Very recent karst landforms within Cagli crater, Sinus Meridiani, Mars

2019 ◽  
Vol 138 (2) ◽  
pp. 262-273 ◽  
Author(s):  
Davide Baioni
Keyword(s):  
Karst Landforms ◽  
Sinus Meridiani

scholarly journals Origin of the low-medium temperature hot springs around Nanjing, China

2021 ◽  
Vol 13 (1) ◽  
pp. 820-834
Author(s):  
Jun Ma ◽  
Zhifang Zhou
Keyword(s):  
Hot Springs ◽  
Hot Spring ◽  
Hot Water ◽  
Geothermal Water ◽  
Geological Condition ◽  
Medium Temperature ◽  
Rock Interaction ◽  
Karst Landform ◽  
Karst Landforms ◽  
Development And Management

Abstract The exploration of the origin of hot spring is the basis of its development and utilization. There are many low-medium temperature hot springs in Nanjing and its surrounding karst landform areas, such as the Tangshan, Tangquan, Lunshan, and Xiangquan hot springs. This article discusses the origin characters of the Lunshan hot spring with geological condition analysis, hydrogeochemical data, and isotope data. The results show that the hot water is SO4–Ca type in Lunshan area, and the cation content of SO4 is high, which are related to the deep hydrogeological conditions of the circulation in the limestone. Carbonate and anhydrite dissolutions occur in the groundwater circulation process, and they also dominate the water–rock interaction processes in the geothermal reservoir of Lunshan. The hot water rising channels are deeply affected by the NW and SN faults. Schematic diagrams of the conceptual model of the geothermal water circulation in Lunshan are plotted. The origin of Tangshan, Tangquan, and Xiangquan hot springs are similar to the Lunshan hot spring. In general, the geothermal water in karst landforms around Nanjing mainly runs through the carbonate rock area and is exposed near the core of the anticlinal structure of karst strata, forming SO4–Ca/SO4–Ca–Mg type hot spring with the water temperature less than 60°C. The characters of the hot springs around Nanjing are similar, which are helpful for the further research, development, and management of the geothermal water resources in this region.

Characterization and Delineation of Gypsum Karst Geohazards Using 2D Electrical Resistivity Tomography in Culberson County, Texas, USA

2017 ◽  
Vol 22 (4) ◽  
pp. 411-420
Author(s):  
Adam F. Majzoub ◽  
Kevin W. Stafford ◽  
Wesley A. Brown ◽  
Jon T. Ehrhart
Keyword(s):  
Electrical Resistivity ◽  
Electrical Resistivity Tomography ◽  
Chihuahuan Desert ◽  
Two Dimensional ◽  
Resistivity Tomography ◽  
Delaware Basin ◽  
Earth Resistivity ◽  
Array Configuration ◽  
Resistivity Data ◽  
Karst Landforms

The Delaware Basin of W Texas and SE New Mexico is the western subdivision of the Permian Basin and a northern extension of the Chihuahuan Desert. The major evaporite unit within the Delaware Basin is the Castile Formation, which consists of gypsum/anhydrite and is highly susceptible to dissolution and karstification. Manifestations of karst within the Castile outcrop are abundant and include sinkholes, subsidence features and caves, both epigene and hypogene in origin. Land reconnaissance surveys conducted during 2015 and 2016 documented abundant karst landforms near major thoroughfares in Culberson County, Texas. Two dimensional (2D) electrical resistivity surveys were conducted at four sites to characterize and delineate karst related hazards, both laterally and vertically, associated with the road. The electrical resistivity data were collected with a multi-electrode earth resistivity meter using a dipole-dipole array configuration. The resistivity data were then processed using EarthImager2D to produce inverted profile sections of each site. Two-dimensional electrical resistivity tomography was shown to be an effective non-invasive method in detecting solution conduits, soil filled voids, and fractured bedrock in the shallow subsurface in addition to those directly observed on the surface.

New species of Hemerodromia Meigen (Diptera: Empididae: Hemerodromiinae) associated with limestone karstic waters in Thailand

Zootaxa ◽  
2020 ◽  
Vol 4758 (3) ◽  
pp. 549-560
Author(s):  
ADRIAN R. PLANT
Keyword(s):  
New Species ◽  
Karst Landforms ◽  
Species Descriptions ◽  
Calcareous Streams ◽  
First Time

Species descriptions are provided for five new species of Hemerodromia (H. aliaextriata sp. nov., H. deprimatura sp. nov., H. oretenebraea sp. nov., H. pairoti sp. nov. H. samoha sp. nov.). The new species have an apparently obligate association with calcareous streams, rivers and tufa formations in limestone karst landforms in Thailand. Hemerodromia menghaiensis Yang & Yang is here reported for the first time in Thailand. 

Community composition and cold tolerance of soil Collembola in a collapse karst doline with strong microclimate inversion

Biologia ◽  
2015 ◽  
Vol 70 (6) ◽  
Author(s):  
Natália Raschmanová ◽  
Dana Miklisová ◽  
Ľubomír Kováč ◽  
Vladimír Šustr
Keyword(s):  
Species Richness ◽  
Cold Tolerance ◽  
Lethal Dose ◽  
Abundant Species ◽  
Local Diversity ◽  
Cold Tolerant ◽  
Broad Variety ◽  
Protaphorura Armata ◽  
Karst Landforms ◽  
Collapse Doline

AbstractThe study compared communities of soil Collembola along the inversed microclimatic gradient of the collapse doline of the Silicka ľadnica Ice Cave (Slovakia) in spring and autumn of 2005. Kruskal-Wallis ANOVA and the Mann- Whitney test revealed significant differences in abundance between sites and both seasons. Significantly higher abundance means and species richness were observed at most sites during the spring compared with the autumn. NMS ordination documented a clear delimitation of communities with remarkably different soil microclimates. The community pattern of the coldest section of the gradient, with low species richness and high mean abundance, was analogous to communities living in the harsh alpine and polar soils. The collapse doline with inversed microclimate hosted a high number of species (72) and a broad variety of montane forms (13), thus documenting that these karst landforms enhance local diversity of edaphic Collembola and serve as local refugia of specialized cold-tolerant species. The cold tolerance of the four abundant species at the doline cold sites, namely Ceratophysella sigillata, Tetrodontophora bielanensis, Protaphorura armata and Desoria tigrina, was tested in the laboratory using one-hour exposition survival tests. Within a temperature range from -2.4 to -7.8◦C, T. bielanensis was the most cold-sensitive species, with a lethal dose LD50 of -4.4◦C, while D. tigrina was the most cold-resistant, showing LD50 of -5.8◦C.

Geological Expedition and Analysis on Formation and Evolvement of Erosive Karst Tiankeng: A Case Study of Xingwen World Geopark

2011 ◽  
Vol 250-253 ◽  
pp. 2002-2006
Author(s):  
Wei Shui ◽  
Xing Gui Wang
Keyword(s):  
Flowing Water ◽  
Continuous Processes ◽  
Scenic Spot ◽  
New Type ◽  
Karst Landforms

Erosive Karst Tiankeng has been a new type of Tiankeng Since the Collapsed Karst Tiankeng was found and primarily research by Zhu Xuewen, a famous geologist. But, how the Erosive Karst Tiankeng evolved and developed? How can we find the proofs on formation and evolutional processes of Erosive Karst Tiankeng? Few scholar focused on this new field. According to the first-hand datum by geological Expedition and study in Xingwen World Geopark, the results and datum show that apart from Dayanwan and Xiaoyanwan collapsed karst Tiankeng, there are other karst landforms in Bowang Mount scenic spot of Xingwen World Geopark such us Feiwu Cave, Dao Cave, Cangshuiyan Gorge, Nanxing TanKeng and so on. These typical karst landforms could be regarded as different vestiges of erosive karst Tiankeng of Xingwen World Geopark, which stand for the evolutional processes of erosive karst Tiankeng separately. Moreover, the evolutional processes of erosive karst Tiankeng could be divided into the following continuous processes: an erosive karst Tiankeng develops from the processes of eroding and dissolving & extending of silo Sinkhole, and subsequently degrades to a large gorge or doline. It is worth pointing out that except for erosion of flowing water, at the same time, collapse’s effect has been playing extremely important role in the forming processes of these special erosive landforms.

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