Ben Jacobsen

Tilburg University

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Qing‐Zhu Yin

University of California, Davis

I. D. Hutcheon

Lawrence Livermore National Laboratory

K. Nagashima

University of Hawaiʻi at Mānoa

Alexander N. Krot

University of Hawaiʻi at Mānoa

Vinciane Debaille

Université Libre de Bruxelles

J. Matzel

Lawrence Livermore National Laboratory

A. D. Brandon

University of Houston

Frédéric Moynier

Université Paris Cité

Peter Weber

Lawrence Livermore National Laboratory

Naomi Marks

Lawrence Livermore National Laboratory

Cooperative Institutions

Planetary Science Institute

Lawrence Livermore National Laboratory

University of California, Berkeley

Centre National de la Recherche Scientifique

University of California, Davis

California Institute of Technology

University of California, Los Angeles

Johnson Space Center

Lawrence Livermore National Security

University of Hawaiʻi at Mānoa

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The Berkeley Earth Surface Temperature Averaging Methodology

AGU Fall Meeting Abstracts (2011)

Robert Rohde David R. Brillinger J. A. Curry D. Groom Ben Jacobsen

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Lu-Hf AND Sm-Nd ISOTOPIC STUDIES OF SHERGOTTITES AND NAKHLITES: IMPLICATIONS FOR

Vinciane Debaille Ben Jacobsen Lunar

NASA-Johnson Space Center, Mail code KR, Houston TX 77058 Introduction: We present a new Lu-Hf and Sm-Nd isotope systematics study of four enriched shergottites (Zagami, Shergotty, NWA856 and Los Angeles), and three nakhlites (Nakhla, MIL03346 and Yamato 000593) in order to further understand processes occurring during the early differentiation of Mars and the crystallization of its magma ocean. Two fractions of the terrestrial petrological analogue of nakhlites, the Archaean Theo’s flow (Ontario, Canada [1]) were also measured. The coupling of Nd and Hf isotopes provide direct insights on the mineralogy of the melt sources. In contrast to Sm/Nd, Lu/Hf ratios can be very large in minerals such as garnet. Selective partial melting of garnet bearing mantle sources can therefore lead to characteristic Lu/Hf signatures that can be recognized with

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Martian mantle mineralogy investigated by the 176Lu–176Hf and 147Sm–143Nd systematics of shergottites

Earth and Planetary Science Letters (2008)

Vinciane Debaille Qing‐Zhu Yin A. D. Brandon Ben Jacobsen

Planetary differentiation

10.1016/j.epsl.2008.02.008

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Citations (102)

Quantifying the effect of late bombardment on terrestrial zircons

Earth and Planetary Science Letters (2023)

Jesse Reimink C. A. Crow D. E. Moser Ben Jacobsen Ann M. Bauer

Hadean

Shock metamorphism

Early Earth

10.1016/j.epsl.2023.118007

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The Mg isotopic systematics of granitoids in continental arcs and implications for the role of chemical weathering in crust formation

Proceedings of the National Academy of Sciences (2009)

Bing Shen Ben Jacobsen Cin‐Ty A. Lee Qing‐Zhu Yin Douglas M. Morton

Continental crust is too Si-rich and Mg-poor to derive directly from mantle melting, which generates basaltic rather than felsic magmas. Converting basalt to more felsic compositions requires a second step involving Mg loss, which is thought to be dominated by internal igneous differentiation. However, igneous differentiation alone may not be able to generate granites, the most silicic endmember making up the upper continental crust. Here, we show that granites from the eastern Peninsular Ranges Batholith (PRB) in southern California are isotopically heavy in Mg compared with PRB granodiorites and canonical mantle. Specifically, Mg isotopes correlate positively with Si content and O, Sr, and Pb isotopes and negatively with Mg content. The elevated Sr and Pb isotopes require that a component in the source of the granitic magmas to be ancient preexisting crust making up the prebatholithic crustal basement, but the accompanying O and Mg isotope fractionations suggest that this prebatholithic crust preserved a signature of low-temperature alteration. The protolith of this basement rock may have been the residue of chemical weathering, which progressively leached Mg from the residue, leaving the remaining Mg highly fractionated in terms of its isotopic signature. Our observations indicate that ancient continental crust preserves the isotopic signature of compositional modification by chemical weathering.

Felsic

Batholith

Protolith

Underplating

Adakite

Crustal recycling

10.1073/pnas.0910663106

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Citations (117)

Temporal and Spatial Heterogeneities in the Solar Nebula Reflected in Rb-Sr and Sm-Nd Systematics of Al3S4, an Allende Type B CAI

Lunar and Planetary Science Conference (2012)

Naomi Marks L. E. Borg I. D. Hutcheon Ben Jacobsen R. N. Clayton

Allende meteorite

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Coupled 142Nd–143Nd evidence for a protracted magma ocean in Mars

Nature (2007)

Vinciane Debaille A. D. Brandon Qing‐Zhu Yin Ben Jacobsen

10.1038/nature06317

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Citations (197)

Fossil records of early solar irradiation and cosmolocation of the CAI factory: A reappraisal

Science Advances (2021)

David V. Bekaert Maureen Auro Q. R. Shollenberger Ming‐Chang Liu Horst R. Marschall

Calcium-aluminum–rich inclusions (CAIs) in meteorites carry crucial information about the environmental conditions of the nascent Solar System prior to planet formation. Based on models of 50V–10Be co-production by in-situ irradiation, CAIs are considered to have formed within ~0.1 AU from the proto-Sun. Here, we present vanadium (V) and strontium (Sr) isotopic co-variations in fine- and coarse-grained CAIs and demonstrate that kinetic isotope effects during partial condensation and evaporation best explain V isotope anomalies previously attributed to solar particle irradiation. We also report initial excesses of 10Be and argue that CV CAIs possess essentially a homogeneous level of 10Be, inherited during their formation. Based on numerical modeling of 50V–10Be co-production by irradiation, we show that CAI formation during protoplanetary disk build-up likely occurred at greater heliocentric distances than previously considered, up to planet-forming regions (~1AU), where solar particle fluxes were sufficiently low to avoid substantial in-situ irradiation of CAIs.

10.1126/sciadv.abg8329

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Citations (10)

A New Estimate of the Earth's Land Surface Temperature History

AGU Fall Meeting Abstracts (2011)

Robert A. Muller J. A. Curry D. Groom Ben Jacobsen S. Perlmutter

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Lu-Hf and Sm-Nd Isotopic Studies of Shergottites and Nakhlites: Implications for Martian Mantle Sources

Lunar and Planetary Science Conference (2007)

Vinciane Debaille Qing‐Zhu Yin A. D. Brandon Ben Jacobsen Allan Treiman

We present a new Lu-Hf and Sm-Nd isotope systematics study of four enriched shergottites (Zagami, Shergotty, NWA856 and Los Angeles), and three nakhlites (Nakhla, MIL03346 and Yamato 000593) in order to further understand processes occurring during the early differentiation of Mars and the crystallization of its magma ocean. Two fractions of the terrestrial petrological analogue of nakhlites, the Archaean Theo's flow (Ontario, Canada) were also measured. The coupling of Nd and Hf isotopes provide direct insights on the mineralogy of the melt sources. In contrast to Sm/Nd, Lu/Hf ratios can be very large in minerals such as garnet. Selective partial melting of garnet bearing mantle sources can therefore lead to characteristic Lu/Hf signatures that can be recognized with Hf-176/Hf-177Hf ratios.

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Citations (3)