从加利福尼亚古土壤推断新元古代雪球地球范围

G. Retallack
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引用次数: 0

摘要

在美国加利福尼亚州西Panamint山脉Redlands峡谷的Kingston峰组的早深冷世(717-659 Ma)、Surprise二晶岩段和酵母灰岩段,报道了具有砂楔和分选石条纹的Gelisol古土壤。因此,惊奇二晶岩并不完全是海相的,尽管在金斯顿峰组的其他部分可能存在冰川期海洋沉积物和构造诱发的大量浪费沉积物。对惊奇二晶岩的古地磁研究表明,沙楔和石条古土壤是古纬度低至8±4º的寒冷大陆气候的局部无冰陆地的证据。斯特特冰期是一个戏剧性的全球变冷,但不是一个全球性的雪球。裸露的山体滑坡、冲积扇、含有矿物质营养物质的农田和黄土,以及为陆地上复杂生命提供的微地形庇护所,对地球上的生命在冰川破坏中生存下来至关重要。
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Neoproterozoic Snowball Earth extent inferred from paleosols in California
Gelisol paleosols with sand wedges and sorted stone stripes are reported from the early Cryogenian (717–659 Ma), Surprise Diamictite Member and Sourdough Limestone Member of the Kingston Peak Formation in Redlands Canyon, western Panamint Range, California. The Surprise Diamictite was thus not entirely marine, although glaciomarine sediments and tectonically induced, mass wasting deposits, may be present in other parts of the Kingston Peak Formation. Sand wedge and stone stripe paleosols are evidence of local ice–free land with frigid continental climate at paleolatitude as low as 8 ± 4º from paleomagnetic studies of the Surprise Diamictite. The Sturt glaciation was a dramatic global cooling, but not a global snowball. Bare ground of landslides, alluvial fans, till and loess with mineral nutrients, and microtopographic shelter for complex life on land would have been important for survival of life on Earth from glacial destruction.
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