The phyllic alteration in a number of circum-Pacific porphyry Cu-Au deposits is related to high-temperature saline magmatic fluids. This contradicts the widely used genetic models wherein phyllic alteration formed as the result of mixing between magmatic and meteoric fluids. At the Endeavour 26 North porphyry deposit in eastern Australia, the transition from early potassic to the main-stage phy...

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 ...

Fifteen volumes long, Against the Christians was written by the Roman pagan Porphyry circa 280 and was an educated man's studied attack on Christian theology. An exceedingly powerful and successful work, it and commentaries on it were condemned by the imperial church in 448 and burned. Only remnants which were contained in books that were primarily about other matters have survived until the pr...

Porphyry Cu and epithermal deposits are spatially and temporally related to specific volcanic and plutonic rocks emplaced during the formation of long-lived magmatic arcs formed along convergent plate boundaries (e.g., Sillitoe, 1972; Sutherland Brown, 1976; Titley, 1982; Sawkins, 1990; Bissig et al., 2003). Recognizing the presence, types of deposits, and age of the mineralized volcanoplutonic...

Hepatic porphyries have been associated with an increased risk of primary liver cancer (PLC), which on the other hand may cause an increased porphyrin production. To evaluate the role of an underlying liver disorder we analyzed porphyrins in patients with hepatocellular carcinoma (HCC) (n = 65), cholangiocellular carcinoma (n = 3), or suspected PLC, which turned out to be metastases (n = 18) or...