relatively high content of platium-group elements(>10 times)characteristic of mantle derivation,very low ^37Sr/^86Sr(0.7036-0.7085)and the occurrence of intermediate-basic dikes(similar to basalts in composition)in the final evolutionary stage are sufficiently enough to show that Series Ⅱ has a.material souree in the lower crust or in the upper mantle.The fact that ^37Sr/^86Sr>0.7037 in most eases implies a partial coantamination by crystal materials.As for Series I,the bulk formation(600°-680℃）,chemical composition noted for high SiO2,and K2O,complicated accessory mineralogy and assemblages(magnetite-ilmenite-zircon,or monaziSeries I (the Nanling Series) has a sequence of petrogenesis and mineralization: monzonitic granite or granodiorite → biotite granite → leucocratic granite → grano-porphyry or quartz porphyry → intermediate-basic dikes; REE → Nb, Ta (Li, Rb, Cs), Be, Sn, W, Mo, Bi, As → Cu, Zn, Pb → Sb, Hg, U. Series II (the Yangtze Series): pyroxene diorite (or gabbro)→ diorite or quartz diorite→ granodiorite (quartz monzonite) or monzonitic granite → granite →K-feldspar granite → grano-porphyry or quartz porphyry (syenitic porphyry or quartz syenitic porphyry) → intermediate-basic dikes; Fe → Cu(Au) → Mo(W) → Zn, Pb → Pb(Ag). There exists an evolutionary trend for each series.Obvious differences have been recognized between Series I and II. As for Series II, the bulk composition is close to that of andesite. Relatively high temperature of formation (980°-1,140℃), petrochemical enrichment in Mg and Ca, the composition of biotite characterized by the high content of magnesium, assemblages of accessory minerals (magnetite - sphene - apatite or magnetite - ilmenite - REE-rich zircon), trace elements predominated by Cl and Sr with ∑Ce > ∑Y in the rocks and accessory minerals, relatively high δEu (0.74-0.99) without depletion, δ18O < 10%, δ34S close to that of meteorite sulfur, relatively high content of platium-group elements (> 10 times) characteristic of mantle derivation, very low 87Sr/86Sr (0.7036-0.7085) and the occurrence of intermediate-basic dikes (similar to basalts in composition) in the final evolutionary stage are sufficiently enough to show that Series II has a material source in the lower crust or in the upper mantle. The fact that87Sr/86Sr > 0.7037 in most cases implies a partial contamination by crystal materials. As for Series I, the bulk composition is consistent with that of normal granites. Relatively low temperature of formation (600°- 680℃), chemical composition noted for high SiO2 and K2O, complicated accessory mineralogy and assemblages (magnetite-ilmenite-zircon

关 键 词：花岗岩 地质演化 偏中酸性岩 同位素年龄 

分 类 号：P588.121[天文地球—岩石学] P597.3[天文地球—地质学]