中国大陆科学钻探主孔榴辉岩中石榴石和绿辉石原位激光探针分析及其成岩成矿指示意义
In situ LA-ICP-MS analysis for garnet and omphacite of eclogites from the main hole of CCSD: Implications for petrogenesis and mineralization
-
摘要: 本文以中国大陆科学钻探主孔0～2000m岩芯中的榴辉岩为对象,运用EMPA和LA-ICP-MS技术,系统测定了榴辉岩中石榴石和绿辉石的主量与微量元素组成,并据此讨论了它们的成岩成矿意义.研究结果表明,CCSD主孔榴辉岩中石榴石富重稀土和Sc、Y、Co,而绿辉石则富中稀土和Pb、Sr、V,石榴石和绿辉石的高场强元素(特别是Nb、Ta)含量均很低.石榴石存在不同程度的Ce负异常,指示榴辉岩的形成过程中卷入有地表氧化条件下形成的风化沉积物.石榴石具有低的Zr/Y比值,绿辉石普遍具有高的Sr含量,这些特征说明榴辉岩(特别是高钛榴辉岩)的原岩可能为遭受过壳源物质混染与交代的富集地幔部分熔融的产物.高钛与低钛榴辉岩中石榴石和绿辉石在主量及微量元素组成上存在一定差别,总体而言,高钛榴辉岩中石榴石具高的MgO含量和较高的MgO/TFeO比值,以及较高的稀土和Sc含量,而绿辉石则相对富TFeO、MnO,并具有较高的Sr、Zr、Hf含量.高钛榴辉岩中石榴石和绿辉石常出现不同程度的Eu正异常,Cr含量均显著低于低钛榴辉岩.综合分析表明,高钛榴辉岩的原岩最可能为富斜长石的辉长质侵入岩,原岩组成的差异应是导致二类榴辉岩中石榴石和绿辉石矿物化学组成存在差异的主要原因.
-
-
[1] Becker H,Jochum KP,Carlson RW.2000. Trace element fraetionation during dehydration of eclogitea from high-pressure terranes and the implications for element fluxes in aubduetion zones.Chem.Geol.,163:65 -99
[2] Boynton WV.1984. Geochemistry of the rare earth dements:meteorite studies.In:Henderson P (ed).Rare Earth Elements Geochemistry.Amsterdam:Elsercier,63 -144
[3] Chen B,Jabn BM,Ye K,Liu JB.2002. Cogenetic relationship of the Yangkou gabbro to granite unit,Su-Lu terrane,eastern China,and implications for UHP metamorphism.J.Geol.Soc.London,159:457-467
[4] Chen NS,Sun M,You ZD,Malps J.1998. Well-preserved garnet growth zoning in granulite from the Dabie Mountains,central China.J.Metsmorph.Geol.,16:213-222
[5] Cheng ZX.1990. Basic characteristics of the Donghni eclogite type rntile deposit in Jiangsu province.Mineral Deposits,9(1):86-90 (in Chinese with English abstract)
[6] Chernoff CB,Carlson WD.1999. Trace element zoning as a record of chemical disequilibrium during garnet growth.Geology,27(6):555 -558
[7] Coleman RG,Lee DE,Bcatty LB,Brannock WW.1965. Eclngites and eclogites:their differences and similarities.Geol.Soc.Amer.Bull.,76:483 -508
[8] Drake M,Weill D.1975. Partition of Sr,Ba,Ca,Y,Eu2 ,Eu3 other REE between plaginclase feldspar and magmatic liquid:an experimental study.Geochim.Cesmochim.Acte,39:689-712
[9] Foley SF,Barth MG,Jenner GA.2000. Ruffle/melt partition coefficients for trace elements and an assessment of the influence of rutile on the trace element characteristics of subduction zone magmas.Geochim.Cosmochim.Acta,64:933 -938
[10] Griffin WL,O\'Reilly SY,Ryan CG,Gaul O,Ionov DA.1998. Secular variation in the composition oF subcontinental mantle:geophysical and geodynaimc implications.In:Braun J,Dooley J,Golchy B,vander Hilet R,Klootwijk C.(eds.).Structure and Evolution of the Australian Continent,Am.Geophys.Union.,Washington,1-26
[11] Hattori KH,Guillet S.2003. Volcanic fronts form as a consequence of serpentinite dehydration in the forearc mantle wedge.Geology,31:525 -528
[12] Hanri EH,Wngenr TP,Grove TL.1994. Experimental and natural partitioning of Th,U,Pb and other trace elements between garnet,clinopyroxene and basaltic melts.Chem.Geol.,117:149-166
[13] Huang JP,Ma DS,Liu C,Wang H.2002. Rutile deposit in eclngite of ultra-high pressure metamorphic belt in the northeast of Jiangsu province and ore genesis.J.Nanjing Uni.(Natural Sciences),38 (4):514 -524 (in Chinese with English abstract)
[14] Jacob DE,Schmickler B,Schulze DJ.2003. Trace element geochemistry of coesite-bearing eclogites from the Roberts Victor kimbedite,Kanpvaal craton.Lithos,71:337-351
[15] Jaim BM.1998. Geochemical and isotopic characteristics of UHP eclogites and ultramafic rocks of the Dabie orogen.In:Hacker BR,Lion JG (eds.).When Continents Collide:Geochemistry of Ultrahigh-Pressure Rocks.Khiwer Academic Publishing,Dordrecht,203-209
[16] Klemme S,Prowatke S,Hametuer K,Gunther D.2005. Partitioning of trace elements between rutile and silicate melts:Implications for subduetion zones.Geochim.Cesmochim.Acta,69(9):2361-2371
[17] Kngiso T,Tatsumi Y,Nakano S.1997. Trace element transport during dehydration processes in the subdueted oceanic crust:1. Experiments and implications for the origin of island basalts.Earth Planet.Sci.Lett.,148:193-205
[18] Liu XM,Gao S,Yuan HL,Hattendorf B,Gunther D,Chen L,Hu SH.2002. Analysis d 42 major and trace elements in glass standard reference materials by 193nm LA-ICPMS.Acta Petrologica Sinica,18(3):408-418 (in Chinese with English abstract)
[19] Luo Y,Gan S,Yuan HL,Liu XM,G黱ther D,Jin ZM,Sun M.2004. Ce anomaly in minerals of eclogite and garnet pyroxenite from Dahie-Sulu ultrahigh pressure metamorphic belt:Tacking subducted sediment formed under oxidizing cenditions.Science in China (Ser.D,Earth Sciences),47(10):920-930
[20] Messiga B,Tribuzio R,Bottazzi P,Ottolini L.1995. An ion microprobe study on trace element composition of clinopyroxenes from blueschist and eclogitized Fe-Ti-gabbros,Ligurian Alpa,northwestern Italy:some petrologic considerations.Geochim.Cosmochim.Acta,59 (1):59 -75
[21] Morimoto N,Fabries J,Fergnson AK,Ginsburg Ⅳ,Ross M,Seifert FA,Znssman J,Aoki K,Gottardi G.1988. Nomenclature of pyroxenes.Amer.Min.,73:1123-1133
[22] O\'Reilly SM,Griffin WL.1995. Trace-element partitioning between garnet and clinopyroxene in mantle-derived pytoxenites and eclogites:P-T-X controls.Chem.Geol.,121:105 -130
[23] Qiu JS,Wang RC,Jiang SY,Hu J,Zhang XL,Ni P.2006. Geochemical comparison between high-Ti and low-Ti eclogites from the main hole of the Chinese Continental Scientific Drill Project and its implications for rntile mineralization.Acta Petrolngica Sinica,22 (7):1875 -1882 (in Chinese with English abstract)
[24] Roden MF,Shimizu N.2000. Trace element abundances in mantle-derived minerals which bear on compositional complexities in the lithosphere of the Colorado Plateau.Chem.Geol.,165:283 -305
[25] Sassi R,Harte B,Carswell DA.2000. Trace element distribution in central Dabie eclogites.Contrib.Mineral.Petrol.,139:298 -315
[26] Scambelluri M,Fiebig J,Malaspina N,Muntener O,Pettke T.2004. Scrpentinite subduction:implications for fluid processes and trace element recycling.Inter.Geol.Rev.,46:559 -613
[27] Schmickler B,Jacob DE,Foley SF.2004. Eologite xenoliths from the Kuruman kimberlites,South Africa:geochemical fingerprinting of deep subduction and cumulate processes.Lithos,75:173-207
[28] Spandler C,Hermann J,Arculns R,Mavrogenes J.2003. Redistribution of trace elements during protrade metamorphism from lawzonite blueschist to eclogite facies:implications for deep subduction zone processes.Contrib.Min.Petrol.,146:205-222
[29] Spear FS,Kohn MJ.1996. Trace element zoning in garnet as monitor of crustal melting.Geology,24(12):1099 -1102
[30] Spear FS.1991. On the interpretation of peak metamorphic temperatures in light of garnet diffusion during cooling.J.Metamorph.Geol.,9:379-388
[31] Stalder R,Foley SF,Brey GP,Horn I.1998. Mineral-aqneons fluid partitioning of trace elements at 900-1200℃ and 3.0-5.7 GPa:New experimental data for garnet,clinopyroxene,and ruffle,and implications for mantle metnsomatism.Geochim.Cesmochim.Acta,62:1781-1801
[32] Taylor SR,McLennan SN.1985. The Continental Crust:Its Composition and Evolution.Blackwell Scientific Publications,263 -265.
[33] XuJ,Chen YC,Wang DH,Yu JJ,Li CJ,Fu XJ,Chen ZY.2004. Titanium mineralization in ultrahigh-pressure metamorphic rocks from Chinese Continental Scientific Drilling Project.Acta Petrologica Sinica,20(1):119 -126 (in Chinese with English abstract)
[34] You ZD,Su SG,Liang FH,Zhang ZM.2004. Petrography and metamorphic deformation history of the ultrahigh-pressure metamorphic rocks from the 100～2000m core of Chinese Continental Scientific Drilling,China.Acts Petrologica Sinica,20(1):43 -52 (in Chinese with English abstract)
[35] Zhang ZM,Xu ZQ,Liu FL,You ZD,Shen K,Yang JS,Li TF,Chen SZ.2004. Geochemistry of eclogites from the main hole (100 ～ 2050m) of the Chinese Continental Scientific Drilling Project.Acta Petrologica Sinica,20 (1):27-42 (in Chinese with English abstract)
[36] Zhang ZM,Xiao YL,Shen K,Gan J.2005a.Garnet growth compositional zonation and metamorphic P-T path of the uhrabigh-pressure eclogites from the Sulu orogenic belt,eastern Central China.Acta Petrologica Sinica,21(3):809-818 (in Chinese with English abstract)
[37] Zhang ZM,Zhang JF,Xu ZQ,Liu FL,Yang JS,Xian YL,Shen K.2005b.Petrology of eclogites from the main hole of the Chinese Continental Scientific Drill Project.Geology in China,32(2):205 -217 (in Chinese with English abstract)
[38] Zheng JP,Zhang RY,Griffin WL,Linu JG,O\'Reilly SY.2005. Heterogeneous and metnsomatized mantle recorded by trace elements in minerals of the Donghai garnet peridotites,Sulu UHP terrane,China.Chem.Geol.,221:243 -259
[39] Zheng YF,Fu B,Li YL,Xian YL,Li SG.1998. Oxygen and hydrogen isotope geochemistry of ultrahigh pressure eclogites from the Dabie Mountains and the Sulu terrane.Earth Planet.Sci.Lett.,155:113 -129
[40] Zbeng YF,Gong B,Li YL,Wang ZR,Fu B.2000. Carbon concentrations and isotopic ratios of eclogites from the Dabie and Sulu terranes in China.Chem.Geol.,168:291 -305
[41] Zong KQ,Liu YS,Liu XM,Zhang BH.2006. In situ trace element geochemistry of single minerals in eclogites from the CCSD main hole (100 ～ 1100m).Acta Petrologica Sinica,22(7):1891-1904 (in Chinese with English abstract)
[42] 程振香.1990.江苏东海榴辉岩型金红石矿床基本特征.矿床地质,9(1):86-90
[43] 黄建平,马东升,刘聪,王辉.2002.苏北超高压变质带榴辉岩型金红石矿床及其成因.南京大学学报(自然科学),38(4):514 -524
[44] 柳小明,高山,袁洪林,Hattendorf B,Gunther D,陈亮,胡圣红.2002.193nm LA-ICPMS对国际地质标准参考物质中42种主量和微量元素的分析.岩石学报,18(3):408-418
[45] 邱检生,王汝成,蒋少涌,胡建,张晓琳,倪培.2006.中国大陆科学钻探主孔高钛与低钛榴辉岩地球化学特征对比及其对金红石成矿的指示意义.岩石学报,22(7):1875-1882
[46] 徐珏,陈毓川,王登红,余金杰,李纯杰,傅旭杰,陈振宇.2004.中国大陆科学钻探主孔100～2000米超高压变质岩中的钛矿化.岩石学报,20(1);119-126
[47] 游振东,苏尚国,梁凤华,张泽明.2004.中国大陆科学钻探主孔100 ～2000米超高压变质岩岩相学特征与变质变形史.岩石学报,20(1):43-52
[48] 张泽明,许志琴,刘福来,游振东,沈昆.杨经绥,李天福,陈世忠.2004.中国大陆科学钻探工程主孔100～2050m榴辉岩岩石化学研究.岩石学报,20(1):27-42
[49] 张泽明,肖益林,沈昆,高勇军.2005a.苏鲁超高压榴辉岩的石榴石生长成分环带及变质作用P-T轨迹.岩石学报,21(3):809～ 818
[50] 张泽明,张金凤,许志琴,刘福来,杨经绥,肖益林,沈昆.2005b.中国大陆科学钻探工程主孔榴辉岩的岩石学研究.中国地质,32 (2):205-217
[51] 宗克清,刘勇胜,柳小明,张斌辉.2006. CCSD主孔100～1100m榴辉岩中单矿物的原位微区微量元素地球化学研究.岩石学报,22 (7):1891-1904
-
计量
- 文章访问数: 5915
- PDF下载数: 5768
- 施引文献: 0
下载: