Results 71 to 80 of about 782,637 (367)

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

Polluted White Dwarfs: Constraints on the Origin and Geology of Exoplanetary Material [PDF]

Monthly Notices of the Royal Astronomical Society, Volume 479, Issue 3, 21 September 2018, Pages 3814-3841, 2018
White dwarfs that have accreted rocky planetary bodies provide unique insights regarding the bulk composition of exoplanetary material. The analysis presented here uses observed white dwarf atmospheric abundances to constrain both where in the planetary system the pollutant bodies originated, and the geological and collisional history of the pollutant ...
arxiv   +1 more source

First discovery of highly fractionated tourmaline-bearing leucogranite-pegmatite in Duxiushan, Anqing ore-cluster region, middle and lower Yangtze metallogenic belt: A clue to strategic metal exploration

Solid Earth Sciences, 2022
A suite of highly fractionated granites and associated pegmatite, were revealed through drill hole in the Anqing ore-cluster region in the Lower Yangtze River Belt (MLRB), Eastern China, for the first time. The pegmatite has abundant tourmaline.
Zhuang Zhao, Xiaoyong Yang, Beicai Zhang, Dongqing Wang, Jiancheng Xie, Tuyan Zhang, Wanying Li   +6 more
doaj  

Mantle structural geology from seismic anisotropy [PDF]

, 1999
International audience; Seismic anisotropy is a ubiquitous feature of the subcontinental mantle. This can be inferred both from direct seismic observations of shear wave splitting from teleseismic shear waves, as well as the petrofabric analyses of mantle nodules from kimberlite pipes.
Silver, Paul, Mainprice, David, Ismaïl, Walid, Tommasi, Andrea, Barruol, Guilhem   +4 more
openaire   +1 more source

Two-sided asymmetric subduction; implications for tectonomagmatic and metallogenic evolution of the Lut Block, Eastern Iran [PDF]

, 2011
West directed subduction zones show common characteristics, such as low structural elevation, deep trench, steep slab and a conjugate back-arc basin that are opposite to those of the east directed subduction zones.
Arjmandzadeh, R., Homam, S. M., Karimpour, M. H., Mazaheri, S. A., Medina, J. M., Santos, J. F.   +5 more
core   +2 more sources

The Hudson Bay Lithospheric Experiment (HuBLE) : Insights into Precambrian Plate Tectonics and the Development of Mantle Keels [PDF]

, 2015
The UK component of HuBLE was supported by Natural Environment Research Council (NERC) grant NE/F007337/1, with financial and logistical support from the Geological Survey of Canada, Canada–Nunavut Geoscience Office, SEIS-UK (the seismic node of NERC ...
Bastow, I. D., Darbyshire, F. A., Eaton, D. W., Helffrich, G., Kendall, J.-M., Pawlak, A. E., Snyder, D. B., Thompson, D. A., Wookey, J.   +8 more
core   +2 more sources

Application of 3D Raman Mapping on Complex Inclusions: A Case Study of the Styrian Basin Mantle Xenoliths (W‐Carpathian Pannonian Region)

Journal of Raman Spectroscopy, EarlyView.
Recent advancements in spectral and spatial resolutions for Raman spectroscopy allow the analysis of fluid and melt inclusions. To explore the applicability of 3D Raman mapping, we conducted 3D Raman mapping on inclusions hosted by orthopyroxene in modally metasomatized mantle xenoliths from the Styrian Basin (W‐Carpathian Pannonian Region).
Justine L. Myovela, László E. Aradi, Tamás Spránitz, Zoltán Taracsák, Máté Hegedűs, Patrik Konečný, János Kovács, Márta Berkesi   +7 more
wiley   +1 more source

Occurrence of niobium in biotite-type Fe-REE-Nb ore in the Bayan Obo deposit

Solid Earth Sciences, 2023
The Bayan Obo REE-Nb-Fe deposit, which reserves the current largest REE resources globally, also hosts 63.4% of China's Nb resources. Previous studies mainly focus on the isotopes and petrographic mineralogy of carbonatite dyke, ore-host dolomite and ...
Yisu Ren, Xiaoyong Yang, Xiaoxia Wang
doaj  

Gravity inversion of deep-crust and mantle interfaces in the Three Gorges area

Geodesy and Geodynamics, 2012
To better understand the heterogeneity of deep-crust and mantle interfaces in the region of the Three Gorges, China, we used the Parker-Oldenburg iterative inversion method to invert existing Bouguer gravity data from the Three Gorges area (1 : 500000 ...
Wang Jian, Shen Chongyang, Ii Hui, Sun Shaoan, Xing Lelin   +4 more
doaj   +1 more source

Isotopic composition of lead from dikes and ores of the Vorontsovkoe gold deposit (Northern Urals)

Литосфера, 2020
Research subject. The Vorontsovskoe deposit belongs to gold deposits, in which gold is disseminated finely across carbonate-terrigenous rocks (Carlin-type). This study was aimed at identifying the sources of lead in various ore types (in skarn, jasperoid,
V. V. Murzin, I. V. Vikentyev, O. B. Azovskova, M. Yu. Rovnushkin, M. V. Streletskaya, V. I. Blokov, O. V. Vikent’eva   +6 more
doaj   +1 more source