干旱区生态环境知识资源中心(Arid): Neoproterozoic and Cretaceous mantle oxidation states: Controls Chock for and heterogeneity through time

Arid

DOI	10.1016/j.lithos.2020.105375
	Neoproterozoic and Cretaceous mantle oxidation states: Controls Chock for and heterogeneity through time
	Ali, Rabea A. M.1; Maurice, Ayman E.2; Pitcairn, Lain K.3; Ahmed, Ahmed H.2,4; Azer, Mokhles K.5; Boskabadi, Arman 3,6; Bakhit, Bottros R.1; Shahien, Mohamed G.1
通讯作者	Ali, Rabea A. M.
来源期刊	LITHOS
ISSN	0024-4937
EISSN	1872-6143
出版年	2020
卷号	356
英文摘要	To estimate the oxygen fugacity (fO(2)) of the Neoproterozoic and Cretaceous suprasubduction zone mantle, and to evaluate the possible secular changes in the upper mantle oxidation state, the compositions of spinel, olivine and orthopyroxene of Neoproterozoic (Egypt and Saudi Arabia) and late Cretaceous (Iran) mantle rocks were determined. For accurate estimation fO(2), spinel ferric iron was calculated after correcting the electron microprobe data using a set of spine! standards for which the ferric iron content was measured by Mossbauer spectroscopy. The Neoproterozoic samples record strongly heterogenous fO(2) values ranging from moderately oxidized (FMQ +0.54) to ultra-reduced (FMQ-4.73) for harzburgites, from highly oxidized (FMQ+1.49) to moderately reduced (FMQ-0.60) for dunites as well as one highly reduced (FMQ-1.61) value for chromitite. Such heterogeneity is not apparent in the late Cretaceous harzburgites that record fO(2) values ranging from slightly oxidized (FMQ +0.45) to moderately reduced (FMQ -0.85). The fO(2) of the Neoproterozoic forearc mantle is most easily explained by melt-mantle interaction and deep-mantle recycling, while that of the late Cretaceous forearc mantle can be attributed to variable degrees of melt-mantle interaction. The estimated fO(2 )values of Neoproterozoic/Cretaceous mantle unaffected by melt-rock interaction and deep-mantle recycling, and published values of Precambrian and Modern mantle suggest a consistent upper mantle oxidation state from Proterozoic to present day. (C) 2020 Elsevier B.V. All rights reserved.
英文关键词	Suprasubduction zone ophiolites Oxygen fugacity Mantle oxidation state Mantle heterogeneity
类型	Article
语种	英语
国家	Egypt ; Sweden ; Saudi Arabia ; USA
开放获取类型	Bronze
收录类别	SCI-E
WOS记录号	WOS:000520941500019
WOS关键词	MARIANA FORE-ARC ; ULTRAHIGH-PRESSURE CHROMITITES ; SPINEL OXYGEN GEOBAROMETER ; SOUTH EASTERN DESERT ; RARE-EARTH PATTERNS ; C-O-H ; PODIFORM CHROMITITES ; REDOX STATE ; PERIDOTITE XENOLITHS ; LUOBUSA OPHIOLITE
WOS类目	Geochemistry & Geophysics ; Mineralogy
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/315148
作者单位	1.Beni Suef Univ, Geol Dept, Fac Sci, Bani Suwayf 62521, Egypt; 2.Helwan Univ, Fac Sci, Geol Dept, Cairo 11790, Egypt; 3.Stockholm Univ, Dept Geol Sci, Stockholm, Sweden; 4.King Abdulaziz Univ, Fac Earth Sci, Jeddah, Saudi Arabia; 5.Natl Res Ctr, Geol Sci Dept, Cairo, Egypt; 6.Univ Texas Dallas, Geosci Dept, Richardson, TX 75083 USA
推荐引用方式 GB/T 7714	Ali, Rabea A. M.,Maurice, Ayman E.,Pitcairn, Lain K.,et al. Neoproterozoic and Cretaceous mantle oxidation states: Controls Chock for and heterogeneity through time[J],2020,356.
APA	Ali, Rabea A. M..,Maurice, Ayman E..,Pitcairn, Lain K..,Ahmed, Ahmed H..,Azer, Mokhles K..,...&Shahien, Mohamed G..(2020).Neoproterozoic and Cretaceous mantle oxidation states: Controls Chock for and heterogeneity through time.LITHOS,356.
MLA	Ali, Rabea A. M.,et al."Neoproterozoic and Cretaceous mantle oxidation states: Controls Chock for and heterogeneity through time".LITHOS 356(2020).