Proterozoic (pre-Ediacaran) glaciation and the high obliquity, low-latitude ice, strong seasonality (HOLIST) hypothesis: Principles and tests

摘要: Abstract Sedimentological observations and palaeomagnetic data for Cryogenian glacial deposits present the climatic paradox of grounded glaciers in situ cold climate near sea-level, glaciomarine deposition, accompanying large (up to 40 °C) seasonal changes temperature, all low near-equatorial (  54°) obliquity ecliptic, which would render equator cooler than poles, on average, amplify global seasonality. A high per se not have been a primary trigger glaciation, but strongly influenced latitudinal distribution glaciers. The principle low-latitude glaciation terrestrial planet with is validated by theoretical studies Mars. early Earth likely outcome single giant impact at 4.5 Ga, widely favoured mechanism lunar origin. This implies that could prevailed during most Precambrian, controlling palaeolatitude glaciations late Palaeoproterozoic Cryogenian. It postulated changed High Obliquity, Low-latitude Ice, STrong seasonality (HOLIST) hypothesis pre-Ediacaran emerges favourably from numerous non-glacial tests. accord such established or implied features glaciogenic successions as extensive long-lived open seas, an active hydrological cycle, aridity palaeowesterly (reversed zonal) winds palaeolatitudes, apparent diachronism non-correlation some low-palaeolatitude glaciations. also offers viable solution faint young Sun warm Archaean Earth. Furthermore, reduction Ediacaran–early Palaeozoic yielded more habitable globe much reduced stresses may important factor influencing unique evolutionary events Ediacaran Cambrian. palaeolatitudinal evaporites cannot discriminate unambiguously between high- low-obliquity states Intervals true polar wander others Early Cambrian imply major mass-redistributions within those times, provide potential reducing Palaeozoic.