Results 41 to 50 of about 22,288 (246)

Re-identification of c. 15 700 cal yr BP tephra bed at Kaipo Bog, eastern North Island: implications for dispersal of Rotorua and Puketarata tephra beds. [PDF]

, 2003
A 10 mm thick, c. 15 700 calendar yr BP (c. 13 100 14C yr BP) rhyolitic tephra bed in the well-studied montane Kaipo Bog sequence of eastern North Island was previously correlated with Maroa-derived Puketarata Tephra.
Lowe, D, Smith, Victoria C., Lowe, David J., Phil Shane, Shane, P, Nairn, Ian A., Shane, Phil A.R., Victoria C. Smith, David J. Lowe, Smith, VC, Nairn, IA, Ian Nairn   +11 more
core   +1 more source

Effects of Microbial-Mineral Interactions on Organic Carbon Stabilization in a Ponderosa Pine Root Zone: A Micro-Scale Approach

Frontiers in Earth Science, 2022
Soil microbial communities affect the formation of micro-scale mineral-associated organic matter (MAOM) where complex processes, including adhesion, aggregate formation, microbial mineral weathering and soil organic matter stabilization occur in a narrow
Alice C. Dohnalkova, Malak M. Tfaily, Malak M. Tfaily, Rosalie K. Chu, A. Peyton Smith, Colin J. Brislawn, Tamas Varga, Alex R. Crump, Libor Kovarik, Linda S. Thomashow, James B. Harsh, C. Kent Keller, Zsuzsanna Balogh-Brunstad   +12 more
doaj   +1 more source

Mineral Chemistry of Chlorite Replacing Biotite from Granitic Rocks of the Canadian Appalachians [PDF]

Journal of Sciences, Islamic Republic of Iran, 2009
Chlorite flakes, as a product of alteration of biotite, the dominant ferromagnesian mineral in the Paleozoic granitic rocks of the Canadian Appalachians, have been analyzed by electron microprobe for major elements and by 57Fe M?ssbauer spectroscopy for ...
A.A. Tabbakh Shabani
doaj  

Research progress and current status of dynamic wave propagation characteristics in rock mass: A review

Deep Underground Science and Engineering, EarlyView.
This review elucidates the velocity–dispersion–attenuation coupling mechanisms of wave propagation in rock masses, compares six representative models, and reveals how pressure, temperature, mineral composition, and anisotropy jointly control dynamic responses in complex geological media.
Jiajun Shu, Tao Li, Ruiqi Yuan, Yue Li, Bingni Wu, Bo Liu, Zhengding Deng, Galindo Rubén, Fausto Molina‐Gómez   +8 more
wiley   +1 more source

Biotites in granites, biotites in gneisses, and the status of biotite as a one-mineral environment indicator

Bulletin of the Geological Society of Finland, 1970
Some aspects of one-mineral geological environment indicators are discussed. Factors controlling the composition of biotite in different P, T, and chemical environments are reviewed. On the basis of theoretical considerations and empirical observation it is concluded that biotites in igneous granites may tend to be somewhat richer in iron than biotites
openaire   +2 more sources

Thermal‐induced fracture evolution and acoustic signature of Beishan granite: Insights into tensile strength of barrier system for high‐level radioactive waste disposal

Deep Underground Science and Engineering, EarlyView.
The tensile strength of granite, a proposed host for nuclear waste, degrades severely above 400°C. We link this to specific microcracking patterns captured by acoustic emission, establishing a scientific basis for assessing repository safety under thermal load.
Wei Zeng, Shijie Li, Xiaozhao Li, Zhen Huang, Shangtong Yang, Wentao Xu, Biao Wang, Yun Wu   +7 more
wiley   +1 more source

Biotite

, 2013
Educação Superior::Ciências Exatas e da Terra::GeoCiênciasThis image shows the mineral Biotite, common in the group of silicates and part of the group of micas. It contains potassium, magnesium, iron and aluminum in its composition. As the other minerals
U.S. Geological Survey
core   +2 more sources

Biotite

, 2016
Educação Superior::Ciências Exatas e da Terra::GeoCiênciasThis image shows the mineral Biotite, common in the group of silicates and part of the group of micas. It contains potassium, magnesium, iron and aluminum in its composition. As the other minerals
U.S. Geological Survey
core   +2 more sources