Results 91 to 100 of about 15,904 (206)

The Oxidation State of Sulfur in Lunar Apatite [PDF]

Lunar apatites contain hundreds to thousands of parts per million of sulfur. This is puzzling because lunar basalts are thought to form in low oxygen fugacity (f(sub O2)) conditions where sulfur can only exist in its reduced form (S2()), a substitution ...
Boyce, Jeremy, Brounce, Maryjo, Humphreys, Jennifer, McCubbin, Francis M., Reppart, Justin, Stolper, Edward   +5 more
core   +1 more source

Thermomagnetic analysis of meterorites. 4: Ureilites [PDF]

Samples of all available ureilites have been analyzed thermomagnetically. For three of the six (Dyalpur, Goalpara and Havero) evidence was found for only low-nickel metallic-iron as the magnetic component and the (saturation magnetization vs, temperature)
Herndon, J. M., Larson, E. E., Rowe, M. W., Watson, D. E.   +3 more
core   +1 more source

Magnetic susceptibility of Variscan granite-types of the Spanish Central System and the redox state of magma

Geologica Acta, 2017
Magnetic susceptibility (MS) has been measured in Variscan granites from central Spain. They yield values in the order of 15 to 180μSI units for S- and I-type granites, indicating that both types belong to the ilmenite series.
C. VILLASECA, V.C. RUIZ-MARTÍNEZ, C. PÉREZ-SOBA   +2 more
doaj  

The Mineralogy, Geochemistry, and Redox State of Multivalent Cations During the Crystallization of Primitive Shergottitic Liquids at Various (f)O2. Insights into the (f)O2 Fugacity of the Martian Mantle and Crustal Influences on Redox Conditions of Martian Magmas. [PDF]

The (f)O2 [oxygen fugacity] of crystallization for martian basalts has been estimated in various studies to range from IW-1 to QFM+4 [1-3]. A striking geochemical feature of the shergottites is the large range in initial Sr isotopic ratios and initial ...
Bell, A. S., Burger, P. V., Jones, J., Le, L., Muttik, N., Papike, J. J., Shearer, C. K.   +6 more
core   +1 more source

A screening method for ranking chemicals by their fate and behaviour in the environment and potential toxic effects in humans following non-occupational exposure [PDF]

, 2004
A large number of chemicals are released intentionally or unintentionally into the environment each year. These include thousands of substances that are currently listed worldwide and several hundred new substances added annually (Mücke et al., 1986 ...
Capelton, A, Duarte-Davidson, R, Troisi, G   +2 more
core  

Microprobe and oxygen fugacity study of armalcolite [PDF]

The stability of synthetic armalcolite was determined as a function of oxygen fugacity with particular regard to the oxidation state of iron and titanium.
Friel, J. J.
core   +1 more source

Volatiles and Redox Along the East African Rift

Geochemistry, Geophysics, Geosystems
The upper mantle under the Afar Depression in the East African Rift displays some of the slowest seismic wave speeds observed globally. Despite the extreme nature of the geophysical anomaly, lavas that erupted along the East African Rift record modest ...
Maryjo Brounce, Sara Scoggins, Tobias P. Fischer, Heather Ford, Joseph Byrnes   +4 more
doaj   +1 more source

Geochemical indicators for cobalt-rich skarn exploration: constraints from the Pusangguo granodiorite (Gangdese) on geochemistry, zircon U-Pb geochronology and Hf-Nd-Sr isotopes

Frontiers in Earth Science
The Pusangguo skarn-type copper-polymetallic deposit in the Gangdese metallogenic belt hosts economic cobalt mineralization. An integrated study of petrography, zircon U-Pb geochronology, whole-rock geochemistry, and Sr–Nd–Hf isotopes indicates the ore ...
Zhaxi Pubu, Qiong Ci, Fuzhi Gong, Nan Chao   +3 more
doaj   +1 more source

Geological characteristics of neoproterozoic motianling granitic pluton hosting uranium mineralization in North Guangxi, China: Insights from biotite chemistry

Frontiers in Earth Science
The Motianling pluton represents a characteristic U-bearing granite pluton in South China. Biotite serves as an indicator for the mineralization of metals such as Cu, Sn, and W in granite. Previous studies have extensively investigated the U metallogenic
Pailong Luo, Pailong Luo, Chunying Guo, Chunying Guo, Chunying Guo, Qiaohui Pi, Qiaohui Pi, Ning Wang, Ning Wang, Naiyuan Liu, Naiyuan Liu, Naiyuan Liu   +11 more
doaj   +1 more source

The Moho as a magnetic boundary [PDF]

Magnetic data are presented for mantle derived rocks: peridtites from St. Pauls rocks, dunite xenoliths from the kaupulehu flow in Hawaii, as well as peridolite, dunite and eclogite xenoliths from Roberts Victor, Dutoitspan, Kilbourne Hole, and San ...
Mayhew, M. A., Thomas, H. H., Wasilewski, P. J.   +2 more
core   +1 more source