Multi-Stage Evolution of the Oceanic Lithosphere beneath Heard Island, Southern Indian Ocean

doi:10.1093/petrology/egae106

	Multi-Stage Evolution of the Oceanic Lithosphere beneath Heard Island, Southern Indian Ocean
	Abersteiner, Adam 1,2,3; Beier, Christoph 1; Genske, Felix 4; Berndt, Jasper 4; Kamenetsky, Maya 5; Goemann, Karsten 6; Nekrylov, Nikolai 7; Kamenetsky, Vadim S.8
	2024-10-15
发表期刊	JOURNAL OF PETROLOGY
ISSN	0022-3530
卷号	65 期号:10 页码:20
通讯作者	Abersteiner, Adam([email protected])
摘要	The Kerguelen Plateau is the second biggest submarine large igneous province (LIP) on Earth, however, the nature of the lithospheric mantle source underlying it remains poorly constrained. In this contribution, we provide novel insights into the oceanic lithospheric mantle underlying Heard Island (southern Indian Ocean), which represents the most recent and active phase of volcanic activity (<1 Ma) in the Kerguelen Plateau. We present petrographic and geochemical data for a suite of spinel-bearing harzburgite xenoliths hosted in basanite lavas and provide detailed constraints for distinguishing in situ mantle metasomatism from post-entrapment modification of the xenoliths following interaction with the host magma. We demonstrate that the xenolith mineral compositions and textures preserve a complex multistage history of different modal and cryptic transformations that occurred in the mantle due to: i) high degrees of partial melting that produced highly refractory whole-rock Mg# (Mg# = (Mg + Fe)/Mg x 100; 88-92), major element (FeO/MgO = 0.17) and mineral compositions (e.g. highly forsteritic olivine; Fo = (Mg + Fe)/Mg x 100; 91-92 mol %); ii) solid-state re-equilibration reactions during decompression that caused exsolution of clinopyroxene and Cr-spinel from xenolith orthopyroxene to form symplectite intergrowths; iii) cryptic metasomatism affecting the composition of xenolith clinopyroxene (i.e. enrichment in Na, Th, U and light rare earth elements, and depletion in Rb, Nb, Zr, Hf and Ti) due to interaction with carbonatitic melts in the mantle. Mantle fragments, entrapped by ascending basanite magmas as xenoliths were further modified by reactions with the host magma. This resulted in the partial dissolution of mantle orthopyroxene and replacement by newly formed and compositionally distinct assemblages of clinopyroxene (Mg# 87-91), olivine (Fo: 81-88 mol %) and Cr-spinel (i.e. 'wehrlitisation' of the xenoliths). This study highlights the utility of combining petrography and mineral chemistry to decipher the complex and sometimes overprinting and masking effects that different processes (e.g. melting events, metasomatism) exert on the lithospheric mantle, as well as constrain the processes that modify the xenoliths during transport towards the surface.
关键词	melting metasomatism melt-rock interaction xenolith carbonatite
DOI	10.1093/petrology/egae106
收录类别	SCI
语种	英语
资助项目	K.H. Renlund Foundation fund (AA); Institute of Sustainability, Energy and Resources (University of Adelaide) Future Making Fellow grant; Visiting Scientist Award by the Chinese Academy of Sciences (VSK)
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:001341448200001
出版者	OXFORD UNIV PRESS
WOS关键词	UPPER-MANTLE BENEATH ; SPINEL-PYROXENE SYMPLECTITE ; EIFEL VOLCANIC FIELD ; MID-ATLANTIC RIDGE ; PERIDOTITE XENOLITHS ; CARBONATITE METASOMATISM ; KERGUELEN ISLANDS ; CANARY-ISLANDS ; TRACE-ELEMENT ; WEST EIFEL
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/199532
专题	深海极端环境与生命过程研究中心
通讯作者	Abersteiner, Adam
作者单位	1.Univ Helsinki, Dept Geosci & Geog, Res Programme Geol & Geophys GeoHel, POB 64, FIN-00014 Helsinki, Finland 2.Univ Adelaide, Inst Sustainabil Energy & Resources, Adelaide, SA 5005, Australia 3.Univ Adelaide, Sch Phys Chem & Earth Sci, Adelaide, SA 5005, Australia 4.Univ Munster, Inst Mineral, Corrensstr 24, D-48149 Munster, Germany 5.Univ Tasmania, Sch Nat Sci, Hobart, Tas 7001, Australia 6.Univ Tasmania, Cent Sci Lab, Hobart, Tas 7001, Australia 7.Inst Geol Sci NAS RA, Yerevan 0019, Armenia 8.Chinese Acad Sci, Inst Oceanol, Ctr Deep Sea Res, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Abersteiner, Adam,Beier, Christoph,Genske, Felix,et al. Multi-Stage Evolution of the Oceanic Lithosphere beneath Heard Island, Southern Indian Ocean[J]. JOURNAL OF PETROLOGY,2024,65(10):20.
APA	Abersteiner, Adam.,Beier, Christoph.,Genske, Felix.,Berndt, Jasper.,Kamenetsky, Maya.,...&Kamenetsky, Vadim S..(2024).Multi-Stage Evolution of the Oceanic Lithosphere beneath Heard Island, Southern Indian Ocean.JOURNAL OF PETROLOGY,65(10),20.
MLA	Abersteiner, Adam,et al."Multi-Stage Evolution of the Oceanic Lithosphere beneath Heard Island, Southern Indian Ocean".JOURNAL OF PETROLOGY 65.10(2024):20.