P. Bottazzi

Institute of Geosciences and Earth Resources

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R. Vannucci

École Polytechnique Fédérale de Lausanne

Luisa Ottolini

Institute of Geosciences and Earth Resources

Giovanni B. Piccardo

University of Genoa

Elisabetta Rampone

University of Genoa

Massimo Tiepolo

University of Milan

Alberto Zanetti

Institute of Geosciences and Earth Resources

Maurízio Mazzucchelli

University of Modena and Reggio Emilia

Riccardo Tribuzio

National Institute of Oceanography and Applied Geophysics

Giorgio Rivalenti

Institute of Mineralogy

Stephen F. Foley

Macquarie University

Cooperative Institutions

Institute of Geosciences and Earth Resources

University of Manitoba

National Research Council

University of Pavia

University of Oslo

Centre National de la Recherche Scientifique

University of Genoa

Université Paris Cité

Consejo Superior de Investigaciones Científicas

Institute of Mineralogy

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Origin of LREE-depleted amphiboles in the subcontinental mantle

Geochimica et Cosmochimica Acta (1995)

R. Vannucci Giovanni B. Piccardo Giorgio Rivalenti Alberto Zanetti Elisabetta Rampone

Amphibole

Peridotite

Xenolith

Solidus

Metasomatism

10.1016/0016-7037(95)00080-j

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Citations (75)

Partitioning of REE, Y, Sr, Zr and Ti between clinopyroxene and silicate melts in the mantle under La Palma (Canary Islands): implications for the nature of the metasomatic agents

Earth and Planetary Science Letters (1998)

R. Vannucci P. Bottazzi E. Wulff-Pedersen E.‐R. Neumann

Metasomatism

Carbonatite

Peridotite

Xenolith

Incompatible element

Primitive mantle

Silicic

10.1016/s0012-821x(98)00040-5

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Citations (99)

Origin and structural character of haüyne_ssin spinel dunite xenoliths from La Palma, Canary Islands

American Mineralogist (2000)

E. Wulff-Pedersen Else‐Ragnhild Neumann E. A. J. Burke R. Vannucci P. Bottazzi

Two spinel dunite xenoliths (Fo89.8-91.2 in olivine) from La Palma contain minor amounts (<1%) of a pale-blue sodalite-group mineral with haüyne/lazurite chemistry. Selected-area electron diffraction (SAED) patterns of this phase indicate a cubic unit cell with dimensions 9.12 ± 0.02 Å, and space group P4̅3n. Superstructure spots along three <110> directions are common, implying commensurate or incommensurate modulations along <110> directions. Raman spectra show peaks typical of both lazurite and haüyne. It is concluded that the mineral has a structure intermediate between those of pure lazurite and pure haüyne, and it is here referred to as haüyness. The haüyness occurs together with strongly nepheline-normative glass in thin veinlets (<0.1 mm), in interstitial glass pockets, and as inclusions in olivine porphyroclasts. To our knowledge lazurite or haüyne has not previously been described in mantle rocks. The haüyness is strongly depleted in REE and most other highly lithophile elements relative to the coexisting glass, whereas Dmineral/glass for Sr is ≈1.0, and DEu higher than the other REE. The haüyness crystallized from a melt now present as phonolitic glass, probably in response to rapidly decreasing pressure during transport of the xenoliths to the surface. The coexistence of haüyness and FeS-rich sulfide globules in some samples suggests slightly more oxidizing conditions than for samples in which the glass contains sulfide globules alone.

Xenolith

Nepheline

10.2138/am-2000-1008

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Citations (13)

Incompatible element-rich fluids released by antigorite breakdown in deeply subducted mantle

Earth and Planetary Science Letters (2001)

Marco Scambelluri P. Bottazzi Volkmar Trommsdorff R. Vannucci Jörg Hermann

Trace element

Lithophile

Incompatible element

10.1016/s0012-821x(01)00457-5

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Citations (166)

A LASER PROBE COUPLED WITH ICP DOUBLE-FOCUSING SECTOR-FIELD MASS SPECTROMETER FOR IN SITU ANALYSIS OF GEOLOGICAL SAMPLES AND U Pb DATING OF ZIRCON

The Canadian Mineralogist (2003)

Massimo Tiepolo P. Bottazzi M. Palenzona R. Vannucci

Quadrupole ICP–MS is currently the method of choice for laser-ablation applications, since sector-field instruments are generally considered too slow for the acquisition of rapidly varying signals. However, the new generation of double-focusing sector-field mass spectrometers is capable of rapidly scanning the mass spectrum both magnetically and electrostatically, and the combination of these two scan modes approaches the performance of quadrupoles for most practical applications. We present the instrumental configuration and operating conditions of a LA–ICP–MS system, assembled by coupling a 266 nm laser source to a double-focusing magnetic-sector mass spectrometer (“Element”, Finnigan MAT). The capability of the adopted configuration to furnish high-quality in situ trace-element analysis of minerals and U–Pb geochronological data is described. Concentrations of thirty geochemically relevant elements ( LILE , HFSE , REE , actinides) were determined on geological samples with good precision and accuracy (<10%), evaluated using two USGS basaltic glass reference materials, BCR–2 and BIR–1. The high sensitivity and low background allowed extremely low limits of detection (down to the ppb level) for the heaviest elements, and between 10 and 100 ppb for the lighter masses. The first results on U:Pb ratio determinations are also very positive. By adopting an external matrix-matched standard for corrections of mass bias and laser-induced fractionation of elements, precision and accuracy in age determinations to better than ~2% are attained on the zircon standard 91500.

Optical dating

10.2113/gscanmin.41.2.259

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Citations (148)

Rare earth element redistribution during high-pressure–low-temperature metamorphism in ophiolitic Fe-gabbros (Liguria, northwestern Italy): Implications for light REE mobility in subduction zones

Geology (1996)

Riccardo Tribuzio Bruno Messiga R. Vannucci P. Bottazzi

Research Article| August 01, 1996 Rare earth element redistribution during high-pressure–low-temperature metamorphism in ophiolitic Fe-gabbros (Liguria, northwestern Italy): Implications for light REE mobility in subduction zones Riccardo Tribuzio; Riccardo Tribuzio 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy Search for other works by this author on: GSW Google Scholar Bruno Messiga; Bruno Messiga 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy2C.N.R.–Centro di Studio per la Cristallochimica e la Cristallografia, Via Ferrata 1, I-27100 Pavia, Italy Search for other works by this author on: GSW Google Scholar Riccardo Vannucci; Riccardo Vannucci 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy2C.N.R.–Centro di Studio per la Cristallochimica e la Cristallografia, Via Ferrata 1, I-27100 Pavia, Italy Search for other works by this author on: GSW Google Scholar Piero Bottazzi Piero Bottazzi 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy Search for other works by this author on: GSW Google Scholar Author and Article Information Riccardo Tribuzio 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy Bruno Messiga 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy2C.N.R.–Centro di Studio per la Cristallochimica e la Cristallografia, Via Ferrata 1, I-27100 Pavia, Italy Riccardo Vannucci 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy2C.N.R.–Centro di Studio per la Cristallochimica e la Cristallografia, Via Ferrata 1, I-27100 Pavia, Italy Piero Bottazzi 1Dipartimento di Scienze della Terra, Università di Pavia, Via Ferrata 1, I-27100 Pavia, Italy Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1996) 24 (8): 711–714. https://doi.org/10.1130/0091-7613(1996)024<0711:REERDH>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Riccardo Tribuzio, Bruno Messiga, Riccardo Vannucci, Piero Bottazzi; Rare earth element redistribution during high-pressure–low-temperature metamorphism in ophiolitic Fe-gabbros (Liguria, northwestern Italy): Implications for light REE mobility in subduction zones. Geology 1996;; 24 (8): 711–714. doi: https://doi.org/10.1130/0091-7613(1996)024<0711:REERDH>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract To unravel the rare earth element (REE) redistribution during high-pressure–low-temperature metamorphism, we have analyzed by ion microprobe all the minerals from representative Fe-gabbros from Ligurian metaophiolites (northwestern Italy). Contrary to what is observed for fresh Fe-gabbros, the clinopyroxene contribution to the whole-rock REE inventory of blueschists and eclogitized Fe-gabbros is minor or negligible. In both blueschists and eclogites, REE are redistributed among newly formed minerals. In blueschists, lawsonite is the major REE carrier and concentrates almost all the light REE (LREE) in the rock, whereas titanite plays an important role for middle and heavy REE (MREE, HREE). In eclogites, LREE and HREE mainly reside in accessory allanite and garnet, respectively. The development of blueschist and eclogite facies mineral assemblages in mafic oceanic crust, due to subduction to 35–65 km depths, was not accompanied by release of significant amounts of LREE to the overlying mantle wedge. Owing to the stability of lawsonite and epidote at ultra-high-pressure conditions, subduction of mafic rocks is considered an effective mechanism to bring LREE to great depth within the mantle. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.

10.1130/0091-7613(1996)024<0711:reerdh>2.3.co;2

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Citations (131)

Chemistry and origin of trapped melts in ophioiitic peridotites

Geochimica et Cosmochimica Acta (1997)

Elisabetta Rampone Giovanni B. Piccardo R. Vannucci P. Bottazzi

Peridotite

Incompatible element

Melt inclusions

10.1016/s0016-7037(97)00260-3

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Citations (128)

Crystal-chemical variations in amphiboles close to a hornblendite vein: implications for models of mantle metasomatism

Alberto Zanetti R. Vannucci P. Bottazzi Roberta Oberti Luisa Ottolini

Systematic investigations of compositional variations in peridotite infiltrated by a small volume of metasomatic agent allow a better understanding of both the scales and processes of mantle metasomatism (Nielsen et al., 1993; Nielsen and Wilshire, 1993). Insights into liquid-rock mantle reactions have been provided by recent whole-rock (Bodinier et al., 1990) and clinopyroxene (Takazawa et al., 1992) investigations, from which the composition of most altered and uumetasomatized end-members as well as reaction gradients can be evaluated. This study focuses on amphibole directly deposited by the reacted melt, as it is the most sensitive phase to changes in liquid composition. Variations in amphibole crystal-chemistry can be, therefore, applied in monitoring P-T-X gradients. We used a combination of microanalytical techniques (EPMA and SIMS) and single-crystal structure refinements (SREF) to investigate compositional variations in amphiboles in proximity (m-scale) of an alkaline vein infiltrated in the ambient peridotite.

Amphibole

Metasomatism

Peridotite

Crystal Chemistry

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Citations (0)

Mantle processes in the sub-continental lithosphere: the case study of the rifted sp-lherzolites from Zabargad (Red Sea)

European Journal of Mineralogy (1993)

Giovanni B. Piccardo Elisabetta Rampone R. Vannucci Nobumichi Shimizu Luisa Ottolini

10.1127/ejm/5/6/1039

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Citations (24)

Li : an important component in igneous alkali amphiboles

American Mineralogist (1993)

F. C. Hawthorne Luciano Ungaretti Roberta Oberti P. Bottazzi Gerald K. Czamanske

The crystal structures of 13 alkali amphiboles have been refined to R values of 1-2% using single-crystal MoKα x-ray data. Crystals used in the collection of the intensity data were subsequently analyzed by elecrton and ion micrprobe. Site occupancies were assigned by site-scattering refinement and stereochemical considerations, taking into account the electron and ion microprobe analysis of each crystal. These alkali amphiboles are primarily eckermannite-arfvedsonite from peralkaline granites

Amphibole

Peralkaline rock

Microprobe

Crystal (programming language)

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Citations (67)