Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
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| Title | Stable isotope studies of nephrite deposits from Fengtien, Taiwan |
| Creator/Author | Yui, Tzenfu ; Yeh, Hsuehwen (Univ. of Hawaii, Honolulu (USA)) ; Lee, Chihming Wang (National Taiwan Univ. Taipei (Taiwan)) |
| Publication Date | 1988 Mar 01 |
| OSTI Identifier | OSTI ID: 5255482 |
| Other Number(s) | ISSN0016-7037; CODEN: GCACA |
| Resource Type | Journal Article |
| Resource Relation | Geochimica et Cosmochimica Acta ; Vol/Issue: 52:3 |
| Subject | 580000 -- Geosciences; SCHISTS-- ISOTOPE RATIO;SCHISTS-- PETROGENESIS;SERPENTINITES-- ISOTOPE RATIO;SERPENTINITES-- PETROGENESIS;TAIWAN-- SCHISTS;TAIWAN-- SERPENTINITES; CHEMICAL COMPOSITION;DIOPSIDE;GEOCHEMISTRY;MAGMATISM;METAMORPHISM;MINERALOGY;OXYGEN 18 |
| Related Subject | ASIA;CHEMISTRY;EVEN-EVEN NUCLEI;ISLANDS;ISOTOPES;LIGHT NUCLEI;METAMORPHIC ROCKS;MINERALS;NUCLEI;OXYGEN COMPOUNDS;OXYGEN ISOTOPES;PYROXENES;ROCKS;SILICATE MINERALS;SILICATES;SILICON COMPOUNDS;STABLE ISOTOPES |
| Description/Abstract | Metasomatic nephrite deposits (i.e., rodingites) occur between serpentinites and muscovite-quartz schist in the Fengtien area, eastern Taiwan.^The {delta}{sup 18}O values of nephrite range from +4.5 to +5.3{per thousand} and the {delta}D values, from {minus}33 to {minus}68{per thousand}.^The narrow range in the {delta}{sup 18}O values and wide variation in the {delta}D values indicate low water/rock ratios and multiple origins of the ambient H{sub 2}O during nephrite formation.^The ultimate sources of the ambient H{sub 2}O are largely sea water for the early nephrite and meteoric water for the late nephrite.^The temperature of nephrite formation is 320-420{degree}C: the estimated O-isotopic fractionation between nephrite (tremolite) and serpentine (antigorite) is 1.0 {plus minus} 0.2{per thousand} in this temperature range.^Diopsidefels and epidotite are two other kinds of rodingite in the deposits.^The {delta}{sup 18}O values of diopside from diopsidefels range from +3.7 to +4.5{per thousand}, the {delta}D values of clinozoisite from epidotite range from {minus}31 to {minus}34{per thousand} and the {delta}{sup 18}O value of one clinozoisite analyzed is +3.9{per thousand}.^These data suggest that most diopsidefels formed in isotopic equilibrium with nephrite and that clinozoisite was not in isotopic equilibrium with either nephrite of diopsidefels.^O-isotope compositions of both nephrite and diopsidefels cannot give conclusive evidence of their parental rocks.^Circumstantial evidence, however, implies that the nephrite is derived from serpentinite whereas diopsidefels formed from unaltered ultramafic rocks. |
| Country of Publication | United States |
| Language | English |
| Format | Pages: 593-602 |
| System Entry Date | 2001 May 13 |
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