[1] Mercury exhibits long-wavelength topography which has probably survived for 4 Ga. Assuming Airy compensation, the survival of the topography indicates that only certain combinations of crustal thickness and thermal structure are allowable. A dry diabase rheology allows a thicker crust than a dry plagioclase rheology. The existence of ancient faults places some constraints on the thermal str...

New geochronologic and paleomagnetic data from the North American Midcontinent Rift (MCR) reveal synchronous emplacement of Beaver River diabase, anorthosite xenoliths within it, Greenstone Flow—one largest lava flows on Earth. A U-Pb zircon date 1091.83 0.21 Ma (2) one is consistent with cumulate forming as part MCR provides a maximum age constraint for diabase. Paired minimum cross-cutting Si...

This paper presents a micromechanics-based elastoplastic damage model for quasi-brittle rocks in compression stress state. The plastic strain is considered to be related to frictional sliding along microcracks and inherently coupled with damage evolution. By following a homogenization procedure, we first determine the free energy for the matrix-cracks system. The thermodynamic force associated ...

The assumptions of conventional whole-rock and mineral isochron radioisotope dating were tested using a suite of radioisotopes from two Precambrian rocks. Amphibolite from the Beartooth Mountains of Wyoming shows evidence of thorough metamorphism by isochemical processes from andesite by an early Precambrian magma-intrusion event. A diabase sill, exposed within the wall of Grand Canyon at Bass ...

AIM OF DATABASE To monitor the development of diabetic eye disease in Denmark and to evaluate the accessibility and effectiveness of diabetic eye screening programs with focus on interregional variations. TARGET POPULATION The target population includes all patients diagnosed with diabetes. Denmark (5.5 million inhabitants) has ~320,000 diabetes patients with an annual increase of 27,000 newl...