Studying travertines for neotectonics investigations: Middle–Late Pleistocene syn-tectonic travertine deposition at Serre di Rapolano (Northern Apennines, Italy)
Studying travertines for neotectonics investigations: Middle–Late Pleistocene syn-tectonic travertine deposition at Serre di Rapolano (Northern Apennines, Italy)
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研究石灰华以进行新构造学研究：Serre di Rapolano（意大利北亚平宁山脉）中更新世中晚期同构造石灰华沉积
DOI：
10.1007/s00531-009-0456-y
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发表时间：
2010
影响因子：
2.3
通讯作者：
M. Voltaggio
中科院分区：
文献类型：
--
作者：
A. Brogi;E. Capezzuoli;R. Aqué;M. Branca;M. Voltaggio
通过对内亚平宁山脉北部腹地一片区域出露的钙华沉积的研究，推断出了中更新世晚期 - 晚更新世的构造活动。对构造与钙华沉积之间关系的详细研究，以及对位于塞尔雷迪拉波拉诺村（托斯卡纳南部，内亚平宁山脉北部）附近的卡瓦奥利维拉采石场钙华的²³⁰Th/²³⁴U年龄测定，使我们能够识别出更新世断层，其活动至少可追溯到157 - 24千年。钙华沉积受西西西南 - 东东北走向的斜向和正断层构造控制，这些断层与一条主断层（名为维奥兰特断层）有关。该构造切割了一条年龄为上新世早 - 中期的区域正断层（称为拉波拉诺断层），该断层界定了上新世锡耶纳盆地的东侧，并为黏土和砂质海洋沉积物提供了空间容纳场所。由于断层 - 断层交汇处的破坏增强作用，有利于热液循环（以及相关的钙华沉积）。钙华所记录的变形也证明了构造活动，这表明在64 ± 5到40 ± 5千年之间发生了一次主要的构造事件。研究区域所描述的构造活动与周边地区（例如阿米阿塔山和乌尔西尼山）以及亚平宁山脉中部第勒尼安海边缘所记录的第四纪构造演化一致，表明直到第四纪晚期，广泛的构造活动影响了亚平宁山脉内部。
Middle–Late Pleistocene tectonic activity has been inferred through studies on travertine deposits exposed in a tract of the hinterland Northern Apennines. A detailed study on the relationships between tectonics and travertine deposition coupled with 230Th/234U age determination of travertines at Cava Oliviera quarry, located close to Serre di Rapolano village (southern Tuscany, Northern Apennines), allowed us to recognise Pleistocene faults, whose activity has been referred to 157–24 ka, at least. Travertine deposition was tectonically controlled by WSW-ENE striking, oblique and normal faults, associated to a main fault (named as the Violante Fault). This structure dissected a regional normal fault (known as the Rapolano Fault) Early–Middle Pliocene in age, which bounded the eastern side of the Pliocene Siena Basin, and gave rise to space accommodation for clayey and sandy marine sediments. Hydrothermal circulation (and related travertine deposition) was favoured by the damaging enhancement due to the fault–fault intersection. Tectonic activity has been also documented by deformation recorded by travertines, which suggest a main tectonic event between 64 ± 5 and 40 ± 5 ka. The tectonic activity described for the study area agrees with the Quaternary tectonic evolution documented in the surrounding areas (e.g. Mt. Amiata and Mt. Vulsini), as well as the Tyrrhenian margin of the Central Apennines, indicating that a widespread tectonic activity affected the inner part of the Apennines until the latest Quaternary.