Results 51 to 60 of about 784,658 (343)

Rifting and arc-related early Paleozoic volcanism along the North Gondwana margin: geochemical and geological evidence from Sardinia (Italy) [PDF]

, 2012
Three series of volcanic rocks accumulated during the Cambrian to Silurian in the metasediment-dominated Variscan basement of Sardinia. They provide a record of the changing geodynamic setting of the North Gondwana margin between Upper Cambrian and ...
BUZZI L, FUNEDDA A., GAGGERO L, OGGIANO G   +3 more
core   +1 more source

Neoarchean Arc Magmatism and Crust Recycling in the Northern Marginal Zone of the Limpopo Complex, Zimbabwe: New Insights From Zircon U‐Pb‐Hf Isotopes of a Charnockite Suite

Geological Journal, EarlyView.
Charnockites with 2691–2607 Ma magmatic ages from the NMZ show arc‐magmatic geochemical signatures. They correspond to the lower‐crustal equivalent of the Chilimanzi Suite Granite in the Zimbabwe Craton. Lu‐Hf isotopic data of magmatic zircons show negative εHf(t) values (−11.18 to −2.20) with TDMC ages of 3699–3158 Ma, suggesting their protolith ...
Toshiaki Tsunogae, Md. Sazzadur Rahman, Gao Pin, M. Santosh, Wataru Fujisaki, Sam Uthup, Prince Mandingaisa   +6 more
wiley   +1 more source

Karakteristik Unsur Jejak Dalam Diskriminasi Magmatisme Granitoid Pulau Bangka [PDF]

Eksplorium: Buletin Pusat Pengembangan Bahan Galian Nuklir, 2015
Geology of Bangka Island consists by variation of granite as Klabat Granitoid scattered in various locations. Trace elements can be applied in magmatism discrimination of granitoid.The purpose of this study was to determine the characteristics Bangka ...
Kurnia Setiawan Widana, Bambang Priadi
doaj   +1 more source

High‐Titanium Zircon Rims in Rhyolite – A Reflection of Adiabatic Ascent?

Geological Journal, EarlyView.
The ascent of granitic magma from source to emplacement is rapidly achieved through dyking, resulting in negligible heat loss to the surrounding wallrock (i.e., adiabatic). Zircon growth during ascent can record the changing magma conditions including adiabatic cooling and heating, resulting in high titanium rims on low titanium cores without ...
Carson Kinney, Holden Little, Chris Yakymchuk   +2 more
wiley   +1 more source

Mineralogical evolution of the northern Bossoroca ophiolite, São Gabriel terrane

Brazilian Journal of Geology, 2020
Mineralogical evolution of ophiolites is significant to understand paleo-oceanic crust and mantle requiring multi-proxy techniques to identify steps in the processes. We studied the Bossoroca ophiolite from the southern Brasiliano Orogen, a prime example
Amanda Juliano Massuda, Léo Afraneo Hartmann, Gláucia Nascimento Queiroga, Marco Paulo de Castro, Carolina Gonçalves Leandro, Jairo Francisco Savian   +5 more
doaj   +1 more source

Continental Margin Ophiolites of Neotethys: Remnants of Ancient Ocean-Continent Transition Zone (OCTZ) Lithosphere and their Geochemistry, Mantle Sources and Melt Evolution Patterns

, 2015
We present an overview of the geology , eochemistry and petrogenesis of continental mar gin ophiolites (CMO), which represent the lithospheric remnants of riftgenerated paleo ocean – continent transition zones (OCTZ) in orogenic belts.
E. Saccani, Y. Dilek, M. Marroni, L. Pandolfi   +3 more
semanticscholar   +1 more source

Origins of the Pangkaimen Au Deposit in the Northern Great Xing'an Range, China: Evidence From Geochronological, Geochemical, Fluid Inclusion, and H–O–S–Pb Isotope Data

Geological Journal, EarlyView.
The Pangkaimen Au–Ag deposits belong to the epithermal Au deposits, which are of great significance for guiding the research and development of this type of gold deposit. Metallogenic model diagram of Pangkaimen Au–Ag deposit. ABSTRACT The gold (Au) metallogenic belt in the northern Great Xing'an Range is characterised by the wide occurrence of the ...
Sheng Lu, Hongpeng Chen, Chenglu Li, Ye Wang, Tiesheng Li, Rigen Wu, Zengtao Li, Zhichao Song, Xiannan Zhu   +8 more
wiley   +1 more source

Subducted Carbon From Mantle Plume in Mid‐Ocean Ridge Basalts

Geophysical Research Letters
Deciphering the Earth's deep carbon cycle, from mantle plumes to mid‐ocean ridges, remains incompletely understood. In this study, we analyze the magnesium isotope composition of basalts collected from the South Mid‐Atlantic Ridge (SMAR), which have been
Haitao Zhang, Quanshu Yan, Xuefa Shi, Chuanshun Li, Fang Huang, Qiuyu Wen   +5 more
doaj   +1 more source

Frontiers in earth sciences: new ideas and interpretation

Annals of Geophysics, 2006
A one-day symposium on new and conventional ideas in plate tectonics and Mediterranean geodynamics was held in Rome on February 19, 2003 at the headquarters of INGV. There were two main reasons for such an initiative.
G. Scalera, G. Lavecchia
doaj   +1 more source

Early Cenozoic denudation of central west Britain in response to transient and permanent uplift above a mantle plume [PDF]

, 2018
Upwelling mantle plumes beneath continental crust are predicted to produce difficult to quantify, modest uplift and denudation. The contribution of permanent and transient components to the uplift is also difficult to distinguish.
Al-Kindi, Arrowsmith, Bamford, Barnett-Moore, Beucher, Bluck, Blundell, Bott, Bott, Bott, Braun, Braun, Braun, Brown, Brown, Brown, Brown, Brown, C. Persano, Chadwick, Cogné, Cogné, Cope, Cox, Croudace, Davis, Dobson, Downing, F. M. Stuart, Farley, Flowers, Gallagher, Ganerød, Gautheron, Gautheron, Gautheron, Gautheron, Gleadow, Green, Green, Green, Green, Green, Guenthner, Hancock, Hancock, Haq, Hartley, Hillis, Holford, Holliday, Jackson, Japsen, Jones, Jones, K. Łuszczak, Ketcham, Lewis, Lister, Liu, Lundin, Mackay, Maclennan, McDowell, Meesters, Montgomery, Moucha, Mudge, Murray, Nadin, Persano, Persano, Petersen, Rowley, Rudge, Rundle, Saunders, Shaw Champion, Shennan, Simms, Simms, Stephenson, Stoker, Stuart, Tiley, Tiley, Tomlinson, Vernon, Ware, Westaway, Westaway, Westaway, White, White, White, Williamson, Ziegler, Ziegler, Łuszczak   +98 more
core   +1 more source