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首页> 外文会议>NATO Advanced Research Workshop on the Adria Microplate: GPS Geodesy, Tectonics and Hazards >RATES OF LATE NEOGENE DEFORMATION ALONG THE SOUTHWESTERN MARGIN OF ADRIA, SOUTHERN APENNINES OROGEN, ITALY
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RATES OF LATE NEOGENE DEFORMATION ALONG THE SOUTHWESTERN MARGIN OF ADRIA, SOUTHERN APENNINES OROGEN, ITALY

机译：沿着阿德里亚西南部边缘，南部亚平宁山脉奥根宫，意大利南部山脊的晚期缘变形率

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During latest Miocene to Early Pleistocene deformation of the southwestern margin of Adria, the frontal thrust of the Southern Apennines orogen migrated toward the foreland rapidly (~16 mm/yr) and was accompanied by subsidence with the frontal thrust belt ami foredeep remaining at or below sea level. In contrast, the orogenic hinterland experienced extension, which was accompanied by uplift at ~0.3 mm/yr along the eastern transition to the contractional belt but net subsidence and formation of the Tyrrhenian basin farther west. Through time, the extensional belt progressively widened toward the northeast at the same rate as the encroachment of the thrust front on the Adriatic foreland. Following a mid-Pleistocene reduction in horizontal displacement rate associated with impingement of the thrust belt on thick crust of the Adriatic interior, the frontal thrust belt and foreland experienced uplift at -0.5 mm/yr as contraction stepped to deeper structural levels. Uplift of the eastern margin of the extensional hinterland continued at ~0.3 mm/yr and is followed by tectonic subsidence along the Tyrrhenian coast of southern Italy. Today, the pattern of mid-Pleistocene displacements continues, as suggested by seismicity and GPS velocities.The similarity in migration rates of contractional and extensional fronts across southern Italy over the last 6 million years supports models of crustal delamination and rollback of the subducted Adriatic slab as a fundamental driving mechanism for deformation along the western margin of Adria. Temporal variations in the vertical and horizontal rates of deformation, however, probably reflect differences in crustal structure and are not directly related to lithospheric processes. The reduction in the horizontal displacement rate associated with the onset of rapid foreland and frontal thrust belt uplift during the Early Pleistocene corresponds to a change from thin- to thick-skinned contraction initiated with the involvement of thick continental crust in regional shortening. Thin continental crust promoted thin-skinned contraction accompanied by subsidence, whereas thicker continental crust resulted in thick-skinned shortening and uplift.
机译：在最新中新世阿德里亚西南缘的早更新世变形，南部亚平宁的前推力造山带朝向快速前陆迁移（〜16个毫米/年），并伴随着与所述前部推动带AMI沉降前渊剩余在等于或低于海平面。与此相反，造山腹地经验的扩展，将其在-0.3毫米/年沿东过渡到contractional腰带，但净沉降和形成伊特鲁里亚盆地向西伴有隆起。通过时间，伸展带逐渐朝向东北以相同的速率作为推力正面上亚德里亚前沿的侵占加宽。以下与在亚德里亚内部，前部推动带和前陆有经验的隆起在-0.5毫米/年为收缩台阶更深结构层次的厚底的推力带的冲击相关联的水平位移速率的中间更新世减少。伸展腹地的东部边缘隆起继续在-0.3毫米/年，随后是沿着意大利南部的伊特鲁里亚海岸构造沉降。如今，中更新世位移的模式继续下去，因为在过去的600万年中整个意大利南部contractional和外延方面的迁移速率建议的地震和GPS velocities.The相似俯冲亚得里亚海板的地壳分层和回滚的支持机型作为沿亚德里亚西缘变形的根本动力机制。在变形的垂直和水平率的时间变化，但是，可能反映在地壳结构的差异，而不是直接相关的岩石圈过程。在早更新世期间与快速前陆和额叶推力带隆起的发生相关联的水平位移速率的降低对应于从薄壁与厚大陆地壳区域缩短的参与发起皮厚收缩的变化。薄大陆地壳促进薄皮收缩伴随着沉降，而更厚的大陆地壳导致皮厚缩短和隆起。

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