Geomorphologic and Lithologic Evidence for an expanded Mountain Ice Sheet on Mount Kenya during the Early Quarternary
نویسندگان
چکیده
منابع مشابه
Dynamic Antarctic ice sheet during the early to mid-Miocene.
Geological data indicate that there were major variations in Antarctic ice sheet volume and extent during the early to mid-Miocene. Simulating such large-scale changes is problematic because of a strong hysteresis effect, which results in stability once the ice sheets have reached continental size. A relatively narrow range of atmospheric CO2 concentrations indicated by proxy records exacerbate...
متن کاملIce Sheet Modeling during High-obliquity Climates on Mars: Application to Tharsis Montes Tropical Mountain Glaciation
Introduction: Deposits on the flanks of the large Tharsis Montes volcanoes have been recognized to be of glacial origin [1,2,3]. These Amazonian-aged deposits display three distinct facies, ridged, knobby, and smooth [4], each of which can be associated with different glacial processes [1]. We use the fundamental differences between the atmospheric snow accumulation environments on Earth [5] an...
متن کاملHigh-resolution ice-volume estimates for the early Miocene: Evidence for a dynamic ice sheet in Antarctica
Ice-volume estimates for the early Miocene (23–16 Ma ATS) were determined by applying dO to sea-level calibrations to high-resolution dO records from ODP Sites 1090 and 1218. These calibrated records indicate that ice-volume ranged between 50% and 125% of the present day East Antarctic Ice Sheet (EAIS) during most of the early Miocene (23–17 Ma). Maximum icevolume occurred at each of the early ...
متن کاملIsotopic evidence for continental ice sheet in mid-latitude region in the supergreenhouse Early Cretaceous
Cretaceous represents one of the hottest greenhouse periods in the Earth's history, but some recent studies suggest that small ice caps might be present in non-polar regions during certain periods in the Early Cretaceous. Here we report extremely negative δ(18)O values of -18.12‰ to -13.19‰ for early Aptian hydrothermal zircon from an A-type granite at Baerzhe in northeastern China. Given that ...
متن کاملMicrostructure through an ice sheet
Ice cores through an ice sheet can be regarded as a sample of a unique natural deformation experiment lasting up to a million years. Compared to other geological materials forming the earth‘s crust, the microstructure is directly accessible over the full depth. Controlled sublimation etching of polished ice sections reveals pores, air bubbles, grain boundaries and subgrain boundaries at the sur...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: E&G Quaternary Science Journal
سال: 1991
ISSN: 2199-9090
DOI: 10.3285/eg.41.1.11