نتایج جستجو برای: subaerial environment
تعداد نتایج: 518340 فیلتر نتایج به سال:
Substrate facies monitoring is critical for the understanding of fluvial geomorphologic and ecohydraulic patterns processes. However, direct substrate measurement time-consuming subjected to data sparsity because small sample, size, limited collections within an area interest, which make it difficult capture patterns. Most new experimental studies focus on mapping based median grain size a spec...
The century-long debate over the origins of inner gorges that were repeatedly covered by Quaternary glaciers hinges upon whether the gorges are fluvial forms eroded by subaerial rivers, or subglacial forms cut beneath ice. Here we apply cosmogenic nuclide exposure dating to seven inner gorges along ~500 km of the former Fennoscandian ice sheet margin in combination with a new deglaciation map. ...
Estimates of ocean temperatures on Earth 3.5 billion years ago (Ga) range between 26° and 85°C. We present new data from 3.47- to 3.43-Ga volcanic rocks and cherts in South Africa suggesting that these temperatures reflect mixing of hot hydrothermal fluids with cold marine and terrestrial waters. We describe fossil hydrothermal pipes that formed at ~200°C on the sea floor >2 km below sea level....
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