Although Mars does not presently appear to have a global dynamo magnetic field, strong crustal fields have recently been detected by the Mars Global Surveyor above surfaces formed V3 or more Ga. We present magnetic and textural studies of Martian meteorite ALH84001 demonstrating that 4 Ga carbonates containing magnetite and pyrrhotite carry a stable natural remanent magnetization. Because 40Ar/...

The first known fossil ape from the early-middle Miocene of Fejej, Ethiopia, is described here. The specimen, FJ-18SB-68, is a partial ulna from a locality dated by 40Ar/39Ar and paleomagnetic methods to a minimum age of 16.18 MYA. Compared to a variety of extant and fossil ulnae, FJ-18SB-68 is most similar to Turkanapithecus, Proconsul, and Pliopithecus, and appears to have been an arboreal qu...

Introduction: The Kara River basin, located between the Pai-Khoi ridge and the Baydarata Gulf of the Kara Sea 200 km to the north of Vorkuta, Russia, was found to be an impact structure in 1970’s [1,2]. The 40Ar-39Ar impactite ages vary from 70 to 75 Ma [3,4]. Actually, two craters were suggested [1]: The Kara crater, 60-65 km in diameter, was defined on the Kara River estuary while the 25 km U...

The Don Manuel porphyry copper system, located in the Miocene–Pliocene metallogenic belt of central Chile, contains spatially zoned alteration styles common to other deposits including extensive potassic alteration, propylitic localized sericite-chlorite and argillic but lacks pervasive hydrolytic typical some deposits. It is one youngest Andes. Timing mineralization hydrothermal system at are ...

We present the results of U-Pb zircon dating conducted using laser ablation-inductively coupled plasma mass spectrometry (LA-ICP-MS), isotopic tracing analyses Hf in and Sr-Nd whole-rock major oxides, trace element abundances 12 plutonic volcanic rocks on Antarctic Peninsula. The dataset is presented combination with previous studies both Patagonia These were filtered for concordant 206Pb–238U ...

Among the marble-hosted ruby deposits in Himalayan tectonic belt, which yields highest-quality rubies world, Yuanjiang deposit is only economically viable one located China. More attempts are necessary to put constraints on ore-forming age of these deposits. Here, we dated rutile inclusions using LA-ICP-MS U–Pb method, yielded a lower intercept 206Pb/238U 20.2 ± 1.2 Ma Tera-Wasserburg plot, clo...