Now showing items 291-300 of 307
Anomalous thermal maturities caused by carbonaceous sediments
(Blackwell Publishing Ltd, 1994-03)
Sedimentary rocks such as coal and carbonaceous mudstone which contain abundant carbonaceous matter are characterized by thermal conductivity much lower than that exhibited by other common rock types, by a factor of 5–10. ...
The Aurora volcanic field, California-Nevada: oxygen fugacity constraints on the development of andesitic magma
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1996-10)
The Aurora volcanic field, located along the northeastern margin of Mono Lake in the Western Great Basin, has erupted a diverse suite of high-K and shoshonitic lava types, with 48 to 76 wt% SiO 2 , over the last 3.6 million ...
Sr/Ca and Mg/Ca ratios in polygenetic carbonate allochems from a Michigan marl lake
(Elsevier, 1981-03)
Rapid accumulation of CaCO3 is occurring in Littlefield Lake, a marl lake located in central Michigan. The sediment, which is 95% CaCO3, primarily consists of eight different genetic groups of carbonate allochems. These ...
Can differences in heat flow between east and southern Africa be easily interpreted?: Implications for understanding regional variability in continental heat flow
(Elsevier, 1993-03-31)
We address the extent to which regional variations in continental heat flow can be interpreted, making use of a heat flow data set from east and southern Africa. The first-order observation deriving from these heat flow ...
Early island-arc intrusive activity, Cordillera Central, Dominican Republic
(Springer-Verlag, 1977-11)
Reconnaissance studies of early island-arc intrusions in the Cordillera Central of the Dominican Republic demonstrate that these rocks are mainly hornblende tonalite with lesser amounts of hornblende diorite, quartz diorite, ...
Magmatic modification of the uppermost mantle beneath the Basin and Range to Colorado Plateau Transition Zone; Evidence from xenoliths, Wikieup, Arizona
(Springer-Verlag; Springer-Verlag Berlin Heidelberg, 1997-06)
Upper mantle xenoliths from Wikieup, AZ, provide abundant evidence for magmatic modification of the uppermost mantle beneath the Transition Zone between the Colorado Plateau and the southern Basin and Range province. Upper ...