嵩山路家沟花岗岩地球化学特征
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摘要
嵩山是前寒武纪地质研究的典型地区,路家沟片麻状奥长花岗岩体分布于嵩山君召乡北路家沟一带。该岩体富Na_2O、贫铁、镁质氧化物,Al_2O_3含量平均为13.78%,显示贫铝特征;重稀土强烈亏损,轻重稀土强烈分异,Eu出现轻微负异常,高Sr含量和高Sr/Y比值,Cr、Yb、Y含量较低,与新生代高硅埃达克岩地球化学特征相似;岩石Nb、Y、Rb、Th、La和Yb之间的关系特征和岛弧火山岩相似。地球化学特征表明路家沟岩体形成于岛弧或俯冲环境,因此推测是由新生的玄武质洋壳俯冲部分熔融而成。
The Lujiagou gneissic trondhjemite pluton is exposed in Junzhao, Songshan, Henan with grayish white color, fine-grained texture, gneissic texture and banded texture. The rock contains 2.96-3.66% Na_2O, 70.36-75.76% SiO_2, 12.69-15.52% Al_2O_3(average of 13.78%<15%) and is poor in Fe, Mg oxides. It is similar to Si-rich Cenozoic adakite with ΣREE of 27.02-177.53 ppm, depletion in HREE and enrichment in LREE, weak negative Eu anomaly, high Sr, high Sr/Y ratio, low Cr, Yb, Y. The Nb, Y, Rb, Th contents and La/Yb ratio are similar to those of island arc volcanic rock. These indicate that the Lujiagou trondhjemite pluton was emplaced in subducting oceanic crust setting.
The Lujiagou gneissic trondhjemite pluton is exposed in Junzhao, Songshan, Henan with grayish white color, fine-grained texture, gneissic texture and banded texture. The rock contains 2.96-3.66% Na_2O, 70.36-75.76% SiO_2, 12.69-15.52% Al_2O_3(average of 13.78%<15%) and is poor in Fe, Mg oxides. It is similar to Si-rich Cenozoic adakite with ΣREE of 27.02-177.53 ppm, depletion in HREE and enrichment in LREE, weak negative Eu anomaly, high Sr, high Sr/Y ratio, low Cr, Yb, Y. The Nb, Y, Rb, Th contents and La/Yb ratio are similar to those of island arc volcanic rock. These indicate that the Lujiagou trondhjemite pluton was emplaced in subducting oceanic crust setting.
引文
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[23]Rapp,R.P.,Shimizu,N.,Norman,M.D,Growth of early continental crust by partial melting of eclogite[J].Nature,2003,425,605-609.
[24]Gilbert N.Hanson.1971.The application of trace elementas to the petrogenesis of granitic composition.Earth and Planetary Science Letters,38(1):26-43
[2]张国伟,周鼎武,张延安,等.河南中部登封群-太华群构造序列对比[J].西北大学学报(前寒武系地质专辑)1982:1-21.
[3]劳子强.登封群剖面特征及其划分[J].河南地质,1989.7(3):20-26
[4]劳子强,王世炎,张良,等.嵩山地区前寒武纪地质构造特征与演化[M].中国环境科学出版社,1996.87 95
[5]郭安林.河南中部太古代登封花岗岩-绿岩地体中TTG质片麻岩与绿岩带关系及其地壳演化意义[J].地质论评,1988,34(2):123-131.
[6]周艳艳,赵太平,薛良伟,等.河南嵩山地区新太古代TTG质片麻岩的成因及其地质意义[J].岩石学报,2009,25(02):331-347.
[7]第五春荣,孙勇,等.河南登封地区嵩山石英岩碎屑锆石U-Pb年代学、Hf同位素组成及其它地质意义.科学通报,2008,53(18):2828-2839
[8]郭安林.河南中部太古宙登封花岗-绿岩地体中灰色片麻岩地球化学特征及其成因[J].矿物岩石,1989,3(02):18-26.
[9]Maniar PD,Poccoli PM.1989.Tectonic discrimination of granitoids.Geol.Soc.Am.Bull,101:635-643
[10]M.S.Drummond,M.J.Defant,P.K.Kepezhinskas.1996.Petrogenesis of slab-derived trondhjemite-tonalite-dacite/adakite magmas.Earth and Environmental Science Transactions of the Royal Society of Edinburgh.87(1-2)
[11]Martin H.1987.Petrogenesis of Archaean trondhjemites,tonalites and granodiorites from Eastern Finland:Major and trace element Geochemistry.Journal of Petrology,28:921-953
[12]M.-A.Gutscher,RenéC Maury,Jean-Philippe Eissen,Erwan Bourdon.2000.Can slab melting be caused by flat subduction?Geology.28(6):535-538
[13]Sun S.-s,W.F.Mc Donough.1989.Chemical and isotopic systematics of oceanic basalts:implications for mantle composition and processes.In Saunders SD and Norry MJ(eds.).Magatism in Ocean Basins.Geological Society,London,Special Publications.42:313-345
[14]Pearce JA,Harris NBW,Tindle AG.1984.Trace element discrimination diagrams for the tectonic interpretation of granitic rocks.Journal of Petrology,25:956-983
[15]Langford FF and Norin JA.1976.The development of the superior province of northwestern Ontario by merging island arcs Amer.Journal of Science,276:1023-1034
[16]Kamber BS and Collerson KD.2000.Role of“hidden”deeply subducted slabs in mantle depletion.Chemical Geology,166:241-254
[17]Atherton MP and Pertford N.1993.Generation of sodium-rich magmas from newly underplated basaltic crust.Nature 362:144-146
[18]Maniar PD,Poccoli PM.1989.Tectonic discrimination of granitoids.Geol.Soc.Am.Bull,101:635-643
[19]李江海,牛向龙,程素华,等.大陆克拉通早期构造演化历史探讨:以华北为例[J].地球科学,2006,03:285-293.
[20]Li J H,Niu X L,Cheng S H,et al.A study on the early tectonic evolution of the continental Craton:a case study of North China[J].2006,03:285-293.
[21]李孟江,等.华北克拉通北缘尚义地区新太古代TTG成因分析:洋壳玄武岩不同深度下熔融的产物[J].地质通报,2012.31(5):686-695.
[22]Li Mengjiang,Wang Renmin,Zhang Li.The northern margin of the North China Craton in Shangyi Neoarchaean TTG analysis:oceanic crust of basalt in different depth of molten product[J].geological bulletin,2012,31(5):686-695.
[23]Rapp,R.P.,Shimizu,N.,Norman,M.D,Growth of early continental crust by partial melting of eclogite[J].Nature,2003,425,605-609.
[24]Gilbert N.Hanson.1971.The application of trace elementas to the petrogenesis of granitic composition.Earth and Planetary Science Letters,38(1):26-43