Ultra-depleted melts from Kamchatkan ophiolites: Evidence for the interaction of the Hawaiian plume with an oceanic spreading center in the Cretaceous?

Portnyagin, Maxim; Hoernle, Kaj; Savelyev, D. P.

doi:10.1016/j.epsl.2009.07.042

Cited by 26 publications

(19 citation statements)

References 56 publications

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“…The alternative explanation assumes mid-Cretaceous (Albian -Cenomanian) age (Palechek et al, 2010) for most rocks, and that the KM ophiolite represents magmatism and sedimentation in the former Kula-Pacific spreading center (Khotin and Shapiro, 2006;Portnyagin et al, 2005;Saveliev, 2003). The age and compositions of the ophiolite is consistent with the interpretation that it is the earliest expression of interaction of the Hawaiian "plume" and paleo-spreading center (Batanova et al, 2014;Portnyagin et al, 2009;Portnyagin et al, 2008;Portnyagin et al, 2005;Saveliev, 2003).…”

Section: Geological Setting and Samplessupporting

confidence: 80%

“…The volcanic rocks in the upper part of the KM ophiolite are basalts belonging to the tholeiitic, sub-alkaline and alkaline series (e.g., Fedorchuk, 1992;Portnyagin et al, 2008;Portnyagin et al, 2005;Saveliev, 2003). The enriched tholeiites are geochemically similar to those from the neighboring Meiji and Detroit Seamounts (Portnyagin et al, 2008), whereas ultradepleted melt compositions contributed to N-MORB tholeiitic basalts (Portnyagin et al, 2009).…”

Section: Geological Setting and Samplesmentioning

confidence: 67%

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Immiscible sulfide melts in primitive oceanic magmas: Evidence and implications from picrite lavas (Eastern Kamchatka, Russia)

Savelyev

Kamenetsky

Danyushevsky

et al. 2018

American Mineralogist

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Silicate-sulfide liquid immiscibility in mantle-derived magmas has important control on the budget of siderophile and chalcophile metals, and is considered to be instrumental in the origin orthomagmatic sulfide deposits. Data on primitive sulfide melts in natural samples, even those This is a preprint, the final version is subject to change, of the American Mineralogist (MSA) Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Geological Setting and Samplessupporting

confidence: 80%

Section: Geological Setting and Samplesmentioning

confidence: 67%

Immiscible sulfide melts in primitive oceanic magmas: Evidence and implications from picrite lavas (Eastern Kamchatka, Russia)

Savelyev

Kamenetsky

Danyushevsky

et al. 2018

American Mineralogist

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“…It was suggested that these Upper Cretaceous Hawaiian hotspot‐related volcanics were accreted below the Kronotsky arc sometime during its intraoceanic activity (Khotin & Shapiro, ; Lander & Shapiro, ; Portnyagin et al, ). A subsequent geochemical study of ultradepleted melts in MORB‐like basalts obtained from a serpentinite mélange in the Kamchatka Mys ophiolite complex suggested that the mid‐ocean ridge at which the ophiolite formed may have had interaction with the Hawaiian hotspot during the middle‐Cretaceous, that is, before subduction started below the Kronotsky arc (Batanova et al, ; Portnyagin et al, ). This suggests that the mid‐Cretaceous oceanic crust on which Kronotsky arc formed, originated from a spreading center near the Hawaiian mantle plume.…”

Section: Reviewmentioning

confidence: 99%

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

2019

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The Eocene (~50–45 Ma) major absolute plate motion change of the Pacific plate forming the Hawaii‐Emperor bend is thought to result from inception of Pacific plate subduction along one of its modern western trenches. Subduction is suggested to have started either spontaneously, or result from subduction of the Izanagi‐Pacific mid‐ocean ridge, or from subduction polarity reversal after collision of the Olyutorsky arc that was built on the Pacific plate with NE Asia. Here we provide a detailed plate‐kinematic reconstruction of back‐arc basins and accreted terranes in the northwest Pacific region, from Japan to the Bering Sea, since the Late Cretaceous. We present a new tectonic reconstruction of the intraoceanic Olyutorsky and Kronotsky arcs, which formed above two adjacent, oppositely dipping subduction zones at ~85 Ma within the north Pacific region, during another Pacific‐wide plate reorganization. We use our reconstruction to explain the formation of the submarine Shirshov and Bowers Ridges and show that if marine magnetic anomalies reported from the Aleutian Basin represent magnetic polarity reversals, its crust most likely formed in an ~85‐ to 60‐Ma back‐arc basin behind the Olyutorsky arc. The Olyutorsky arc was then separated from the Pacific plate by a spreading ridge, so that the ~55‐ to 50‐Ma subduction polarity reversal that followed upon Olyutorsky‐NE Asia collision initiated subduction of a plate that was not the Pacific. Hence, this polarity reversal may not be a straightforward driver of the Eocene Pacific plate motion change, whose causes remain enigmatic.

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“…Портнягина с соавторами [Портнягин и др., 2005;Portnyuagin et al, 2008Portnyuagin et al, , 2009], ба зальты и кремнисто-вулканогенные отложения смагинской свиты, входящие в состав офиолитовой ассо циации вместе с перидотитами, формировались под влиянием плюма в аномальном сегменте рифта Тихого океана.…”

Section: краткий геологический очеркunclassified

“…Мантийный плюм мог обеспечить аномально высокие потенциальные температуры мантии, что привело к началу плавления мантийной колонны на больших глубинах. Присутствие в офиолитовой ассоциации Камчатского Мыса базальтов, предположительно образованных под влиянием Гавайского мантийного плюма в Тихоокеанской плите [Портнягин и др., 2005;Portnyuagin et al, 2008Portnyuagin et al, , 2009, свидетельствует о реальности такой возможности.…”

Section: обсуждение результатовunclassified

Peridotites From the Kamchatsky Mys: Evidence of Oceanic Mantle Melting Near a Hotspot

2014

GiG

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Перидотитовый комплекс офиолитов п-ова Камчатский Мыс включает шпинелевые лерцолиты, клинопироксенсодержащие гарцбургиты и гарцбургиты.Установлены закономерные ковариации составов оливина, хромшпинели и клинопироксена, характерные для перидотитов, образованных при различных степенях плавления от 8 до более 22 %. Состав клинопироксена перидотитов Камчатского Мыса отличается от такового и в абиссальных, и в надсубдукционных мантийных комплексах: по сравнению с абиссальными перидотитами клинопирок-сен лерцолитов обеднен легкими редкоземельными элементами. Клинопироксен из гарцбургитов имеет крайне низкое содержание легких РЗЭ и стронция, что отличает его от клинопироксена надсубдукцион-ных перидотитов. На основании этих характеристик сделано предположение о том, что экстремальное обеднение мантийных пород базальтовым компонентом осуществлялось в сегменте срединного хребта, расположенного вблизи «горячей» точки, возможно, Протогавайского плюма, которая инициировала по-вышенные степени плавления конвектирующей мантии -источника базальтов срединно-океанических хребтов. Офиолиты, лерцолит, гарцбургит, клинопироксен, Камчатка, Протогавайский мантийный плюм. PERIDOTITES FROM THE KAMCHATSKY MYS: EVIDENCE OF OCEANIC MANTLE MELTING NEAR A HOTSPOT V.G. Batanova, Z.E. Lyaskovskaya, G.N. Savelieva, and A.V. SobolevA suite of mantle peridotites sampled in the Kamchatsky Mys includes spinel lherzolite, clinopyroxe nebearing harzburgite, and harzburgite. Mineral chemistry of olivine, chromian spinel, and clinopyroxene show strongly correlated element patterns typical of peridotite formed by 8% to more than 22% partial melting. Clinopyroxene in the Kamchatka peridotites is compositionally different from that of both abyssal and suprasubduction varieties: Clinopyroxene in lherzolite is depleted in LREE relative to abyssal peridotite and that in harzburgite has very low LREE and Sr unlike the subduction-related counterpart. These composition features indicate that the rocks ultra-depleted in basaltic components originated in the vicinity of a hotspot, possibly, proto-Hawaiian plume, which provided high temperature and melting degree of the MORB source mantle at mid-ocean ridge.

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Ultra-depleted melts from Kamchatkan ophiolites: Evidence for the interaction of the Hawaiian plume with an oceanic spreading center in the Cretaceous?

Cited by 26 publications

References 56 publications

Immiscible sulfide melts in primitive oceanic magmas: Evidence and implications from picrite lavas (Eastern Kamchatka, Russia)

Immiscible sulfide melts in primitive oceanic magmas: Evidence and implications from picrite lavas (Eastern Kamchatka, Russia)

Reconstruction of Subduction and Back‐Arc Spreading in the NW Pacific and Aleutian Basin: Clues to Causes of Cretaceous and Eocene Plate Reorganizations

Peridotites From the Kamchatsky Mys: Evidence of Oceanic Mantle Melting Near a Hotspot

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