Isotope dating of rocks file profile
Most absolute dating techniques are based on radioactive decay. Discovery of radioactivity in 1896 finally provided the elusive "rock clock". Objective: To assign numerical ages geologic events. Tenn.; Sr-Nd isotopes of Apollo 17 basalts 1990-1992: Postdoc, USGS, Branch of Isotope Geology: Lower crustal nodules from Michigan kimberlites; High-precision U-Pb dating of Duluth Complex single zircons 1992-2010: USGS, Yucca Mtn. B., 1985, Carbonate alteration minerals in the Salton Sea geothermal system, California, USA. Project Branch: Site characterization studies (paleoseismicity, geomorphology, groundwater and vadose-zone hydrology, paleoclimate) focusing on U-series isotope approaches 2010-2014: USGS, Geosciences and Environmental Change Science Center: Various studies of climate change, landscape evolution, paleoseismicity, paleontology, and water sources/flow processes using U-series- and Sr-isotope data obtained from opaline silica, tufa, travertine, speleothems, bone, paleosols, peat, and water Research Geologist, USGS, Geology and Environmental Change Science Center, (2010 to 2014)Primary research responsibilities includes collection of radiogenic isotope data (U-series and Sr) used to date Quaternary deposits and provide natural tracers of mass flow through near-surface environments.
Analyses of relict orthopyroxene grains separated from a cumulate ultramafic rock indicate that δO values of the komatiite magmas were ~5.7.
This value is similar to that of modern ocean floor basalts and indicates that source mantle material of the Archaean komatiites had the same isotopic composition as mantle material from which modern ocean ridge basalts are derived.
Oxygen isotope compositions of secondary minerals (antigorite and chrysotile) are similar to those of serpentine minerals from modern altered oceanic rocks.
It is India's smallest state by area and the fourth smallest by population.
Goa has the highest GDP per capita among all Indian states, that is two and a half times that of the country. K., 1988, Age of native copper mineralization, Keweenaw Peninsula, Michigan.