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四川盆地中部平昌县龙岗地区节理特征及应力分析_陈灿

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(Volume)30, ù(Number)3,9(Total)121 €þûF :(Pages)44- 51,2010,9,(Sept,2010) JMINERAL PETROL là ° ù:2010- 01- 12; ¿í ° ù:2010- 08- 05T€eº:ç š, o,25ß,«V3,/¹É 川中平昌县龙岗地区构造变形较弱,岩层近水平,地表构造变形多见节理b通过对龙岗地区2000余条节理面及擦痕的观测a统计a分析,依据节理的发育特征和运动性质,发现该区发育的NE-SW和NW-SE向节理aNNW-SSE 和NEE-SWW向节理aNW-SE至NNW-SSE和NE-SW向节理以及NNE-SSW和NWW-SEE向节理为4套平面X共轭剪节理b节理中以近EW走向最为发育,以走滑为主,逆冲次之b根据其相互切割关系,运用构造解析的方法,结合区域地质背景,对百余条多期(平面X节理及剖面节理)剪节理构造的古应力场(状态)进行反演,推测龙岗地区构造应力场的主压力发生了EW 向yNW-SE向yNS向yNE-SW向的多次转换b=1oM> 四川盆地;龙岗地区;节理;构造应力场Ïms Ë|:P542+1 33 ÓDSM’: AÓcI|:1001- 6872(2010)03- 0044- 080 引 言樫 Øë¯/‹ ïÆÙ –i"šp,ŒT¹¹ T†ûFÏ?âK½m¹òö14©Ä¥º>½mFig. 2 Rose diagramsshowing the strikes of jointsindifferent observationspots in the Longgang areaôRl¿10b,/M™± Ð,Ç?âµ ÐÂä,ïNW-SE_„NE-SW_ †î¶™(m1)b¹Vö1]Ï)¾d£ª,†¹ç-çâ ä v%ìû‡ÉF éûaÉF éûÐ,£ ä Cûºª,Cç, äx éû;/†¹ç, ä vÉFF‡ éûÐ,£ ä Cûºª,C,£ äx éû, éû¸†c C äb¹ª ÜÏ,[®‹McŸ åM™¹ö,™î ù«Øa ½ Ø/, åÁ  l,¹Vnb3 节理发育特征ô CÕ¹ u ¯ ž“F7“]¥« Ø?âƒ,Ç300 km2¥ùî u = ƒÂ216ñ4©Ä(m2),4©ž2000ÅH« ØbCÕ¹ u¹VM™  Ð,[( ù)« Ø/M™¹ö,« Øë ܰaü%  ,[âgŸ å¹ö,nfŸ å« Øëb98ü%[1 m~ 3 m¹ö,¨ª éûÏü%Vr10 mb« ØW [ 6 m¥ }nbM¿ÑŸ Ú¥ È Ð Cûª,¨ª( v) éû =¥« ØÁ×ç V L,¿‹ ïs÷¹ V LbyN,É›”d9„sH,­{ Cû =ü%½mAU« ØF¥ü%ZÊ,[ê„d=*âÁ3¥17ê¥â‹ ïâ e ï, Ÿ1þÜð v_¤Á3¥1 2ê7_¥â‹ï,[# Ÿ1 U4¥17 2¥â‹ ï©3ñöZ_¹‹ ïT¨bƒtâ‹ ï¹ö¥‹ ïÆV ©ø_©¹ =¾É*â,‹ ï Žô, í,©.Æ/ ù« Ø/+˜# il[J]. €þûF,2009,29(3):83-90.[2] Á;Ò,Û? *.¹+ ©¹Ï3}/F†ßF# c² /¥ eÅT¨[A].½ ë.CÊ ö/ ö{¥Ì „¹+ ©¹¥™îÐÄ[C].îû:îû S/vÐñ,1994,455.[3] Turner F J. Nature and dynamicinterpretation of deformation lamellae in calcite of three marbles[J].AmJ Sci,1955,251:276-298.[ 4] Aleksandrowski P.Graphical determinationof principal stressdirectionsfor slickensidelineation population:an attempt to modify Arthaud's Method[J].J Struc Geol,1985,7:73-82.[5] Angelier J.Determination of the mean principal directions of stress for a given fault population[J].Tectonophys,1979,56:1-26.[6] Anderson E M.The Dynamicsof Faulting and Dyke Formation with Applications toBritain[M].Edinburgh:Oliver and Boyd,1942,191.[7] > ¨,>Žô, ÙÆó,©. 2vØ öÂ{ύ3}/‹ ïÆ¥« Øùî[J].îû ØývÐÐ,2005,8(4):345-350.[8] ß Ü·,>ñÔ,ñ£Ñ,©.Œ¹ u« Ø/+˜#³[J]. €þûF,2003,3(23):51-54.[9] Û? *,HZ3,Å v.² B/¹É ïÐs[M].îû S/vÐñ,1996,70.[10] Price N J.Foldand Joint Development inBrittle and Sem-i brittleRocks[M].Oxford:Pergamon Press, 1966,110-164.[11] Engelder T.Loading paths to joint propagation during cycle:and example of the Appalachian Plateau[J].Journal of Structural Geology,1985,7:459-476.[12]Ržð,¬ B-,b¥é,©.¹+ ©¹™îÐÄ[M].Ø:¹Éñ,1994,3,126-133.[13]£?~.ÏS»¹@¥/YqЋ ïÆ[J].»¹@ùî,1994,2(1):48-55.ISSN 1001- 6872(2010)03- 0044- 08; CODEN:KUYAE2Synopsisof the first author: Chen Can, female, 25 years old,a Ms of structural geology. Now she is engaged in the research ofstructurcdgeology.CHARACTERISTICSANDSTRESS ANALYSISOF JOINTS INTHE LONGGANGAREA OFPINGCHANGCOUNTY,CENTRALSICHUAN BASINCHEN Can, LIU Shun, HE Li, LIANG Qing-lingCollege of Geosciences, Chengdu University of T echnology, Chengdu 610059, ChinaAbstract: The deformation intensity in the Pingchang area of centralSichuan basin is relativelyweak characterized by horizontalstrata and occurrence of joints in the beds.Over 2000 joints arecounted,investigated and analyzed.Itis indicatedthat4sets ofplanconjugate jointsoccurred withthe strikes of NE-SW and NW-SE,NNW-SSE and NEE-SWW, NW-SE and NNW-SSE,NE-SW,NNE-SSW and NWW-SEE.Of the 4sets of conjugate joints, the E-W strike joints are the mostdeveloped ones with a dominant strikeslipcharacter andminor reversedslipcharacter.On the ba-sis of mutual truncation of joints, combined with the application of structural analysis, the paleo-stress field ofshear jointsis inversed.It is inferredthatthe principalcompressive stress inthe ar-ea changed from E-W direction yNW-SE directionySN direction to NE-SW direction.Key words: Sichuan basin;Longgang area; joint;structural stress field51 »30  »3 ùç š©:¹+ ©¹Ï† ÜÄECÕ¹ u« Ø+˜#‹ ïs。

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