Initial 87Sr/86Sr as a sensitive tracer of Archaean crust-mantle evolution: Constraints from igneous and sedimentary rocks in the western Dharwar Craton, India

Ravindran, Arathy; Mezger, Klaus; Balakrishnan, S.; Kooijman, Ellen; Kielman‐Schmitt, Melanie; Berndt, Jasper

doi:10.1016/j.precamres.2019.105523

Cited by 26 publications

(25 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, Eu negative anomaly in the Ghareh Bagh apatite is probably related to the plagioclase crystallization before the apatite crystallization. Eu/Eu* in apatite grains are related to Eu/Eu* in the melt, Eu 2+ /Eu 3+ ratio, and the redox condition of the host magma [3,65,66]. The redox condition can control the specious of volatiles and ligand and plays a significant role in magmatic-hydrothermal systems.…”

Section: Eu Contents In the Apatite And Oxygen Fugacitymentioning

confidence: 99%

Rare Earth Elements and Sr Isotope Ratios of Large Apatite Crystals in Ghareh Bagh Mica Mine, NW Iran: Tracing for Petrogenesis and Mineralization

et al. 2020

View full text Add to dashboard Cite

The 320 Ma Ghareh Bagh mica mine is the only active mica mine in northwest Iran, and hosts Mg-bearing biotite (phlogopite) with apatite, epidote, and calcite. Chemical investigation of apatite infers the high abundances of the rare earth elements (REEs up to 5619 ppm), higher ratios of the LREE/HREE ((La/Yb)N = 28.5–36.7)) and high content of Y (236–497 ppm). REE pattern in the apatite and host A-type granite is almost the same. Ghareh Bagh apatite formed from the early magmatic-hydrothermal exsolved fluids at the high temperature from the Ghushchi alkali feldspar granite. The apatite crystals came up as suspension grains and precipitated in the brecciated zone. The early magmatic-hydrothermal fluids settle phlogopite, epidote, chlorite, K-feldspar and albite down in the brecciation zone. Due to the precipitation of these minerals, the late-stage fluids with low contents of Na+, Ca2+ and REE affected the early stage of alteration minerals. The high ratios of 87Sr/86Sr (0.70917 to 0.70950) are more consistent with crustal sources for the apatite large crystals. The same ages (320 Ma) for both brecciated mica veins and host alkali feldspar granites infer the apatite and paragenesis minerals were related to host granite A-type granite in the Ghareh Bagh area.

show abstract

Section: Eu Contents In the Apatite And Oxygen Fugacitymentioning

confidence: 99%

Rare Earth Elements and Sr Isotope Ratios of Large Apatite Crystals in Ghareh Bagh Mica Mine, NW Iran: Tracing for Petrogenesis and Mineralization

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Strontium isotope data obtained in this study is available in Supplementary Table S2 and the Pangaea data repository under doi.pangaea.de/10.1594/PANGAEA.913541. We have used published strontium isotope data for Barite Valley, Sargur and North Pole barite samples from 14,15,50 , sulfur isotope data for Londozi, North Pole, Vergelegen, Stentor/Amo and Barite Valley from 27 and oxygen isotope data for Barite Valley from 40 . Ages of the barite deposits are from 19,21,23,27,29,31 .…”

Section: Data Availabilitymentioning

confidence: 99%

The emergence of subaerial crust and onset of weathering 3.7 billion years ago

Roerdink

Ronen

Strauß

et al. 2020

Preprint

View full text Add to dashboard Cite

Reconstructing the emergence and weathering of continental crust in the Archean is crucial for our understanding of early ocean chemistry, biosphere evolution and the onset of plate tectonics. However, considerable disagreement exists between the elemental and isotopic proxies that have been used to trace crustal input into marine sediments and data are scarce prior to 3 billion years ago. Here we show that chemical weathering modified the Sr isotopic composition of seawater as recorded in 3.52-3.20 Ga stratiform barite deposits from three different cratons. Using a combination of Sr, S and O isotope data, barite petrography and a hydrothermal mixing model, we calculate a novel Sr isotope evolution trend for Paleoarchean seawater that is much more radiogenic than the curve previously determined from carbonate rocks. Our findings require the presence and weathering of subaerial and evolved (high Rb/Sr) crust from 3.7 ± 0.1 Ga onwards. This Eoarchean onset of crustal weathering affected the chemistry of the oceans and supplied nutrients to the marine biosphere 500 million years earlier than previously thought.

show abstract

“…However, certain isotopes, e.g., Hf -O, are not always suitable to place unique constraints on crustal growth (Couzinié et al, 2016). Most of the radioisotope systems, especially the Rb -Sr and to a lesser extent the Sm -Nd and Lu-Hf systems, are prone to alteration by metamorphism, which can lead to the retrieval of wrong initial isotope ratios for the host rock (Moorbath et al, 1997;Fisher et al, 2020;Hammerli et al, 2019;Ravindran et al, 2020). Zircon can be formed and altered during multiple magmatic and metamorphic episodes, with serious consequences for the interpretation of combined U -Pb and Lu -Hf isotopic data obtained by in-situ laser analyses (e.g., Gerdes and Zeh, 2009).…”

Section: Introductionmentioning

confidence: 99%

Formation of Paleo- to Meso-Archean continental crust in the western Dharwar Craton, India: Constraints from U Pb zircon ages and Hf-Pb-Sr isotopes of granitoids and sedimentary rocks

et al. 2023

Self Cite

View full text Add to dashboard Cite

Initial 87Sr/86Sr as a sensitive tracer of Archaean crust-mantle evolution: Constraints from igneous and sedimentary rocks in the western Dharwar Craton, India

Cited by 26 publications

References 88 publications

Rare Earth Elements and Sr Isotope Ratios of Large Apatite Crystals in Ghareh Bagh Mica Mine, NW Iran: Tracing for Petrogenesis and Mineralization

Rare Earth Elements and Sr Isotope Ratios of Large Apatite Crystals in Ghareh Bagh Mica Mine, NW Iran: Tracing for Petrogenesis and Mineralization

The emergence of subaerial crust and onset of weathering 3.7 billion years ago

Formation of Paleo- to Meso-Archean continental crust in the western Dharwar Craton, India: Constraints from U Pb zircon ages and Hf-Pb-Sr isotopes of granitoids and sedimentary rocks

Contact Info

Product

Resources

About