Petrogenesis of UHP metamorphic crustal and Mande rocks from the Chinese;Continental Scientific Drilling Pre-pilot Hole 1, Sulu belt, eastern;China

doi:10.2747/0020-6814.47.11.1160

CORC > 中国地质调查局 > 中国地质调查局

	Petrogenesis of UHP metamorphic crustal and Mande rocks from the Chinese;Continental Scientific Drilling Pre-pilot Hole 1, Sulu belt, eastern;China
	Zhang, ZM 4; Xiao, YL ; Hoefs, J ; Xu, ZQ ; Liou, JG
刊名	INTERNATIONAL GEOLOGY REVIEW
	2005
卷号	47 期号:11 页码:1160-1177
ISSN号	0020-6814
DOI	10.2747/0020-6814.47.11.1160
英文摘要	The Pre-pilot Hole No. 1 of the Chinese Continental Scientific Drilling Project (CCSD-PPH1) in the southern Sulu terrane recovered a continuous core of eclogite, garnet peridotite, orthogneiss, paragneiss, and minor schist and quartzite. Geochemical characteristics indicate that the garnet peridotite was derived from depleted mantle; all other rock types are metamorphosed supracrustal rocks with continental affinities. The eclogite consists of garnet, omphacite, phengite, quartz (coesite), amphibole, rutile, and zircon; P-T estimates of peak metamorphism are 785-820 degrees C and >2.7 to 3.7 GPa. The gneisses show common amphibolite-facies mineral assemblages consisting of plagioclase, K-feldspar, muscovite, and quartz, with minor garnet, epidote (or zoisite), and biotite; coesite inclusions in zircon indicate that the gneisses together with eclogites were subjected to an early UHP metamorphism prior to amphibolite-facies retrogression. The Garnet peridotites show porphyroblastic textures, and consist mainly of garnet, clinopyroxene, orthopyroxene, and olivine with minor phlogopite. Garnet and clinopyroxene porphyroblasis show significant compositional zoning. Applying relevant geothermobarometers, core compositions of the minerals indicate P-T conditions of 6.0-7.0 GPa and 1100-1200 degrees C. For the rim, similar or slightly higher P-T conditions compared to the eclogites were obtained. We suggest that the former represent crystallization conditions of garnet peridotite in the upper mantle, whereas the latter reflect reequilibrium conditions during incorporation of mantle rocks into the subducted slab. We conclude that the garnet peridotite may have been derived from the mantle wedge above the subduction zone. If so, these mantle-derived rocks were sandwiched between continental-derived country rocks.
学科主题	变质岩岩石学
WOS关键词	HIGH-PRESSURE ECLOGITES ; GARNET PERIDOTITES ; ALPE-ARAMI ; MINERAL ; INCLUSIONS ; DABIE MOUNTAINS ; GEOTHERMOMETER ; PETROLOGY ; OLIVINE ; THERMOBAROMETRY ; CALIBRATION
WOS研究方向	Geology
语种	英语
出版者	V H WINSTON & SON INC
WOS记录号	WOS:000232750200005
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37997]
专题	中国地质调查局
作者单位	1.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China. 2.Univ Gottingen, Geosci Ctr, D-37077 Gottingen, Germany. 3.Stanford Univ, Dept Geog & Environm Sci, Stanford, CA 94305 USA. 4.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, ZM,Xiao, YL,Hoefs, J,et al. Petrogenesis of UHP metamorphic crustal and Mande rocks from the Chinese;Continental Scientific Drilling Pre-pilot Hole 1, Sulu belt, eastern;China[J]. INTERNATIONAL GEOLOGY REVIEW,2005,47(11):1160-1177.
APA	Zhang, ZM,Xiao, YL,Hoefs, J,Xu, ZQ,&Liou, JG.(2005).Petrogenesis of UHP metamorphic crustal and Mande rocks from the Chinese;Continental Scientific Drilling Pre-pilot Hole 1, Sulu belt, eastern;China.INTERNATIONAL GEOLOGY REVIEW,47(11),1160-1177.
MLA	Zhang, ZM,et al."Petrogenesis of UHP metamorphic crustal and Mande rocks from the Chinese;Continental Scientific Drilling Pre-pilot Hole 1, Sulu belt, eastern;China".INTERNATIONAL GEOLOGY REVIEW 47.11(2005):1160-1177.