MAJOR CONSTITUENTS AND TEXTURE OF THE TONGBAI-DABIE COLLISIONAL OROGENIC BELT
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摘要: 桐柏-大别碰撞造山带的组成与结构, 主要是印支期碰撞及高压、超高压变质期后伸展构造和中新生代热-构造演化的结果.在组成上, 除了燕山期及其后的岩浆活动和盆地堆积产物以外, 主要包括核部杂岩单元、超高压单元、高压单元、绿帘-蓝片岩单元和沉积盖层单元等, 此外还有一些镁铁质和超镁铁质岩体残留或侵入其中.桐柏-大别碰撞造山带的整体结构样式类似于北美西部的变质核杂岩带, 即以总体具穹隆形态及多层拆离滑脱带的发育为特征, 构成了以罗田和桐柏山为核部的两个穹隆.超高压单元、高压单元和绿帘蓝片岩单元作为不同的岩片夹持于核部杂岩和沉积盖层之间, 其分布格局受碰撞期后伸展构造格架所制约.Abstract: The present constitution and architecture of the Tongbai-Dabie orogenic belt is the combined result of the Triassic subduction collision, the extension tectonics postdating the HP-and UHP metamorphism, and thermo-tectonic evolutions in the Mesozoic-Cenozoic time. In addition to Yanshanian and post-Yanshanian magmatic intrusions, volcanics, and basin deposits, the lithotectonic constituents of the Dabie orogenic belt mainly consist of a core complex (CC) unit, a UHP unit, a HP unit, an epidote blueschist (EBS) unit and a sedimentary cover (SC) unit. Minor mafic-ultramafic plutons or massifs were intruded into or preserved within them. The rock slices of UHP, HP, and EBS units are progressively sandwiched between the underlying core complex and the overlying sedimentary cover. The distribution of lithotectonic units is controlled by an extensional tectonic framework postdated the collisional event. The tectonic pattern of the Tongbai-Dabie orogenic belt as a whole is similar to that of the metamorphic core complex described from the western North America, which is characterized by a general doming morphology with the development of multi-layered detachment zones.
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Key words:
- collisional orogenic /
- constituent /
- texture /
- Tongbai-Dabie
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图 1 桐柏-大别山三叠纪碰撞期后构造简图
1.边界断裂; 2.构造缝合带; 3.下伸展滑脱带; 4.中伸展滑脱带; 5.上伸展滑脱带; 6.顶伸展滑脱带.QHF.确山-合肥断裂; XFF.信阳-肥西断裂; JMF.军马河-马蹄湾断裂; GMF.龟山-梅山断裂; BMXF.八里畈-晓天-磨子潭断裂; XGF.襄樊-广济断裂; TLF.郯城-庐江断裂; CC.核部杂岩单元; UHP.超高压单元; HP.高压单元; EB.绿帘蓝片岩单元; SC.沉积盖层.
图 2 湖北麻城木子店地区地质图
1.黑云斜长片麻岩; 2.石榴夕线石片麻岩; 3.角闪石榴二辉岩; 4.斜长角闪岩; 5.磁铁石英岩; 6.中酸性麻粒岩; 7.剪切带; 8.面理化二长花岗岩; 9.面理; 10.线理
图 3 超高压(UHP) 单元和核部杂岩(CC) 单元中片麻岩及面理化花岗岩的w (An)-w (Ab)-w (Or) 及w (K2O)-w (Na2O)-w (CaO) 图解
Fig. 3. Diagrams of w (An)-w (Ab)-w (Or) and w (K2O)-w (Na2O)-w (CaO) of gneiss and foliated granites in ultra-high-pressure and core complex units
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