Results 91 to 100 of about 25,858 (276)

Resolving Crustal and Subcrustal Dynamic Sources in Continental Arc Magmas: The Cenozoic Andean Arc of Central Chile

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract The Andean margin of Central Chile (∼32°40′–34°30′S) records abundant Cenozoic arc magmatic activity with variable compositional characteristics. This is examined through the analysis of an extensive database of new and published whole‐rock geochemistry and Sr‐Nd isotopic compositions, in addition to zircon Hf and O isotopic compositions.
M. Muñoz‐Gómez, C. M. Fanning, F. Tapia, I. Payacán, F. Fuentes, M. Farías, R. Charrier, M. Polvé, S. Quiñones, K. Deckart, A. Fock   +10 more
wiley   +1 more source

Petrology and Geochemistry of Igneous Rocks in Gunung Badak Complex, Ciletuh Palabuhanratu Geopark, Sukabumi, West Java

Aceh International Journal of Science and Technology
Gunung Badak Complex is located in Ciletuh Palabuhanratu UNESCO Global Geopark, which preserves significant records of tectonic evolution in Southern West Java. This research aims to characterize igneous rocks and interpret tectonic implications.
Millati Amalia Sentosa*, Mega Fatimah Rosana, Cipta Endyana   +2 more
doaj   +1 more source

Transfer of Strontium and Carbon From Subducting Sediment Into the Leading Edge of the Mantle Wedge

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Carbon mobilization at subduction zones can be constrained by focusing on Sr as a proxy, as Sr readily substitutes for Ca—a major cation in the crystal structures of carbonates. Unmelted high/ultrahigh pressure (HP/UHP) pelitic metasediments exhumed from less than 100 km depth along the slab‐mantle interface show loss of Sr and retention of ...
Amol Dayanand Sawant, Peter B. Kelemen, Matthew Jerram, Martin Q. Fleisher, Louise Bolge, Juan Carlos de Obeso, Diego Fernandez   +6 more
wiley   +1 more source

Variable Upper Mantle Geochemical Processes Constrained From Independent Component Analysis of the Fizh Massif, Northern Oman Ophiolite

Geochemistry, Geophysics, Geosystems
We statistically analyzed the whole‐rock compositions of peridotites in the Oman ophiolite using a multivariate statistical technique called independent component analysis (ICA) to better understand the processes within the ophiolitic mantle section that
Yuto Miki, Eiichi Takazawa, Kenta Ueki, Tatsu Kuwatani   +3 more
doaj   +1 more source

Mantle melting as a function of water content beneath back-arc basins [PDF]

, 2006
Subduction zone magmas are characterized by high concentrations of H_(2)O, presumably derived from the subducted plate and ultimately responsible for melting at this tectonic setting.
Grove, Timothy L., Hauri, Erik, Kelley, Katherine A., Newman, Sally, Plank, Terry, Stolper, Edward M.   +5 more
core   +1 more source

Multi‐Stage Crustal Thickening, Surface Uplift, and Collision in the Western Himalaya‐Karakoram‐Tibet Orogen Revealed by Chemical Mohometry

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract The Himalaya‐Karakoram‐Tibet (HKT) orogen provides an unrivaled opportunity to study the dynamic linkages between deep and surface processes during collisional orogenesis. However, these efforts are hindered by conflicting interpretations on the number and timing of collisional events, and the timing of crustal thickening and associated ...
Ian W. Hillenbrand, Victor E. Guevara
wiley   +1 more source

Prebiotic Organic Microstructures [PDF]

, 2011
Micro- and sub-micrometer spheres, tubules and fiber-filament soft structures have been synthesized in our experiments conducted with 3 MeV proton irradiations of a mixture of simple inorganic constituents, CO, N2 and H2O.
A Yoshihara, AM Hessler, CJ Hale, DI Foustoukos, F Klein, H Kurihara, J Takahashi, K Kobayashi, K Kobayashi, K Kobayashi, K Kobayashi, K Kvenvolden, Kensei Kobayashi, M Yoshizaki, Marie-Paule Bassez, MP Bassez, MP Bassez, O Botta, S Miyakawa, SL Seewald, T McCollom, T McCollom, Y Takano, Y Takano, Y Takano, Y Takano, Yoshinori Takano   +26 more
core   +2 more sources

Uranium Addition and Loss in Serpentinites: The Potential Role of Iron Oxides

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Fluid‐mobile uranium serves as a tracer for water‐rock alteration in serpentinized mantle rocks, which constitute an important uranium reservoir. However, the mechanism for uranium addition, where uranium is hosted, and the stability of the uranium enriched material during subduction is not settled.
Emily H. G. Cooperdock, Juan Carlos de Obeso, Frank J. Pavia   +2 more
wiley   +1 more source

Disentangling Partial Melting and Crustal Recycling Signatures in Ocean Island Basalts With Multivariate Statistics

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 9, September 2025.
Abstract Ocean island basalts (OIB) provide valuable constraints on mass exchange between the mantle and crust. When appropriate compositional data transformations are applied, multivariate analyses of OIB compositions can be used to infer mantle source heterogeneity and elucidate its driving processes.
Zachary T. Eriksen, Andreas Stracke
wiley   +1 more source

Origins of chemical diversity of back-arc basin basalts: a segment-scale study of the Eastern Lau Spreading Center [PDF]

, 2009
We report major, trace, and volatile element data on basaltic glasses from the northernmost segment of the Eastern Lau Spreading Center (ELSC1) in the Lau back-arc basin to further test and constrain models of back-arc volcanism.
Asimow, Paul D., Bézos, Antoine, Escrig, Stéphane, Langmuir, Charles H., Michael, Peter J.   +4 more
core   +2 more sources