Deformation of Chuxiong Foreland Basin
-
摘要: 云南省的楚雄盆地位于扬子板块西南缘,是古特提斯的金沙江—墨江洋在中三叠世碰撞关闭后,在哀牢山—红河碰撞造山带东北侧形成的中生代前陆盆地。盆地曾先后经历了2期不同性质构造作用的改造变形。第Ⅰ期发生于晚白垩世—始新世,是以哀牢山—红河碰撞造山带的隆升,并由南向北,向楚雄前陆盆地逆冲推覆作用为主,形成变形强度逐渐衰减的递进逆冲—褶皱变形带,以及伴随在推覆体旁侧的左行平移走滑断裂作用的改造;第Ⅱ期为渐新世末—中新世时期,随着印度板块与欧亚板块碰撞后的楔入与持续榨挤,楚雄盆地由近E-W的轴向被推挤为NW走向,并同时发生了右行平移和简单剪切为主的断裂作用改造,以及由南西向北东方向持续的逆冲—褶皱变形。Abstract: Locating in the southwestern margin of the Yangtze Plate,the Chuxiong Basin in Yunnan Province is a Mesozoic foreland basin formed in the northeast of the Ailaoshan-Honghe Collisional Orogenic Belt after the closing of the Jinshajiang-Mojiang Oceans of Paleo-Tethys during the Middle Triassic.The basin has experienced 2 stages of tectonic deformations.In stage Ⅰ,from the Late Cretaceous to Eocene,the Ailaoshan-Honghe Collisional Orogenic Belt uplifted and thrusted from south to north to the Chuxiong Foreland Basin,resulting in progressive inversion and fold deformation belt with decreasing deformation strength as well as sinistral strike-slip fault by the side of nappe.In stage Ⅱ,from the end of Oligocene to Miocene,as the Indian Plate collided with the Eurasian Plate and kept wedging and squeezing,the axial of the Chuxiong Basin changed from EW to NW;meanwhile,fracture deformations such as right-lateral movement and simple shear took place,and the thrust-fold deformation from SW to NE happened.
-
Key words:
- deformation /
- thrust fold /
- lateral strike-slip /
- Chuxiong Basin
-
[1] 刘本培,冯庆来,方金乔.滇西南昌宁—孟连带和澜沧江古特提斯多岛洋的构造演化[J].地球科学——中国地质大学学报,1993,18(5):529-539. [2] 吴根耀.藏东左贡地区碧土蛇绿岩:古特提斯主洋盆的地质记录[J].科学通报,2006,25(6):685-693. [3] 钟大赉,吴根耀,翟国明,等.滇川西部古特提斯造山带[M].北京:科学出版社,1998. [4] 吕伯西,王增,张能德,等.三江地区花岗岩类及其成矿专属性[M].北京:地质出版社,1993. [5] 云南省地质矿产局.云南省区域地质志[M].北京:地质出版社,1995:352-447. [6] 蔡立国.楚雄盆地形成、构造形变及叠加改造关系研究[R].北京:中国科学院地质研究所,1998. [7] 沈上越,魏荣,程惠兰,等."三江"哀牢山带蛇绿岩特征研究[J].岩石矿物学杂志,1998,17(1):1-8. [8] 程裕淇.中国区域地质概论[M].北京:地质出版社,1994:165-384. [9] 刘福田,刘建华,何建坤,等.滇西古特提斯造山带下扬子地块的俯冲板片[J].科学通报,2000,45(1):79-83. [10] 谭富文,尹福光,许效松,等.楚雄前陆盆地系统的构造单元及沉积标识[J].沉积学报,2000,18(4):573-579. [11] 李秀梅.楚雄盆地烃源岩有机地化特征及综合评价[J].云南地质,2000,19(4):416-422. [12] 何登发,雷振宇,金维竣,等.楚雄盆地构造特征与油气保存单元研究[R].昆明:南方海相油气勘探项目经理部,2001. [13] 夏维书,李云杰,苟汉成,等.楚雄盆地西舍路至碧城镇区域地质综合大剖面研究报告[R].昆明:滇黔桂油田分公司勘探开发研究院,2001. [14] 刘池阳,王震亮,任战利,等.楚雄盆地原盆恢复及油气动态、成藏条件研究[R].西安:西北大学含油气盆地研究所,2003. [15] 汤良杰,金之钧,李儒峰,等.楚雄盆地波动过程及其对油气形成与分布的控制作用[R].北京:中国石油大学盆地与油藏研究中心,2002. -
计量
- 文章访问数: 1949
- HTML全文浏览量: 78
- PDF下载量: 1499
- 被引次数: 0
下载:
苏公网安备32021102000780号