大湄公河次地区主要结合带的对比与连接  

Correlation and connection of the main suture zones in the Greater Mekong subregion

作　　者：李兴振[1] 刘朝基[1] 丁俊[1] 

机构地区：[1]成都地质矿产研究所,四川成都610082

出　　处：《沉积与特提斯地质》2004年第4期1-12,共12页Sedimentary Geology and Tethyan Geology

摘　　要：大湄公河次地区有多条结合带。根据它们及相关构造单元的时空演化和配置关系,对其南北延伸和连接提出了一些新的意见:(1)印缅山脉结合带向北延与葡萄 密支那结合带汇合后,西接雅鲁藏布江结合带;(2)葡萄 密支那结合带西接雅鲁藏布江结合带,向南西被实皆右行断裂错断,其错断部分为西缅中央火山弧带北段的夏杜苏 隆东带,其南段可能潜没在古近纪沉积层之下;(3)班公湖 怒江结合带南延接潞西 抹谷结合带,再南可能潜伏在墨吉群和抹谷群推覆体之下;(4)昌宁 孟连结合带南延接清迈结合带,并在南奔一带与澜沧江结合带相交汇,原先的昌宁 孟连 清迈洋可能与西藏地区的马利 同卡裂谷盆地和双湖 冈玛错小洋盆构成一个类似现今日本海、东海海槽和南海那样呈串珠状分布的盆地带;(5)澜沧江结合带主体为一隐伏在东达山 临沧 景栋花岗岩带推覆体之下的隐伏结合带,向南接清莱—湄他一带的隐伏结合带和马来半岛的文冬 劳勿结合带,向北在西金乌兰湖一带与可可西里 金沙江结合带相交汇,可可西里 澜沧江 文冬 劳勿结合带构成晚古生代冈瓦纲大陆和劳亚大陆的分界;(6)难河 程逸结合带向北延至思茅西边小黑江一带,可能终止在小黑江以北地区,向南接沙缴和贡布 何仙结合带;(7)哀牢山 斯雷博河结合带是新厘定的结合带,从哀牢山向南经南?There are many suture zones in the Greater Mekong subregion. Some views about the N-S extension and connection of these suture zones have been proposed as follows on the basis of the spatio-temporal evolution and arrangement of the suture zones and other tectonic units. (1) The Indo-Burma Ranges suture zone extends northwards connecting with the Putao-Myitkyina suture zone, and then westwards connecting with the Yarlung Zangbo suture zone. (2) The Putao-Myitkyina suture zone is cut off at its southwestern end by the Sagaing dextral fault and the faulted part of the suture zone should be the Xiadusu-Nongdong zone within the northern section of the Inner-Burman central volcanic arc belt. Towards the south, the suture zone may be covered by the Paleogene and Neogene sediments. (3) The Bangong Lake-Nujiang suture zone extends southwards connecting with the Luxi-Mogok suture zone, and towards further south it may hide beneath the nappes of Mergui and Mogok Groups. (4) The Changning-Menglian suture zone extends southwards connecting the Chiang Mai (suture) zone, and then conjugating the Lancangjiang suture zone. The pre-existing Changning-Menglian-(Chiang Mai) Ocean together with Mali-Tanggar rift basin and Shuanghu-Gangmarco oceanic basin in Xizang may be aligned like a paternoster, as in the case of the present-day Sea of Japan, East China Sea Trough and South China Sea. (5) The main part of the Lancangjiang suture zone is a concealed suture zone beneath the nappes within the Dongdashan-Lincang-Kengtong granite belt. Towards the south, it connects with the Chiang Rai-Mae Tha concealed suture zone in Thailand and Bentong-Raub suture zone in the Malay Peninsula, and towards the north, it connects with the Hoh Xil-Jinshajiang suture zone in the Xijir Ulan Lake area. The Hoh Xil-Lancangjiang-Bentong-Raub suture zone is interpreted as the boundary between Gondwana and Laurasia during the Late Palaeozoic. (6) The Nan River-Uttaradit suture zone extends northwards to the Xiaohe River west of Simao, Yunnan, and then ends in

关 键 词：大湄公河次地区 结合带 特提斯构造域 

分 类 号：P542[天文地球—构造地质学]