Results 51 to 60 of about 4,888 (235)
Geological Journal, Volume 61, Issue 3, Page 566-592, March 2026.Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae +6 more
wiley +1 more source
Allanite occurrences in Westland, New Zealand [PDF]
New Zealand Journal of Geology and Geophysics, 1985 Abstract Allanite occurs widely as an accessory mineral in granitoid rocks from Westland, New Zealand, and is particularly characteristic of tonalites. It is rare in metamorphic rocks. Microprobe analyses show a fair uniformity in composition; the range of rare earth concentrations (weight percent) is La2O3 1.86–7.19; Ce2O3 6.48–12.1; Nd2O3 2.89–5.04 ...
openaire +1 more source
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 3, March 2026.Abstract The subduction of the Paleo‐Pacific Plate beneath the NE Asian continental margin induced extensive magmatism, providing an excellent opportunity to investigate the interplay between plate dynamics, arc magmatism, continental crust formation, and porphyry mineralization.
Honghui Wang +5 more
wiley +1 more source
The Encantada Granite: registration of a peraluminous intrusion in the Rondonian Province - San Ignacio, in SW Amazonic Craton, Mato Grosso, Brazil [PDF]
Geologia USP. Série Científica, 2015 The Encantada Granite occurs on the extreme southwest of the state of Mato Grosso, SW of the Amazonian Craton, near the border of Brasil/Bolívia. It corresponds to an body oriented to NNW direction that intruded metasedimentary and metavolcanic rocks ...
Brena Verginassi do Nascimento +2 more
doaj +1 more source
Stability and isotopic dating of monazite and allanite in partially molten rocks: examples from the Central Alps [PDF]
, 2018 We investigated the stability of monazite and allanite as a function of bulk rock composition within several types of Tertiary Alpine anatexites, characterized by different compositions and melting reactions, but similar P-T conditions of melting.
Berger, Alfons +2 more
core
Implications of zeolites and their zonation in the Cajon Pass Deep Drillhole [PDF]
, 1988 Zeolites occur in all cores and most cuttings samples of plutonic and gneissic rock from the Cajon Pass Deep Drillhole. Laumontite or stilbite replace plagioclase and fill fractures
James, Eric W., Silver, Leon T.
core +1 more source
Tectonics, Volume 45, Issue 3, March 2026.Abstract In the Afghan Hindu Kush, the 223–209 Ma (≤800°C) Salang batholith is part of the Silk‐Road magmatic arc that was built on ∼40‐km‐thick Turan‐Karakum block continental crust. The batholith constitutes the hanging wall of the Herat‐Panjshir‐Badakhshan—the Paleo‐Tethys—suture zone, vestige of the subducted Paleozoic‐early Mesozoic Paleo‐Tethys ...
Lothar Ratschbacher +8 more
wiley +1 more source
Assessing Pb Isotopic Equilibrium Between Apatite and K‐Feldspar
Geochemistry, Geophysics, Geosystems, Volume 27, Issue 2, February 2026.Abstract Quantifying common Pb, the non‐radiogenic Pb present in a mineral independent of in situ U decay, is essential for obtaining accurate U–Pb ages in common Pb‐bearing minerals such as apatite. However, constraining the amount and composition of common Pb, as well as the timing of its entrapment, remains a persistent challenge.
Priyanjan Datta +3 more
wiley +1 more source
Inferences on the Mesozoic evolution of the North Aegean from the isotopic record of the Chalkidiki block [PDF]
, 2016 International audienceThe Chalkidiki block is a major domain in the North Aegean that, contrary to other domains in the region, largely escaped thermal perturbations during Tertiary extension.
Brun, Jean-Pierre +4 more
core +2 more sources
P‐T‐t‐d Evolution of Low‐Grade Metamorphic Xenotime, Eastern Alps (Austria)
Terra Nova, Volume 38, Issue 1, Page 65-76, February 2026.ABSTRACT In situ LA‐ICP‐MS U‐Pb dating of xenotime was used to establish the age of low‐grade metamorphism in Permian metasediments of the Austroalpine Unit (Eastern Alps, Austria). Complexly zoned xenotime in chloritoid‐bearing metasedimentary samples possesses distinct MREE‐rich domains. In the eastern sample, this domain yielded a date of c. 135 Ma,
M. S. Hollinetz +4 more
wiley +1 more source