Characteristics of Zhangyuan Structure Belt in the Northern Margin of Jiangnan Orogen
Characteristics of Zhangyuan Structure Belt in the Northern Margin of Jiangnan Orogen
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发表时间：
2012
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通讯作者：
Hu Wencheng
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作者：
Hu Wencheng
张塬构造带是印支-燕山期逆冲-走滑脆性断裂强烈叠加的区域性超壳断裂带，以NW-SW向韧性构造变形为特征，夹有新元古代基性岩，经历了多次变形。其主要事件是晋宁期弧-陆（扬子地块）碰撞导致的地球内部层位相对薄弱部位的向南逆冲韧性变形。张塬构造带镁铁质岩，如枕状-块状镁铁质熔岩、辉长岩、闪长岩等，在空间上紧密共生，形成于大陆边缘洋盆缓慢扩张的脊状环境。它们具有原始洋壳基性岩石的特征，表明它们是皖南富川蛇绿岩带西延的一部分。张塬构造带及其两侧新元古代火山-沉积建造形成于与大陆边缘和板块有关的构造-沉积环境。南为裂陷海盆沉积体系，北为与陆缘火山弧有关的沉积体系。因此，张塬构造带具有深海-半深海沉积特征。张塬构造带连接东北部的富川蛇绿岩带和西南部的景德镇-宜丰深大断裂，构成了以富川蛇绿岩带为代表的新元古代早期江南北方陆缘洋盆俯冲-碰撞拼贴带的重要组成部分。
The Zhangyuan structure belt is a regional ultra-crust faulting belt intensely superimposed by Indosinian-Yanshanian thrust-strike slip brittle fault, characterized by NW-SW-trending ductile structural deformation mingled with Neoproterozoic mafic rocks.This structure belt experienced multiple deformations. The main event was the southward thrusting ductile deformation occurring in relatively weak position within internal layers of the Earth, which resulted from arc-continent (Yangtze Block) collision during Jinningian period. Mafic rocks in theZhangyuan structure belt, such as pillow-massive mafic lava, gabbro, diabase and etc.are associated closely in the space, and formed in a slowly spreading ridges environment of continental marginal ocean basin. They are characteristic of initial oceanic crust mafic rocks, suggesting that they are part of the western extension of ofFuchuanophiolite belt in southern Anhui province. The Zhangyuan structure belt and Neoproterozoicvolcano-sedimentation formation distributed on both sides of the belt formed in structure- sedimentary environment related to continental margin and tectonic plates. To the south was sedimentary system of rifting sea basin, and to the north was the sedimentary system related to the continental margin volcano arc. Therefore, the Zhangyuan structure belt is characteristic of abyssal-bathyal sedimentation. The Zhangyuan structure belt connects the Fuchuanophiolite belt in northeast and Jingdezhen-Yifeng deep-large fault in southwest, and constituted an important part of subduction- collision collaged belt of continental margin oceanic basinin the northern margin of Jiangnanorogenduring Early Neoproterozoic, which isrepresented by the Fuchuanophiolite belt.