A heterogenous mantle and crustal structure formed during the early differentiation of Mars

Highly siderophile element abundances and Os isotopes of nakhlite and chassignite meteorites demonstrate that they represent a comagmatic suite from Mars. Nakhlites experienced variable assimilation of >2 Ga altered high Re/Os basaltic crust. This basaltic crust is distinct from the ancient crust represented by meteorites Allan Hills 84001, or impact-contaminated Northwest Africa 7034/7533. Nakhlites and chassignites that did not experience crustal assimilation were extracted from a depleted lithospheric mantle distinct from the deep plume source of depleted shergottites. The comagmatic origin for nakhlites and chassignites demonstrates a layered martian interior comprising ancient enriched basaltic crust derived from trace element-rich shallow magma ocean cumulates, a variably metasomatized mantle lithosphere, and a trace element-depleted deep mantle sampled by plume magmatism., Major and trace element abundance determinations and sources
New major and trace element abundance data are reported for nakhlite Y-000802 and ALH 84001 (Table S2). The data were obtained in an identical way to previously reported data by our group on nakhlites and chassignites (e.g., [14,16,25,32]) at the Scripps Isotope Geochemistry Laboratory (SIGL). This included the digestion of a 50 mg aliquot from a larger mass of sample powder (1 to 2g) also used for Re-Os isotope and HSE abundance analysis. Complete digestion was accomplished by sealing the sample with Teflon-distilled 27.5M HF (4 mL) and 15.7M HNO3 (1 mL) in closed-capped Teflon beakers for >72 hrs on a hotplate at 150°C, along with total procedural blanks and terrestrial basalt and andesite reference materials (BHVO-2, BCR-2, BIR-1a, AGV-2). Samples were sequentially dried and taken up in concentrated HNO3 to destroy fluorides, followed by doping with indium to monitor instrumental drift during analysis and then diluted to..., , # A heterogenous mantle and crustal structure formed during the early differentiation of Mars

[https://doi.org/10.5061/dryad.gf1vhhmwx](https://doi.org/10.5061/dryad.gf1vhhmwx)

Data are provided for major and trace element abundances, as well as new Re-Os isotope and highly sideophile element abundances (Os, Ir, Ru, Pt, Pd, Re) for nakhlites, chassignites and the martian meteorite ALH 84001.

## Description of the data and file structure

Data are provided in five supplementary tables. Table S1 shows the new Re-Os isotope and HSE abundance data. Table S2 includes both published and new major- and trace-element abundance data. Table S3 shows the percentage blank additions for new data in Table S1. Table S4 provides the full published data for Re-Os isotopes and HSE abundances in nakhlites, chassignites, and ALH 84001. Table S5 provides Os and S isotope data shown in the manuscript.

## Sharing/Access information

Data was derived from the following sources:

* This work
* \[For Tab...