Now showing items 181-190 of 192
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 ...
Heat capacities of TiO2-bearing silicate liquids: Evidence for anomalous changes in configurational entropy with temperature
(Elsevier, 1993-07)
The heat capacities of several TiO2-bearing silicate glasses and liquids containing Cs2O, Rb2O, Na2O, K2O, CaO, MgO, or BaO have been measured to 1100 K using a differential scanning calorimeter and to 1800 K using a Setaram ...
A periclase-dolomite-calcite carbonatite from the Oka complex, Quebec, and its calculated volatile composition
(Springer-Verlag, 1984-02)
The eutectic mineral assemblage calcite-dolomite-periclase-apatite-forsterite-magnesioferrite-pyrrhotite-alabandite in a carbonatite dike within the Oka complex, Quebec, buffers the fugacities (and partial pressures) of ...
Lead isotopic composition of the oldest volcanic rocks of the eastern greater antilles island ARC
(Elsevier, 1987-03-20)
Pb isotopic analyses for rocks from the early Cretaceous Los Ranchos Formation, which is the basal volcanic assemblage in the Dominican Republic, fall on a short linear array of shallow slope in a 207Pb/204Pb vs. 206Pb/204Pb ...
A transmission electron microscope study of white mica crystallite size distribution in a mudstone to slate transitional sequence, North Wales, UK
(Springer-Verlag, 1990-12)
High-resolution transmission electron microscopy (HRTEM) measurements of the thickness of white mica crystallites were made on three pelite samples that represented a prograde transition from diagenetic mudstone though ...
13C/12C exchange between calcite and graphite: A possible thermometer in Grenville marbles
(Elsevier, 1981-03)
The fractionation of 13C between calcite and graphite, [Delta](Cc-Gr). is consistently small (2.6-4.8 permil) in 34 assemblages from upper amphibolite- and granulite-facies marbles of the Grenville Province. In 25 samples ...
The rhodium, silver and indium content of some chondritic meteorites
(Elsevier, 1960-01)
By neutron activation analysis the rhodium, silver and indium content of five chondritic meteorites has been determined. The average data are 0.186 and 0.094 p.p.m. for rhodium and silver. The upper limit for the indium ...
Akermanite in the Cascade Slide xenolith and its significance for regional metamorphism in the Adirondacks
(Springer-Verlag, 1980-06)
Akermanite (Ak 90 ) coexists with monticellite (Mo 92 ) and wollastonite (Wo 99 ) in an unusual calc-silicate xenolith in anorthosite at Cascade Slide in the Adirondack Mountains, New York. Experimental results bearing on ...