CAJ | 학술논문

前人对雪峰造山带构造变形的认识尚存在较多分歧。本文通过构造剖面测制并结合区域地质调查，对雪峰造山带南段的不整合特征、形变类型、变形时代和强度、剖面结构以及构造变形的运动学特征、成因机制、构造体制等进行了较全面的分析研究，取得主要进展如下：(1)雪峰造山带南段形变类型主要有板劈理、膝折及折劈理、褶皱及与褶皱同走向的逆断裂、正断裂、左行和右行走滑断裂等；(2)广西运动和早中生代构造运动(印支运动与早燕山运动)中均存在明显的挤压变形，在NW-NWW向挤压下形成NE-NNE向褶皱和逆断裂；广西运动还形成了板劈理；(3)雪峰造山带南段以溆浦-靖州断裂为界分为东带和西带，分别为加里东期雪峰逆冲推覆构造的根带和中带，广西运动中东带变形强度显著大于西带，表现在东带板劈理发育且褶皱相对紧闭，而西带板劈理不发育且褶皱相对开阔，岩层倾角、不整合特征、抬升幅度、先期构造线偏转等表明早中生代构造运动中东带变形较强，而西带变形微弱；(4)劈理优势倾向以及褶皱轴面和逆断裂的倾向，反映雪峰造山带东带广西运动和早中生代构造运动中均具有背冲构造样式，但后者背冲构造的中轴相对前者显著向西迁移约20 km；(5)溆浦-靖州断裂以东在广西运动中成为雪峰推覆构造的根带，主要与其块体强度低及南华纪早期为一断陷深槽有关。
전인대설봉조산대구조변형적인식상존재교다분기。본문통과구조부면측제병결합구역지질조사，대설봉조산대남단적불정합특정、형변류형、변형시대화강도、부면결구이급구조변형적운동학특정、성인궤제、구조체제등진행료교전면적분석연구，취득주요진전여하：(1)설봉조산대남단형변류형주요유판벽리、슬절급절벽리、습추급여습추동주향적역단렬、정단렬、좌행화우행주활단렬등；(2)엄서운동화조중생대구조운동(인지운동여조연산운동)중균존재명현적제압변형，재NW-NWW향제압하형성NE-NNE향습추화역단렬；엄서운동환형성료판벽리；(3)설봉조산대남단이서포-정주단렬위계분위동대화서대，분별위가리동기설봉역충추복구조적근대화중대，엄서운동중동대변형강도현저대우서대，표현재동대판벽리발육차습추상대긴폐，이서대판벽리불발육차습추상대개활，암층경각、불정합특정、태승폭도、선기구조선편전등표명조중생대구조운동중동대변형교강，이서대변형미약；(4)벽리우세경향이급습추축면화역단렬적경향，반영설봉조산대동대엄서운동화조중생대구조운동중균구유배충구조양식，단후자배충구조적중축상대전자현저향서천이약20 km；(5)서포-정주단렬이동재엄서운동중성위설봉추복구조적근대，주요여기괴체강도저급남화기조기위일단함심조유관。
There exist different views about the deformation of the Xuefeng Orogenic Belt. The authors studied the uncomformity, deformation timing and strength, geometrical and kinematic properties, dynamic mechanisms and tectonic regimes in the southern Xuefeng Orogenic Belt through profile measurements and regional geological survey, and reached the conclusions as follows: (1) There occurred main deformation types such as slaty cleavages, folds, thrusts, normal faults, sinistral and dextral strike-slip faults. (2) There existed notable compressional deformations with NW to NWW compression and NE to NNE-trending folds and thrusts in both the Caledonian event and Early Mesozoic tectonic events (Indosinian event and Early Yanshanian event). Slaty cleavages were formed in the Caledonian event. (3) Southern segment of the Xuefeng Orogenic Belt can be divided into the east and west zones by the Xupu-Jingzhou Fault, and they were the root and middle zone of the Xuefeng thrust system respectively. The deformation in the east was stronger than that of the west zone in the Caledonian event, as shown by slaty cleavages and tight folds in the east zone, whereas the west zone lacks slaty cleavage and with more open folds. Differences of layer dip angles, uncomformity, uplift, and rotation of former lineaments indicated that there existed stronger deformation in the east than west zones in Early Mesozoic tectonic events. (4) Dip directions of slaty cleavages, fold axial surfaces and thrusts indicated that there existed back thrusts in both Caledonian event and Early Mesozoic tectonic events in the east zone of the Xuefeng Orogenic Belt, however, the axis of the back thrust in the Early Mesozoic shifted about 20 km westwards. (5) The eastern segment of the Xupu-Jingzhou Fault turned into the root of the Xuefeng thrust system, which was related to its lower strength and it was a deep fault during early Nanhuan.