CAJ | 학술논문

峨眉山为一断块山,因其宏伟、秀丽而著称,但峨眉断块山是如何形成的,缺乏系统深入的研究.基于1 B 25000工程地质测绘,较为系统地研究了峨眉山地质构造形迹及构造叠加特征,认为峨眉山抬升始于古近纪晚期,喜山运动第一幕(始新世中期末)峨眉山受青藏高原隆升的影响,在北西西-南东东向区域应力场作用下,形成北北东向褶皱及北东向断层,并上升成为剥蚀区.上新世以来,在近东西向区域压应力场作用下,钝锥形大峨山断块沿北东向峨眉山断层及北缘的北西向边界断裂不断向东强力楔入,断块前缘早期的北北东向构造受推挤,地层走向及倾向出现明显偏转:锥顶前方龙门洞-报国寺一带地层由早期的北北东走向倾南东的中生代地层转为南北走向,地层出现倒转(西倾),而远离断块端部的地层仍然为正常产状.与此同时,锥顶北侧尖尖石背斜发生移褶,形成北西向褶皱和断层,而断块南侧峨眉山断层发生逆冲兼走滑活动.第四纪以来峨眉山间歇性强烈抬升,经历至少10次强烈抬升事件,逐渐形成现今地貌.新生代以来,峨眉山断层两盘地层水平位错累计达4 km,垂直位错累计达6 km.
아미산위일단괴산,인기굉위、수려이저칭,단아미단괴산시여하형성적,결핍계통심입적연구.기우1 B 25000공정지질측회,교위계통지연구료아미산지질구조형적급구조첩가특정,인위아미산태승시우고근기만기,희산운동제일막(시신세중기말)아미산수청장고원륭승적영향,재북서서-남동동향구역응력장작용하,형성북북동향습추급북동향단층,병상승성위박식구.상신세이래,재근동서향구역압응력장작용하,둔추형대아산단괴연북동향아미산단층급북연적북서향변계단렬불단향동강력설입,단괴전연조기적북북동향구조수추제,지층주향급경향출현명현편전:추정전방룡문동-보국사일대지층유조기적북북동주향경남동적중생대지층전위남북주향,지층출현도전(서경),이원리단괴단부적지층잉연위정상산상.여차동시,추정북측첨첨석배사발생이습,형성북서향습추화단층,이단괴남측아미산단층발생역충겸주활활동.제사기이래아미산간헐성강렬태승,경력지소10차강렬태승사건,축점형성현금지모.신생대이래,아미산단층량반지층수평위착루계체4 km,수직위착루계체6 km.
@@@@The Mt. Emei is a fault y block mountain, w hich is famous for its great and beaut iful scenes, but its formation is lack of systematic studies. Based on the engineering geologic mapping of 1:25000 scale, the geological structure features and character2 ist ics of structural superposition are systematical y studied in this paper. T he uplift of Mt. Emei began in the end of the Eocene, i. e. , during t he H imalayan movement of the first epoch, under the pressure of NWW2SEE regional geo2stress, the NNE strike folds and NE faults have been formed and uplift ed and became t he erosion area. Since the Neocene, under the regional pressure of nearly EW geo2stress field, the blunt2cone Daeshan fault y block was wedging eastward along the NE Emei mountain faults and the NW boundary faults on the nort hern margin, and the early NNE strike strata of the block frontier bent anti2clockw ise, resulting in diversion of the st rike and dip direction of st rata. The strike of the strata in the f rontier area ( Longmendong2Baogu2 osi) varied from the early leaning NNE tow ards SE to SN, and the strata dip w est ward, while the st rata far away from the block frontier w as stil in normal attitude. T he Jianjianshi anticline bent eastw ard in t he nort h boundary of the block, form ing the NW folds and faults, w hile the Emei mountain fault slipped in the sout h boundary of t he block. Since the Quaternary, t he int ensive intermitt ent uplift occurred for the Emei mountain, and the current topography w as formed due to more than 10 uplifting e2 vents. Since the Cenozoic, the horizontal dislocation betw een tw o strata of the Emei mountain fault is about 6 000 m, w hile the vert ical dislocat ion is 4 000 m.