Results 61 to 70 of about 3,014 (216)

Amphibole's Influence on Mid‐Lithosphere Discontinuity: Insights From Electrical Conductivity

Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.
Abstract The potential role of metasomatism‐induced hydrated layers, such as amphibole, in causing the mid‐lithospheric discontinuities (MLDs) has been widely debated. To determine whether amphibole is the compositional cause of the MLDs, we measured the electrical conductivity of mixtures of olivine and various proportions of amphiboles under high ...
Kewei Shen, Duojun Wang, Rui Zhang, Guangchao Chen, Kenan Han, Peng Chen, Ruixin Zhang, Zhiqing Zhang   +7 more
wiley   +1 more source

The Lages diatremes: mineral composition and petrological implications

Anais da Academia Brasileira de Ciências, 2007
Chemical data of heavy minerals from Lages diatremes in southern Brazil have been studied with the aim of characterizing the sample source(s). Three groups of minerals are recognized: I) aluminian-chromian pyroxene, pyrope garnet and chromian spinel ...
Giancarlo Barabino, Celso B. Gomes, Gianbosco Traversa   +2 more
doaj   +1 more source

Petrology and Geochemistry of Ophiolitic Pyroxenite in the Eastern Desert of Egypt: Genesis of Ultramafic Cumulates and Implications for Neoproterozoic Supra‐Subduction Seafloor Metamorphism

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 3, March 2025.
Abstract We describe and compare two outcrops of pyroxenite associated with Neoproterozoic ophiolite sequences in the Eastern Desert of Egypt: small masses in the Abu Samuki area of the North Eastern Desert and large belts in the Wadi El‐Mireiwa area of the South Eastern Desert.
Hussam A. Selim, Paul D. Asimow, Ayman E. Maurice, Mohamad A. Ismail, Oliver D. Wilner, Nathan F. Dalleska, Moustafa E. Gharib, Safinaz A. A. Mahmoud   +7 more
wiley   +1 more source

The problems of zeolites detection and their influence on development of the productive reservoirs in the Messoyakha group of fields

Известия Томского политехнического университета: Инжиниринг георесурсов, 2019
It is found out that zeolites are formed in alkaline environment at diagenesis or katagenesis and reduce permeability and porosity of reservoir rocks. It is shown that zeolite content in reservoir rocks is directly related to the porosity value and can ...
Aleksandr Podnebeshykh, Vasily Ovchinnikov   +1 more
doaj   +2 more sources

Metallogenic Element Geochemistry Characteristics and Genesis of the Zhuxi Copper-Tungsten Polymetallic Deposit, Jiangxi Province Base Using XEPOS X-ray Fluorescence Spectrometry

Yankuang ceshi, 2013
The Zhuxi deposit is a new discovery of copper-tungsten dominated large-super-large ore deposit with great mineralization potential situated in the Zhuxi Area, Jingdezhen City, Jiangxi Province.
SU Xiao-yun, WANG Deng-hong, WANG Cheng-hui, LIU Shan-bao, LIU Jian-guang, FAN Xing-tao, KUAI Li-jun, CHEN Guo-hua, WAN Hao-zhang, ZHANG Cheng, HUANG Gui-qiang   +10 more
doaj  

Insights Into Subduction‐Zone Fluid‐Rock Interactions and Carbon Cycling From Magnesium Isotopes of Subducted Ophiolitic Mélanges in the Arabian‐Nubian Shield

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 3, March 2025.
Abstract Fluid‐rock interactions play an important role in element mobilization, mass transfer, and formation of critical metals in subduction zones. However, tracking the multistage fluid‐rock interactions within subduction channels remains elusive. Here we conducted bulk‐rock major and trace element and magnesium (Mg) isotopic analyses on a suite of ...
Yuan‐Ru Qu, Sheng‐Ao Liu, Hamed Gamaleldien   +2 more
wiley   +1 more source

Water in Eclogite and Pyroxenite Xenoliths From the Bottom 100 km of the Slave Craton (Canada) Mantle Root

Geochemistry, Geophysics, Geosystems, Volume 26, Issue 3, March 2025.
Abstract Major and trace elements, including H2O, were determined in garnet and clinopyroxene to constrain the evolution of mantle xenoliths from Diavik, Canada. The 20 samples, derived from 120 to 220 (240) km depth, define a geotherm equivalent to 37 mW/m2 surface heat flow and include three eclogite (A, B, C) and two pyroxenite (B, C) types (A: High
Esther Schmädicke, Jürgen Gose, Thomas Stachel   +2 more
wiley   +1 more source

Lamprophyres of the Peshchernoe gold deposit, their geological position, material composition, and metasomatic alterations (Northern Urals)

Записки Горного института
The article presents the first data on biotite-hornblende lamprophyres discovered at the Peshchernoe gold deposit. We consider the geological position of lamprophyre dikes in the deposit structure and the relationship of these rocks with tectonically ...
Dmitrii V. Kuznetsov, Sergei Yu. Stepanov, Andrei V. Butnyakov, Viktoriya S. Igosheva   +3 more
doaj  

Diamond preservation in the lithospheric mantle recorded by olivine in kimberlites. [PDF]

Nat Commun, 2023
Giuliani A, Phillips D, Pearson DG, Sarkar S, Müller AA, Weiss Y, Preston R, Seller M, Spetsius Z.   +8 more
europepmc   +1 more source

Water and Oxygen Fugacity in the Lithospheric Mantle Wedge beneath the Northern Canadian Cordillera (Alligator Lake)

Geochemistry, Geophysics, Geosystems, 2018
Assessing water contents of subduction zone mantle peridotites can gain insight into the compositions of slab‐derived fluids/melts and the active margin water cycle.
McKensie L. Kilgore, Anne H. Peslier, Alan D. Brandon, William M. Lamb   +3 more
doaj   +1 more source