CHARACTERISTICS OF IMPORTANT FAULTS AND DIVISION OF TECTONIC UNITS IN THE WEST OF SANJIANG OROGENIC BELTS, YUNNAN PROVINCE
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摘要:
经资料搜集与野外调研，对云南三江造山带西部重要断裂的位置、特征及南北连接，形成了一些新的认识.即：①怒江断裂在滇西北为高黎贡山变质基底杂岩与丙中洛地块、滇西南为潞西断块与保山地块的边界断裂，属三级构造单元的边界断裂；②班公错-东巧断裂进入云南后，北段、中段与位于高黎贡山主峰的向东倾斜的高黎贡山逆冲推覆断裂相连接，南段称为龙陵-瑞丽断裂；③高黎贡山断裂、龙陵-瑞丽断裂为腾冲造山带与三江造山带的边界断裂，属一级构造单元的边界断裂；④昌宁-孟连结合带东西两侧的双江-竹塘断裂、沧源断裂北延至滇西北后，分别与位于碧罗雪山西坡的福贡断裂、捧当断裂相连接；⑤迪麻洛-昌宁-孟连结合带为二级构造单元，东西两侧的二级构造单元分别为崇山-临沧地块、丙中洛-保山陆块.云南三江造山带西部划分为2个二级构造单元、7个三级构造单元.
Abstract:Through data collection and field investigation, some new knowledge is gained on the location, characteristics and north-south connection of important faults in the west of Sanjiang orogenic belts, Yunnan Province, as described below. 1) Nujiang fault is a third-order tectonic unit boundary fault between Gaoligong Mountain metamorphic basement complex and Bingzhongluo block in northwestern Yunnan, as well as between Luxi fault block and Baoshan block in southwestern Yunnan. 2) As Bangongcuo-Dongqiao fault extends to Yunnan, the north and middle sections are connected with the east-inclined thrust nappe fault located on the main peak of Gaoligong Mountains, and the southern section is known as Longling-Ruili fault. 3) Gaoligongshan fault and Longling-Ruili fault are the boundary structures of first-order tectonic unit between Tengchong orogenic belt and Sanjiang orogenic belt. 4) The Shuangjiang-Zhutang fault and Cangyuan fault on the east and west sides of Changning-Menglian junction zone extend northward to northwestern Yunnan and are connected with Fugong fault and Bangdang fault respectively on the west slope of Biluo Snow Mountain. 5) The Dimaluo-Changning-Menglian junction zone is a second-order tectonic unit, bordered by the second-order tectonic units of Chongshan-Lincang block on the east and Bingzhongluo-Baoshan block on the west respectively. The western Sanjiang orogenic belts are divided into 2 second-order and 7 third-order tectonic units.
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Key words:
- Sanjiang orogenic belts /
- important fault /
- tectonic unit /
- Yunnan Province
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表 1 云南三江造山带西部大地构造单元划分
Table 1. Division of tectonic units in the west of Sanjiang orogenic belts, Yunnan Province
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