Results 21 to 30 of about 10,806 (258)

Tiny droplets of ocean island basalts unveil Earth’s deep chlorine cycle

Nature Communications, 2019
Volatile exchange between the Earth’s interior and surface layers is one of the central issues in mantle geochemistry. Here the authors present evidence that chlorine is transferred from the surface to the deep mantle by subducted oceanic crust, forming ...
Takeshi Hanyu, Kenji Shimizu, Takayuki Ushikubo, Jun-Ichi Kimura, Qing Chang, Morihisa Hamada, Motoo Ito, Hikaru Iwamori, Tsuyoshi Ishikawa   +8 more
doaj   +1 more source

Origin and Age of Magmatism in the Northern Philippine Sea Basins

Geochemistry, Geophysics, Geosystems, 2022
A Robust tectonic reconstruction of the Philippine Sea Plate around ∼52 Ma is a prerequisite in understanding the process of subduction initiation and establishment of the Izu‐Bonin‐Mariana arc.
Osamu Ishizuka, Kenichiro Tani, Rex N. Taylor, Susumu Umino, Izumi Sakamoto, Yuka Yokoyama, Gen Shimoda, Yumiko Harigane, Yasuhiko Ohara, Chris E. Conway, Americus Perez, Shun Sekimoto   +11 more
doaj   +1 more source

Deep Drilling into a Mantle Plume Volcano: The Hawaii Scientific Drilling Project [PDF]

Scientific Drilling, 2009
Oceanic volcanoes formed by mantle plumes, such as those of Hawaii and Iceland, strongly influence our views about the deep Earth (Morgan, 1971; Sleep, 2006).
Donald M. Thomas, Donald J. DePaolo, Edward M. Stolper   +2 more
doaj   +1 more source

Does depleted mantle form an intrinsic part of the Iceland plume? [PDF]

, 2003
Icelandic basalt ranges in composition from voluminous tholeiite, erupted in the rift zones, to small-volume, mildly alkaline basalt erupted off-axis.
Fitton, J. G., Hardarson, B. S., Kempton, P. D., Saunders, A. D.   +3 more
core   +1 more source

Sr-Nd-Pb-Hf isotope results from ODP Leg 187: Evidence for mantle dynamics of the Australian-Antarctic Discordance and origin of the Indian MORB source [PDF]

, 2002
New high precision PIMMS Hf and Pb isotope data for 14–28 Ma basalts recovered during ODP Leg 187 are compared with zero-age dredge samples from the Australian-Antarctic Discordance (AAD).
Barry, Tiffany Louise, Langmuir, C., Christie, D. M., David M. Christie, Barry, T. L., Pearce, J. A., Pamela D. Kempton, Pearce, Julian A., J. Godfrey Fitton, Tiffany L. Barry, Charles Langmuir, Langmuir, Charles, Julian A. Pearce, Kempton, Pamela D., Fitton, J. G., Kempton, P. D., Fitton, J. Godfrey, Christie, David M.   +17 more
core   +1 more source

Ta'u and Ofu/Olosega volcanoes: The “Twin Sisters” of Samoa, their P, T, X melting regime, and global implications

Geochemistry, Geophysics, Geosystems, 2014
The Samoan islands of Ta'u and Ofu/Olosega (Ofol hereafter) are single shield volcanoes that have erupted alkali basalt for the past 70 and 440 kyr, respectively.
Stanley R. Hart, Matthew G. Jackson
doaj   +1 more source

Channelized melt flow in downwelling mantle: Implications for 226Ra-210Pb disequilibria in arc magmas [PDF]

, 2008
We present the results of an analytical model of porous flow of viscous melt into a steadily dilating ‘‘channel’’ (defined as a cluster of smaller veins) in downwelling subarc mantle.
Koenders, M. A., Petford, Nick; id_orcid, Koenders, M.A., Petford, N., Turner, S, Petford, Nick, Turner, S., Koenders, M A   +7 more
core   +1 more source

The mantle isotopic printer: Basic mantle plume geochemistry for seismologists and geodynamicists [PDF]

, 2015
High-temperature geochemistry combined with igneous petrology is an essential tool to infer the conditions of magma generation and evolution in the Earth's interior. During the past thirty years, a large number of geochemical models of the Earth, essentially inferred from the isotopic composition of basaltic rocks, have been proposed. These geochemical
Lustrino M., Anderson D. L.
openaire   +4 more sources

Noble gases in the Cameroon line and the He, Ne, and Ar isotopic compositions of high mu (HIMU) mantle [PDF]

, 1999
Ultramafic xenoliths, basaltic lavas, and CO2 gases from the Cameroon line volcanic chain provide the first characterization of combined He, Ne, and Ar isotopes in a high-time-integrated 238U/204Pb = μ (HIMU) magmatic system. Helium isotopic compositions
Alex N. Halliday, Barfod, Dan N., Dan N. Barfod, Halliday, AN, J. Godfrey Fitton, Barfod, D. N., Ballentine, Chris J., Fitton, J. G., Halliday, Alex, Barfod, DN, Fitton, J. Godfrey, Ballentine, C. J., Halliday, A. N., Chris J. Ballentine, Fitton, JG, Ballentine, CJ, Halliday, Alex N.   +16 more
core   +1 more source

Multiple Sulfur Isotope Geochemistry of the Precambrian Mafic Dykes and Komatiites in the Dharwar Craton, Southern India: Evidence for Crustal Recycling and Enrichment in the Subcontinental Lithospheric Mantle

Lithosphere, 2022
Komatiites, greenstone volcanic rocks, and mafic dyke swarms are constituents of early earth magmatic activity, crucial for understanding the chemical evolution of the Archean mantle.
A. S. Silpa, M. Satish-Kumar
doaj   +1 more source