粤西眼球状花岗岩FeS2拉曼光谱特征及意义

T here are large numbers of pyrite in the mass ， w hich have been divided into ４ types according to their forms and re‐ lationship between each other as follow s ：（１ ） Banded Pyrite ， arranges along belt ，bar or line ［Fig畅 １ （c ）］ ． （２ ） Deformed Pyrite ， looks like deformed rhombohedron ， and distributed widely ［Fig畅 １（d）］ ．（３） Euhedral Pyrite ，its crystal are near‐ ly cube or rhombohedron ［Fig畅 １ （e）］ ．（４ ） Alterated Pyrite ， their shape are irregular for w hich maybe suffered from weathering in surface ［Fig畅 １（f ）］ ．
Micro‐Raman Spectral Characteristics and Implication of FeS 2 from Augen Granites in West Of Guangdong
A NNG Da‐peng３
１ ．School of Resources and Environmental Engineering ，A nhui U niversity ， Hefei ２３０６０１ ，China ２ ．Key Lab of Geological Process and M ineral Resource Survey of Guangdong ，G uangzhou ５１０２７５ ，China ３ ．Research Institute ，Shenzhen Branch of China National Offsho re Oil Corpo ration Limited ，Guangzhou ５１０２４０ ，China
Received ：２０１３‐１０‐１１ ；accepted ：２０１４‐０１‐２０
Foundation item ：M ajo r Prjects G rants of China Geological Survey （１２１２０１１０８５４１２）and G rants of t he N ational Natural Science Foundation of China（４１２７３０４０ ）
Abstract Some FeS２ samples among Augen granite from Guanshanzhang mass in the west of Guangdong Prov ‐ ince were retrieved to characterize the spectral signature of Raman ．T he results show that three distinct scat‐ tering modes active of Fe‐［S２ ］２ － Liberational M otion （ Eg ） ， Fe‐［S２ ］２ － Stretching M otion （ Ag ） and S — S Stretching M otion （ Tg ） are observed from all samples ． Detailed analyses indicate that Raman shift （Δ ν） ， M odes intensity （I） and full width at half maximum （FW HM ） are different betw een each type pyrite ． T he spectra show that there are three peaks respectively about ３１８ cm － １ （Δ ν１ ） ，３８１ cm － １ （Δ ν１ ） and ４４０ cm － １ （Δ ν１ ） in Banded pyrite and three peaks in others samples about ３４４ cm － １ （Δ ν１ ） ，３７９ cm － １ （Δ ν１ ） and ４３０ cm － １ （Δ ν１ ） ． U nder compression to Alterated pyrite ，all modes （ Eg ， Ag and Tg ） shift continuously to higher frequencies from Deformed samples to Euhedral type ． Eg mode is much intenser than Ag mode as w ell as the latter is in ‐ tenser than Tg mode too in Banded samples （IEg 冲 IAg 冲 ITg ） ，the intensity of Ag mode is higher than Eg mode ， and the latter is much higher than Tg mode in other samples （ IAg ＞ IEg 冲 ITg ） ．Compared w ith Alterated py‐ rite ，all modes of Eg ，Ag and Tg intense continuously to higher frequencies from Euhedral samples to Deformed type ．T hose spectral characteristics above evidence that ，the Raman shift and intensity of Banded samples is similar to marcasite ，w hile those of others show characteristics of the pyrite ．T he crystallization temperature of Euhedral pyrite is higher than Deformed as well as Euhedral is higher than Alterated too ．T he formation pres‐ sure of Euhedral samples is higher than Alterated pyrite the same as Deformed pyrite hingher than Euhedral one too ．T hus ，T he authors’ studies suggest that the forming conditions of FeS ２ in Guanshanzhang mass expe‐ rienced marcasite period → high‐pressure pyrite period → high‐temperature pyrite period → Alterated pyrite peri‐ od ．
iencely ，w e called them augen granite tentatively ．T his study investigates different forms pyrites and characterizes its Ra‐ man spectral w hich selected from Guanshanzhang M ass ， in order to interpret information of crystallization environment ， and understand emplacement process of Augen Granites ．
Keywords Raman ；Pyrite ；marcasite ；Augen granite ；Qinzhou‐hangzhou belt 中图分类号 ：P６１４ ，O４３３ 文献标识码 ：A DOI ：１０畅 ３９６４ ／j畅 issn畅 １０００‐０５９３（２０１４）０９‐２４３９‐０５
Guanshanzhang M ass is situated in the northern part of Xinan tow n in Lianjiang city of Guangdong province ．Struc‐ turally ，it was regarded as the southwestern section of the Qinzhou‐hangzhou belt （a great M etallogenic belt between Yang tze and cathaysia ）［５］ ． A lot of achievements of survey outdoor show that it is covered with middle‐lower Devonian unconformity ， and has later been intruded by Yanshanian mass of Pozaiying ， Changjing and Shetang mass［６］ ． It is
Biography ：A N Yan‐fei ，（１９８２ — ） ，PhD of A nhui U niversity e‐mail ：anyanfei０５５７＠ １６３ ．co m
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光谱学与光谱分析 第 ３４ 卷
matitic‐granite ．But in recent years ，with increasing number reports on magmatic zircon ages of ４１０ ～ ４３０ M a［１‐４］ ，more and more researchers accepts that these rocks belong to Cale‐ donian ．Since gensis controversial among local paragneiss ，fo‐ liated ortho‐granites and migmatit remains ，its processes and mechanism of crystallization and intrusion are researched weakly ． For differ previous names and arguments conven‐