The age and history of the lithospheric mantle of the Siberian craton: Re–Os and PGE study of peridotite xenoliths from the Obnazhennaya kimberlite

Ionov, Dmitri A.; Carlson, Richard W.; Doucet, Luc S.; Golovin, Alexander V.; Oleinikov, Oleg O.B.

doi:10.1016/j.epsl.2015.07.007

Cited by 59 publications

(33 citation statements)

References 55 publications

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“…The coincidence of Re/Os model age peaks from mantle xenoliths with zircon age peaks at 2700 and 1900 Ma records the existence of mantle events corresponding in time to the proposed crustal production events (Pearson et al, 2007;Ionov et al, 2015). Episodic emplacement of LIPs and eruption of komatiite (Condie et al, 2015b) at the times of the crustal age peaks provides further evidence of a mantle origin.…”

Section: Discussionmentioning

confidence: 70%

Zircon age peaks: Production or preservation of continental crust?

et al. 2017

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Zircon age peaks are commonly interpreted either as crustal production peaks or as selective preservation peaks of subduction-produced crust selectively preserved during continent-continent collision. We contribute to this ongoing debate, using the Nd isotopic compositions of felsic igneous rocks and their distribution during the accretionary and collisional phases of orogens. The proportion of juvenile input into the continental crust is estimated with a mixing model using arc-like mantle and reworked continental crust end members. Orogen length and duration proxies for juvenile crustal volume show that the amount of juvenile crust produced and preserved at zircon age peaks during the accretionary phase of orogens is ≥3 times that preserved during the collisional phase of orogens. The fact that most juvenile crust is both produced and preserved during the accretionary phase of orogens does not require craton collisions for its preservation, thus favoring the interpretation of zircon age peaks as crustal production peaks. Most juvenile continental crust older than 600 Ma is produced and preserved before final supercontinent assembly and does not require supercontinent assembly for its preservation. Episodic destabilization of a compositionally heterogeneous layer at the base of the mantle may produce mantle plume events leading to enhanced subduction and crustal production. Our Nd isotope model for cumulative continental growth based on juvenile crust proxies for the past 2.5 b.y. suggests a step-like growth curve with rapid growth in accretionary orogens at the times of zircon age peaks.

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Section: Discussionmentioning

confidence: 70%

Zircon age peaks: Production or preservation of continental crust?

et al. 2017

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“…The data of the abyssal peridotites are from Alard et al (), Brandon et al (), Harvey et al (), Liu et al (2008), and Snow and Reisberg (). The data of SCLM xenoliths are from Becker et al (), Chesley et al (), Meisel et al (, ), Fischer‐Gödde et al (), Ionov et al (); Ionov, Carlson, et al (); Ionov, Doucet, et al (), Pearson et al (), Pernet‐Fisher et al (), and Sun et al (). The data of subarc peridotites are from Brandon et al (), Kepezhinskas et al (), Widom et al (), and Saha et al ().…”

Section: Discussionmentioning

confidence: 99%

Ancient Refertilization Process Preserved in the Plagioclase Peridotites: An Example From the Shuanggou Ophiolite, Southwest China

Zhong

Chu

et al. 2020

JGR Solid Earth

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Petrology, geochemistry, platinum group elements (PGEs: Os, Ir, Ru, Rh, Pt, and Pd), and Re-Os isotope data of harzburgites and plagioclase lherzolites from the Shuanggou ophiolite (southwest China) are presented in this study, in order to determine whether ancient refertilization process can be preserved in ophiolitic plagioclase peridotites. The harzburgites in the Shuanggou ophiolite are divided into two groups: (1) the Group-1 harzburgites have 187 Os/ 188 Os ratios (0.12297-0.12727) and PGE abundances similar to those of oceanic peridotites, thereby representing the convecting upper mantle; (2) the Group-2 harzburgites have extremely low 187 Os/ 188 Os ratios (0.11307-0.11651) with considerable fractionation in iridium group PGEs (Os, Ir, and Ru), indicative of an ancient refractory mantle in the oceanic lithosphere. The plagioclase lherzolites were formed by melt impregnation of the Group-2 harzburgites, according to the PGE compositions and the petrographic features. However, the large Os isotope difference between the lherzolites ( 187 Os/ 188 Os: 0.12470-0.12666) and the Group-2 harzburgites indicates that the refertilization process took place much earlier than the exhumation of the mantle at 0.4 Ga. In addition, clinopyroxene composition suggests that the percolating melt is different from the Shuanggou diabases and typical mid-ocean ridge basalts. This study therefore demonstrates that some plagioclase lherzolites possibly were not related to mantle exhumation beneath the spreading center but formed by much older melt impregnation processes in the mantle instead.

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“…Shown for comparison is the age distribution of kimberlites from Tappe et al, 160 Os model ages of mantle sulfides from Griffin et al, 165 which predominantly reflect the time of Archaean craton formation and the creation of strongly refractory and reducing mantle lithosphere, and for xenoliths from the Siberian craton, which show a major Paleoproterozoic lithospheric mantle formation event. 166 The successful eruption of kimberlites has been suggested to require, inter alia, metasomatic oxidative "preconditioning" of deep lithospheric pathways in the presence of diamond 167 and of shallower lithospheric levels through the precipitation of hydrous and Ti minerals from kimberlite precursors. 168 Although harzburgitic source rocks are too Fe 3+ depleted to permit substantial diamond formation by wall rock-buffered redox reactions, 47 lherzolitization accompanied by (ferrous) iron introduction may have restored sufficient redox buffering capacity to precipitate some diamonds by reduction of carbonate from small-volume melts through simultaneous oxidation of Fe 2+ to Fe 3+ of the host rock.…”

Section: Proterozoic Lherzolitic Diamond Formation: a Deep And Early mentioning

confidence: 99%