CAJ | 학술논문

对马尼拉俯冲带中段高精度地形数据编辑后绘制成图,联合之前所获取的地震剖面数据,对俯冲带增生楔的精细构造地貌特征及发育模式进行了深入探讨.在增生楔下构造区发现了大量狭长的微型圈闭盆地,经过对其平面断裂特点与深部应力状态的分析,发现增生楔从俯冲前缘到脊顶区其构造特点的转变对应着微型圈闭盆地4个完整的发育阶段,即初期的加积断裂阶段、中期的圈闭成盆阶段、后期的挤压消亡阶段乃至最终的隆升推覆阶段,揭示出一种新型的俯冲带增生楔发育模式,并推断其本质是深部板片俯冲活动所产生的压应力在海底面的表现.
대마니랍부충대중단고정도지형수거편집후회제성도,연합지전소획취적지진부면수거,대부충대증생설적정세구조지모특정급발육모식진행료심입탐토.재증생설하구조구발현료대량협장적미형권폐분지,경과대기평면단렬특점여심부응력상태적분석,발현증생설종부충전연도척정구기구조특점적전변대응착미형권폐분지4개완정적발육계단,즉초기적가적단렬계단、중기적권폐성분계단、후기적제압소망계단내지최종적륭승추복계단,게시출일충신형적부충대증생설발육모식,병추단기본질시심부판편부충활동소산생적압응력재해저면적표현.
High-precision large-scale multi-beam topographic data was edited carefully and used to plot submarine geomorphic shadow graph finally. The fine tectonic features of accretionary wedges and developing patterns of the minisize trapped basins at middle part of Manila Subduction Zone were discussed deeply associating with a seismic profile crossing the study area collected before. Multiple long and narrow minisize trapped basins were identified in lower tectonic zone of accretionary wedge. After analyzing the planar break feature and its deep stress status, we proved that the change of tectonic features from lower tectonic zone to top of the wedge was corresponding to a complete developing process of the minisize trapped basin, that is, from accretion and break stage at start to trap and basin formation in middle stage, extrusion and extinction during late stage, and elevation and nappe stage at last. A new type of developing pattern for accretionary wedges was disclosed during the process and the essence of it was manifested to be the expression of compressive stress on sea floor which was produced by subduction activities of deep plate.