Results 11 to 20 of about 811 (185)

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

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

Detrital zircon geochronology of Paleoproterozoic metasedimentary rocks from Jämsä, Central Finland [PDF]

Bulletin of the Geological Society of Finland
In this short communication, we present new detrital single grain zircon U-Pb data for six metasedimentary rock samples from Jämsä, Central Finland.
Perttu Mikkola, Matti Kurhila, Hannu Huhma   +2 more
doaj   +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

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

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

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

Slab-derived devolatilization fluids oxidized by subducted metasedimentary rocks

Nature Geoscience, 2022
AbstractMetamorphic devolatilization of subducted slabs generates aqueous fluids that ascend into the mantle wedge, driving the partial melting that produces arc magmas. These magmas have oxygen fugacities some 10–1,000 times higher than magmas generated at mid-ocean ridges.
Jay J. Ague, Santiago Tassara, Megan E. Holycross, Ji-Lei Li, Elizabeth Cottrell, Esther M. Schwarzenbach, Charalampos Fassoulas, Timm John   +7 more
openaire   +1 more source

Permian Hydrothermal Alteration Preserved in Polymetamorphic Basement and Constraints for Ore-genesis (Alpi Apuane, Italy)

Geosciences, 2020
The reconstruction of the polymetamorphic history of basement rocks in orogens is crucial for deciphering past geodynamic evolution. However, the current petrographic features are usually interpreted as the results of the metamorphic recrystallization of
Simone Vezzoni, Diego Pieruccioni, Yuri Galanti, Cristian Biagioni, Andrea Dini   +4 more
doaj   +1 more source