Calculated phase relations in the system Na(2)O-CaO-K(2)O-FeO-MgO-Al(2)O(3)-SiO(2)-H(2)O with applications to UHP eclogites and whiteschists
文献类型：期刊论文
| 作者 | Yang, Jian-Jun; Powell, Roger |
| 刊名 | JOURNAL OF PETROLOGY
 |
| 出版日期 | 2006-10-01 |
| 卷号 | 47期号:10页码:2047-2071 |
| 关键词 | dehydration eclogites phase relations THERMOCALC UHP metamorphism whiteschists |
| ISSN号 | 0022-3530 |
| DOI | 10.1093/petrology/egl036 |
| 文献子类 | Article |
| 英文摘要 | Pressure-temperature grids in the system Na(2)O-CaO-K(2)O-FeO-MgO- Al(2)O(3)-SiO(2)-H(2)O and its subsystems have been calculated in the range 15-45 kbar and 550-900 degrees C, using an internally consistent thermodynamic dataset and new thermodynamic models for amphibole, white mica, and clinopyroxene, with the software THERMOCALC. Minerals considered for the grids include garnet, omphacite, diopside, jadeite, hornblende, actinolite, glaucophane, zoisite, lawsonite, kyanite, coesite, quartz, talc, muscovite, paragonite, biotite, chlorite, and plagioclase. Compatibility diagrams are used to illustrate the phase relationships in the grids. Coesite-bearing eclogites and a whiteschist from China are used to demonstrate the ability of pseudosections to model phase relationships in natural ultrahigh-pressure metamorphic rocks. Under water-saturated conditions, chlorite-bearing assemblages in Mg- and Al-rich eclogites are stable at lower temperatures than in Fe-rich eclogites. The relative temperature stability of the three amphiboles is hornblende > actinolite > glaucophane (amphibole names used sensu lato). Talc-bearing assemblages are stable only at low temperature and high pressure in Mg- and Al-rich eclogites. For most eclogite compositions, talc coexists with lawsonite, but not zoisite, in the stability field of coesite. Water content contouring of pressure-temperature pseudosections, along with appropriate geotherms, provides new constraints concerning dehydration of such rocks in subducting slabs. Chlorite and lawsonite are two important H(2)O-carriers in subducting slabs. Depending on bulk composition and pressure-temperature path, amphibole may or may not be a major H(2)O-carrier to depth. In most cases, dehydration to make ultrahigh-pressure eclogites takes place gradually, with H(2)O content controlled by divariant or higher variance assemblages. Therefore, fluid fluxes in subduction zones are likely to be continuous, with the rate of dehydration changing with changing pressure and temperature. Further, eclogites of different bulk compositions dehydrate differently. Dehydration of Fe-rich eclogite is nearly complete at relatively shallow depth, whereas Mg- and Al-rich eclogites dehydrate continuously down to greater depth. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; MINERAL EQUILIBRIA ; SOLID-SOLUTIONS ; PETROLOGICAL CALCULATIONS ; DEHYDRATION REACTIONS ; MIXING PROPERTIES ; PAM PENINSULA ; NEW-CALEDONIA ; NW CHINA ; SUBDUCTION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000240692500007 |
| 出版者 | OXFORD UNIV PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66384]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Yang, Jian-Jun |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Univ Melbourne, Sch Earth Sci, Parkville, Vic 3010, Australia |
| 推荐引用方式 GB/T 7714 | Yang, Jian-Jun,Powell, Roger. Calculated phase relations in the system Na(2)O-CaO-K(2)O-FeO-MgO-Al(2)O(3)-SiO(2)-H(2)O with applications to UHP eclogites and whiteschists[J]. JOURNAL OF PETROLOGY,2006,47(10):2047-2071. |
| APA | Yang, Jian-Jun,&Powell, Roger.(2006).Calculated phase relations in the system Na(2)O-CaO-K(2)O-FeO-MgO-Al(2)O(3)-SiO(2)-H(2)O with applications to UHP eclogites and whiteschists.JOURNAL OF PETROLOGY,47(10),2047-2071. |
| MLA | Yang, Jian-Jun,et al."Calculated phase relations in the system Na(2)O-CaO-K(2)O-FeO-MgO-Al(2)O(3)-SiO(2)-H(2)O with applications to UHP eclogites and whiteschists".JOURNAL OF PETROLOGY 47.10(2006):2047-2071. |
入库方式： OAI收割
来源：地质与地球物理研究所
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