Eclogitic metapelites in the western segment of the north Qaidam;Mountains: Evidence on "in situ" relationship between eclogite and its;country rock

doi:10.1360/02yd0311

	Eclogitic metapelites in the western segment of the north Qaidam;Mountains: Evidence on "in situ" relationship between eclogite and its;country rock
	Zhang, JX; Meng, FC; Yang, JS
刊名	SCIENCE IN CHINA SERIES D-EARTH SCIENCES
	2004
卷号	47 期号:12 页码:1102-1112
关键词	eclogitic metapelites in situ tectonic emplacement
ISSN号	1006-9313
DOI	10.1360/02yd0311
英文摘要	In Yuka-Luofengpo area of the north Qaidam Mountains, eclogitic metapelites are recognized. The metapelites enclosed lenses of eclogites, and locally intercalated with eclogites. Their typical mineral assemblages are garnet + kyanite + chloritoid + phengite + quartz + rutile. Strong growth zoning is preserved in garnets of metapelites, and phengite contains up to 3.4 Si per formula units. The petrographic observations and textural relations testify to the following sequence of mineral assemblages connected to three metamorphic stage: (1) Girt + Chll + Cldl + Phel +/- Stl + Qtz; (2) Grt + Ky + Phell +/- Cldll + Qtz; and (3) Grt + Cldlll + Chlll + Phelll + Stll +/- ky + Qtz. Applying THERMOCALC Program, Grt-Phe thermometer and Grt-Ky-Phe-Qtz barometry, P-T conditions for three metamorphic stages were obtained: P=1.07 +/- 0.31GPa, T=564 +/- 22 degreesC (prograde stage); P=2.3-3.1GPa, T=615-700 degreesC (peak stage); and P=1.22 +/- 0.26GPa, T=581 +/- 20degreesC (retrograde stage). A hairpin shape P-T path similar to that of adjacent eclogite is inferred. In combination with eclogitic mineral relics in marbles and orthogneisses enclosing eclogites, we thought that the relationship between eclogites and country rocks is "in situ" rather than "tectonic emplacement".
学科主题	变质岩岩石学
WOS关键词	HIGH-PRESSURE METAPELITES ; CONSISTENT THERMODYNAMIC DATA ; ALTUN ; MOUNTAINS ; PHASE-RELATIONS ; ALTYN-TAGH ; CHINA ; ALPS ; METAMORPHISM ; PETROLOGY ; BEARING
WOS研究方向	Geology
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000226822400005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37749]
专题	中国地质科学院地质研究所
作者单位	Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China.
推荐引用方式 GB/T 7714	Zhang, JX,Meng, FC,Yang, JS. Eclogitic metapelites in the western segment of the north Qaidam;Mountains: Evidence on "in situ" relationship between eclogite and its;country rock[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2004,47(12):1102-1112.
APA	Zhang, JX,Meng, FC,&Yang, JS.(2004).Eclogitic metapelites in the western segment of the north Qaidam;Mountains: Evidence on "in situ" relationship between eclogite and its;country rock.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,47(12),1102-1112.
MLA	Zhang, JX,et al."Eclogitic metapelites in the western segment of the north Qaidam;Mountains: Evidence on "in situ" relationship between eclogite and its;country rock".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 47.12(2004):1102-1112.