The widespread nanostructures of iron oxides and oxyhydroxides are important reagents in
many biogeochemical processes in many parts of our planet and ecosystem. Their functions …

Early Mars climate research has well-defined goals (MEPAG 2018). Achieving these goals
requires geologists and climate modelers to coordinate. Coordination is easier if results are …

The geological record of early Mars displays a variety of features that indicate fundamental
differences from more recent conditions. These include evidence for:(1) widespread …

Jarosite,(K, Na, H) Fe3 (SO4) 2 (OH) 6, commonly occurs as an ephemeral phase in acidic,
oxidizing, sulfate and iron-rich environments on Earth. The discovery of jarosite within …

A model for the formation and distribution of sedimentary rocks on Mars is proposed. In this
model (ISEE-Mars), the rate-limiting step is supply of liquid water from seasonal melting of …

Many interpretations have been proposed to explain the presence of jarosite within Martian
surficial sediments, including the possibility that it precipitated within paleo-ice deposits …

Batch dissolution experiments were undertaken on synthetic arsenojarosites at pH 2, pH 8,
and in ultra-pure water to better understand the influence of As incorporation on the kinetics …

Lakes existed on Mars later than 3.6 billion years ago, according to sedimentary evidence
for deltaic deposition. The observed fluviolacustrine deposits suggest that individual lake …

Jarosite and other metal sulphates are common on Mars and are interpreted to have formed
in an extreme acidic saline aqueous environment, similar to modern Earth analogues where …

The Ares Vallis region is surrounded by highland terrain containing both degraded and
pristine large impact craters that suggest a change in climate during the Late Noachian …