نتایج جستجو برای: lacustrine environment
تعداد نتایج: 519568 فیلتر نتایج به سال:
Recent mineralogical studies suggest past aqueous activities in the 150-km-wide Robert Sharp impact crater, western neighbor of Gale crater on Mars. Despite their similarities, and craters display very different morphologies. Using high-resolution orbital images, we made morphological stratigraphical analyses, as well age determinations showing that has experienced a complex geological history....
Abstract The Curiosity rover is exploring Hesperian-aged stratigraphy in Gale crater, Mars, where a transition from clay-bearing units to layered sulfate-bearing unit has been interpreted represent major environmental of unknown character. We present the first description key facies unit, recently observed distance by rover, and propose model for changes depositional environments. Our results i...
—Kokanee (Oncorhynchus nerka lacustrine sockeye salmon) spawned in groundwater upwelling in the North Fork of the Payette River, Idaho. Intragravel water temperatures in groundwater-influenced redds exceeded surface flow water temperature by 2.4–2.68C. In redds without groundwater influence, intragravel and water column temperatures did not differ by more than 0.28C. Although redds constructed ...
We examined membrane-spanning archaeal lipids using ultra high pressure liquid chromatography-high resolution mass spectrometry (UHPLC-HRMS) in a suite of sediment samples from both cored sequences (Messel oil shale and Lake Chala) surface sediments (Azorean lakes) encompassing ancient modern (Eocene to Present) lacustrine environments. Additionally we compared the data those marine (Mediterran...
Observations are presented from Lake Biwa and Lake Kinneret showing the ubiquitous and often periodic nature of high-frequency internal waves in large stratified lakes. In both lakes, high-frequency wave events were observed within two distinct categories: (1) Vertical mode 1 solitary waves near a steepened Kelvin wave front and vertical mode 2 solitary waves at the head of an intrusive thermoc...
Records of past changes in lake levels and lake water isotopic composition in closed basins provide key insights into past variations in the hydrological cycle; however, these records are often limited by dating precision and temporal resolution. Here we present data from lacustrine cave carbonates, a previously unexplored class of carbonates that comprise a promising new archive of past hydrol...
The Mars Science Laboratory (MSL) rover Curiosity has documented a section of fluvio-lacustrine strata at Yellowknife Bay (YKB), an embayment on the floor of Gale crater, approximately 500 m east of the Bradbury landing site. X-ray diffraction (XRD) data and evolved gas analysis (EGA) data from the CheMin and SAM instruments show that two powdered mudstone samples (named John Klein and Cumberla...
Knowledge about the rates of pedogenic processes is essential to understand landscape development and history. It can be attained by the quantitative investigation of soil chronosequences. In this work, the development of Chromic Luvisols in the Mediterranean is addressed. The soils investigated are located on fi ve uplifted Pleistocene marine terraces in south-western Sicily, and have develope...
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