REE investigatious of apatites from two series of granitic rocks, including more than ten types of rock and several tons of rack masses in eight south China's provinces permit us to have come to some new understan...REE investigatious of apatites from two series of granitic rocks, including more than ten types of rock and several tons of rack masses in eight south China's provinces permit us to have come to some new understanding abd hence the following conclusions have been drawn. Apatitos from different series of granitic rocks show significant differences in REE distribution, probably due to different source materials. Therefore, REE distribution characteristics can he used to distinguish source-different granitic rocks. The apatites in granites of the Nanling series (derived from the shallow erust) have a lower eontont of ∑REE (4571 ppm on everage). In the apatites Y is the highest of the REE group.∑Y is rich relative to ∑ Ce, thua giving rise to relatively low ∑ Ce/∑Y ratio (0.68 on average) Eu shows strong depletion, and..5 Eu is extremely law (0.135 on average).The REE distribution patterns are represented by the “V”-shaped symmetric curves.The apatites in granitos of the Changjiang (Yangtze) series are relatively high in ∑REE (8571.3 ppm on average) Ce is the highest of the REE group. ∑Ce is rich relative to ∑Y and the ∑Ce/∑Y is relatively high (7.15 an average) in the apatites from the Yangtze series. The chondrite-normalized REE distribution patterus are charactorized by the rightward-inclined curves.展开更多
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→...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 monazitexenotime-zircon),bioite with hih content of iron,trace elements predominated by F,Li,Rb(Cs)and Be,with ∑Y>∑Ce,relatively low δEu with distinct depletion,δ^18O>10%,greatly varying δ^34C,low content of platium-group elements typical of mantle derivation,high ^37Sr/^38Sr(0.7112-0.7360),in conjunetion with the consideration of mineralization of REE,Nb,Ta,Sn,Be,W,Bi,etc.typical of crustal origin,indicate that the continental crust is the main material souree for Series I.The possibility,however,cannot be ruled out that a small amount of upper mantle-derived materials took part in this process as has been indicated by lower ^37Sr/^36Sr(=0.7100),part of δ^34S close to that of meteorite sulfur and the occurrence of intermediate-basic dikes(similar to basalts in composition)in the final evolutionary stage.It is of intereast to note that granitoid rocks of these series in Southeast China show considerable dissimilarities with those in Japan and Australia in ^37Sr/^36Sr,δ^18O and δ^34S values.展开更多
In China,rare earth elements(REE)are widely utilized in agriculture.Many studieson REE toxicology,pharmacology and biochemistry have been made both at home andabroad.However,REE damage to the functions of human memory...In China,rare earth elements(REE)are widely utilized in agriculture.Many studieson REE toxicology,pharmacology and biochemistry have been made both at home andabroad.However,REE damage to the functions of human memory,thinking andreasoning in animal experiments cannot be directly demonstrated.展开更多
文摘REE investigatious of apatites from two series of granitic rocks, including more than ten types of rock and several tons of rack masses in eight south China's provinces permit us to have come to some new understanding abd hence the following conclusions have been drawn. Apatitos from different series of granitic rocks show significant differences in REE distribution, probably due to different source materials. Therefore, REE distribution characteristics can he used to distinguish source-different granitic rocks. The apatites in granites of the Nanling series (derived from the shallow erust) have a lower eontont of ∑REE (4571 ppm on everage). In the apatites Y is the highest of the REE group.∑Y is rich relative to ∑ Ce, thua giving rise to relatively low ∑ Ce/∑Y ratio (0.68 on average) Eu shows strong depletion, and..5 Eu is extremely law (0.135 on average).The REE distribution patterns are represented by the “V”-shaped symmetric curves.The apatites in granitos of the Changjiang (Yangtze) series are relatively high in ∑REE (8571.3 ppm on average) Ce is the highest of the REE group. ∑Ce is rich relative to ∑Y and the ∑Ce/∑Y is relatively high (7.15 an average) in the apatites from the Yangtze series. The chondrite-normalized REE distribution patterus are charactorized by the rightward-inclined curves.
文摘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 monazitexenotime-zircon),bioite with hih content of iron,trace elements predominated by F,Li,Rb(Cs)and Be,with ∑Y>∑Ce,relatively low δEu with distinct depletion,δ^18O>10%,greatly varying δ^34C,low content of platium-group elements typical of mantle derivation,high ^37Sr/^38Sr(0.7112-0.7360),in conjunetion with the consideration of mineralization of REE,Nb,Ta,Sn,Be,W,Bi,etc.typical of crustal origin,indicate that the continental crust is the main material souree for Series I.The possibility,however,cannot be ruled out that a small amount of upper mantle-derived materials took part in this process as has been indicated by lower ^37Sr/^36Sr(=0.7100),part of δ^34S close to that of meteorite sulfur and the occurrence of intermediate-basic dikes(similar to basalts in composition)in the final evolutionary stage.It is of intereast to note that granitoid rocks of these series in Southeast China show considerable dissimilarities with those in Japan and Australia in ^37Sr/^36Sr,δ^18O and δ^34S values.
基金supported by the ResourcesEnvironmental Bureau, Chinese Academy of Sciences.
文摘In China,rare earth elements(REE)are widely utilized in agriculture.Many studieson REE toxicology,pharmacology and biochemistry have been made both at home andabroad.However,REE damage to the functions of human memory,thinking andreasoning in animal experiments cannot be directly demonstrated.
