Most rare earth element deposits form from magmatic fluids, but there have also been discoveries of heavy rare earth element (HREE)– enriched hydrothermal xenotime deposits within sedimentary basins. As xenotime is notoriously insoluble, the question arises as to whether these lesser-known deposits form at typical basin temperatures or by influx of much hotter magmatic-hydrothermal fluids. The ...

The Great Unconformity is a widely distributed surface separating Precambrian rocks from overlying Phanerozoic sedimentary sequences. causes and implications of this feature, whether it represents singular global event, are much debated. Here, we present new apatite (U-Th)/He (AHe) thermochronologic data the central Canadian Shield that constrain when basement last cooled to near-surface temper...

Unconformity and distrust are the results of sociopolitical attempt aimed to socially economically evolve under Top-Down system, finding that “there is no hell like a small town,” Colombian expression meaning despite size social group, its problems could be as big those metropolis. Aipe one Huila’s municipalities benefited from oil bonanza, inversely proportional social, economic, environmental...

Unconformity-related uranium deposits in the Athabasca Basin, Canada, include highest grade, large tonnage world. Recent studies of Patterson Lake corridor suggest a deep heat source enhances hydrothermal fluid flow and incursion basinal brines along brittlely reactivated ductile shear zones. However, spatial extent ore systems lower crustal features capable driving cells remained largely unres...

The Sundaland continental promontory, as the core of Southeast Asia, is one of the lowest lying continental regions, with half of the continental area presently inundated by a shallow sea. The role of mantle convection in driving long-wavelength topography and vertical motion of the lithosphere in this region has often been ignored when interpreting regional stratigraphy, including a widespread...

Phyllite and quartzite, probably Precambrian, trend meridionally and dip steeply in the New River Gorge above the junction with the Salisbury River in southern Tasmania. Further upstream an association of silty dolomite and conglomerate is less deformed and may be younger. Siliceous conglomerate boulders occur in the New River below the gorge. Late Ordovician carbonates of the Gordon Group are ...

The Idaho Transportation Department (ITD) commissioned a geophysical study to aid in the design of a replacement for an existing concrete span bridge. Because the river current was too swift to place geophones in the river, the solution was to shoot p-wave profiles in a reciprocal geometry (phones on land, shots in the river). In addition to the refraction work, a down-hole seismic profile was ...

Salina Canyon, Utah, reveals a spectacular angular unconformity along an east-west transect through the southern part of Wasatch Plateau. This region Utah is well known as eastern extent Sevier orogenesis, but it also includes subsequent extensional overprinting. Earliest descriptions this were published by Dutton (1880) and Spieker (1946, 1949), work continues today. Field relationships expose...