Results 61 to 70 of about 4,520 (168)

Spherulite in the modern aragonitic travertine stromatolite has a calcite core with exopolymers

Sedimentology, Volume 73, Issue 5, Page 1421-1434, August 2026.
ABSTRACT Spherulites are spherical to ellipsoidal particles formed by various crystalline substances and can be abiotically synthesised in the laboratory. Among various spherulite types, spherulites composed of calcium carbonate are also found in various natural environments, but their abiotic or biotic origins are still controversial.
Fumito Shiraishi, Takayuki Akimoto, Naotaka Tomioka, Satoko Motai, Yoshio Takahashi   +4 more
wiley   +1 more source

Active Hydrothermal Hydrogen Emissions in Continental Collision Settings: Insights From the Southeastern Tibetan Plateau

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Natural hydrogen (H2) is a promising clean energy resource and a significant component of geothermal gases, yet its origins and release mechanisms remain poorly constrained. Here, we present geochemical and isotopic data (CO2, N2, Ar, H2, He, CH4, 3He/4He, δ13C‐CO2, and δ13C‐CH4) for hydrothermal gases from the Changning–Menglian suture (CMS),
Xuelian Huang, Xiaocheng Zhou, Jiao Tian, Yuwen Wang, Bingyu Yao, Zhaojun Zeng, Shuai Wang, Han Yan, Ruibin Li, Yingling Han, Yuxing Ren   +10 more
wiley   +1 more source

Hydrogeochemical characteristics and environmental significance of travertine landscape in Muji area

Shuiwen dizhi gongcheng dizhi
Travertine is a type of karst deposit widely distributed worldwide. Groundwater in karst areas is the main component of global water resources, providing a large number of ecological services and urban water supply.
Rui AN, Miao SUN, Yiwei ZHANG, Bin LI, Wenpeng LI, Kun LIU   +5 more
doaj   +1 more source

Photosynthesis of an endolithic Chlorococcum alga (Chlorophyta, Chlorococcaceae) from travertine calcium carbonate rocks of a tropical limestone Spring

Applied Phycology, 2022
A green alga, Chlorococcum sp. (Chlorococcales, Chlorophyceae), was grown from scrapings of the travertine rocks from the outlet stream of the Emerald Pool, Khlong Thom Nuea, Khlong Thom District Krabi province in Southern Thailand – a classic karstic ...
Raymond J. Ritchie, Suhailar Sma-Air
doaj   +1 more source

New Terrestrial Native Iron Discovered on Earth's Surface

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 7, July 2026.
Abstract Native iron is a major common mineral in lunar samples and meteorites but rarely occurs on Earth's surface, as its stability requires highly reducing conditions with very low oxygen fugacity. To date, native iron has mainly been found in basalts, ophiolites, and deep hydrothermal systems.
Tingwei Zhang, Shuhui Cai, Zhipeng Zeng, Youqian Li, Shixia Yang, Chenglong Deng   +5 more
wiley   +1 more source

Fossil findings from the Sıcak Çermik fissure ridge-type travertines and possible hominid tracks, Sivas, Central Turkey

Geodinamica Acta, 2018
Sıcak Çermik (Sivas) is an important geothermal and recent travertine formation area in Central Anatolia. The majority of travertines found in the region comprise fissure-ridge type travertines according to morphological classification.
B. Levent Mesci, Ahmet Cem Erkman, Halil Gürsoy, Orhan Tatar   +3 more
doaj   +1 more source

Seriality and Individualization: Carving the Fluted Sarcophagi from Hierapolis of Phrygia

Open Archaeology, 2023
Several marble sarcophagi, including both plain or fluted coffins and chests decorated with garlands, friezes, and elaborate compositions framed by columns and covered with roof-shaped or kline lids, are attested in the Roman burial grounds at Hierapolis
Anguissola Anna
doaj   +1 more source

Structural Evolution of a Polyphase Salt‐Tectonic System From Syn‐Rift Extension to Syn‐Orogenic Deformation in the Middle Atlas (Oum Er Rbia Region, Morocco)

Tectonics, Volume 45, Issue 7, July 2026.
Abstract Salt tectonics has received little attention in the Middle Atlas, despite the widespread occurrence of Triassic evaporites and their potential to exert first‐order control on basin architecture and deformation. This study presents the first integrated analysis of polyphase salt tectonics in the Middle Atlas, focusing on the Oum Er‐Rbia sector,
N. Saspiturry, G. Ballas, M. El Ghorfi, S. Echat, B. Viguier, N. Patris, A. Rhoujjati, N. Rhoujjati, A. Charbaoui, L. Hanich, V. Léonardi   +10 more
wiley   +1 more source

Investigation of the change in the characteristic properties of epoxy and silane coated natural stone surfaces

Bulletin of the Mineral Research and Exploration
Travertine is a natural stone with macro and micropores; these pores are connected by capillary means. Their visual appearance and porous structure add a different style and diversify their usage areas.
Mustafa Gürsoy, Hakan Çiftçi, Zehra Ebru Sayın   +2 more
doaj   +1 more source

Bio‐mediated cementation of supratidal beach sediments associated with groundwater springs

Sedimentology, Volume 73, Issue 4, Page 1271-1285, June 2026.
ABSTRACT The formation of beachrock, sensu stricto, via carbonate precipitation in the intertidal zone is widespread throughout the tropics and subtropics. While cementation of supratidal beach sediments has also been noted in several locations, it has received much less attention.
Thomas William Garner, J. Andrew G. Cooper   +1 more
wiley   +1 more source