Zircon ages and geochemistry are presented for igneous rocks from SW Vietnam S Cambodia. Four main age groupings occur: Cretaceous (107–75 Ma), Early Jurassic (195 Late Triassic (230–222 Permian (294–265 Ma). samples amphibole-bearing biotite granodiorites to granites occur mainly east of the Kampot Fold Belt. Pre-Cretaceous within Belt dominantly felsic volcanics. The primarily high-K calc-alk...

Indonesia is a country that has several world-class copper-gold deposits, particularly in eastern Sunda arc. The Hu’u complex prospects the surface as lithocap of extensive epithermal style alteration, but some were detected associated with porphyry beneath surface. study focuses on hydrothermal breccia cement factor influencing system district. methods used mineralogical analysis petrography a...

The oldest recognized proxies for low atmospheric oxygen are massive iron-rich deposits. Following the rise of ∼2.4 billion years ago (Ga), iron formations (IFs) largely disappear from geologic record, only to reappear in a pulse ∼1.88 Ga, which has been attributed sea-level transgressions, changing ocean chemistry triggered by intense volcanism, or lowered levels. North American Gogebic Range ...

Abstract Inclination is the angle of a magnetization vector from horizontal. Clastic sedimentary rocks often experience inclination shallowing whereby syn‐ to post‐depositional processes result in flattened detrital remanent magnetizations relative local geomagnetic field inclinations. The deviation recorded inclinations true values presents challenges for reconstructing paleolatitudes. A wides...