大地构造与成矿学
大地構造與成礦學
대지구조여성광학
GETECTONICA ET METALLOGENIA
2015年
2期
231-240
,共10页
王凯%刘少峰%姜承鑫%王平%张岩%孟勇
王凱%劉少峰%薑承鑫%王平%張巖%孟勇
왕개%류소봉%강승흠%왕평%장암%맹용
叠加褶皱%扬子板块北缘%前陆褶皱逆冲带
疊加褶皺%颺子闆塊北緣%前陸褶皺逆遲帶
첩가습추%양자판괴북연%전륙습추역충대
superposed fold%northern Yangtze Block%foreland fold thrust belt
扬子板块北缘在中生代期间经历多期构造变形,早期形成的构造样式多被后期的构造变形改造破坏,仅在大巴山弧形断裂和大洪山弧形带之间的南漳一带较好地保存了早期的构造变形样式。笔者通过对当阳复向斜北段发育的褶皱构造的构造要素测量统计和褶皱叠加关系的解析,在扬子板块北缘中段南漳一带识别出三期走向不同的褶皱叠加构造,按发育早晚顺序分别为 NW-SE 走向褶皱、NE-SW 走向褶皱和近 EW 走向褶皱,分别对应扬子板块向北俯冲以及后期转入陆内变形、江南–雪峰褶皱逆冲带向NW逆冲推覆和晚侏罗世到早白垩世期间大巴山向SW推进等构造变形过程。
颺子闆塊北緣在中生代期間經歷多期構造變形,早期形成的構造樣式多被後期的構造變形改造破壞,僅在大巴山弧形斷裂和大洪山弧形帶之間的南漳一帶較好地保存瞭早期的構造變形樣式。筆者通過對噹暘複嚮斜北段髮育的褶皺構造的構造要素測量統計和褶皺疊加關繫的解析,在颺子闆塊北緣中段南漳一帶識彆齣三期走嚮不同的褶皺疊加構造,按髮育早晚順序分彆為 NW-SE 走嚮褶皺、NE-SW 走嚮褶皺和近 EW 走嚮褶皺,分彆對應颺子闆塊嚮北俯遲以及後期轉入陸內變形、江南–雪峰褶皺逆遲帶嚮NW逆遲推覆和晚侏囉世到早白堊世期間大巴山嚮SW推進等構造變形過程。
양자판괴북연재중생대기간경력다기구조변형,조기형성적구조양식다피후기적구조변형개조파배,부재대파산호형단렬화대홍산호형대지간적남장일대교호지보존료조기적구조변형양식。필자통과대당양복향사북단발육적습추구조적구조요소측량통계화습추첩가관계적해석,재양자판괴북연중단남장일대식별출삼기주향불동적습추첩가구조,안발육조만순서분별위 NW-SE 주향습추、NE-SW 주향습추화근 EW 주향습추,분별대응양자판괴향북부충이급후기전입륙내변형、강남–설봉습추역충대향NW역충추복화만주라세도조백성세기간대파산향SW추진등구조변형과정。
The northern Yangtze Block went through many periods of deformation, within which the early-period structural styles were destroyed and replaced by later ones. Fortunately, records of the early-period deformation styles are reserved in the Nanzhang area, which is tectonically located between the two arc-shaped fault-belts in the northern Yangtze Block:Daba Shan and Dahong Shan. Three phases of folding were recognized in the Dayang synclinorium area, namely the first stage NW-SE trending folds, second stage NE-SW trending folds, and the third stage E-W trending folds. The three phases of folding correspond to the tectonic deformations such as the northward subduction of the Yangtze Block with later intra-continental deformation, the northwest-ward thrusts of the Jiangnan-Xuefeng fold blets and the southwest-ward propagation of Daba Shan fault belts during the late Jurassic to early Cretaceous, respectively.