George S.K. Ma | Academia Sinica

This, together with their low SiO2 and high TiO2 and Dy/Yb, is consistent with magma genesis involving a large proportion of garnetbearing hornblendite or similar amphibolerich metasomatic veins. Associated alkali and tholeiitic basalts with the higher SiO2, lower TiO2, less negative K, Rb and Zr anomalies, and moderately high Dy/Yb are ...

Alkaline magma series

Geochemical characterization. Rocks in the alkaline magma series are distinguished from rocks in the subalkaline tholeiitic and calcalkaline magma series by their high content of alkali metal oxides (K 2 O plus Na 2 O) relative to silica (SiO 2).They are distinct from the rare peralkaline magmas, which have excess alkali oxides relative to alumina (Na 2 O + K 2 O > Al 2 O 3).

SciELO

Figure 1 Locality map for the Cretaceous to Early Cenozoic felsic alkaline intrusive bodies of the state of Rio de Janeiro, modified from Sichel et al. (2012 Sichel SE, Motoki A, Iwanuch W, Vargas T, Aires JR, Melo DP, Motoki KF, Balmant A and Rodrigues JG. 2012. Fractionation crystallization and continental crust assimilation by the felsic alkaline rock magmas of the State of Rio de Janeiro ...

Transformation from oxidized to reduced alkaline magmas in ...

Jun 01, 2021 · To identify variations in the oxygen fugacity of alkaline magmas, minerals with multivalent elements are key. For example, mineral inclusions (, barite and hematite) in early crystallized minerals can be used to constrain the redox state of primitive magmas ( Moussallam et al., 2016 ; Tepper and Kuehner, 1999 ).

(PDF) Contributions from mafic alkaline magmas to the ...

The Role of Magmatic Sulfides and Mafic Alkaline Magmas in the Bingham and Tintic Mining Districts, Utah. By Jeffrey Keith, Eric H Christiansen, and Keiko Hattori. The volcanic history and magmatic sulfide mineralogy of latites of the central East Tintic Mountains, Utah .

"AlkalicType Epithermal Gold Deposit Model: Chapter R of ...

Apr 15, 2021 · This report summarizes the primary characteristics of alkalictype epithermal gold (Au) deposits and provides an updated descriptive model. These deposits, primarily of Mesozoic to Neogene age, are among the largest epithermal gold deposits in the world. Considered a subset of lowsulfidation epithermal deposits, they are spatially and genetically linked to small stocks or clusters of ...

Industrial Minerals of Mozambique

Cilek: 1. Introduction. 1. INTRODUCTION. Mozambican resources of industrial minerals and rocks are large enough to cover most of the. requirements of the national industry and to contribute also to the export. The most recent data on more. than forty industrial raw materials of Mozambique will help the geologist, the mining engineer, the. planners and decisionmakers in the government to find ...

White Mountains

The Monteregian Hills and White Mountain Alkaline Igneous Provinces, Eastern North America. Eby, G. N. The Monteregian Hills and White Mountain provinces consist of stocks, plugs, ringdyke complexes and several large granite bodies emplaced into Precambrian gneisses, flatlying CambroOrdovician sediments and the deformed Lower Palaeozoic section of the Appalachian fold belt.

Chemical and isotopic compositions of lavas from the ...

Accepting a Kerguelen plume origin for the plateau lavas, these characteristics probably reflect the shallowlevel incorporation of continental lithosphere in either the head of the early Kerguelen plume or in plumederived magmas, and suggest that the influence of such material diminished after the period of plateau construction.

Sources and processes in arc magmatism: The crucial role ...

Sources and processes in the subarc mantleArc magmatism occurs where an oceanic plate is subducted underneath another oceanic or continental plate, creating an island arc or a continental arc, respectively. During the 1960's and 70's, debate raged about what actually melted to create arc magmas (Green, 1972) the mantle.

Geochemistry of Sandstone Type Uranium Deposit in Tarat ...

The study aimed at investigating the geochemistry of a sandstonetype uranium deposit in Tarat formation for provenance, paleoredox, tectonic setting in order to propose a geological model of uranium. XRay Fluorescence (XRF) and Induced Coupled Plasma Mass Spectrometry (ICPMS) analyses were used to determine the sandstone composition.

Source and fractionation controls on subductionrelated ...

We show that trace element ratios such as Nb/Ta and Dy/Yb systematically decrease with increasing SiO 2, for both the 1716 Ma calcalkaline and the 1213 Ma Krich transitional magmatism. In contrast, Th/Nb and La/Nb monitor the changes in the source composition of these magmas.

IJG_

alkaline Yemen Trap Series, YTS, and MioceneRecent alkaline Yemen Volcanic Series, YVS. Magmas of the YTS were erupted during the synrift phase and correlate with the first stage of seafloor spreading of the Red Sea and the Gulf of Aden (30 – 15 Ma), whereas magmas of the YVS were ascended during the post rift phase, con

dysprosium in alkalic magmas

dysprosium in alkalic magmas. dysprosium in alkalic magmas. Calcalkaline magma series Wikipedia, the free encyclopedia. The calcalkaline magma series is one of two main magma series in igneous rocks, the other magma series being the tholeiitic.

Middlemost, (1985) Magmas and Magmatic Rocks. An ...

Middlemost, (1985) Magmas and Magmatic Rocks. An Introduction to Igneous Petrology. Longman Group Ltd., London, New York, 266 p. has been cited by the following article: TITLE: Mineral Chemistry and Magmatic Differentiation Evidences in the Neshveh Intrusion (NW Saveh, Central Iran)

Understanding Degassing and Transport of CO2rich Alkalic ...

Alkalic magmas provide a critical test for CO 2fluxing because they typically have high magmatic CO 2 concentrations, inherited from their generation by low degrees of partial melting and possible enriched mantle sources (Sun McDonough, 1989; Dasgupta et al., 2007).

Petrology and geochemistry of calcalkaline volcanic and ...

Ayati, Farimah and Yavuz, Fuat and Asadi, Hooshang H. and Richards, Jeremy P. and Jourdan, Fred. 2013. Petrology and geochemistry of calcalkaline volcanic and subvolcanic rocks, Dalli porphyry copper–gold deposit, Markazi Province, Iran. International Geology Review. 55 (2): pp. 158184.

Magmas and magmatic rocks: An introduction to igneous ...

article{osti_, title = {Magmas and magmatic rocks: An introduction to igneous petrology}, author = {Middlemost, E }, abstractNote = {This book melds traditional igneous petrology with the emerging science of planetary petrology to provide an account of current ideas on active magmatic and volcanic processes, drawing examples from all igneous provinces of the world as well as from ...

The World of Mineral Deposits A Beginner`s Guide to ...

Chromium, Nickel, and Platinum in Basic Magmas Bushveld Complex Great Dyke Sudbury Igneous Complex Komatiite Hosted Deposits AnorthositeHosted Deposits KirunaType Magnetite Apatite Iron Ore Granite (Introduction) Tin Granite Pegmatite Alkaline Rocks (Introduction) Carbonatite ...

Crustal magmatic controls on the formation of porphyry ...

Jul 06, 2021 · Andeantype magmas are also typically associated with calcalkaline (early Fe depletion) magmas rather than tholeiitic magmas 3,21. We stress that .

LIBRARY XJNffSnERSITY OF CALIFORNIA DAVIS MINERAL RESOURCES OF CALIFORNIA BULLETIN 191 1966 California Division of Mines and Geology Ferry Building, San Francisco, CA 94111 LIBRARY UNIVERSITY OF CALIFORNIA DAVIS This volume, "Mineral Resources of California", is Port I .

Metasomatized Lithosphere and the Origin of Alkaline Lavas ...

May 16, 2008 · Recycled oceanic crust, with or without sediment, is often invoked as a source component of continental and oceanic alkaline magmas to account for their traceelement and isotopic characteristics. Alternatively, these features have been attributed to sources containing veined, metasomatized lithosphere. In melting experiments on natural amphibolerich veins at .

Chemical

Alkaline Earth Metals Transition Metals Other Metals Metalloids NonMetals Halogens Noble Gases Rare Earth Elements Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page. Basic Information Name: Dysprosium Symbol: Dy Atomic Number: 66 Atomic Mass: amu Melting Point: °C ( K, °F)