Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt
-
Altmetric Citations
Chen, Mi-Mi; Tian, Wei; Suzuki, K; Tejada, M.-L.-G.; Liu, Feng-Lin; Senda, Ryoko; Wei, C; Chen, Bin; Chu, Z.
Description
Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17% fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt...[Show more]
dc.contributor.author | Chen, Mi-Mi | |
---|---|---|
dc.contributor.author | Tian, Wei | |
dc.contributor.author | Suzuki, K | |
dc.contributor.author | Tejada, M.-L.-G. | |
dc.contributor.author | Liu, Feng-Lin | |
dc.contributor.author | Senda, Ryoko | |
dc.contributor.author | Wei, C | |
dc.contributor.author | Chen, Bin | |
dc.contributor.author | Chu, Z. | |
dc.date.accessioned | 2015-12-13T22:35:15Z | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | http://hdl.handle.net/1885/76509 | |
dc.description.abstract | Mantle-derived spinel peridotite and spinel plagioclase pyroxenite xenoliths hosted in Cenozoic alkali basalts (20Ma) are found in the Xikeer area, western Tarim Block, NW China. Based on petrographic and geochemical characteristics, the peridotite xenoliths are divided into three groups. Group 1 peridotite xenoliths have experienced high degree melt extraction (~17% fractional melting) and weak, incipient metasomatism. Group 2 and 3 peridotite xenoliths have undergone extensive silicate melt metasomatism, resulting in clinopyroxenes with spoon-shaped and highly fractionated REE patterns respectively. Although their present texture is metamorphic, the pyroxenite xenoliths were initially of metasomatic origin, with high pressure protolith mineral assemblage of orthopyroxene+clinopyroxene+spinel±olivine. Numerical modeling of the Mg-number shows that the Xikeer pyroxenites may have resulted from reaction between Group 1 peridotite and a primitive Permian picritic melt at a high melt/rock ratio (>15) and that the host basanite is incapable of being the metasomatic melt. The Re-Os isotopic systematics of the Xikeer peridotites and pyroxenites yield an apparent isochron of ~290Ma, virtually identical to the age of Tarim flood basalts. Their εNd(t=290Ma) ranges from +9.5 to +14.3, typical of convecting mantle. We propose that the Xikeer xenolith suite may have been initially formed by melt extraction from the convecting mantle and, shortly after, was refertilized by Tarim mantle plume melts during the Early Permian, a process which is referred to as mantle 'auto-refertilization'. | |
dc.publisher | Elsevier | |
dc.source | Lithos | |
dc.title | Peridotite and pyroxenite xenoliths from Tarim, NW China: Evidences for melt depletion and mantle refertilization in the mantle source region of the Tarim flood basalt | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.identifier.citationvolume | 204 | |
dc.date.issued | 2014 | |
local.identifier.absfor | 040399 - Geology not elsewhere classified | |
local.identifier.ariespublication | U3488905xPUB5321 | |
local.type.status | Published Version | |
local.contributor.affiliation | Chen, Mi-Mi, Peking University | |
local.contributor.affiliation | Tian, Wei, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Suzuki, K, Japan Agency for Marine Earth Science and Technology | |
local.contributor.affiliation | Tejada, M.-L.-G., Japan Agency for Marine-Earth Science and Technology | |
local.contributor.affiliation | Liu, Feng-Lin, Peking University | |
local.contributor.affiliation | Senda, Ryoko, Japan Agency for Marine-Earth Science and Technology | |
local.contributor.affiliation | Wei, C, Peking University | |
local.contributor.affiliation | Chen, Bin, Peking University | |
local.contributor.affiliation | Chu, Z., Chinese Academy of Sciences | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.startpage | 97 | |
local.bibliographicCitation.lastpage | 111 | |
local.identifier.doi | 10.1016/j.lithos.2014.01.005 | |
dc.date.updated | 2015-12-11T09:26:58Z | |
local.identifier.scopusID | 2-s2.0-84906793787 | |
Collections | ANU Research Publications |
Download
File | Description | Size | Format | Image |
---|---|---|---|---|
01_Chen_Peridotite_and_pyroxenite_2014.pdf | 2.17 MB | Adobe PDF | Request a copy | |
02_Chen_Peridotite_and_pyroxenite_2014.pdf | 120.3 kB | Adobe PDF | Request a copy |
Items in Open Research are protected by copyright, with all rights reserved, unless otherwise indicated.
Updated: 17 November 2022/ Responsible Officer: University Librarian/ Page Contact: Library Systems & Web Coordinator