Results 61 to 70 of about 7,690 (304)

Lacustrine and fan‐delta sediments in syn‐rift lake basins

The Depositional Record, EarlyView.
A consistent model for the sequence framework and depositional pattern of asymmetric half‐grabens in syn‐rift lake basins bounded by active faults has been established, complementing existing models for marine rift successions. Syn‐rift lake basins are characterised by relatively small dimensions, steep slopes, poorly developed shoreline strata ...
Qianyou Wang, Yaohua Li, Hamed Sanei, Joe Gardner, Arka Rudra, James E. P. Utley, Richard H. Worden   +6 more
wiley   +1 more source

A study of radioactive elements of various rocks in Pattani Province with gamma ray spectrometer [PDF]

Songklanakarin Journal of Science and Technology (SJST), 2002
The radioactivity of the three elements, potassium, uranium and thorium, in rocks of various types in Pattani Province was investigated by using a gamma ray spectrometer.
Kaewtubtim, P., Changkean, S., Hmsuree, H.   +2 more
doaj  

Comparison between 2D and 3D microstructures and implications for metamorphic constraints using a chloritoid–garnet-bearing mica schist [PDF]

European Journal of Mineralogy
Despite the fact that rock textures depend on the 3D spatial distribution of minerals, our tectono-metamorphic reconstructions are mostly based on a 2D visualisation (i.e. thin sections).
F. Caso, A. Petroccia, S. Nerone, A. Maffeis, A. Maffeis, A. Corno, M. Zucali   +6 more
doaj   +1 more source

Relationship between Brittleness Index and Crack Initiation Stress Ratio for Different Rock Types

Advances in Civil Engineering, 2020
Brittleness and crack initiation stress (σci) are important rock mechanical properties and intrinsically related to rock deformation and failure. We establish the relationship between σci and uniaxial tensile strength (σt) based on the Griffith stress ...
Juyu Jiang, Dong Wang, Xinping Han, Shuai Di   +3 more
doaj   +1 more source

Thulium anomalies and rare earth element patterns in meteorites and Earth: Nebular fractionation and the nugget effect [PDF]

, 2015
This study reports the bulk rare earth element (REEs, La-Lu) compositions of 41 chondrites, including 32 falls and 9 finds from carbonaceous (CI, CM, CO and CV), enstatite (EH and EL) and ordinary (H, L and LL) groups, as well as 2 enstatite achondrites (aubrite).
arxiv   +1 more source

Petrogenetic and geochemical characteristics of some auriferous granitoids in the Kumasi Basin, Ghana: Implications for geodynamic settings and controls of orogenic gold mineralization in the Edikan Gold Mine

Deep Underground Science and Engineering, EarlyView.
The Fobinso granitoids are granodiorites, while the Esuajah granitoids are granites based on their mineralogical composition. The granitoids are generally enriched in LILE and LREE than HFSE, MREE, and HREE, indicating mixing with crustal sources during their evolution.
Emmanuel D. Sunkari, Obed Oppong, Theophilus K. Agbenyezi   +2 more
wiley   +1 more source

Characterization of Basement Fracture Reservoir In Field ‘X’, South Sumatera Basin, Based On The Analysis of Core And FMI Log

JGEET: Journal of Geoscience, Engineering, Environment and Technology, 2017
Basement reservoir is a reservoir that is located in the basement rock, comprised of either igneous rock or metamorphic rock that has secondary porosity, resulting in its capability to store oil and gas.
Hartawi Riskha, Ildrem Syafri, Ismawan Ismawan, Nanda Natasia   +3 more
doaj   +1 more source

Experimental and constitutive modeling investigations on marble in Jinping Underground Laboratory

Deep Underground Science and Engineering, EarlyView.
The objective of this study is to reveal the underlying mechanisms behind the brittle‐ductile transition of the marble through a combination of experimental research and constitutive modeling. A series of triaxial compression and triaxial cyclic loading tests are conducted.
Susheng Wang, Qiang Zhang, Hao Luo, Zhinan Lin   +3 more
wiley   +1 more source

Geochemical characteristics of apatite in metabasic rocks under different metamorphic conditions: a case study from the Paleoproterozoic Trans-North China Orogen

Dizhi lixue xuebao
Objective  Apatite is a common accessory mineral that is widely distributed in various rock types. Its U-Pb age, trace elements (particularly REE, Th, U, and Sr), and Sr-Nd isotopic compositions provide important information on its chronology and ...
YANG Yuqing, GAO Peng, ZHANG Jian, LIU Xiaoguang, CHENG Changquan, YIN Changqing, QIAN Jiahui   +6 more
doaj   +1 more source

Effects of life history strategies and habitats on limb regeneration in plethodontid salamanders

Developmental Dynamics, EarlyView.
Abstract Background Salamanders are the only tetrapods that exhibit the ability to fully regenerate limbs. The axolotl, a neotenic salamander, has become the model organism for regeneration research. Great advances have been made providing a detailed understanding of the morphological and molecular processes involved in limb regeneration.
Vivien Bothe, Hendrik Müller, Neil Shubin, Nadia Fröbisch   +3 more
wiley   +1 more source