Metasomatic process in the formation of rodingite in Boso Peninsula, Chiba, Japan.

Kobayashi, Shôichi; Shoji, Tetsuya

doi:10.2465/ganko.83.514

Cited by 6 publications

(7 citation statements)

References 11 publications

(2 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Whatever their protolith (gabbro or anorthite-diopsidite), the Oman rodingites petrographical and chemical characteristics favours the hypothesis made by the previous workers for rodingites genesis in general (Coleman, 1977;Capedri et al, 1978;Kobayashi and Shoji, 1988;Mittwede and Schandl, 1992;Dubińska, 1997;Bach and Klein, 2009). They appear only in a highly serpentinised host, they are rich to extremely rich in Ca and relatively poor in Si.…”

Section: Formation Of Rodingites In Omanmentioning

confidence: 80%

“…They form as a consequence of the extensive serpentinisation of the mantle, by reaction of a gabbroic protolith with a fluid which composition is controlled by the serpentinisation reaction in the host (Coleman, 1977;Capedri et al, 1978;Kobayashi and Shoji, 1988;Mittwede and Schandl, 1992;Dubińska, 1997;Bach and Klein, 2009). The chemical and textural scatter observed in the Oman rodingite is related to some variety in the protolith, when derived from gabbro, they inherited the gabbroic texture and chemical composition; with a diopsiditic protolith, the absence, or exceptional abundance, of some elements will prevent the crystallisation of some rodingite characteristic phases.…”

Section: Formation Of Rodingites In Omanmentioning

confidence: 99%

“…The invoked source of Ca is usually the breakdown of pyroxenes into serpentine within the host, which release this element in the fluid during alteration. The resulting Ca-rich fluid may then react with a gabbro or any mafic lithology and lead to its Ca enrichment and the rodingite formation (Muraoka, 1985;Kobayashi and Shoji, 1988;El-Shazly and Al-Belushi, 2004;Bach and Klein, 2009). The Ca-rich composition of the rodingite is probably its most characteristic property.…”

Section: Are the Diopsidites A Kind Of Rodingite?mentioning

confidence: 99%

See 2 more Smart Citations

Diopsidites and Rodingites: Serpentinisation and Ca-Metasomatism in the Oman Ophiolite Mantle

Python

Yoshikawa

Shibata

et al. 2011

Dyke Swarms:Keys for Geodynamic Interpretation

View full text Add to dashboard Cite

Section: Formation Of Rodingites In Omanmentioning

confidence: 80%

Section: Formation Of Rodingites In Omanmentioning

confidence: 99%

Section: Are the Diopsidites A Kind Of Rodingite?mentioning

confidence: 99%

See 1 more Smart Citation

Diopsidites and Rodingites: Serpentinisation and Ca-Metasomatism in the Oman Ophiolite Mantle

Python

Yoshikawa

Shibata

et al. 2011

Dyke Swarms:Keys for Geodynamic Interpretation

View full text Add to dashboard Cite

“…Rodingites have a genetical relationship closely with gabbro, basalt, granite and other rocks by metasomatism adjacent to or in peridotite that underwent serpentinization (e.g., Leach and Rodgers, 1978;Kobayashi and Shoji, 1988). Although it is quite difficult to estimate the parent rock of rodingite, the massive rodingite from the Sartuohai chromium deposit should have been a gabbroic rock according to the texture of rodingite (Figs.…”

Section: Formation Of Garnet and Vesuvianite Inclusionsmentioning

confidence: 99%

“…Rodingite is commonly associated with serpentinized peridotite, and is characterized by CaO -and H 2 O -enrichment, and SiO 2 -and alkali -depletion (e.g., Kobayashi and Shoji, 1988). The rock is usually formed by metasomatism of mafic rocks such as gabbro and diorite, although it can be also formed from granitic or siliceous sedimentary rocks included in peridotites.…”

Section: Introductionmentioning

confidence: 99%

Rodingite with Ti- and Cr-rich vesuvianite from the Sartuohai chromium deposit, Xinjiang, China

Kobayashi

Kaneda

2010

Journal of Mineralogical and Petrological Sciences

Self Cite

View full text Add to dashboard Cite

Rodingite containing vesuvianite with the world's highest Cr 2 O 3 and TiO 2 contents was found to occur in the ultramafic body of the Early to Middle Devonian Darbut -Sartuohai ophiolite zone belonging to the Sartuohai alpine -type ophiolitic melange, west Junggar district, Xinjiang, China. Many blocks of massive and vein rodingite were located at the Sartuohai chromium deposit in the serpentinized ultramafic body along the suture zone near Karamay. The rodingite is mainly composed of vesuvianite, grossular -andradite series garnet, diopside, and chlorite. The Cr 2 O 3 content of the rodingite masses and veins is up to 0.2 wt% and 0.1 wt%, respectively. While the Cr 2 O 3 content (wt%) of each mineral species in rodingite is up to 0.04 for vesuvianite, 0.4 for garnet and 0.4 for diopside, respectively. Tiny sporadic inclusions of vesuvianite and garnet of 5 µm to 35 µm in diameter also disseminate along the cleavage or in the grain of diopside of the massive rodingite. The vesuvianite inclusions are characterized by a high concentration in chromium of Cr 2 O 3 = 6.21 wt% and titanium of TiO 2 = 7.43 wt% of all the reported data, in contrast to the low concentration in the host diopside. The garnet inclusions belong to the grandite series. The morimotoite and uvarovite components are 18% and 11% at most, respectively. The rodingite was considered to have been formed by two stages of metasomatism between gabbroic rock and a calcium -rich solution, which was probably produced in the process of serpentinization of peridotite under Cr -and Ti -rich, and Cr -and Ti -free environments.

show abstract

Clinopyroxenites (diopsidites) and metabasites from the East Sarmatian Orogen, East European Craton

Terentiev

Santosh

2016

Geol. J.

View full text Add to dashboard Cite

The East Sarmatian Orogen was built through successive subduction and collision processes at the junction of the Sarmatia and Volga‐Uralia segments of the East European Craton. In this paper we present petrological and geochemical characteristics of diopsidites and host amphibolites from the central part of this orogen. We report a new occurrence of metabasites (meta‐gabbros and amphibolites) and anorthite–bytownite‐bearing diopsidites from the Palaeoproterozoic Vorontsovka terrane of the East Sarmatian Orogen. The diopsidites occur as networks of veinlets and dykes within the metabasite layers (thickness up to 100 m) and are composed predominantly of high‐Mg diopside (Mg# up to 0.87) and calcic plagioclase (An99–73) with traces of K‐feldspar, titanite, calcite, quartz with retrograde chlorite and epidote. The diopsidites are low in Ti and K and high in Mg (Mg# greater than 0.82) rocks. They have low REE; positive Ce, U and Sr anomalies; and negative Th, Nb and Ti anomalies. The meta‐gabbros and amphibolites are composed of calcic amphibole, albite, quartz, biotite, zoisite, prehnite and ore minerals (sulphides + ilmenite). The amphibolites are low Al, low K, magnesian–ferroan (Mg# = 0.46–0.75) and medium Ti (TiO2 0.75–1.37 wt.%) (SiO2 40.1–47.3 wt.%). The meta‐gabbros exhibit slight LREE and LILE enrichment, particularly in Rb, Ba and Sr. The amphibolites are tholeiitic in composition and have N‐MORB‐like REE and HFSE features, with high 143Nd/144Nd (0.512736) and positive εNd(T) (6.0). The diopsidites reported in our study compare with convergent‐margin rocks formed via metasomatic processes associated with slab subduction. The metabasite protoliths represent oceanic crust with N‐MORB‐type features with the LILE enrichment accompanying the subduction zone process. Copyright © 2016 John Wiley & Sons, Ltd.

show abstract

Metasomatic process in the formation of rodingite in Boso Peninsula, Chiba, Japan.

Abstract: Many masses and veins of rodingite derived from hornblende gabbro occur in serpentinized between Ca-rich solutions and hornblende gabbro.

Cited by 6 publications

References 11 publications

Diopsidites and Rodingites: Serpentinisation and Ca-Metasomatism in the Oman Ophiolite Mantle

Diopsidites and Rodingites: Serpentinisation and Ca-Metasomatism in the Oman Ophiolite Mantle

Rodingite with Ti- and Cr-rich vesuvianite from the Sartuohai chromium deposit, Xinjiang, China

Clinopyroxenites (diopsidites) and metabasites from the East Sarmatian Orogen, East European Craton

Contact Info

Product

Resources

About