Rheological properties of mantle peridotites at Yushigou in the North;Qilian Mountains and their implications for plate dynamics

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质调查局西安地质调查中心

	Rheological properties of mantle peridotites at Yushigou in the North;Qilian Mountains and their implications for plate dynamics
	Song, SG; Su, L
刊名	ACTA GEOLOGICA SINICA-ENGLISH EDITION
	1998
卷号	72 期号:2 页码:131-+
关键词	oceanic mantle rocks rheology sea-floor spreading North Qilian Mountains
ISSN号	1000-9515
英文摘要	This paper discusses in detail the deformation textures, glide system, petrofabrics and olivine dislocation microstructures of mantle peridotites at Yushigou in the North Qilian Mountains, northwestern China. The peridotites have undergone high-pressure, high-temperature and Pow-strain rate plastic flow deformation. According to the dynamic recrystallized-grain size of olivine and the average spacing between the dislocation walls as well as the chemical composition of enstatite, the authors calculated the rheological parameters of the ancient upper mantle in the study area as follows:; temperatures 1025-1093 degrees C; pressures 3043-4278 MPa; depths 95-132 km: deviatoric stress 28-32 MPa; strain rates 0.2x10(-14)-2.13x10(-14)s(-1) and equivalent viscosities 0.45x10(20)-4.65x10(20) Pa . s. These parameters suggest that the position where plastic now took place was correspondent to the low-velocity zone beneath the oceanic lithosphere and that oceanization characterized by middle-velocity (1-3 cm/a) sea-floor spreading took place in the North Qilian Mountains during the Early Palaeozoic.
学科主题	构造地质学
WOS关键词	OLIVINE
WOS研究方向	Geology
语种	英语
出版者	GEOLOGICAL SOC CHINA
WOS记录号	WOS:000077200500001
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/37280]
专题	中国地质调查局西安地质调查中心
作者单位	CAGS, Xian Inst Geol & Mineral Resources, Xian 710054, Shaanxi, Peoples R China.
推荐引用方式 GB/T 7714	Song, SG,Su, L. Rheological properties of mantle peridotites at Yushigou in the North;Qilian Mountains and their implications for plate dynamics[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,1998,72(2):131-+.
APA	Song, SG,&Su, L.(1998).Rheological properties of mantle peridotites at Yushigou in the North;Qilian Mountains and their implications for plate dynamics.ACTA GEOLOGICA SINICA-ENGLISH EDITION,72(2),131-+.
MLA	Song, SG,et al."Rheological properties of mantle peridotites at Yushigou in the North;Qilian Mountains and their implications for plate dynamics".ACTA GEOLOGICA SINICA-ENGLISH EDITION 72.2(1998):131-+.