Results 11 to 20 of about 537 (93)

Preserved carbon isotope compositions in 3.7 billion year old detrital organic matter from the Isua Supracrustal Belt

Communications Earth & Environment
Graphite found along contiguous horizons in the metamorphosed detrital sediments from the ≥ 3.7 Ga Isua Supracrustal Belt in Southwest Greenland may represent the oldest remains of life on Earth.
Magnus A. R. Harding, Austin Jarl Boyd, Jeffrey T. Osterhout, Elizabeth A. Bell, Nozomi Matsuda, Minik T. Rosing, Tue Hassenkam   +6 more
doaj   +2 more sources

Lawsonite and Garnet Oxygen Isotope Record of Fluid‐Rock Interaction During Subduction

Geochemistry, Geophysics, Geosystems
During the subduction of an oceanic plate, fluids are released from metabasaltic crust, metasediment, and serpentinite under high‐pressure/low‐temperature conditions.
Patricia Kang, Laure A. J. Martin, Alberto Vitale Brovarone, Donna L. Whitney   +3 more
doaj   +2 more sources

Garnet Geochemistry and Lu-Hf Geochronology of a Gold-Bearing Sillimanite-Garnet-Biotite Gneiss at the Borden Lake Belt

Geosciences, 2022
The Kapuskasing Structural Zone transects the Wawa and Abitibi greenstone belts in the Superior province of the Canadian Shield. At the southern margin of the Kapuskasing Structural Zone (KSZ), the Borden Gold deposit hosts low-grade-gold mineralization ...
Daniel LaFontaine, Audrey Bouvier, Mary Louise Hill   +2 more
doaj   +1 more source

Tracing fluid transfers in subduction zones: an integrated thermodynamic and δ¹⁸O fractionation modelling approach [PDF]

Solid Earth, 2020
Oxygen isotope geochemistry is a powerful tool for investigating rocks that interacted with fluids, to assess fluid sources and quantify the conditions of fluid–rock interaction. We present an integrated modelling approach and the computer program PTLoop
A. Vho, P. Lanari, D. Rubatto, D. Rubatto, J. Hermann   +4 more
doaj   +1 more source

The Petrology of the Wong Tei Tung Stone Tool Manufacturing Site, Sham Chung, Hong Kong Sar, China

Internet Archaeology, 2009
The Wong Tei Tung archaeological site was discovered in 2003. Two periods have been proposed: an earlier period dating to around 40,000 years bp, and a later period dating to around 7000 years bp, but these dates should be treated cautiously.
Vin Davis, Rob Ixer
doaj   +1 more source

The age of the ferropicritic volcanics and comagmatic Ni-bearing intrusions at Pechenga, Kola Peninsula, U.S.S.R. [PDF]

Bulletin of the Geological Society of Finland, 1990
Sm-Nd, Pb-Pb and U-Pb isotopic results are presented for samples from the Pilgujärvi Suite of the Pechenga Series. Whole rock samples and clinopyroxenes of ferropicritic volcanics yield a Sm-Nd isochron age of 1990 ± 66 Ma with εNd + 1.6 ± 0.4.
E. Hanski, H. Huhma, V.F. Smolkin, M. Vaasjoki   +3 more
doaj   +1 more source

Genesis of the Halılar Metasediment-Hosted Cu-Pb (±Zn) Mineralization, NW Turkey: Evidence from Mineralogy, Alteration, and Sulfur Isotope Geochemistry

, 2022
This study contributes to our understanding of the evolution of Halılar Cu-Pb (±Zn) mineralization (NW Turkey) based on mineralogical and geochemical results and sulfur isotope data.
Demet Kiran Yildirim
core   +1 more source

The High Resolution Transmission Electron Microscopy: A Powerful Tool for Studying the Organization of Terrestrial and Extra-Terrestrial Carbons

, 2005
International audienceHigh Resolution Transmission Electron Microscopy (HRTEM) makes possible the imaging of the profile of the polyaromatic layers, allowing a knowledge of carbons, such as disordered natural carbons from meteorites and from Precambrian ...
Rouzaud, Jean-Noel, Robert, F., Bonal, Lydie, Quirico, Eric, Skrzypczak, A., Derenne, S.   +5 more
core   +4 more sources

Tracking Deep Sediment Underplating in a Fossil Subduction Margin: Implications for Interface Rheology and Mass and Volatile Recycling

Geochemistry, Geophysics, Geosystems, 2021
The architecture and mechanical properties of the subduction interface impact large‐scale subduction processes, including mass and volatile recycling, upper‐plate orogenesis, and seismic behavior.
C. M. Tewksbury‐Christle, W. M. Behr, M. A. Helper   +2 more
doaj   +1 more source

ANALISIS PELEDAKAN PADA BATUAN META-SEDIMEN DENGAN STUKTUR LAMINASI DI TAMBANG BATUBARA

, 2021
PT Multi Nitrotama Kimia (PT MNK) merupakan salah satu perusahaan jasa pertambangan yang bergerak pada bidang penyedia jasa peledakan dan penjualan bahan peledak terbesar di Indonesia.
Isnaya, M. Syafiq, Pradatama, Dhion, Jaka, Slamet Rachman   +2 more
core   +1 more source