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| Content Provider | Springer Nature Link |
|---|---|
| Author | Chen, JunBing Zeng, ZhiGang |
| Copyright Year | 2007 |
| Abstract | Modal composition and mineral composition of harzburgites from the southern Mariana fore-arc show that they are highly refractory. There are a few modals of clinopyroxene (0.7 vol %) in harzburgites. Two types of amphibole are found in these harzburgites: magnesiohornblende accompanied by clinopyroxene with higher Al$_{2}$O$_{3}$ content (>7%) and lower Mg$^{#}$; tremolite around orthopyroxene with lower Al$_{2}$O$_{3}$ content (< 2%) and higher Mg$^{#}$. Trace element of clinopyroxene and two types of amphibole are analyzed. Primitive mantle-normalised REE patterns for clinopyroxene and magnesio hornblende are very similar and both show HREE enrichment relative to LREE, while magnesiohornblende has higher content of trace element than clinopyroxene. The contents of trace element of tremolite are much lower than those of magnesiohornblende. Clinopyroxene shows enrichment of most of the trace element except HREE and Ti relative to clinopyroxene in abyssal peridotites. Petrology and trace element characteristic of clinopyroxene and two types of amphibole indicate that southern Mariana fore-arc harzburgites underwent two stages of metasomatism. The percolation of a hydrous melt led to mobility of Al, Ca, Fe, Mg, Na, and large amounts of trace element. LILE and LREE can be more active in hydrous melt than HREE and Ti, and the activities of most of the trace element except some of LILE are influenced by temperature and pressure. |
| Starting Page | 1005 |
| Ending Page | 1012 |
| Page Count | 8 |
| File Format | |
| ISSN | 10069313 |
| Journal | Science in China Series D: Earth Sciences |
| Volume Number | 50 |
| Issue Number | 7 |
| e-ISSN | 18622801 |
| Language | English |
| Publisher | Science in China Press |
| Publisher Date | 2007-01-01 |
| Publisher Place | Beijing |
| Access Restriction | Subscribed |
| Subject Keyword | trace element clinopyroxene amphibole harzburgite metasomatism Mariana Geosciences |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences |
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