Rutile alteration and authigenic growth in metasandstones of the Moeda Formation, Minas Gerais, Brazil – A result of Transamazonian fluid–rock interaction

Zeh, Armin; Cabral, Alexandre Raphael; Koglin, Nikola; Decker, Mareike

doi:10.1016/j.chemgeo.2018.03.007

Cited by 21 publications

(10 citation statements)

References 82 publications

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“…Именно такой тип эволюции δ 18 O представлен на рис. 34, в, в нашей статье [Mints, Dokukina, 2020a]: диаграмма «U-Pb возраст -δ 18 O» в интервале от ~2.72 до ~2.60 млрд лет демонстрирует снижение δ 18 O от 6.1 до 5.7; затем около 1.9 млрд лет назад (спустя 0.8-0.7 млрд лет) зафиксирован значительный прирост значений δ 18 O до 6.2-6.8, указывающий на участие флюидов, дренирующих осадочную толщу (по данным из [Yu et al, 2017]).…”

Section: изотопная система кислородаunclassified

“…Пористый циркон в ходе реакций растворения -переосаждения захватывает высвобождающийся Eu. Поскольку титанит является одним из главных концентраторов LREE в метагаббро [Henderson, 1980;Marks et al, 2008], а рутил, напротив, содержит исчезающие малые концентрации REE [Zeh et al, 2018], максимальные концентрации LREE и MREE в цирконе можно объяснить реакцией замещения титанита рутилом, которая связана переходом к PT-параметрам эклогитовой фации [Angiboust, Harlov, 2017;Müller et al, 2018]: высвобождаемые REE утилизируются пористым цирконом. … Как видно на рис.…”

Section: обоснование возраста эклогитовunclassified

“…34, а. Типичность обнаруженной нами закономерности подтверждают аналогичные данные для эклогитов по метагаббро-норитам (рис. 34, б, по данным из[Yu et al, 2017]). АК ищут поддержки своим выводам в статье[O'Reilly et al, 2008].…”

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Reply to Comments From S.G. Skublov, A.V. Berezin, and L.I. Salimgaraeva on the Article Authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

Mints

Dokukina

2021

Geodin. tektonofiz.

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In their research, the authors of the comments have focused on the Late Paleoproterozoic rims of zircons, but ignored many important details of their own data. Their comments are based on a misconception that eclogite zircons have unique geochemical (REE, Th/U) and isotopic (Lu-Hf, δ18O) characteristics that do not depend on rock types and pressure rates (that were high or ultrahigh) during metamorphism. This idea leads to false unambiguous dating of the eclogite facies metamorphism based on single samples of the rocks.

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Section: изотопная система кислородаunclassified

Section: обоснование возраста эклогитовunclassified

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Reply to Comments From S.G. Skublov, A.V. Berezin, and L.I. Salimgaraeva on the Article Authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

Mints

Dokukina

2021

Geodin. tektonofiz.

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“…Пористый циркон в ходе реакций растворенияпереосаждения захватывает высвобождающийся Eu. Поскольку титанит является одним из главных концентраторов LREE в метагаббро [Henderson, 1980;Marks et al, 2008], а рутил, напротив, содержит исчезающие малые концентрации REE [Zeh et al, 2018], максимальные концентрации LREE и MREE в цирконе можно объяснить реакцией замещения титанита рутилом, которая связана переходом к PTпараметрам эклогитовой фации [Angiboust, Harlov, 2017;Müller et al, 2018]: высвобож даемые REE утилизируются пористым цирконом. Кристаллизация граната не оказала заметного влияния на концентрацию REE в уже существующем магматичес ком цирконе.…”

Section: возраст метаморфизма эклогитовой фацииunclassified

The Belomorian eclogite province (eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

Mints

Dokukina

2020

Geodin. tektonofiz.

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A critical discussion of competing models of the geodynamic nature (oceanic or continental subduction) and age (Meso-Neoarchean or Late Paleoproterozoic) of the eclogite facies metamorphism in the Belomorian eclogite province (BEP) is based on the systematic analysis of the sum of previously known and newly obtained data characterizing the geological structure of the Salma eclogite association and features of zircons from eclogites, including the isotopegeochronological and geochemical characteristics, composition and distribution of mineral inclusions. Regular changes in the REE trends and crystallization-recrystallization temperature of porous zircons in eclogite-metagabbro illustrate the sequence of magmatic and metamorphic events in the Meso-Neoarchean and Paleoproterozoic. The susceptibility to recrystallization of zircons is due to partial metamictness and porous structure. The earliest (~2.9 Ga) zircon zones retain mag-matic-type REE trends. The microinclusions of the prenite-pumpelliite and greenschist facies minerals and the increase in the LREE and MREE concentrations indicate hydrothermal metamorphism in the spreading ridge and on the ocean floor at 2.9–2.82 Ga. Prenite, pumpelliite, albite, actinolite, chlorite, diaspore and saponite also form inclusions in the eclogitic garnet. An increase of LREE and MREE, the disappearance of the Ce positive anomaly, a change from negative to positive Eu anomaly at 2.82–2.78 Ga indicate that plagioclase was removed during the formation of the ‘garnet + omphacite’ eclogite association and the replacement of sphene with rutile. The eclogite facies metamorphism linked with subduction of the oceanic crust is also indicated by the microinclusions of garnet and rutile in zircon. The crystallization temperature in 700–900 °C range of the round-oval zircons from eclogites-metagabbronorites records the Neoarchean granulite facies metamorphism at 2.77–2.70 Ga, the negative Eu anomalies in the cores and rims of zircons indicate the participation of plagioclase in the metamorphic crystallization. Late (2.1–1.7 Ga) rims of porous zircons that occurred at 600–680 °C are distinguished by minimal REE concentrations, a change from a positive Eu anomaly to a negative one, and the appearance of a negative Ce anomaly, which indicates the presence of plagioclase, reducing type of fluids and, accordingly, low water activity that is characteristic of high-temperature metamorphism under stretching condition and mantle-plume activity. The deep Sm-Nd system reworking in the Belomorian tectonic province, including BEP, at ~1.9 Ga was caused by the crustal heating that spread from the Lapland granulite belt border in the west-south-westward direction. The Lu-Hf system in zircon reworking with a significant increase in radiogenic Hf indicates the recrystallization of a long-existing garnet, in which a significant amount of radiogenic 176Hf accumulated by 1.9 Ga as a result of the 176Lu decay. This contradicts the earlier suggestion of the eclogite garnet primary crystallization in the late Paleoproterozoic (1.94–1.89 Ga).

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“…Zack et al (2002) showed for eclogites that 1 modal-% of rutile can incorporate more than 90% of the whole rock content of Ti, Nb, Ta, Sb and W and 5-50% of the whole rock content of V, Cr, Mo and Sn. Because the diffusivities of the trace elements of interest for volume diffusion are very low at the appropriate temperatures (e.g., Cherniak et al, 2007), rutile is an important controller of trace elements, such as Nb and Ta, in the continental crust (e.g., Zeh et al, 2018;Pereira et al, 2019), and for distinguishing between detrital rutile formed from mafic versus felsic source rocks (e.g., Zack et al, 2004). The occurrence of rutile in a range of rock types buffers the Ti content of co-existing quartz, and the temperature-dependence of the Ticontent of quartz in equilibrium with rutile has been experimentally determined (Wark and Watson, 2006;Thomas et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

LA-ICP-MS U–Pb dating of rutiles associated with hydrothermal mineralization along the southern Araçuaí Belt, SE Brazil

Santos

Lana

Scholz

et al. 2020

Journal of South American Earth Sciences

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Rutile alteration and authigenic growth in metasandstones of the Moeda Formation, Minas Gerais, Brazil – A result of Transamazonian fluid–rock interaction

Cited by 21 publications

References 82 publications

Reply to Comments From S.G. Skublov, A.V. Berezin, and L.I. Salimgaraeva on the Article Authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

Reply to Comments From S.G. Skublov, A.V. Berezin, and L.I. Salimgaraeva on the Article Authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

The Belomorian eclogite province (eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic?

LA-ICP-MS U–Pb dating of rutiles associated with hydrothermal mineralization along the southern Araçuaí Belt, SE Brazil

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