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地质科学  2001, Vol. Issue (1): 64-71    DOI:
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滇桂交界区印支期前陆褶皱冲断带
吴根耀
中国科学院地质与地球物理研究所 北京 100029
INDOSINIAN FORELAND FOLD-AND-THRUST BELT BORDERING YUNNAN AND GUANGXI, CHINA
Wu Genyao
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029
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摘要 最近发现的蛇绿岩指示中、越交界区发育一条古特提斯的地缝合线,分开了越北地块和华南次大陆。滇桂交界处的印支期前陆褶皱冲断带为古特提斯造山带提供了进一步的证据。本文讨论了冲断-推覆构造的特征,提出该地的古特提斯洋具复杂的大陆边缘,沿北西走向段先发生碰撞,之后沿北东东向段发生碰撞,北西向断裂则发生右行的走滑(或右行斜冲)活动。冲断作用是向北或北东扩展的,仰冲的增生杂岩可能掩埋了大部分磨拉石沉积,造成了磨拉石不发育的假象。
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吴根耀
关键词冲断-推覆构造   前陆褶皱冲断带   古特提斯造山带   滇桂交界区     
Abstract: Recent discoveries on ophiolites indicate that there must have been a Paleotethyan geosuture zone bordering China and Vietnam, which separated the Vietbac Block from the Huanan Subcontinent. The Indosinian foreland fold-and-thrust belt bordering Yunnan and Guangxi supported further evidence to the Paleotethysides. This paper aims at to discuss the main features of thrust-nappe structures, and reveal some characteristics of Indosinides in the area which was reformed in the Himalayan orogenesis. The continental margin of Paleotethyan ocean there may have been a complicated one. The passive continental margin might be NEE-striking in southeast Yunnan, with some NW-striking troughs (or aulacogens) stretching into the carbonate platform; while in west Guangxi the passive one NW-stretching. In southeast Yunnan, the face to face continental collision occurred along the NEE-striking segment, and the thrusts constituted a leading imbricate fan; and dextral strike-slipping along the NW-striking faults. Two kinds of front can be distinguished: a broad and low-strained front and passive roof duplex, the latter being related to dextral strike-slipping of Wenshan Malipo fault. The manifestation of NW-striking thrusts in west Guangxi was dextrally oblique thrusting in Indosinian orogenesis. In addition to thrusts, the nappe structures well occurred in the area. The distant allochthonous rocks are composed of limestones of oceanic island, floating on the Triassic turbidites, and some of them have been involved into the foreland thrusting. The sedimento-igneous rocks deposited on passive continental margin in nappe outlier may represent a short-distance allochthon, for example, the Funing nappe-outlier. The thrusting was extended towards the north or northeast, and the overthrust accretional complex might bury most of the molasse deposits and create a false impression of few molasse occurring.
Key wordsThrust-nappe structures   Foreland fold and thrust belt   Paleotethysides   Area bordering Yunnan and Guangxi   
收稿日期: 1999-12-14;
引用本文:   
吴根耀. 2001, 滇桂交界区印支期前陆褶皱冲断带. 地质科学, (1): 64-71.
Wu Genyao. INDOSINIAN FORELAND FOLD-AND-THRUST BELT BORDERING YUNNAN AND GUANGXI, CHINA[J]. Chinese Journal of Geology, 2001, (1): 64-71.
 
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[1] 李曰俊, 吴根耀, 雷刚林, 张敬洲, 王月然, 刘亚雷. 新疆库车新生代前陆褶皱冲断带的变形特征、时代和机制[J]. 地质科学, 2008, (3): 488-506.
[2] 苗继军, 贾承造, 侯向辉, 王招明, 邹才能, 汤良杰, 宋玉斌. 塔里木盆地西部喀什地区新生代褶皱冲断带构造解析[J]. 地质科学, 2007, (4): 740-752.
[3] 伍秀芳, 刘胜, 汪新, 杨树锋, 顾雪梅. 帕米尔—西昆仑北麓新生代前陆褶皱冲断带构造剖面分析[J]. 地质科学, 2004, (2): 260-271.
[4] 汤良杰, 贾承造, 金之钧, 皮学军, 陈书平, 谢会文. 库车前陆褶皱冲断带中段第三系盐枕构造[J]. 地质科学, 2003, (3): 281-290.
[5] 何建坤, 卢华复, 朱斌. 东秦岭造山带南缘北大巴山构造反转及其动力学[J]. 地质科学, 1999, (2): 139-153.
[6] 肖文交, 李继亮, 何海清. 从前陆褶皱冲断带看大地构造相分析及其意义[J]. 地质科学, 1997, (1): 27-36.
 
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