Travertine deposition and faulting: the fault-related travertine fissure-ridge at Terme S. Giovanni, Rapolano Terme (Italy)
Travertine deposition and faulting: the fault-related travertine fissure-ridge at Terme S. Giovanni, Rapolano Terme (Italy)
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DOI：
10.1007/s00531-007-0290-z
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发表时间：
2009-06
影响因子：
2.3
通讯作者：
A. Brogi;E. Capezzuoli
中科院分区：
文献类型：
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作者：
A. Brogi;E. Capezzuoli
本文描述了一个沿着米级位移的正断层走向发育的裂隙脊的实例，该断层位于锡耶纳盆地东部边缘，位于泰尔梅南部。乔瓦尼地区（拉波拉诺泰尔梅，意大利）。这一地貌构造特征长250 m，宽30 m，高10 m，是由过饱和热沃茨（39.9°C）形成的，这些水来自温泉，这些温泉沿着正断层的痕迹排列，这些正断层切割不超过晚更新世（24 ± 3 ka）的断层。在脊顶部，沿着脊顶有一条最大宽度为20厘米的直的、连续的裂缝。热流体从主要位于海脊末端的锥状体流出，在那里沉积了钙钛矿。断层陡坎的下伏构造是一个不对称的剖面。坡高差与正断层的垂直位移相对应。沿着脊裂走向的现代热液矿床的破裂，以及现代热液循环，使我们相信泰尔梅S。乔瓦尼正断层目前可能处于活动状态。总体而言，泰尔梅S.乔瓦尼裂脊可定义为一条逆冲断层形迹裂脊，为研究断层活动与逆冲沉积的关系提供了有益的例证。
In this paper we describe an example of travertine fissure-ridge development along the trace of a normal fault with metre displacement, located in the eastern margin of the Neogene–Quaternary Siena Basin, in the Terme S. Giovanni area (Rapolano Terme, Italy). This morphotectonic feature, 250 m long, 30 m wide and 10 m high, formed from supersaturated hot waters (39.9°C) flowing from thermal springs aligned along the trace of the normal fault dissecting travertines not older than Late Pleistocene (24 ± 3 ka). A straight, continuous fissure with a maximum width of 20 cm occurs at the top of the ridge, along its crest. Hot fluids flow from cones mainly located at the extremities of the ridge, where travertine is depositing. The travertine fissure-ridge shows an asymmetrical profile since it buries the fault scarp. The difference in height of slopes corresponds to the vertical displacement of the normal fault. Fissuring of the recent travertine deposits along the strike of the crestal fissure, as well as recent hydrothermal circulation, lead us to believe that the Terme S. Giovanni normal fault may be currently active. On the whole, the Terme S. Giovanni fissure ridge can be defined as a travertine fault trace fissure-ridge, adding a helpful example for studying the relationship between faulting and travertine deposition.