广西运动在华南板块北缘的构造响应:来自生物地层学方面的证据
Tectonic Response of the Kwangsian Orogeny in the Northern Margin of the South China Block:Evidences from Biostratigraphy
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广西运动的构造作用范围是否涵盖华南板块北缘尚存在不同认识,并成为了制约相关构造动力学机制研究的瓶颈.此次研究聚焦北大巴山地区,以精确的笔石生物地层序列为标尺,同时综合岩石学特征认为,广西运动在华南板块北缘存在构造‒沉积响应,其构造启动时间为志留系特列奇阶Spirograptus turriculatus笔石带所代表的时限(~435 Ma),与“扬子上升”第一幕的时限基本一致.在华南板块北缘,广西运动在特列奇阶Oktavites spiralis-Cyrtograptus lapworthi笔石带所涵盖的时间范围内第一次到达构造活动峰值(~433 Ma),期间还伴随着大规模的岩浆活动.本研究进一步扩大了广西运动的构造作用范围,同时也为相关的构造发生模式和动力学机制研究提供了更多的思路和参考,即华南与华北碰撞的远程效应可能是广西运动重要的构造驱动力之一.
广西运动 / 华南板块北缘 / 构造响应 / 地层学 / 志留纪 / 沉积学.
Kwangsian Orogeny / northern margin of the South China Block / tectonic response / stratigraphy / Silurian / sedimentology
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中国地质调查局项目(DD20243411;DD20240029;DD20230553;DD20230005;DD20230215)
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