Post-rift extensional tectonics at the edge of a carbonate platform: insights from the Middle Jurassic-Early Cretaceous Monte Giano stratigraphic record (central Apennines, Italy)

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2021-10-15 DOI:10.1344/geologicaacta2021.19.12
F. Capotorti, C. Muraro
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Abstract

A new interpretation of the Middle Jurassic-Early Cretaceous paleogeographic evolution of the NW sector of the Latium-Abruzzi carbonate platform facing the Umbria-Marche Basin is proposed, based on Monte Giano area (central Apennines, Italy). During Late Triassic-early Bajocian time, the area was characterized by shallow water sedimentation. Inner and marginal carbonate platform deposits are overlain by pelagic deposits (Posidonia level), early Bajocian p.p. in age. This unconformity testifying the sudden drowning of the Monte Giano area, while shallow water sedimentation persisted in the remaining sectors of the carbonate platform. The Posidonia level is paraconformably overlain by distal slope deposits of the Velino Gorge limestones Formation, Kimmeridgian p.p.-Tithonian p.p. in age. Therefore, a 12Ma gap is recorded as in the Umbria-Marche Basin pelagic carbonate platforms. An extensional Bajocian tectonic phase, possibly related to the Piemont-Ligurian Ocean opening coupled with rheologic differences at the basin/platform boundary, drastically changed the regional paleogeography causing the breakup and the drowning of the NW sector of the Latium-Abruzzi carbonate platform and the creation of a large flat-topped pelagic carbonate platform. The estimate offset of the early Bajocian fault is around 300-350m. The Velino Gorge limestones fm. pass laterally and vertically to the Upper Tithonian platform-margin reef complex of the Ellipsactinia limestones fm.; these units constitute a shallowing and coarsening upward sequence and levelled the paleobathymetric gradient created by the Bajocian extension. The progradation of the Latium-Abruzzi carbonate platform continued during Early Cretaceous time. These results have strong implications on the tectonic and paleogeographic evolution of the major domains of the central Apennines.
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碳酸盐岩平台边缘的裂谷后伸展构造:来自中侏罗世-早白垩世Monte Giano地层记录的见解(意大利亚平宁中部)
基于Monte Giano地区(意大利亚平宁山脉中部),提出了面向Umbria-Marche盆地的Latium-Abruzzi碳酸盐岩台地NW段中侏罗世-早白垩世古地理演化的新解释。晚三叠世—早巴约修期,该区以浅水沉积为主。内、边缘碳酸盐岩台地沉积上覆有早巴约修期的上层沉积(波西多尼亚水平)。这种不整合证明了Monte Giano地区的突然淹没,而碳酸盐岩台地的其余部分则持续存在浅水沉积。波西多尼亚水平上覆有基默里吉纪-梯东纪的Velino峡谷灰岩组远端斜坡沉积。因此,在Umbria-Marche盆地中上层碳酸盐岩台地中记录了12Ma的缺口。一个伸展的巴约期构造阶段,可能与皮埃山-利古里亚海洋张开有关,加上盆地/台地边界的流变学差异,极大地改变了区域古地理,导致Latium-Abruzzi碳酸盐岩台地的NW段破裂和淹没,形成了一个大型平顶的上层碳酸盐岩台地。巴约谦早期断层的估计偏移量在300-350米左右。维利诺峡谷的石灰岩。横向和纵向通至上梯统台缘礁杂岩的椭圆岩系灰岩;这些单元构成了一个浅化、粗化的向上层序,平整了巴约西亚伸展所形成的古水深梯度。早白垩世,Latium-Abruzzi碳酸盐岩台地继续沉积。这些结果对亚平宁山脉中部主要构造域的构造和古地理演化具有重要意义。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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