Chronology of major geological events of the Wudang block in the south Qinling orogen
-
摘要: 武当地块是南秦岭构造带内一系列前寒武纪地块之一 ,古生代以来经历过 3次重要的构造变形 ,即伸展作用、逆冲推覆作用和造山晚期走滑构造作用。运用4 0 Ar/39Ar阶段升温、4 0 Ar/39Ar激光探针及Sm Nd等时线等多种测年方法确定伸展构造发生于 4 2 3~ 2 6 1Ma、逆冲推覆构造发生于 2 34~ 2 0 0Ma ,表明伸展构造可能分别与商丹缝合带的碰撞及勉略洋的拉开有关 ,称之为同碰撞伸展构造 ,而武当地块内发育的逆冲推覆构造则应是华北板块与扬子板块沿勉略带发生碰撞的结果。
-
关键词:
- 同位素年龄测定 /
- 40Ar/39Ar年龄 /
- Sm-Nd等时线年龄 /
- 构造变形 /
- 武当地块
Abstract: The Wudang block is one of several median blocks in a series of rigid orogenic belts in the South Qinling tectonic belt. It has undergone three major tectonic deformation events since the Paleozoic, i.e. syncollisional extention, thrusting and late orogenic strike slip. Structural study indicates that the deformational events are related to the collision of the North China plate and the South Qinling tectonic belt along the Shangdan suture zone, the opening of the late Paleozoic Mianlue Ocean and the wholesale collision of the North China plate with the Yangtze plate in the Qinling orogen, respectively. The syncollisional extension occurred 423~261 Ma ago and thrusting about 234~200 Ma ago.-
Keywords:
- isotopic age determination /
- 40 Ar/ 39 Ar age /
- Sm Nd isochron age /
- deformation /
- Wudang block
-
-
张二朋 .秦岭—大巴山及邻区地质图 (1:10 0万 ) [Z].北京 :地质出版社 ,1992 . 蔡学林 ,石绍清 ,吴德超 ,等 .武当山推覆构造的形成与演化 [M].成都 :成都科技出版社 ,1995 . 柴玉成 .东秦岭造山带南翼的构造格局及演化 [D].中国地质大学 (北京 )博士论文 ,1989. 胡健民 ,李侠 ,宋子新 ,等 .扬子地块北缘滑脱系统结构单位的组成与特征 [J].西安地质学院学报 ,1993,15 (增刊 ) :6 1. 胡健民 .南秦岭构造带武当地块构造演化 [D].中国地质大学 (北京 )博士论文 ,1998. 胡健民 ,宋子新 ,郭力宇 .湖北武当地块北缘伸展滑脱构造特征 [J].中国区域地质 ,1999,(1) :39- 44 . 秦正永 ,刘兴义 ,胡小蝶 ,等 .武当地区构造解析及成矿规律 [M].北京 :地质出版社 ,1996 . WANFUHUANG .Multiphasedeformationanddisplacementwithinabasementcomplexonacontinentalmargin :theWu dangComplexintheQinlingOrogen ,China[J].Tectonophysics ,1993,2 4:30 5 - 32 6 .
MATTAUERMPH ,MATTEJ ,MALAVIEILLET ,etal.TectonicsoftheQinlingBelt:build -upandevolutionofeasternAsia[J].Nature,1985 ,317(10 ) :496 - 5 0 0 .
赖绍聪 ,张国伟 ,杨永成 ,等 .南秦岭勉县—略阳结合带蛇绿岩与岛弧火山岩地球化学及其大地构造意义 [J].地球化学 ,1998,2 7(3) :2 83- 2 93. 宋鸿林 .秦岭—大别造山带早期的伸展构造 [A].见 :钱祥麟主编 .伸展构造研究 [C].北京 :地质出版社 ,1990 .12 . RATSCHBACHERL ,etal.LateralextrusionintheeasternAlps,Part 1:Boundaryconditionsandexperimentsscaledforgravity[J].Tectonics ,1991,10 (2 ) :2 45 - 2 5 6 .
计量
- 文章访问数: 726
- HTML全文浏览量: 1
- PDF下载量: 88
下载:
