EVOLUTION OF THE CENTRAL CATALAN MARGIN OF THE VALENCIA TROUGH (WESTERN MEDITERRANEAN)
EVOLUTION OF THE CENTRAL CATALAN MARGIN OF THE VALENCIA TROUGH (WESTERN MEDITERRANEAN)
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DOI：
10.1016/0040-1951(92)90225-u
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发表时间：
1992-03-15
期刊：
影响因子：
2.9
通讯作者：
ROCA, E
中科院分区：
文献类型：
--
作者：
BARTRINA, MT;CABRERA, L;ROCA, E
加泰罗尼亚中央边缘的演变是由主要的断层活动和地壳减薄产生的热过程的条件。 大陆边缘构造的特征是主要的NE-SW走向，东南倾的基底断裂，产生地堑，半地堑和地垒系统。 这些断层基本上是正断层。 没有重大的新近纪走滑活动影响大陆边缘，虽然小的幕式变化，从占主导地位的伸展体制走滑构造不能被忽视。 盆地边缘经历了两个主要的构造演化阶段，并逐渐过渡到另一个阶段：（1）裂谷阶段（晚渐新世？ 与瓦伦西亚海槽的开启有关，巴塞罗那和瓦勒斯-佩内德斯半地堑都起源于此;（2）热沉降阶段（布尔迪加里晚期至今），由随后的地壳冷却和减薄产生。 断裂活动主要集中在主要的半地堑边界断裂上，加泰罗尼亚边缘中段的沉积演化受构造和地壳演化以及影响该地区的海平面和古气候变化的控制。 在裂谷期向热沉降期过渡的过程中，沉积体系发生了剧烈的变化。 在Aquitanian-Langhian时期，其特征是海洋条件脉动侵蚀大陆边缘的总体趋势，沉积体系（冲积、湖相、海岸沉积、扇三角洲-海湾-陆架、碳酸盐台地体系）的显著多样性得到发展。 从最晚的Serravallian到现在，由于海平面的普遍降低和大多数古老的构造高点的最终重叠，沉积框架变化较小，这些构造高点现在被埋在中新世沉积物下面。 两个跨大陆的陆源陆棚-岩屑堆积体系发育于Serravallian-Tortonian晚期和上新世-第四纪。
The evolution of the central Catalan margin was conditioned by major fault activity and thermal processes generated by crustal thinning. The continental margin structure is characterised by major NE-SW-striking, southeast-dipping basement faults which have given rise to a graben, half-graben and horst system. These faults acted essentially as normal faults. No major Neogene strike-slip activity has affected the continental margin, although minor episodic variations from the dominant extensional regime to strike-slip tectonics cannot be discounted. Two major structural evolutionary stages took place at the margin, the transition from one stage to the other being gradual: (1) rifting stage (Late Oligocene? to early Burdigalian) related to the opening of the Valencia trough and from which originated both the Barcelona and Valles-Penedes half-grabens; (2) thermal subsidence stage (late Burdigalian to present) generated by the subsequent crustal cooling and thinning. Fault activity during this stage was essentially concentrated in the major half-graben bounding faults.The sedimentary evolution of the central sector of the Catalan margin was controlled by the tectonic and crustal evolution as well as by the successive sea-level and paleoclimatic changes which affected the region. Drastic changes in the depositional systems took place during the transition from the rifting stage into the thermal subsidence stage. During Aquitanian-Langhian time-characterized by an overall trend of pulsating encroachment of marine conditions over the continental margin-a noticeable diversity of depositional systems (alluvial, lacustrine, coastal evaporitic, fan delta-bay-shelf, carbonate platform systems) developed. From the latest Serravallian up to the present, the depositional framework was less varied due to a general lowering of sea-level and to the final onlapping of most of older structural highs, which are now buried below the Miocene sediments. Two progradational terrigenous shelf-talus systems separated by the Messinian erosive surface developed during the latest Serravallian-Tortonian and Pliocene-Quaternary.