Results 51 to 60 of about 157,575 (214)

U–Pb zircon ages from the Spontang Ophiolite, Ladakh Himalaya

Journal of the Geological Society, 2001
The Spontang Ophiolite in the Ladakh Himalaya consist of a thrust sheet of upper mantle and oceanic crustal rocks obducted onto the northern passive continental margin of India during the late Cretaceous. Precise isotopic ages of Himalayan ophiolites are presently unavailable. U–Pb dating of zircons from a dioritic segregation in the high-level gabbros
Pedersen, R, Searle, M, Corfield, R
openaire   +1 more source

A low U/Pb souce in the Moon: U-Th-Pb systematics of lunar meteorite Yamato-793169 [PDF]

, 1993
U-Th-Pb isotopic data were determined on mineral separates of the diabasic lunar meteorite, Yamato-793169,in order to define its age and characterize its magma source.
Misawa,Kenji, Tatsumoto,Mitsunobu, Torigoye,Noriko   +2 more
core   +1 more source

Geologic history of Martian regolith breccia Northwest Africa 7034: Evidence for hydrothermal activity and lithologic diversity in the Martian crust [PDF]

, 2016
The timing and mode of deposition for Martian regolith breccia Northwest Africa (NWA) 7034 were determined by combining petrography, shape analysis, and thermochronology.
Adcock, Agee, Andersen, Aström, Bacon, Bagnold, Beck, Bellucci, Bibring, Bibring, Bish, Blake, Blott, Borg, Bradley, Brandon, Cannon, Carr, Cartwright, Chipera, Christensen, Claoué-Long, Collinet, Cooney, Dahl, Day, Domokos, Domokos, Downs, Dreibus, Dyar, Ehlmann, Ehlmann, Farley, Filiberto, Filiberto, Filiberto, Filiberto, Foland, Friedman, Gattacceca, Gellert, Gellert, Goderis, Golden, Greeley, Greenwood, Grimes, Grotzinger, Hartmann, Haskin, Heaman, Herd, Hiess, Hiess, Humayun, Hurowitz, Jerolmack, Jutzeler, Kaminski, Kekäläinen, Keller, Klingelhofer, Lee, Leroux, Liu, Lorand, Ludwig, Ludwig, Malin, Manga, Mattinson, McCanta, McCubbin, McCubbin, McCubbin, McCubbin, McCubbin, McEwen, McKay, McLennan, McLennan, McLennan, McLennan, McSween, McSween, McSween, McSween, McSween, McSween, Medard, Meldrum, Mezger, Monders, Monkawa, Morris, Morris, Moser, Murchie, Musselwhite, Muttik, Nekvasil, Nekvasil, Nemchin, Nyquist, Nyquist, Papike, Papike, Poulet, Santos, Sarbadhikari, Sautter, Sautter, Schmidt, Schmidt, Schoene, Schon, Sha, Sharp, Shearer, Shearer, Squyres, Squyres, Squyres, Stacey, Steele, Stolper, Szabó, Tartèse, Taylor, Taylor, Taylor, Terada, Terada, Thomson, Tosca, Treiman, Tuff, Udry, Usui, Vaniman, Vaniman, Wadhwa, Walker, Wang, Wang, Wiedenbeck, Wiedenbeck, Williams, Wingate, Wittmann, Yen   +151 more
core   +3 more sources

Late Cretaceous to Paleocene Metamorphism and Magmatism in the Funeral Mountains Metamorphic Core Complex, Death Valley, California [PDF]

, 2007
Amphibolite-facies Proterozoic metasedimentary rocks below the low-angle Cenozoic Boundary Canyon Detachment record deep crustal processes related to Mesozoic crustal thickening and subsequent extension.
Colgan, Joseph P., Mattinson, Chris G., Metcalf, James R., Miller, Elizabeth L., Wooden, Joseph L.   +4 more
core   +2 more sources

U-Pb age of the Diana Complex and Adirondack granulite petrogenesis

Journal of Earth System Science, 2001
U-Pb isotopic analyses of eight single and multi-grain zircon fractions separated from a syenite of the Diana Complex of the Adirondack Mountains do not define a single linear array, but a scatter along a chord that intersects the Concordia curve at 1145 ± 29 and 285 ± 204 Ma. For the most concordant analyses, the207Pb/206Pb ages range between 1115 and
Asish R. Basu, Wayne R. Premo
openaire   +2 more sources

Thermochronology of the modern Indus River bedload: New insight into the controls on the marine stratigraphic record [PDF]

, 2004
The Indus River is the only major drainage in the western Himalaya and delivers a long geological record of continental erosion to the Arabian Sea, which may be deciphered and used to reconstruct orogenic growth if the modern bedload can be related to ...
Ali Athar Khan, Anczkiewicz, Andrew Carter, Ballard, Black, Brookfield, Carpena, Carter, Carter, Charlotte M. Allen, Cherniak, Clift, Clift, Clift, Compston, Copeland, Copeland, Corrigan, Cumming, DeCelles, Dunlap, Finlayson, Fontan, Foster, Fraser, Galy, Garzanti, Garzanti, George, Green, Guillot, Harrison, Hirata, Hodges, Hodges, Hodges, Honegger, Horn, Hubbard, Ian H. Campbell, Jain, Kip V. Hodges, Koppers, Krol, Krol, Kumar, Lee, Malcolm S. Pringle, Maluski, Metcalfe, Molnar, Moore, Najman, Najman, Noble, Parrish, Parrish, Pearce, Peter D. Clift, Poupeau, Renne, Rowley, Schärer, Schärer, Searle, Searle, Searle, Searle, Searle, Searle, Sorkhabi, Sorkhabi, Stephenson, Stüwe, Stüwe, Treloar, Treloar, Vannay, Villa, Walker, Weinberg, White, Winslow, Xifan Zhang, Zeilinger, Zeitler, Zeitler, Zeitler, Zeitler, Zeitler, Zhang   +90 more
core   +2 more sources

U-Pb Ages of Lunar Apatites [PDF]

, 2006
Apatite is one of the minerals that is rarely utilized in U-Pb geochronology, compared to some other U-rich accessory phases. Relatively low U concentration, commonly high proportion of common Pb and low closure temperature of U-Pb system of apatite ...
Meyer, Charles, Nemchin, A. A., Pidgeon, R. T., Vaughan, J.   +3 more
core   +1 more source

Columbite-Group Minerals from New York Pegmatites: Insights from Isotopic and Geochemical Analyses

Geosciences, 2018
Columbite crystals from niobium-yttrium-fluorine (NYF) pegmatites lacking zircon or containing metamict cyrtolite were analyzed for major and minor elements (Electron Microprobe (EMP)), trace elements (Laser Ablation-Inductively Coupled Plasma-Mass ...
Marian V. Lupulescu, Jeffrey R. Chiarenzelli, Mark E. Pecha, Jared W. Singer, Sean P. Regan   +4 more
doaj   +1 more source

A new appraisal of Sri Lankan BB zircon as a reference material for LA-ICP-MS U-Pb geochronology and Lu-Hf isotope tracing [PDF]

, 2017
A potential zircon reference material (BB zircon) for laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb geochronology and Hf isotope geochemistry is described.
Batumike, Black, Black, Cavosie, Chakoumakos, Cherniak, Cherniak, Crowley, Dewaele, Dharmapriya, Dissanayake, Dissanayake, Gehrels, Gonçalves, Griffin, Gulson, Hoskin, Hu, Hölzl, Jackson, Jaffey, Jochum, Kinny, Kröner, Kröner, Kröner, Li, Mattinson, Morel, Murakami, Nasdala, Nasdala, Nasdala, Pidgeon, Sajeev, Santosh, Schmitz, Schoene, Sláma, Speer, Stern, Taylor, Valley, Wiedenbeck, Wiedenbeck, Woodhead, Woodhead, Xu, ZhiChao   +48 more
core   +1 more source

Age Determination of Gem-Quality Green Vanadium Grossular (Var. Tsavorite) from the Neoproterozoic Metamorphic Mozambique Belt, Kenya and Tanzania

Crystals
Gem-quality garnets, with their high closure temperature (750–800 °C), high transparency, uniform composition, and purity, offer promising prospects for U-Pb dating.
Siyi Zhao, Bo Xu, Yi Zhao
doaj   +1 more source