Columnar Trap Dyke of Potla, District Dewas, Madhya Pradesh, India: a Geological Marvel and Potential Geotourism Destination

IF 2.3 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Narendra Joshi, Vishnu Gadgil
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引用次数: 0

Abstract

India is endowed with rich geological heritage through its significant geological structures, geomorphologic features, landscapes of rocks, etc., and attracts the attention of earth scientists, nature lovers and common man too. Most landscape features possess unique values that need to be recognized nationally and internationally, conserved as Geoheritage sites as developed and promoted as Geotourism destinations. The present paper embodies and discusses aesthetic importance and geologic values of Columnar jointed basaltic dyke of Potla, also known as Kawadia Pahad—a geological treasure of Dewas District, Madhya Pradesh. The Potla dyke exposed in the form of seven detached linear ridges, trending ENE–WSW over a distance of 4.5 kms, having an average width of 80 m and exposed couple of meters (36 to 51 m) above the general ground level. The in situ columns in the dyke-ridges that so far been observed show straight, parallel faces without any striations. The length of the horizontal columns ranges between 1 and 3.60 m. The columns which are inclined and penetrated deep inside may have greater lengths. Such exposed columns have a height of 4.10 m which may be extending far downward. As far as diameter of the columns is concerned, it ranges between 30 and 50 cm. Each dyke-ridge consists perfectly separate, very well-developed, finely stacked and interlocked, horizontal to sub-horizontal columnar joints that inclined at various degrees. The columns are polygonal in the dyke-ridges, and majority show tetragon, pentagon, and hexagon shapes in cross section, but occasionally cyclic-hexagons can also be seen. The central part of the dyke, i.e. part of CR-5 and W-4 dyke-ridges, exhibits Dyke-Sill Hybrid Geometry. This monumental dyke-sill interface is not observed anywhere else except Columnar Trap Dyke of Potla, though this interpretation is based on orientation/interrelation of columns in the field. It is suggested that 66.6 ± 0.5 Ma is the crystallization age of the columnar basaltic dyke of Potla. The dyke is rarest of rare, and therefore, numbers of amenities are recommended to fascinate the tourists so that this Geosite should be developed and promoted as a new Geotourism destination of India. The Potla dyke is picturesque and matchless in which the development of the columns is magnificent and the arrangement of the columns is amazing. This world-class dyke fulfils all the requirements of Geoheritage and Geotourism and should get the status of National Geological Monument (NGM). It should also be included in the list of IUGS Geological Heritage Sites.

Abstract Image

印度中央邦德瓦斯地区波特拉的柱状陷落堤:地质奇观和潜在的地质旅游目的地
印度拥有重要的地质结构、地貌特征、岩石景观等丰富的地质遗产,吸引着地球科学家、自然爱好者和普通人的目光。大多数地貌特征都具有独特的价值,需要得到国家和国际的认可,作为地质遗产地加以保护,并作为地质旅游目的地加以开发和推广。本文体现并讨论了 Potla 柱状节理玄武岩堤(又称 Kawadia Pahad)的美学重要性和地质价值,它是中央邦德瓦斯地区的地质瑰宝。波特拉堤坝以七条分离的线性山脊的形式露出地面,呈 ENE-WSW 走向,长 4.5 千米,平均宽度为 80 米,露出地面数米(36 至 51 米)。迄今为止观察到的堤脊中的原位岩柱显示出笔直的平行面,没有任何条纹。水平柱的长度在 1 至 3.60 米之间。这些外露的柱子高度为 4.10 米,可能向下延伸了很远。岩柱的直径在 30 厘米到 50 厘米之间。每条堤脊都由完全独立、非常发达、细密堆叠和交错的水平至次水平柱状节理组成,这些节理呈不同程度的倾斜。堤脊上的柱状节理呈多边形,横截面大部分呈四角形、五角形和六角形,偶尔也能看到环状六角形。堤坝的中央部分,即 CR-5 和 W-4 堤脊的一部分,呈现出堤坝-山体混合几何形状。除了 Potla 的柱状陷落堤外,在其他任何地方都没有观察到这种不朽的堤-岩界面,尽管这种解释是基于实地柱状的方向/相互关系。据推测,66.6 ± 0.5 Ma 是波特拉柱状玄武岩堤的结晶年龄。该堤坝是罕见中的罕见,因此建议提供大量便利设施以吸引游客,从而将该地质遗迹作为印度新的地质旅游目的地加以开发和推广。波特拉堤坝风景如画,无与伦比,其中柱子的发展非常壮观,柱子的排列也令人惊叹。这一世界级堤坝符合地质遗产和地质旅游的所有要求,应获得国家地质遗迹(NGM)的地位。它还应被列入国际地质科学联合会地质遗产地名录。
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来源期刊
Geoheritage
Geoheritage GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
5.10
自引率
34.50%
发文量
107
期刊介绍: The Geoheritage journal is an international journal dedicated to discussing all aspects of our global geoheritage, both in situ and portable. The journal will invite all contributions on the conservation of sites and materials - use, protection and practical heritage management - as well as its interpretation through education, training and tourism. The journal wishes to cover all aspects of geoheritage and its protection. Key topics are: - Identification, characterisation, quantification and management of geoheritage; - Geodiversity and geosites; - On-site science, geological and geomorphological research: - Global scientific heritage - key scientific geosites, GSSPs, stratotype conservation and management; - Scientific research and education, and the promotion of the geosciences thereby; - Conventions, statute and legal instruments, national and international; - Integration of biodiversity and geodiversity in nature conservation and land-use policies; - Geological heritage and Environmental Impact Assessment studies; - Geological heritage, sustainable development, community action, practical initiatives and tourism; - Geoparks: creation, management and outputs; - Conservation in the natural world, Man-made and natural impacts, climate change; - Geotourism definitions, methodologies, and case studies; - International mechanisms for conservation and popularisation - World Heritage Sites, National Parks etc.; - Materials, data and people important in the history of science, museums, collections and all portable geoheritage; - Education and training of geoheritage specialists; - Pedagogical use of geological heritage - publications, teaching media, trails, centres, on-site museums; - Linking the United Nations Decade of Education for Sustainable Development (2005- 2014) with geoconservation.
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