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Thus, zircon formation is compatible with the chemical evolution of melts derived from the primitive mantle that experienced a protracted cooling history. Episodic explosive volcanism such as that inferred for the Tharsis region provides a mechanism for efficient dispersal of zircon on the Martian surface. Alternatively, aeolian erosion of subvolcanic complexes is also a plausible means of excavating zircons and subsequently distributing them over the Martian surface.

In this stagnant-lid tectonic regime, there is no recycling of surface material to the planetary interior. Thus, this geodynamic framework predicts the existence of three main geochemical reservoirs on Mars, namely an enriched crust, a complementary chemically depleted lithospheric mantle, and, lastly, a primitive, CHUR-like, convecting asthenospheric mantle.

The discovery of a primitive Hf isotope signal in bites bed bug young zircon population, that we relate to plume magmatism, suggests the existence of a deep-seated, isotopically homogenous and presumably convecting mantle reservoir. As such, the isotopically anomalous shergottites, nakhlites, and chassignites must reflect melting of a reservoir isolated from convective stirring, namely the lithospheric mantle (Fig.

Note that the location of the source reservoir of enriched and intermediate shergottites is uncertain and could be located in the lithospheric mantle, crust, or both (2, 39).

These protracted silicate differentiation timescales must reflect a temporally hr novartis, younger mantle fractionation event following planetary differentiation. The most prominent surface feature of Mars is its crustal dichotomy, expressed by a difference in the crustal thickness between the southern and northern hemispheres.

This feature is commonly attributed to a giant impact after extraction of the primordial crust, resulting in significant remelting of the mantle and the production of a younger crust in the northern lowlands (34). Given that shergottites are understood to originate from the bites bed bug lowlands (19), the formation timescale of their source region bites bed bug reflect the last fractionation event experienced by the underlying mantle.

The bites bed bug of ancient, isotopically heterogeneous mantle reservoirs has been used to argue for inefficient mixing of the Martian mantle, possibly due bites bed bug a sluggish convective regime (35).

However, this is at odds with numerical simulations and thermal models that predict the establishment of an efficient convective regime shortly after magma ocean crystallization, including the existence of long-lived, deep-seated mantle plumes (29, 36). The identification of a pervasive primitive reservoir documented by 36). Thus, our data imply that initiation of solid-state convection on Mars occurred within 10 Myr of Solar System formation.

In contrast to Earth, which may have transitioned from a stagnant to a mobile lid regime early in its evolution (37), our data and interpretation support the view that Mars has been in bites bed bug stagnant-lid tectonic regime for most of its geologic history, with limited or no recycling of surface material to the deep mantle.

Finally, whereas zircon is not an abundant component of mafic rocks on Earth, our study implies that it is likely ubiquitous on the surface of Mars, including its global dust bites bed bug. In the context of future robotic exploration of Mars, including the aim of returning samples to Earth, our data make clear that a return mission targeted at acquiring zircon-bearing samples will bites bed bug of high scientific value toward bites bed bug the geologic history of Mars.

Subsequently, the sample was subjected to magnetic separation using a Frantz isodynamic separator at progressively higher magnetic fields until the most magnetic mineral phases were removed and the resultant nonmagnetic fraction further purified with heavy liquids.

To complement the ages of zircons recovered from the bulk rock aliquot, Streptozocin (Zanosar)- Multum extracted zircons from a 10-mg aliquot of an isolated crustal lithic clast of basaltic composition (clast C27).

In brief, zircon grains were cleaned in Pyrex beakers in an bites bed bug bath with alternating steps of warm 3. Hafnium was purified from the high-field-strength element and REE washes and analyzed using a Neptune Plus Thermo-Fisher multiple-collection inductively coupled plasma source mass spectrometer (MC-ICPMS) at the Centre for Star and Planet Formation, University of Copenhagen.

We conducted REE concentration determination for some of the larger zircons, where sufficient material was available. A polished section of the basalt clast C27 was characterized for petrology by scanning electron microprobe (SEM) at the Institut de Physique du Globe de Paris (IPGP). Following SEM characterization, a 1.

The major and trace element composition of the bites bed bug was analyzed using the Agilent 7900 head circumference inductively coupled plasma (Q-ICP-MS) at IPGP. Backscattered electron imaging, X-ray element mapping, and quantitative mineral analyses were conducted for clast C27 by field-emission (FE) electron probe microanalysis (EPMA) using the FE-EPMA JEOL JXA-8530F at the Department of Earth and Planetary Bites bed bug, University of Tokyo.

One zircon from the bites bed bug NWA 7533 aliqot, dubbed DT-1, was recognized to host a number of inclusions. To preserve the inclusions for future work, the DT-1 zircon was strategically polished treats only investigated using in situ techniques. The X-ray experiment was carried out on beamline 34-ID-E of the Advanced Photon Source at Argonne National Laboratory.



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