Results 61 to 70 of about 10,968 (233)

Mineral chemistry of apatite, amphibole, biotite, and magnetite from the Masjeddaghi porphyry Cu-Au deposit, NW Iran: petrogenetic and metallogenic implications

Frontiers in Earth Science
The Masjeddaghi porphyry Cu-Au deposit is situated in the Alborz-Azarbaijan structural zone of northwest Iran. Chemical compositions of rock-forming (biotite, amphibole) and accessory minerals (magnetite, apatite) in the potassic to propylitic altered ...
Zohreh Rahnama, Shohreh Hassanpour, Dany Savard, Zahid Shah   +3 more
doaj   +1 more source

Thermal expansivity and dehydrogenation in amphiboles [PDF]

Acta Crystallographica Section A Foundations of Crystallography, 2009
Few data exist on the thermal expansivity of amphiboles, and they refer to rather exotic compositions which either are not useful to model geologic processes or undergo phase transition. Indeed, amphiboles are not crystal-chemically inert during annealing.
Roberta Oberti (2), Michele Zema (3), Serena Tarantino (3), Massimo Boiocchi (1)   +3 more
openaire   +2 more sources

Revisiting the Hummeln structure, Sweden—A shallow marine Cambrian impact structure

Meteoritics &Planetary Science, EarlyView.
Abstract Hummeln is a simple impact structure located in south‐eastern Sweden. It is approximately 1.2 km in diameter and almost completely covered by a lake. Here, we present the first detailed investigation of impactites and mapping of the 164.25 m deep drill core Hummeln‐1 with a focus on impact metamorphism and the impact process.
S. Alwmark, J. Granbom, P. Ahlberg, M. Calner, S. Richoz, K. J. Gajewska, W. R. Hyde, K. Ljung, C. Alwmark   +8 more
wiley   +1 more source

Libby Amphibole Disease

, 2018
© Copyright 2017 American College of Occupational and Environmental Medicine. Objective: This article describes radiologic and pulmonary function findings among miners exposed to Libby amphibole.
David F. Yankelevitz, Ying Liu, Pfau, J., Noonan, C. W., Yankelevitz, D. F., Liu, Y., +3 additional authors, Brad Black, Laura Linker, Raja Flores, Mingzhu Liang, Liang, M., Claudia I. Henschke, Rowena Yip, Miller, A., Black, B., Flores, R., Tracy McNew, Jean Pfau, Albert Miller, Curtis W. Noonan, Szeinuk, J., Henschke, C. I., Jaime Szeinuk   +23 more
core   +1 more source

The first data on paleomagnetism of Palaeoproterozoic rocks of the Serpovidny structure (the Kola region, northeastern Baltic Shield) [PDF]

Vestnik MGTU, 2016
The orientation of natural magnetization vector components in amphibolites and amphibole schists (magnetite up to 10 %) coincides with that of the modern magnetic field vector.
Matyushkin A. V., Balagansky V. V.
doaj   +1 more source

Ductile Extrusion Triggered by Continental Collision in NE Brazil

Terra Nova, EarlyView.
ABSTRACT The Borborema Province in northeastern Brazil hosts one of the world's largest strike‐slip shear zone networks, active during the late Neoproterozoic assembly of West Gondwana. Whether these shear zones initiated during active continental collision or as a post‐orogenic response to far‐field stresses remains debated.
L. R. Tesser, C. E. Ganade, C. R. Cioffi, J. B. Forshaw, M. Hueck, E. Celis, M. A. S. Basei   +6 more
wiley   +1 more source

Clay minerals in early amphibole weathering : Tri- to dioctahedral sequence as a function of crystallization sites in the amphibole

, 2006
The early stages of amphibole weathering result in the crystallization of several clay mineral species: tri- and dioctahedral smectites, interstratified dioctahedral kaolinite-smectite (K-S), and halloysite.
Caillaud, J., Proust, D., Fontaine, C.
core   +1 more source

Compositional Zoning in Amphibole from Amphibole Bearing Parageneses of West Psunj (Croatia): Evidence for Progressive Metamorphism?

Geologia Croatica, 2010
Amphibole bearing parageneses from the western part of Mt. Psunj (Croatia) record evidence of prograding metamorphism. Opticaland microprobe analyses, together with thermobarornetric evaluationson amphibole bearing parageneses, show a zonation with Si ...
Dražen Balen, Vladimir Bermanec, Vera Marci   +2 more
doaj   +1 more source

The Capability of Amphibole in Tracing the Physicochemical Processes of Magma Mixing

Geophysical Research Letters
This study explores the capability of amphibole in tracing the physicochemical process of magma mixing through spatially associated gabbros, mafic microgranular enclaves (MMEs) and granodiorites from central Tibet.
Mingjian Li, Yunchuan Zeng, Massimo Tiepolo, Jifeng Xu, Enrico Cannaò, Francesca Forni, Feng Huang   +6 more
doaj   +1 more source

Hyperspectral Fingerprinting of Dune Sediments Across the Arabian Peninsula: Insights Into Sediment Provenance and Transport Pathways From NASA's EMIT Data

Geophysical Research Letters, Volume 53, Issue 12, 28 June 2026.
Abstract The Arabian Peninsula encompasses one of the world's most extensive aeolian systems, yet the provenance and transport history of its dune sediments are not well understood. Using hyperspectral data from NASA's Earth Surface Mineral Dust Source Investigation (EMIT), we mapped mineral compositions and abundance patterns across dune fields and ...
Ahmed Alshakr, Mohamed Sultan, Mustafa Kemal Emil, Hassan Alharbi, Fahad Alshehri, Abdullah A. Alotaibi, Abdullah T. Mohammad, Aylin Yildirim, Neil C. Sturchio   +8 more
wiley   +1 more source