Results 51 to 60 of about 23,492 (308)

Geochemical Signatures of Potassic to Sodic Adang Volcanics, Western Sulawesi: Implications for Their Tectonic Setting and Origin [PDF]

, 2016
DOI:10.17014/ijog.3.3.195-214The Adang Volcanics represent a series of (ultra) potassic to sodic lavas and tuffaceous rocks of predominantly trachytic composition, which forms the part of a sequence of Late Cenozoic high-K volcanic and associated ...
Fadlin, F. (Fadlin), Priadi, B. (Bambang), Shaban, G. (Godang)   +2 more
core   +2 more sources

Three Spodumene Reference Materials for Oxygen Isotope Measurement by Ion Microprobe

Geostandards and Geoanalytical Research, EarlyView.
Key Points Three spodumene reference materials were developed for SIMS oxygen isotope measurement. All three materials are homogeneous in oxygen isotopes. Crystal orientation has no effect on instrumental mass fractionation. This study reports on the development of three spodumene reference materials referred to as Curtin University (CU) Tri‐1, Kun‐A‐1
Andreas T. Hertwig, Johannes Chischi, Axel K. Schmitt, Hans C. Oskierski, Kai Rankenburg, Martin Wells, Benita Putlitz, Zakaria Quadir   +7 more
wiley   +1 more source

The Relationship Between Kimberlitic Magmatism and Electrical Conductivity Anomalies in the Mantle

Geophysical Research Letters, 2022
Kimberlites are igneous rocks whose formation remains enigmatic due to their severely altered nature, highly variable compositions and rapid ascent through the lithosphere.
Sinan Özaydın, Kate Selway
doaj   +1 more source

Archaean and Proterozoic diamond growth from contrasting styles of large-scale magmatism [PDF]

, 2017
Precise dating of diamond growth is required to understand the interior workings of the early Earth and the deep carbon cycle. Here we report Sm-Nd isotope data from 26 individual garnet inclusions from 26 harzburgitic diamonds from Venetia, South Africa.
Chinn, Ingrid L., Davies, Gareth R., Gress, Michael U., Harris, Jeff W., Jelsma, Hielke A., Koornneef, Janne M.   +5 more
core   +3 more sources

Fluid or Melt? Distinguishing Syn‐Deformational Interaction Pathways

Journal of Metamorphic Geology, EarlyView.
ABSTRACT Understanding whether deformation occurred in the presence of aqueous fluid or silicate melt is crucial for interpreting ductile shear zones, impacting their thermal and geochemical evolution, and having rheological consequences. To identify the syn‐deformational fluid type, we investigate contrasting shear zones active during the Alice ...
Hindol Ghatak, Nathan R. Daczko, Sandra Piazolo, Tom Raimondo   +3 more
wiley   +1 more source

The problems of zeolites detection and their influence on development of the productive reservoirs in the Messoyakha group of fields

Известия Томского политехнического университета: Инжиниринг георесурсов, 2019
It is found out that zeolites are formed in alkaline environment at diagenesis or katagenesis and reduce permeability and porosity of reservoir rocks. It is shown that zeolite content in reservoir rocks is directly related to the porosity value and can ...
Aleksandr Podnebeshykh, Vasily Ovchinnikov   +1 more
doaj   +2 more sources

Carbonate alteration of ophiolitic rocks in the Arabian–Nubian Shield of Egypt: sources and compositions of the carbonating fluid and implications for the formation of Au deposits [PDF]

, 2016
Ultramafic portions of ophiolitic fragments in the Arabian–Nubian Shield (ANS) show pervasive carbonate alteration forming various degrees of carbonated serpentinites and listvenitic rocks.
Azer, Mokhles K., Boskabadi, Arman, Boyce, Adrian, Broman, Curt, Cooper, Matthew J., Majka, Jaroslaw, Mohamed, Fathy H., Pitcairn, Iain K., Stern, Robert J., Teagle, Damon A.H.   +9 more
core   +2 more sources

Magnesium phosphate in the Cold Bokkeveld (CM2) carbonaceous chondrite

Meteoritics &Planetary Science, EarlyView.
Abstract Hydrous Mg‐phosphate was first described from astromaterials in particles returned from the C‐type asteroid Ryugu, and has subsequently been found in samples of the B‐type asteroid Bennu and CI1 carbonaceous chondrites. This phase may have been highly significant as a source of bioessential compounds for early Earth.
Martin R. Lee, Tobias Salge, Ian Maclaren   +2 more
wiley   +1 more source

Post-collisional Potassic–Ultrapotassic Magmatism of the Variscan Orogen: Implications for Mantle Metasomatism during Continental Subduction

Journal of Petrology, 2018
Mantle-derived potassic to ultrapotassic magmatism is a typical feature of collisional orogens. Potassium-rich magmas recurrently formed across the European Variscides during a period of 50 Myr, following the peak of the orogeny at 340 Ma.
Christian G Soder, R. Romer
semanticscholar   +1 more source

Evidence for late impact‐induced metasomatism on the brachinite parent body recorded by a phosphate assemblage in NWA 7828

Meteoritics &Planetary Science, EarlyView.
Abstract Brachinites are a group of ultramafic achondritic meteorites thought to sample a planetesimal from the early inner solar system. They yield predominately ancient crystallization ages within 4 Ma of CAI formation, and while the formation mechanism for these samples is debated, they are widely thought to be partial melt residues from a ...
L. F. White, B. G. Rider‐Stokes, M. Anand, R. Tartèse, J. R. Darling, G. Degli Alessendrini, R. Greenwood, K. T. Tait   +7 more
wiley   +1 more source