Results 21 to 30 of about 12,479 (212)

Age an origin of the "Mexican Onyx" at San Antonio Texcala (Puebla, Mexico) [PDF]

, 2001
A great variety of color banded CaC03 is known as „Mexican Onyx“, and is extensively used for ornamental purposes. Within the San Antonio Texcala mining district an area of about 24.000 m2 is covered by a thick travertine crust with a calculated volume ...
Fischer, Rudolf, Hernandez, Delfino, Michalzik, Dieter, Oezen, Deniz   +3 more
core   +2 more sources

Slovenské travertíny ako ušľachtilé kamene – stručná geologická charakteristika, história ťažby a využitia

Geologické práce. Správy
Twelve Slovak travertines were used for decorative purposes among thousands freshwater limestones, mainly in the 20th century. The history of block extraction and use of the travertines was reconstructed based on written sources, historical and ...
Daniel Pivko
doaj   +1 more source

Composition, size distribution, optical properties, and radiative effects of laboratory-resuspended PM₁₀ from geological dust of the Rome area, by electron microscopy and radiative transfer modelling [PDF]

Atmospheric Chemistry and Physics, 2015
In this work, new information has been gained on the laboratory-resuspended PM10 fraction from geological topsoil and outcropped rocks representative of the Rome area (Latium).
A. Pietrodangelo, R. Salzano, C. Bassani, S. Pareti, C. Perrino   +4 more
doaj   +1 more source

A preliminary analysis of the formation of travertine and travertine cones in the Jifei hot spring, Yunnan, China [PDF]

, 2012
The Jifei hot spring emerges in the form of a spring group in the Tibet–Yunnan geothermal zone, southwest of Yunnan Province, China. The temperatures of spring waters range from 35 to 81°C and are mainly of HCO3–Na·Ca type. The total discharge of the hot
Fang Bin, Liu Yaping, Yamanaka Tsutomu, Zhou Haiyan, Zhou Xun, 山中 勤   +5 more
core   +1 more source

Cause analysis of travertine blackening：A case study of travertine at Huanglong Ravine, Sichuan Province, China

Carsologica Sinica
Travertine is one of the most precious resources provided to human beings by nature, and its formation mechanism is highly complex. The formation process involves intricate interactions among multiple factors, including geomorphological features ...
Ruiyang JIANG, Qunwei DAI, Ting ZHANG, Zhiqing DENG, Lihui WANG, Jing SHAN, Yue RAN, Jun GAO, Jiangrong CAI, Guoyue WANG   +9 more
doaj   +1 more source

DEPOSITIONAL ARCHITECTURE, FACIES CHARACTER AND GEOCHEMICAL SIGNATURE OF THE TIVOLI TRAVERTINES (PLEISTOCENE, ACQUE ALBULE BASIN, CENTRAL ITALY)

Rivista Italiana di Paleontologia e Stratigrafia, 2017
Facies character, diagenesis, geochemical signature, porosity, permeability, and geometry of the upper Pleistocene Tivoli travertines were investigated integrating information from six borehole cores, drilled along a 3 km N-S transect, and quarry faces ...
GIOVANNA DELLA PORTA, ANDREA CROCI, MATTIA MARINI, SANDOR KELE   +3 more
doaj   +1 more source

The effects of temperature on mechanical properties of rocks [PDF]

International Journal of Mining and Geo-Engineering, 2020
In a natural condition, temperature variations and phase transition of pore water are the two most effective factors on the mechanical properties of rocks.
Jabbar Ashrafi, Lohrasb Faramarzi, Mohammad Darbor, Mostafa Sharifzadeh, Behnam Ferdosi   +4 more
doaj   +1 more source

Dynamics of precipitation pattern formation at geothermal hot springs

, 2006
We formulate and model the dynamics of spatial patterns arising during the precipitation of calcium carbonate from a supersaturated shallow water flow. The model describes the formation of travertine deposits at geothermal hot springs and rimstone dams ...
A. Pentecost, A. Pentecost, A. N. Kolmogorov, A. N. Kolmogorov, B. W. Fouke, B. W. Fouke, C. Buczynski, D. D. Zhang, E. Busenberg, H. Clemens, John Veysey, Nigel Goldenfeld, Pak Yuen Chan, R. A. Wooding, R. F. Dressler, R. W. Renaut   +15 more
core   +1 more source

Evolution of Pleistocene travertine depositional system from terraced slope to fissure-ridge in a mixed travertine-alluvial succession (Jebel El Mida, Gafsa, southern Tunisia)

Geodinamica Acta, 2017
The Quaternary stratigraphic record of Jebel El Mida, composed of continental deposits, is a useful example of concomitant travertines and alluvial deposition in an extensional setting. Travertine deposition occurred in a faulted Pleistocene alluvial fan
Mohsen Henchiri, Walid Ben Ahmed, Andrea Brogi, Mehmet Cihat Alçiçek, Ramdhane Benassi   +4 more
doaj   +1 more source

Sarıhıdır manganese mineralization related to travertine, Central Anatolian Volcanic Province, Turkey

Geodinamica Acta, 2020
Sarıhıdır travertines and associated manganese mineralization are located in an area known as the Central Anatolian Volcanic Province (CAVP). The topic of the study, the Sarıhıdır manganese mineralization, was deposited in association with fault zones in
İsmail Koçak
doaj   +1 more source