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Dan Xie - One of the best experts on this subject based on the ideXlab platform.
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reply to the comment on discovery of radiolaria from upper cretaceous oceanic red beds in daba kangmar and its paleogeographic implication by li et al 2011 palaeogeography palaeoclimatology palaeoecology 312 2011 127 137
Palaeogeography Palaeoclimatology Palaeoecology, 2015Co-Authors: Luba Jansa, Xiaoqiao Wan, Mao Pan, Di Xiu, Dan XieAbstract:Abstract O'Dogherty et al.'s comments on our paper (Luis O'Dogherty, Paulian Dumitrica, Spela Gorican, Jonathan C. Aitchison, Comment on the species and age determination published by Li et al. “Discovery of radiolaria from Upper Cretaceous oceanic red beds in Daba, Kangmar and its paleogeographic implication” [Palaeogeography, Palaeoclimatology, Palaeoecology 312 (2011):127–137], Palaeogeography, Palaeoclimatology, Palaeoecology (2013), http://dx.doi.org/10.1016/j.palaeo.2013.04.002 .) make a number of strident criticisms that attempt to cast doubt upon the species and age determination we made in that paper. In this paper, we will give a reply to their main comments on our paper.
Jonathan C Aitchison - One of the best experts on this subject based on the ideXlab platform.
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comment on the species and age determination published by li et al discovery of radiolaria from upper cretaceous oceanic red beds in daba kangmar and its paleogeographic implication palaeogeography palaeoclimatology palaeoecology 312 2011 127 137
Palaeogeography Palaeoclimatology Palaeoecology, 2015Co-Authors: Paulian Dumitrica, Spela Gorican, Jonathan C AitchisonAbstract:Abstract Li et al. (2011a, Discovery of Radiolaria from Upper Cretaceous Oceanic Red Beds in Daba, Kangmar and its paleogeographic implication. Palaeogeography, Palaeoclimatology, Palaeoecology 312, 127–137) reported three radiolarian assemblages from Cretaceous Oceanic Red Beds (CORBs) in Chuangde Formation, which they assigned to the Late Cretaceous. With only very few exceptions all species have been erroneously determined and, consequently, the age of the samples was wrongly interpreted. None of these radiolarians suggest a Late Cretaceous age, late Santonian to early Maastrichtian, as proposed in the publication. On the contrary, all radiolarians are indicators of an Early Cretaceous age, early Barremian to earliest Albian.
Mark O Cuthbert - One of the best experts on this subject based on the ideXlab platform.
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dripwater organic matter and trace element geochemistry in a semi arid karst environment implications for speleothem Paleoclimatology
Geochimica et Cosmochimica Acta, 2014Co-Authors: Helen Rutlidge, Mark O Cuthbert, Andy Baker, P W Graham, Martin S Andersen, Christopher E Marjo, Gabriel C Rau, Hamid Roshan, Monika MarkowskaAbstract:A series of four short-term infiltration experiments which revealed hydrochemical responses relevant to semi-arid karst environments were carried out above Cathedral Cave, Wellington, New South Wales (NSW), Australia. Dripwater samples were collected at two sites for trace element and organic matter analysis. Organic matter was characterised using fluorescence and interpreted using a PARAFAC model. Three components were isolated that represented unprocessed, soil-derived humic-like and fulvic-like material, processed humic/fulvic-like material and tryptophan-like fluorescence. Principal Component Analysis (PCA) performed on the entire dataset comprising trace element concentrations and PARAFAC scores revealed two dominant components that were identified as soil and limestone bedrock. The soil component was assigned based on significant contributions from the PARAFAC scores and additionally included Ba, Cu, Ni and Mg. The bedrock component included the expected elements of Ca, Mg and Sr as well as Si. The same elemental behaviour was observed in recent stalagmite growth collected from the site. Our experiments demonstrate that existing paleoclimate interpretations of speleothem Mg and Sr, developed in regions of positive water balance, are not readily applicable to water limited environments. We provide a new interpretation of trace element signatures unique to speleothems from water limited karst environments.
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drip water isotopes in semi arid karst implications for speleothem Paleoclimatology
Earth and Planetary Science Letters, 2014Co-Authors: Mark O Cuthbert, Andy Baker, Catherine N Jex, P W Graham, Pauline C Treble, Martin S Andersen, Ian R AcworthAbstract:Abstract We report the results of the first multi-year monitoring and modelling study of the isotopic composition of drip waters in a semi-arid karst terrane. High temporal resolution drip rate monitoring combined with monthly isotope drip water and rainfall sampling at Cathedral Cave, Australia, demonstrates that drip water discharge to the cave occurs irregularly, and only after occasional long duration and high volume rainfall events, where the soil moisture deficit and evapotranspiration is overcome. All drip waters have a water isotopic composition that is heavier than the weighted mean annual precipitation, some fall along the local meteoric water line, others trend towards an evaporation water line. It is hypothesised that, in addition to the initial rainfall composition, evaporation of unsaturated zone water, as well as the time between infiltration events, are the dominant processes that determine infiltration water isotopic composition. We test this hypothesis using a soil moisture balance and isotope model. Our research reports, for the first time, the potential role of sub-surface evaporation in altering drip water isotopic composition, and its implications for the interpretation of speleothem δ O 18 records from arid and semi-arid regions.
Luba Jansa - One of the best experts on this subject based on the ideXlab platform.
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reply to the comment on discovery of radiolaria from upper cretaceous oceanic red beds in daba kangmar and its paleogeographic implication by li et al 2011 palaeogeography palaeoclimatology palaeoecology 312 2011 127 137
Palaeogeography Palaeoclimatology Palaeoecology, 2015Co-Authors: Luba Jansa, Xiaoqiao Wan, Mao Pan, Di Xiu, Dan XieAbstract:Abstract O'Dogherty et al.'s comments on our paper (Luis O'Dogherty, Paulian Dumitrica, Spela Gorican, Jonathan C. Aitchison, Comment on the species and age determination published by Li et al. “Discovery of radiolaria from Upper Cretaceous oceanic red beds in Daba, Kangmar and its paleogeographic implication” [Palaeogeography, Palaeoclimatology, Palaeoecology 312 (2011):127–137], Palaeogeography, Palaeoclimatology, Palaeoecology (2013), http://dx.doi.org/10.1016/j.palaeo.2013.04.002 .) make a number of strident criticisms that attempt to cast doubt upon the species and age determination we made in that paper. In this paper, we will give a reply to their main comments on our paper.
Taylor J Perron - One of the best experts on this subject based on the ideXlab platform.
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reply to terry j and goff j comment on late cenozoic sea level and the rise of modern rimmed atolls by toomey et al 2016 palaeogeography palaeoclimatology palaeoecology 4 51 73 83
Palaeogeography Palaeoclimatology Palaeoecology, 2017Co-Authors: Michael R. Toomey, Andrew D. Ashton, Maureen E. Raymo, Taylor J PerronAbstract:This paper is not subject to U.S. copyright. The definitive version was published in Palaeogeography, Palaeoclimatology, Palaeoecology 469 (2017): 159-160, doi:10.1016/j.palaeo.2016.11.028.
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late cenozoic sea level and the rise of modern rimmed atolls
Palaeogeography Palaeoclimatology Palaeoecology, 2016Co-Authors: Michael R. Toomey, Andrew D. Ashton, Maureen E. Raymo, Taylor J PerronAbstract:This paper is not subject to U.S. copyright. The definitive version was published in Palaeogeography, Palaeoclimatology, Palaeoecology 451 (2016): 73-83, doi:10.1016/j.palaeo.2016.03.018.