Location of the Suture Zone between Yangtze and North China Blocks in Eastern Dabie Orogen
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摘要: 大别山为扬子陆块和华北陆块之间的碰撞造山带.构造-岩石单元的岩石组成、同位素年代学资料和构造关系表明, 大别山东段主要由扬子陆块北缘不同变质程度的变质基底和少量浅变质盖层组成, 没有代表蛇绿混杂岩和华北陆块南缘古生代活动大陆边缘的火山-侵入岩建造.各主要构造-岩石单元间的界线为超高压变质岩折返过程中形成的伸展型剪切带, 大别山北部的伸展-逆冲推覆构造也是超高压变质岩折返过程中伸展构造的一部分, 其中不存在具有缝合带意义的重要构造界线.因此, 在大别山东段, 华北陆块和扬子陆块间的缝合带既不是水吼-五河剪切带, 也不是磨子潭-晓天断裂.根据地球物理资料推测, 南北陆块间的缝合带应分布在信阳-舒城断裂的前缘, 但现在覆于合肥盆地中新生代沉积之下.Abstract: Dabie mountains are a collision orogen between the Yangtze and the North China blocks. The rock components, isotopic dating and tectonic relation of the tectonic-petrological units in the eastern Dabie orogen indicate that the Dabie orogen is composed mainly of the metamorphic basement suffered different-grade metamorphism and low-grade metamorphic cover of the north margin of the Yangtze block, without ophiolitic mélange and Paleozoic vocanic-intrusive rock association in the south margin of the North China block. The boundary between the tectonic-petrological units is extensional shear zone developed in the exhumation process of the ultra-high pressure metamorphic rocks, and the extensional-thrust and nappe structure in the northern part of the Dabie Mountains is also one part of the extensional structures in the exhumation process of the ultra-high pressure metamorphic rocks. There is no key tectonic boundary indicating the occurrence of the suture zone. Therefore, not the Shuihou-Wuhe shear zone, nor the Mozitan-Xiaotian fault are the suture zone between the Yangtze and the North China blocks. Combining the geophysical data, the Xinyang-Shucheng fault is the Indo-Chinese suture between the Yangtze and the North China blocks, but now is covered under the Mesozoic and Cenozoic deposits of the Hefei basin.
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Key words:
- eastern Dabie orogen /
- suture zone /
- North Huaiyang belt /
- Xinyang-Shucheng fault
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图 1 大别山东段构造地质图和剖面图
1.上白垩统—古近系; 2.下白垩统/中下侏罗统; 3.震旦系—三叠系; 4.早白垩世火山岩/花岗岩; 5.平移断层; 6.高角度正断层; 7.逆冲断层; 8.滑脱剪切带; 9.倒转的滑脱剪切带; 10.糜棱面理及片麻理; 11.线理及倒转线理倾向; Ⅰ.南大别构造岩片带: Ⅰ1.超高压变质岩; Ⅰ2s/Ⅰ2h.宿松变质杂岩/红安—浒湾高压变质岩; Ⅰ3.张八岭群; Ⅱ.中大别穹隆构造带; Ⅲ.北大别隆滑-逆冲构造带: Ⅲ1.卢镇关杂岩; Ⅲ2.佛子岭群; Ⅲ3.石炭系; TLF.郯庐断裂; SMF.商麻断裂; XGF.襄樊-广济断裂; TSS.太湖-上巴河剪切带; SYS.水吼-英山剪切带; MXF.磨子潭-晓天断裂金寨舒城断裂信阳舒城断裂的东段▼采样位置及编号
Fig. 1. Tectonic sketch map and profile of the eastern Dabie orogen
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