Understanding the development of calcic and petrocalcic horizons is important for palaeoclimate reconstruction. The micromorphology and geochemistry of Quaternary calcic and petrocalcic horizons formed in the area around Coimbatore, Tamil Nadu are discussed. The calcic horizons represent the Bk horizons that occur as thick complex profiles ( 300 cm thick) in the foothill regions while the lamin...

Pedorelicts occur sporadically in coastal exposures of Middle to Late Triassic continental sediments, at Portishead, SW England. The clasts include aeolian and bedrock constituents, calcrete textures, vesicles other pedogenic features reflecting a hot semi-arid palaeoenvironment. Interpreted as being derived from an upland soil, they are classified palaeosol terms Calcic Protosol. In the most s...

Late Oligocene (ca 25 Ma) volcano-sedimentary successions exposed on the western periphery of Doupovské Hory Volcanic Complex reveal a complex sedimentation history influenced in various ways by decay alkali basalt volcanic edifice. Weathering rocks supplied abundant reactants that promoted carbonate precipitation peripheral palaeolakes—as evidenced strongly non-radiogenic 87Sr/86Sr values (0.7...

—The Triassic System in the Zuni Mountains consists of one Middle Triassic unit, the Moenkopi Formation, the Upper Triassic Chinle Group, and the Upper Triassic-Lower Jurassic(?) Wingate Sandstone. The Chinle Group in the Zuni Mountains consists of six formations, in ascending order: Zuni Mountains (named here; = “mottled strata” of previous workers), Shinarump, Bluewater Creek, Petrified Fores...

Reflectance and emission spectroscopy remain the most capable method for mineral identification from orbit. However, to best utilize spectra returned from Mars for mission planning, the current level of understanding of the spectral signature of weathered and rough materials should be considered. Materials measured in the laboratory tend to have band strengths that are stronger than those measu...

Soils overlying two porphyry Cu deposits (Spence, Gaby Sur) and the Pampa del Tamarugal, Atacama Desert, Northern Chile were collected in order to investigate the extent to which saline groundwaters influence ‘‘soil’’ chemistry in regions with thick Miocene and younger sediment cover. Soil carbonate (calcite) was analyzed for C and O isotopes and pedogenic gypsum for S isotopes. Soil calcite is...

Abstract The Namib Desert and the Kalahari constitute drylands of southern Africa, with current relatively humid portions latter having experienced periodically drier conditions during Late Quaternary. This study explores range dryland archives proxies available for past ~190 ka. These include classic geomorphological proxies, such as sand dunes, well water-lain sediments within former lakes ep...

SUMMARY This study explores the geomorphological expression and geological context of a normal fault scarp in stable continental region (SCR) which we interpret as having failed large (Mw >7) earthquakes. Records such faulting events an SCR (or even more rapidly deforming regions) are extremely rare, so understanding this feature is international interest. The exceptionally well-preserve...

Kimberlites occur as dykes up to 3 m thick and isometric bodies in the southern explored part of a NE-SW trending Karoo graben across the Mozambique Belt in northern Mozambique. The kimberlites are reported along four NW-SE-trending zones, and one ENE-WSW-trending zone. The kimberlites are macrocrystic hypabyssal Group Ia kimberlites based on their mineralogy and whole rock geochemistry. The ki...