Geochemical and stratigraphic evidence of environmental change at Lynch's Crater, Queensland, Australia

Muller, Joanne; Wüst, Raphael A.J.; Weiss, Dominik; Hu, Yi Ming

doi:10.1016/j.gloplacha.2006.03.009

Cited by 32 publications

(23 citation statements)

References 27 publications

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“…In organic soils, Ca and Fe contents are not only related to primary input, but can be also caused by post-depositional remobilization. To check this hypothesis, the Ca and Fe data were normalized to Ti, which is considered to be immobile in peat (Weiss et al, 2002;Muller et al, 2006Muller et al, , 2008. The extremely high Ca/Ti and Fe/Ti ratios between 4 and 6 m depth resemble the enrichment levels that are found in peat profiles on the fen-to-bog transition, indicating the change from geogenous (fen) to ombrotrophic (bog) conditions (Gorham and Janssens, 2005).…”

Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

“…However, the paleoenvironmental evolution of tropical and subtropical peatlands has received increased attention (Page et al, 2006;Muller et al, 2008;Dommain et al, 2011). Recent geochemical studies have addressed the origin and distribution of major and trace elements to reconstruct environmental changes (Weiss et al, 2002;Bindler, 2006;Muller et al, 2006;Kylander et al, 2007), and macrofossil remains such as seeds and invertebrates have been useful proxies to reflect the local flora and fauna in mire deposits (Barber et al, 2003;Birks and Birks, 2006).…”

Section: Introductionmentioning

confidence: 99%

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A 70,000 year multiproxy record of climatic and environmental change from Rano Aroi peatland (Easter Island)

Margalef

Cañellas-Boltà

Pla-Rabés

et al. 2013

Global and Planetary Change

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. The Rano Aroi mire on Easter Island (also known as Rapa Nui; 27°09′S, 109°27′W, 430 m above sea level) provides a unique non-marine record in the central South Pacific Ocean for reconstructing Late Pleistocene environmental changes. The results of a multiproxy study on two cores from the center and margin of the Rano Aroi mire, including peat stratigraphy, facies analysis, elemental and isotope geochemistry on bulk organic matter, X-ray fluorescence (XRF) core scanning and macrofossil analysis, were used to infer past water levels and vegetation changes. The chronology was based on 18 14C AMS dates for the upper 8.7 m. The extrapolated age for the base of the sequence is 70 kyr, which implies that this record is the oldest paleolimnological record on Easter Island. The recovered Rano Aroi sequence consists of a radicel peat formed primarily from the remains of sedges, grasses and Polygonaceae that have accumulated since Marine Isotopic Stage (MIS) 4 (70 kyr BP) to the present. From 60 to 40 kyr BP (MIS 3), high precipitation/runoff events were recorded as organic mud facies with lighter δ 13 C, low C/N values and high Ti content, indicating higher detritic input to the mire. A gradual shift in δ 13 C bulk organic matter from −14% to −26%, recorded between 50 and 45 cal kyr BP, suggests a progressive change in local peat-forming vegetation from C4 to C3 plant types. Post-depositional Ca and Fe enrichment during sub-aerial peat exposure and very low sedimentation rates indicate lower water tables during Late MIS 3 (39-31 cal kyr BP). During MIS 2 (27.8-19 cal kyr BP), peat production rates were very low, most likely due to cold temperatures, as reconstructed from other Easter Island records during the Last Glacial Maximum (LGM). Geochemical and macrofossil evidence shows that peat accumulation reactivates at approximately 17.5 cal kyr BP, reaching the highest accumulation rates at 14 cal kyr BP. Peat accretion decreased from 5.0 to 2.5 cal kyr BP, coinciding with a regional Holocene aridity phase. The main hydrological and environmental changes in Rano Aroi reflect variations in the South Pacific Convergence Zone (SPCZ), Southern Westerlies (SW) storm track, and South Pacific Anticyclone (SPA) locations.

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Section: Principal Component Analysis (Pca)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A 70,000 year multiproxy record of climatic and environmental change from Rano Aroi peatland (Easter Island)

Margalef

Cañellas-Boltà

Pla-Rabés

et al. 2013

Global and Planetary Change

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“…The geochemistry of inorganic materials in minerotrophic peat bogs are also believed to be informative proxies for climate and environment changes, even though inorganic materials carried by water flow can conceal materials imported from the atmosphere. Not only human activities (Monna et al, 2004a,b), but also natural climate changes (Kylander et al, 2007;Muller et al, 2006Muller et al, , 2008 can be reflected in the elemental and isotopic compositions of the inorganic materials in minerotrophic peat bogs.…”

Section: Introductionmentioning

confidence: 99%

Major and trace elements of a peat core from Yunnan, Southwest China: Implications for paleoclimatic proxies

Wei

Xie

Sun

et al. 2012

Journal of Asian Earth Sciences

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“…Manganese (Mn) and iron (Fe) are also of lithogenic origin, but contents further depend on environmental factors that control post-depositional processes. By contrast, Ti is considered to be immobile in peat (Muller et al, 2006(Muller et al, , 2008. Therefore, the Mn and Fe data were normalised to Ti to better reflect the variations in autochthonous in-peatland dynamics of the record.…”

Section: Geochemical Variability Of the Recordmentioning

confidence: 99%

Holocene environmental changes in the highlands of the southern Peruvian Andes (14° S) and their impact on pre-Columbian cultures

et al. 2015

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Abstract. High-altitude peatlands of the Andes still remain relatively unexploited although they offer an excellent opportunity for well-dated palaeoenvironmental records.To improve knowledge about climatic and environmental changes in the western Andes of southern Peru, we present a high-resolution record of the Cerro Llamoca peatland for the last 8600 years. The 10.5 m long core consists of peat and intercalated sediment layers and was examined for all kinds of microfossils. We chose homogeneous peat sections for pollen analysis at decadal to centennial resolution. The inorganic geochemistry was analysed in 2 mm resolution (corresponding > 2 years) using an ITRAX X-ray fluorescence core scanner.We interpret phases of relatively high abundances of Poaceae pollen in our record as an expansion of Andean grasslands during humid phases. Drier conditions are indicated by a significant decrease of Poaceae pollen and higher abundances of Asteraceae pollen. The results are substantiated by changes in arsenic contents and manganese/iron ratios, which turned out to be applicable proxies for in situ palaeoredox conditions.The mid-Holocene period of 8.6-5.6 ka is characterised by a series of episodic dry spells alternating with spells that are more humid. After a pronounced dry period at 4.6-4.2 ka, conditions generally shifted towards a more humid climate. We stress a humid/relatively stable interval between 1.8 and 1.2 ka, which coincides with the florescence of the Nasca culture in the Andean foothills. An abrupt turn to a sustained dry period occurs at 1.2 ka, which is contemporaneous with the demise of the Nasca/Wari society in the Palpa lowlands. Markedly drier conditions prevail until 0.75 ka, providing evidence of the presence of a Medieval Climate Anomaly. Moister but hydrologically highly variable conditions prevailed again after 0.75 ka, which allowed re-expansion of tussock grasses in the highlands, increased discharge into the Andean foreland and resettling of the lowlands during this so-called late Intermediate Period (LIP).On a supraregional scale, our findings can ideally be linked to and proved by the archaeological chronology of the Nasca-Palpa region as well as other high-resolution marine and terrestrial palaeoenvironmental records. Our findings show that hydrological fluctuations, triggered by the changing intensity of the monsoonal tropical summer rains emerging from the Amazon Basin in the north-east, have controlled the climate in the study area.

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Geochemical and stratigraphic evidence of environmental change at Lynch's Crater, Queensland, Australia

Cited by 32 publications

References 27 publications

A 70,000 year multiproxy record of climatic and environmental change from Rano Aroi peatland (Easter Island)

A 70,000 year multiproxy record of climatic and environmental change from Rano Aroi peatland (Easter Island)

Major and trace elements of a peat core from Yunnan, Southwest China: Implications for paleoclimatic proxies

Holocene environmental changes in the highlands of the southern Peruvian Andes (14° S) and their impact on pre-Columbian cultures

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