Results 1 to 10 of about 822 (163)

Abiotic synthesis of graphitic carbons in the Eoarchean Saglek-Hebron metasedimentary rocks [PDF]

Nature Communications
Graphite in metasedimentary rocks of the Eoarchean Saglek-Hebron Gneiss Complex (Canada) is depleted in 13C and has been interpreted as one of the oldest traces of life on Earth.
Zixiao Guo, Dominic Papineau, Jonathan O’Neil, Hanika Rizo, Zhong-Qiang Chen, Xincheng Qiu, Zhenbing She   +6 more
doaj   +5 more sources

New age constraints for metasedimentary rocks in southern Finland [PDF]

Bulletin of the Geological Society of Finland, 2023
Metasedimentary rocks from nine sampling sites in southern Finland and an intermediate dyke in one of these sites were sampled for analysis of U–Pb zircon age and geochemical composition.
Paula Salminen, Matti Kurhila
doaj   +2 more sources

Geochemical constraints on provenance and source area weathering of metasedimentary rocks from the Paleoproterozoic (~2.1 Ga) Wa-Lawra Belt, southeastern margin of the West African Craton

Geodinamica Acta, 2019
The Wa-Lawra Belt which is situated in the northern part of Ghana consists of Paleoproterozoic Birimian fine metasedimentary rocks metamorphosed to greenschist facies, particularly, in the western part.
Daniel Asiedu, Chris Yao Anani, Prosper Nude   +2 more
exaly   +2 more sources

The south margin of the central Altyn is an early paleozoic tectonic unit confirmed by Zircon dating evidence [PDF]

Scientific Reports
The south margin of Central Altyn (SMCA) has long been considered as Precambrian stratigraphic unit of the Altyn Orogen. However, their strata attribution is subjected to challenge by the new finding of Siluran-Devonian metamorphic rocks.
Tuo Ma, Liang Liu, Shihao Zhang, Yongsheng Gai, Mingguo Zhai   +4 more
doaj   +2 more sources

Rheology of Metasedimentary Rocks at the Base of the Subduction Seismogenic Zone [PDF]

Geochemistry, Geophysics, Geosystems, 2022
AbstractThe Arosa Zone, Central Alps, represents a Cretaceous to Paleogene fossil subduction interface from paleodepths of 10 to >35 km. Metasedimentary schists directly below a preserved seismogenic zone exhibit viscous (foliations, folds, and lineations) and brittle (crack‐seal quartz ± calcite veins) deformation features. Si‐in‐phengite barometry
Cailey B. Condit, Melodie E. French, Justin A. Hayles, Laurence Y. Yeung, Emily J. Chin, Cin‐Ty A. Lee   +5 more
openaire   +2 more sources

Stratigraphy of the Pitangui Synclinorium, northwest of the Quadrilátero Ferrífero mineral province - Brazil: magmatism and sedimentation from Archean to Neoproterozoic

Journal of the Geological Survey of Brazil, 2023
The Pitangui Synclinorium is located in the northwestern portion of the Quadrilátero Ferrífero mineral province, São Francisco Craton, in southeast Brazil.
Marcelo de Souza Marinho, Joana Reis Magalhães, Julio Cesar Lombello, Joanna Araújo, Luiz Paulo Pedrosa Di Salvio, Rosane Nascimento Silva, Denise Canabrava Brito, Wilson Luis Feboli, Camila Franco Basto   +8 more
doaj   +1 more source

Thermal conductivity anisotropy of metasedimentary and igneous rocks [PDF]

Journal of Geophysical Research: Solid Earth, 2007
Thermal conductivity anisotropy was determined for three sets of metasedimentary and igneous rocks from central Utah, USA. Most conductivity measurements were made in transient mode with a half‐space, line source instrument oriented in two orthogonal directions on a flat face cut perpendicular to bedding.
Michael G. Davis, David S. Chapman, Thomas M. Van Wagoner, Phillip A. Armstrong   +3 more
openaire   +1 more source

AGE AND SOURCES OF DETRITAL MATERIAL FOR THE METASEDIMENTARY ROCKS OF THE NILAN TERRANE OF THE MONGOL-OKHOTSK OROGENIC BELT

Геодинамика и тектонофизика, 2022
The paper presents the first results of U-Th-Pb (LA-ICP-MS) isotopic dating of detrital zircons from the Paleozoic (?) metasedimentary rocks of the Nilan Terrane of the Mongol-Okhotsk orogenic belt to refine the age estimates and determine their probable
V. A. Zaika, A. A. Sorokin, V. B. Khubanov, V. P. Kovach   +3 more
doaj   +1 more source

GENETIC AND EXPLORATION IMPLICATIONS OF THE ZINC RATIO [100 Zn/(Zn + Pb)] IN THE RODRUIN PROSPECTING AREA OF THE GOLDEN TRIANGLE -EGYPT [PDF]

Delta Journal of Science, 2022
Rodruin Prospecting Area (26o21/59//N, 33o20/32//) in the Golden Triangle -Egypt, was exploited by the Ancient Egyptian Miners. They exploited gold from gossans and gossanous gold-bearing quartz veins.
Hassan Harraz, Mohamed Hamdy, Samir Aly, Samar Abdlla   +3 more
doaj   +1 more source

The Recovery of Fine Cassiterite from Metasedimentary Rock [PDF]

Journal of Geological Resource and Engineering, 2016
It is known that ore containing cassiterite (SnO2) has been our most important source of tin since antiquity and its successful separation continuously pose problems to mineral processors. The situation is more pronounced since the depletion of the more easily recoverable alluvial reserves forces us to work with the more complex deposits such as ...
null Ismail Ibrahim, null Md Muzayin Alimon, null Salmah Baharuddin   +2 more
openaire   +1 more source