Results 31 to 40 of about 6,037 (231)

Microfossils in metasediments from Prins Karls Forland, western Svalbard

Polar Research, 1988
The stratigraphic importance of fossils is never more apparent than in attempts to unravel the complexities of metamorphic terrains. The age and stratigraphic relationships of the thick metasedimentary and metavolcanic succession of Prins Karls Forland, western Svalbard, have been the subject of investigation and debate since the early part of this ...
A H, Knoll, Y, Ohta
openaire   +2 more sources

Precambrian crustal evolution and Cretaceous–Palaeogene faulting in West Greenland: Zircon geochronology from the Kangaatsiaq–Qasigiannguit region, the northern part of the 1.9–1.8 Ga Nagssugtoqidian orogen, West Greenland [PDF]

Geological Survey of Denmark and Greenland Bulletin, 2006
The Kangaatsiaq–Qasigiannguit region in the northern part of the Palaeoproterozoic Nagssugtoqidian orogen of West Greenland consists of poly-deformed orthogneisses and minor occurrences of interleaved, discontinuous supracrustal belts. Laser ablation ICP-
Conelly, James N., Thrane, Kristine
doaj  

(Table 1) Isotopic composition of noble gases from metasediments

, 2009
(Table 1) Isotopic composition of noble gases from ...
Altherr, Rainer, Schwarz, Winfried H, Rainer Altherr (7907291), Winfried H Schwarz (7907285), Trieloff, Mario, Mario Trieloff (7907288)   +5 more
core   +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  

Resolving Micrometre‐Scale Zircon Growth in Silicic Systems by 7 μm LA‐MC‐ICP‐MS U‐Pb Dating: Linking Petrology and Geochronology in Silicic Volcanic and Granitic Rocks from Victoria, Australia

Geostandards and Geoanalytical Research, EarlyView.
Key Points 7 μm spot‐diameter LA‐MC‐ICP‐MS analyses yield accurate zircon U‐Pb ages. 1013 Ω amplifier resistors improve low‐signal Pb measurements. Saturn correction protocols minimise down‐hole fractionation effects. We present a systematic evaluation of high spatial‐resolution zircon U‐Pb dating using a Thermo Scientific Neoma multi‐collector ICP‐MS ...
Cristiano Lana, John D. Clemens
wiley   +1 more source

Variable Sr Diffusion and Implications for Rb–Sr Biotite Geochronology

Journal of Metamorphic Geology, EarlyView.
ABSTRACT The rubidium–strontium (Rb–Sr) system has a long pedigree as a geochronological tool that relies on the application of an isochron approach. In particular, biotite contains strongly radiogenic Rb–Sr isotopes, and thus can yield meaningful crystallisation or cooling ages via this approach. However, the response of the Rb–Sr system in biotite to
Riley Rohrer, Christopher L. Kirkland, Hugo Olierook, Tim Johnson, Katy Evans   +4 more
wiley   +1 more source

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

A new approach to develop the Raman carbonaceous material geothermometer for low‐grade metamorphism using peak width

, 2014
The Raman spectra of carbonaceous material (CM) from 19 metasediment samples collected from six widely separated areas of Southwest Japan and metamorphosed at temperatures from 165 to 655°C show systematic changes with metamorphic temperature that can be
Y. Kouketsu, T. Mizukami, H. Mori, S. Endo, M. Aoya, H. Hara, D. Nakamura, S. Wallis   +7 more
semanticscholar   +1 more source

Protracted zircon growth in migmatites and In situ melt of Higher Himalayan Crystallines: U–Pb ages from Bhagirathi valley, NW Himalaya, India

Geoscience Frontiers, 2019
The Higher Himalayan Crystallines (HHC), in western Garhwal, Uttarakhand are located in a regional-scale intracontinental ductile shear zone (15–20 km wide) bounded by the Main Central Thrust at the base, and the South Tibetan Detachment System at the ...
Sandeep Singh
semanticscholar   +1 more source

Evaluating the sustainability of mineral water consumption using multi‐scale hydrogeophysics in Caxambu, Brazil

Near Surface Geophysics, Volume 24, Issue 3, Page 234-251, June 2026.
Abstract A better understanding of the near‐surface aquifer system of the Caxambu Water Park, located in the Minas Gerais State, Brazil, has been achieved. The study aimed to identify groundwater reservoirs and flow patterns and contribute to the hydrogeological conceptual model using a multi‐scale geophysical approach.
Emanuele F. La Terra, Miguel Tupinambá, Liliane P. Panetto, José Antonio N. Pereira, Tainã P. Oliveira, Antonio Carlos Pedrosa‐Soares   +5 more
wiley   +1 more source