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Coesite from
Dora-Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy


Locality type:Rock Unit
Classification
Species:Coesite
Formula:SiO2
Confirmation
Validity:Believed Valid
Data
Mineral Data:Click here to view Coesite data
Locality Data:Click here to view Dora-Maira coesite-bearing unit, Cuneo Province, Piedmont, Italy
Photo GalleryView Gallery (3 photos)
Data Identifiers
Mindat Occurrence Record ID:3837
Long-form Identifier:1:3:3837:9
GUID (UUID V4):8a378efe-53a8-4a02-a767-fcc626e4fcd6
References
Reference Search (possible matching items)
Journal (article/letter/editorial)
the managing editor: In his iconic 1984 paper, “Coesite and pure pyrope in high-grade blueschists of the...study the Dora-Maira rocks? Mineralogist doing humble work: Christian Chopin at the pyrope– coesite locality...locality near Martiniana Po, Italy, ca. 1984. Interesting minerals even pave the dirt road. PHOTO COURTESY...the Western Alps, along with the Monte Rosa and Dora-Maira massifs), I went for a postdoc at Bochum with...years, Photomicrograph (crossed polarizers) of a coesite rimmed by palisade quartz in pyrope garnet. Picture
Journal (article/letter/editorial)
geochemistry and phase equilibria of coesite-bearing whiteschists, Dora Maira Massif, western Alps Z.D. Sharp...metamorphic temperatures for the coesite-pyrope-bearing whiteschists from the Dora Maira Massif, western Alps were...thermometry. The 818 O(svow) values of the quartz (after coesite) (~180 = 8.1 to 8.6%0, n = 6), phengite (6.2 to...reaction pyrope + coesite = kyanite + enstatite. In order to stabilize pyrope and coesite by the temperature-sensitive...dehydration reaction talc + kyanite = pyrope + coesite + H20, the a(H20) must be reduced to 0.4-0.75 at
Journal (article/letter/editorial)
The most spectacular findings were the minerals coesite and dia0024.4937/97/$17.00 0 1997 Published PII...Ultrahigh-pressure metamorphism in the stability field of coesite implies that crustal material has been buried to...now classical ultrahigh-pressure rocks of the Dora Maira Massif, Western Alps, yielded results that not...concepts on Alpine tectonics but also have a profound bearing on geodynamics and rates of tectonic processes...absolute error. Using the SHRIMP technique on Dora Maira zircons Gebauer et al. could, perhaps finally
Journal (article/letter/editorial)
constraints for the (U)HP nappe stack of southern Dora-Maira Massif (Western Alps) Chiara GROPPO1,2,*, Simona...of Torino, Via Valperga Caluso 35, 10125 Torino, Italy *Corresponding author, e-mail: chiara.groppo@unito...10125 Torino, Italy Abstract: The Brossasco-Isasca Unit (BIU) of the southern Dora-Maira Massif (DMM)...literature as a tectonic “sandwich”, with the UHP unit in the middle, bounded by two high-pressure (HP)...footwall (the San Chiaffredo Unit, SCU) and hanging wall (the Rocca Solei Unit, RSU), respectively. These
Journal (article/letter/editorial)
Manuscript Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography...Rixiang Zhu , Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography...MANUSCRIPT Mantle wedge exhumation beneath the Dora-Maira (U)HP dome unravelled by local earthquake tomography...Nazionale di Geofisica e Vulcanologia, CNT, Genova, Italy 2 Department of Earth and Environmental Sciences...Sciences, University of Milano-Bicocca, Milano, Italy 3 Univ. Grenoble Alpes, Univ. Savoie Mont-Blanc, CNRS
Journal (article/letter/editorial)
http://www.tandfonline.com/loi/tigr20 The UHP Unit in the Dora-Maira Massif, Western Alps a Christian Chopin...Chopin & Hans-Peter Schertl (1999) The UHP Unit in the Dora-Maira Massif, Western Alps, International Geology...Son. Inc. All rights reserved. The UHP Unit in the Dora-Maira Massif, Western Alps CHRISTIAN CHOPIN ...Abstract New results acquired in the coesite-bearing terrane of the Dora-Maira massif, Italian Western Alps,... indicate that the UHP unit extends over less than 45 km2 and is bounded by two lower-grade continental
Journal (article/letter/editorial)
Geochemistry of coesite-bearing ‘‘pyrope quartzite’’ and related rocks from the Dora-Maira Massif, Western...quartzite’’, various phengite-schist and jadeite-bearing rock intercalations, as well as for enclosing orthogneiss...from different localities within the southern Dora-Maira Massif is presented, in order to establish the...kinship to the enclosing orthogneiss. Jadeite-bearing rocks, which occur as conformable layers and boudins...entire range of the Alps. Key-words: geochemistry, Dora-Maira Massif, ‘‘pyrope quartzite’’, UHP, metasomatism
Journal (article/letter/editorial)
fractionation in the coesite-bearing ‘pyrope quartzite’ and related rocks of the Dora-Maira Massif, Western...ultrahigh-pressure (UHP) metamorphic rocks from the Dora-Maira Massif as well as of their granitic country rocks...the retrograde breakdown of pyrope to a chlorite-bearing assemblage, these elements became mobilized and...the leucophyllite samples as well. Key-words: Dora-Maira, ‘pyrope quartzite’, whiteschist, UHP, mobility...Introduction located in the southern part of the Dora-Maira Massif, Western Alps (e.g., Chopin, 1984; Chopin
Journal (article/letter/editorial)
The metamorphic and deformational history of coesite-bearing, ultrahigh-pressure metamorphic oceanic crust...of more than 80 km, in the stability field of coesite. The deformation was progressively localised into...‘classical’ area of UHPM continental crust in the Dora Maira Massif, western Alps. In that area, the U-Pb...for Dabie Shan by Hacker et al. (1995) and for Dora Maira by Wheeler (1991), Henry et al. (1993) and Michard...Valtoumanche, the western Alps of 41 (1997) 79-102 Italy (Reinecke, 1991; Reinecke et al., 1994). The structural
Journal (article/letter/editorial)
isotope data from garnets in ultrahigh-pressure (coesite-bearing) eclogite from the Western Alps were obtained...rocks will not be well constrained. Dating garnet-bearing eclogites traditionally has 0012-821X/99/$ - see...T~sch (2) also shown. method to the coesite-bearing eclogite unit at Lago di Cignana (Fig. 1). The high-precision...present throughout the Valtournanche, northern Italy ([15,16], and our mapping). Both the serpentinite...quartzites and metapelites [17], some of which contain coesite [18]. This protolith sequence is preserved more
Journal (article/letter/editorial)
evidence for diamond-facies metamorphism in the Dora-Maira massif Jörg Hermann * Research School of Earth...conditions of subducted continental crust in the Dora-Maira massif (Western Alps) have been revised by combining...+ kyanite + coesite F talc originates from the reaction kyanite + talc X garnet + coesite + liquid. In...either to orthopyroxene and coesite or, together with phengite, to biotite, coesite and kyanite. The liberated...fluid-absent equilibrium 4 kyanite + 3 celadonite = 4 coesite + 3 muscovite + pyrope has been calibrated on the
Journal (article/letter/editorial)
Earth’s surface. Discoveries of such minerals as coesite and 816 A. Pilchin / Earth and Planetary Science...delivery from great depths. Moreover, the presence of coesite is accepted as the required criteria for UHP conditions...growth in the number of regions where coesite- and micro-diamond-bearing rocks, along with such HP–LT to UHP–LT...basement, the Alps Monte Rosa, Gran Paradiso and Dora–Maira massifs, Western Alps Lower Austroalpine nappe...Window Tauern Window, lower Schieferhulle Same unit Same unit p, pressure (100 MPa) T, temperature (8C)
Report (chapter)
units. The allochthonous unit is composed of UHP rocks. The parautochthonous unit is represented by the...autochthonous unit includes Jurassic and Cretaceous sedimentary and igneous rocks. The reworked unit is characterized...the subducted continental materials. If the UHP unit is the piston to build up the orogenic belt, then...the UHP terranes. Although the first report of coesite from China (Xu, Z. 1987) was made three years later...Europe (Chopin 1984; Smith 1984), the Chinese coesite has attracted world-wide attention since the very
Report (chapter)
subduction and exhumation: an example from the Ulten Unit, Tonale Nappe, Eastern Austroalpine G I O R G I...Matematiche, Universitgt dell'Insubria, 1-22100 Como, Italy Abstract: Some exhumed complexes in collisional...illustrated by the Late Palaeozoic evolution of the Ulten Unit, Tonale Nappe, Eastern Austroalpine. The upper crustal...applicable to the Late Palaeozoic history of the Ulten Unit, Tonale Nappe, Eastern Austroalpine, and similar...complexes. The regional tectonic setting of the Ulten Unit is dominated by the Cretaceous to Tertiary oblique
Journal (article/letter/editorial)
of UHP metamorphism. Domain 2 contains diamond, coesite, omphacite and titanian phengite inclusions providing...continental collision. Introduction The Ÿnding of coesite (Chopin 1984; Compagnoni et al. 1995) and metamorphic...zircon age and the metamorphic evolution of the rock unit. One key area to study exhumation of deeply subducted...the Kokchetav Massif in Kazakhstan where diamond-bearing metamorphic rocks occur (Fig. 1). Previous dating...after Dobretsov et al. (1995) of the diamond-bearing rocks were presented. Sm±Nd dating of these rocks
Journal (article/letter/editorial)
southern Urals contains a regionally coherent crustal unit that experienced peak metamorphic conditions of...C at 378  6 Ma. Exhumation of the high-pressure unit occurred under retrograde blueschist and middle/lower...during decompression. The rise of the high-pressure unit to a mid-crustal depth (  20 km) was accommodated...histories (Lennykh 1977; Lennykh et al. 1995). The lower unit 1 has been interpreted as subducted continental...of the East European platform, whereas the upper unit 2 is thought to represent Palaeozoic oceanic crust
Journal (article/letter/editorial)
with the upper and lower boundaries of this high-P unit; exceptions include Kawato et al. (1991), Sasaki...which are well-developed in the northern part of the unit, decrease in intensity southward. The degree of...propagate from the main fault into the underlying unit. An excellent outcrop of the lower boundary exposed...Terabayashi et al. (2002) demonstrated that underlying unit was thermally metamorphosed by the tectonic juxtaposition...transported to the overlying high-P–ultrahigh-P unit. Metamorphic belts are hydrated during exhumation
Journal (article/letter/editorial)
particular the Koralm Complex of the Austroalpine Unit, and the Internal Penninic Nappes of the Eastern...pressure-temperature path is characterized by cooling in the Dora Maira Massif, the Gran Paradiso, the Monte Rosa Nappe...other rock types, blueschists, eclogites, coesite-bearing rocks 1Corresponding author. Present address:...0020-6814/02/611/702-42 $10.00 (Chopin, 1984), and diamond-bearing rocks (e.g., Sobolev and Shatsky, 1990; Schreyer..., ZermattSaas ophiolite with eclogite and coesite-bearing quartzite; Bearth, 1959; Reinecke, 1991, 1998;
Journal (article/letter/editorial)
part of the east European plate. The eclogite-bearing zone is a NW–SE-trending sliver of composite rocks...gneisses, epidotebearing amphibolites and garnet-bearing mica schists, with minor massive and banded mafic...1984; Pognante, 1989) and the northeastern Jiangsu Province (Yang et al., 1993). With regards to the range...Science L etters, 132, 225–232. Chopin, C., 1984. Coesite and pure pyrope in high grade blueschists of the...Ma old ultrahigh-pressure metamorphism in the Dora-Maira massif and its geodynamic implications for the
Journal (article/letter/editorial)
Tertiary extension within the Basin and Range province in the western United States may represent this...Parallel/perpendicular Parallel Queyras area Oblique Dora Maira area Parallel Monviso area Versoyen zone Parallel...southern Dora Maira ultra-high-pressure massif (Western Alps): view from below the coesite-bearing unit. J...a normal ductile fault in the Roignais-Versoyen unit (Western Alps, France). C.R. Acad. Sci. 21:513–19... 1994. Late orogenic brittle extension in the Piedmont Schistes Lustres (Queyras, Western Alps, France)
Journal (article/letter/editorial)
the SinoKorean and Yangtse cratons ĆœFig. 1.. Coesite-bearing rocks Ćœmainly eclogites. are widely distributed...used to constrain Ćœ1. the petrogenesis of the coesite-bearing eclogites and associated ultramafic rocks,...the north by a greenschist facies meta-sedimentary unit, the Foziling Group, which is composed of several...granitic gneiss in the Kongling Group in Hubei Province ĆœZheng et al., 1991; Ames et al., 1996. is very...disagreement abounds, particularly concerning the NDC. This unit has been regarded as Ćœ1. a less deeply subducted
Journal (article/letter/editorial)
in this paper, refers to the blueschist-facies-bearing orogenic belt, which often includes many other...stabilities of diamond-graphite (Bundy, 1980), coesite-quartz (Bohlen and Boettcher, 1982), jadeite +...aragonite-bearing rocks often appear in the circum-Pacific and the Tethyan orogenic belts. Coesite- and (rarely)...(rarely) diamond-bearing metamorphic rocks are exposed within tectonic collages formed by continental-collision...metamorphism. The P / T estimate of glaucophane-bearing rocks is about 450° C and 9 kbar (Laird and Albee
Journal (article/letter/editorial)
Thus, the Briançonnais may be seen as a continental unit Downloaded by [Columbia University] at 10:27 14... high-pressure rocks situated within the Valais unit in the Versoyen area (Fig. 1) may be interpreted...Eiermann, 1988). In the Central Alps, the Valais unit is present in the Misox zone between the Tambo nappe... 1), and in the Western Alps by parts of the Dora Maira (Philippot, 1990; Chopin et al., 1991; Henry...facies. In places, metatuffs and MORB-type (garnet-bearing) greenschists, locally with relics of pillow structures
Journal (article/letter/editorial)
uplift (“jadeite uplift” consists of jadeitite-bearing serpentinite mĂ©lange and other metamorphic units)...glaucophanebearing quartz-schist and phengitic muscovite-bearing quartz-schists that may have correlation with the...muscovite-bearing glaucophane-schist, stilpnomelane-bearing quartzite, phengitic muscovite-bearing quartz-schist...quartz-schist, garnet-bearing amphibolite and diopside-bearing marble occur (Bender, 1983; Shi et al., 2001)...metasomatic 3 aggregates of kosmochlor, Cr-bearing jadeite, Cr-bearing omphacite and jadeitized rodingite (Shi
Journal (article/letter/editorial)
blueschists and eclogites (and even more so lawsonite-bearing maïŹc eclogites) provide important anchor points...metamorphic facies. Mineral abbreviations: albite (Ab), coesite (Coes), lawsonite (Law), quartz (Q). contrasts...units underlying the ZS ophiolite (e.g. Monte Rosa unit), and mechanically weak serpentinites associated...Saas-Fee area (Switzerland) to the Aosta valley (Italy; Fig. 1c), belongs to the internal Liguro– S....26–28 kbar), like the Lago di Cignana unit, where rare coesite inclusions within garnet and omphacite
 
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