globalchange  > 影响、适应和脆弱性
DOI: 10.1007/s00531-014-1007-8
Scopus记录号: 2-s2.0-84900017671
论文题名:
Continental rift and oceanic protoliths of mafic-ultramafic rocks from the Kechros Complex, NE Rhodope (Greece): Implications from petrography, major and trace-element systematics, and MELTS modeling
作者: Baziotis I.; Mposkos E.; Asimow P.D.
刊名: International Journal of Earth Sciences
ISSN: 14373254
出版年: 2014
卷: 103, 期:4
起始页码: 981
结束页码: 1003
语种: 英语
英文关键词: Dyke amphibolites ; Eclogites ; Kechros complex ; MELTS modeling ; Rhodope
Scopus关键词: amphibolite ; continental crust ; continental rise ; dike ; eclogite ; fractional crystallization ; gabbro ; igneous geochemistry ; mafic rock ; peridotite ; protolith ; rare earth element ; ultramafic rock ; Eastern Macedonia and Thrace ; Greece ; Rhodope
英文摘要: The whole-rock chemistry of eclogites, partially amphibolitized eclogites, and dyke amphibolites from the metamorphic Kechros complex in the eastern Rhodope Mountains preserves evidence of the geodynamic framework for the origin of their protoliths. Major and trace-element concentrations define two distinct protolith groups for the eclogites. The low-Fe-Ti (LFT) eclogites have low-TiO2 content (<0.67 wt%), negative high field strength element anomalies, and variable enrichments in large ion lithophile elements (LILE). The rare earth element (REE) patterns are characterized by strong light-REE (LREE) enrichment and heavy-REE (HREE) depletion. The high-Fe-Ti (HFT) eclogites have small to moderate LILE enrichment and lack Nb anomalies. The REE patterns of the HFT eclogites are characterized by LREE depletion and relatively flat MREE-HREE patterns. The rock compositions and petrographic features of the LFT eclogites resemble gabbros formed in a continental rift environment with minor to moderate contamination of a mantle-derived mafic magma by continental crust, whereas the HFT eclogites resemble mafic rocks formed in extensional oceanic environments. We interpret the HFT suite to represent a later stage in an evolution from continental rift to open ocean, following the origin of the LFT suite. Dyke amphibolite compositions, except for probable SiO2 loss associated with metamorphic dehydration reactions, appear to represent liquid compositions quenched in conduits through the lower crust. MELTS modeling shows that dyke amphibolite compositions can be related to each other by fractional crystallization under strongly oxidizing conditions at ~0.5 GPa pressure, and all can be derived from a low-degree melt of modified fertile peridotite from around 1.7 GPa. Cumulates crystallized from the parental liquids of the amphibolites under oxidizing conditions may have yielded the protoliths of the HFT suite. © 2014 Springer-Verlag Berlin Heidelberg.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84900017671&doi=10.1007%2fs00531-014-1007-8&partnerID=40&md5=0cdc13579d237e46a7f498236ee2355b
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/70437
Appears in Collections:影响、适应和脆弱性
气候减缓与适应

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作者单位: Department of Mineralogy, Petrology and Economic Geology, School of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece; Department of Earth Sciences, University of Perugia, 06100 Perugia, Italy; Section of Geological Sciences, Department of Mining and Metallurgical Engineering, National Technical University of Athens, Heroon Polytechniou 9, 15780 Athens, Greece; Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA, 91125, United States

Recommended Citation:
Baziotis I.,Mposkos E.,Asimow P.D.. Continental rift and oceanic protoliths of mafic-ultramafic rocks from the Kechros Complex, NE Rhodope (Greece): Implications from petrography, major and trace-element systematics, and MELTS modeling[J]. International Journal of Earth Sciences,2014-01-01,103(4)
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