摘要
The Boziguoer A-type granitoids in Baicheng County,Xinjiang,belong to the northern margin of the Tarim platform as well as the neighboring EW-oriented alkaline intrusive rocks.The rocks comprise an aegirine or arfvedsonite quartz alkali feldspar syenite,an aegirine or arfvedsonite alkali feldspar granite,and a biotite alkali feldspar syenite.The major rock-forming minerals are albite,K-feldspar,quartz,arfvedsonite,aegirine,and siderophyllite.The accessory minerals are mainly zircon,pyrochlore,thorite,fluorite,monazite,bastnaesite,xenotime,and astrophyllite.The chemical composition of the alkaline granitoids show that SiO2 varies from 64.55% to 72.29% with a mean value of 67.32%,Na2O+K2O is high (9.85%-11.87%) with a mean of 11.14%,K2O is 2.39%-5.47% (mean =4.73%),the K2O/Na2O ratios are 0.31-0.96,Al2O3 ranges from 12.58% to 15.44%,and total FeOT is between 2.35% and 5.65%.CaO,MgO,MnO,and TiO2 are low.The REE content is high and the total SREE is (263-1219) ppm (mean =776 ppm),showing LREE enrichment and HREE depletion with strong negative Eu anomalies.In addition,the chondrite-normalized REE patterns of the alkaline granitoids belong to the "seagull" pattern of the right-type.The Zr content is (113-1246) ppm (mean =594 ppm),Zr+Nb+Ce+Y is between (478-2203) ppm with a mean of 1362 ppm.Furthermore,the alkaline granitoids have high HFSE (Ga,Nb,Ta,Zr,and Hf) content and low LILE (Ba,K,and Sr) content.The Nb/Ta ratio varies from 7.23 to 32.59 (mean =16.59) and the Zr/Hf ratio is 16.69-58.04 (mean =36.80).The zircons are depleted in LREE and enriched in HREE.The chondrite-normalized REE patterns of the zircons are of the "seagull" pattern of the left-inclined type with strong negative Eu anomaly and without a Ce anomaly.The Boziguoer A-type granitoids share similar features with A1-type granites.The average temperature of the granitic magma was estimated at 832-839℃.The Boziguoer A-type granitoids show crust-mantle mixing and may have formed in an anorogenic intraplate tectonic setting under high-temperature,anhydrous,and low oxygen fugacity conditions.
The Boziguoer A-type granitoids in Baicheng County,Xinjiang,belong to the northern margin of the Tarim platform as well as the neighboring EW-oriented alkaline intrusive rocks.The rocks comprise an aegirine or arfvedsonite quartz alkali feldspar syenite,an aegirine or arfvedsonite alkali feldspar granite,and a biotite alkali feldspar syenite.The major rock-forming minerals are albite,K-feldspar,quartz,arfvedsonite,aegirine,and siderophyllite.The accessory minerals are mainly zircon,pyrochlore,thorite,fluorite,monazite,bastnaesite,xenotime,and astrophyllite.The chemical composition of the alkaline granitoids show that SiO2 varies from 64.55% to 72.29% with a mean value of 67.32%,Na2O+K2O is high (9.85%-11.87%) with a mean of 11.14%,K2O is 2.39%-5.47% (mean =4.73%),the K2O/Na2O ratios are 0.31-0.96,Al2O3 ranges from 12.58% to 15.44%,and total FeOT is between 2.35% and 5.65%.CaO,MgO,MnO,and TiO2 are low.The REE content is high and the total SREE is (263-1219) ppm (mean =776 ppm),showing LREE enrichment and HREE depletion with strong negative Eu anomalies.In addition,the chondrite-normalized REE patterns of the alkaline granitoids belong to the "seagull" pattern of the right-type.The Zr content is (113-1246) ppm (mean =594 ppm),Zr+Nb+Ce+Y is between (478-2203) ppm with a mean of 1362 ppm.Furthermore,the alkaline granitoids have high HFSE (Ga,Nb,Ta,Zr,and Hf) content and low LILE (Ba,K,and Sr) content.The Nb/Ta ratio varies from 7.23 to 32.59 (mean =16.59) and the Zr/Hf ratio is 16.69-58.04 (mean =36.80).The zircons are depleted in LREE and enriched in HREE.The chondrite-normalized REE patterns of the zircons are of the "seagull" pattern of the left-inclined type with strong negative Eu anomaly and without a Ce anomaly.The Boziguoer A-type granitoids share similar features with A1-type granites.The average temperature of the granitic magma was estimated at 832-839℃.The Boziguoer A-type granitoids show crust-mantle mixing and may have formed in an anorogenic intraplate tectonic setting under high-temperature,anhydrous,and low oxygen fugacity conditions.
基金
supported by the projects of "The detailed geological survey of Nb-Ta ore deposits in Boziguoer, Baicheng County, Xinjiang" and "China Geological Survey (project No. 1212011120160)"