Precipitation trapped in datable rock-forming minerals: estimating Antarctic palaeoelevations - a discussion
| Autor: | Adrian J. Boyce, Alan P. M. Vaughan, Anke S. Wendt |
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| Rok vydání: | 2006 |
| Předmět: |
010504 meteorology & atmospheric sciences
Global meteoric water line δ18O Earth science Metamorphism Geology 010502 geochemistry & geophysics Oceanography 01 natural sciences Isotopes of oxygen Infiltration (hydrology) Mountain formation Isotope fractionation Meteoric water Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences |
| Zdroj: | Antarctic Science. 18:123-139 |
| ISSN: | 1365-2079 0954-1020 |
| DOI: | 10.1017/s0954102006000125 |
| Popis: | Meteoric water that interacted with minerals during retrogressive metamorphism and hydrothermalism in the late-stage of mountain building processes contains hydrogen and oxygen isotopes that are potential proxies for palaeoelevation reconstruction in Antarctica. The effects of temperature on meteoric isotopic signatures, meteoric crustal infiltration processes, and the mechanisms of capture and preservation of meteoric δD and δ18O values in rock-forming minerals are discussed. Special emphasis is given to Antarctica’s geographical high-latitude position and climatic fluctuations over time and to the highmountain ranges of continental Antarctica, which were tectonically active regions in the past. In this context, a new compilation of recent Antarctic snow and ice δD and δ18O data is presented, by which we demonstrate that net elevations versus isotopic depletions are positively correlated for continental Antarctica - a prime requisite when estimating palaeoelevations. |
| Databáze: | OpenAIRE |
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