Geochemistry of late quaternary sediments from Tecocomulco lake, central Mexico: Implication to chemical weathering and provenance

Roy, Priyadarsi D.; Caballero, Margarita; Lozano, Rufino; Smykatz-Kloss, Werner

doi:10.1016/j.chemer.2008.04.001

Cited by 96 publications

(43 citation statements)

References 25 publications

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“…3E). The K/Al ratio provides information about the weathering degree of the sediment because labile K is preferentially leached from aluminosilicates compared with insoluble Al during chemical weathering (38). As a consequence of declining erosion rates, chemical weathering in soils had a stronger relative imprint on the minerogenic matter deposited at the lake bottom.…”

Section: Significancementioning

confidence: 99%

Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring

Meyer-Jacob

Tolu

Bigler

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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Organic carbon concentrations have increased in surface waters across parts of Europe and North America during the past decades, but the main drivers causing this phenomenon are still debated. A lack of observations beyond the last few decades inhibits a better mechanistic understanding of this process and thus a reliable prediction of future changes. Here we present past lake-water organic carbon trends inferred from sediment records across central Sweden that allow us to assess the observed increase on a centennial to millennial time scale. Our data show the recent increase in lake-water carbon but also that this increase was preceded by a landscape-wide, long-term decrease beginning already A.D. 1450-1600. Geochemical and biological proxies reveal that these dynamics coincided with an intensification of human catchment disturbance that decreased over the past century. Catchment disturbance was driven by the expansion and later cessation of widespread summer forest grazing and farming across central Scandinavia. Our findings demonstrate that early land use strongly affected past organic carbon dynamics and suggest that the influence of historical landscape utilization on contemporary changes in lake-water carbon levels has thus far been underestimated. We propose that past changes in land use are also a strong contributing factor in ongoing organic carbon trends in other regions that underwent similar comprehensive changes due to early cultivation and grazing over centuries to millennia.lake-water quality | carbon cycling | land use | Holocene | paleoecology O ver the past three decades, monitoring programs have recorded a widespread increase of organic carbon (OC) concentrations in surface waters in parts of Europe and North America (1-4). OC in lakes and rivers plays a major role in the global carbon cycle by transporting carbon from terrestrial to freshwater and marine environments (5), determining drinking water quality and associated treatment costs (6), and affecting aquatic ecosystem functioning. In aquatic ecosystems, OC influences energy mobilization, light conditions (7), water acidity (8), as well as the transport of metals and pollutants (9). The widespread occurrence of this increase in surface water OC, also referred to as browning or brownification due to an associated increase in color, suggests that regional rather than local factors are the drivers behind this phenomenon, but at present the underlying mechanisms are still controversial.Several hypotheses have been proposed to explain this recent OC increase, from climate change to changes in anthropogenic forcing such as declining atmospheric acid deposition or alterations in landscape utilization. A number of climate-sensitive mechanisms have been suggested to cause an increase in OC export from the terrestrial to the aquatic environment; for example, increased temperatures enhance decomposition rates in organic-rich soils (10) and promote vegetation cover (11). Changes in the amount and timing of precipitation potentially lead to alteration...

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Section: Significancementioning

confidence: 99%

Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring

Meyer-Jacob

Tolu

Bigler

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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“…Our study includes Lake Tecocomulco, where already paleolimnological studies (Caballero, Lozano, Ortega, Urrutia, & Macías, 1999;Roy et al, 2009) have been carried out. Lake Tecocomulco is located in the North-Eastern plains, at an altitude of 2 450masl (Roy, Caballero, Lozano, & SmykatzKloss, 2008) and with an average annual precipitation of 650mm (Roy et al, 2009). -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 Sampling and habitat description: Ostracode samples were collected from ten lakes (five maar lakes, one volcanic-tectonic lake, three natural dams, and one man-made dam) during June 2011 (Fig.…”

Section: Study Sitementioning

confidence: 99%

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Pérez

Lozano‐García

Caballero

2015

RBT

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Abstract:The ostracode fauna of the neartic-neotropical transitional zone has remained poorly known until this study. Ten ostracode species inhabit ten highland lakes (five maar lakes (phreatic/phreato-magmatic explosion origin), one volcanic-tectonic lake, three natural dams and one man-made dam) in East-central Mexico. Surface sediments from the deepest part and the littoral zone from all studied lakes were collected. Environmental variables (pH, temperature, dissolved oxygen, conductivity, TDS) were measured in situ and parallel water samples for chemical analysis were collected for habitat description. Widely distributed species in the study area (≥5 lakes) include Cypridopsis vidua, Darwinula stevensoni and Eucandona cf. patzcuaro. Limnocytherina axalapasco is an endemic species and was collected in three maar lakes and in one man-made dam. Rare species included: Chlamydotheca arcuata?, Fabaeformiscandona acuminata?, Ilyocypris gibba?, Limnocythere friabilis?, Potamocypris smaragdina? and Potamocypris unicaudata?. Highest species richness (6 spp.) was found in the large and shallow Lake Metztitlán (2.6km 2 , 5.5m deep), with the lake water type HCO 3 ->>SO 4 2->Cl ---Ca 2+ >Na + >Mg 2+ . The rest of studied lakes (<63m, <27km 2 ) had not more than three species. For instance, only two ostracode species were collected in Lake Alchichica, which is the largest, deepest and most saline studied maar lake. Rev. Biol. Trop. 63 (2): 401-425. Epub 2015 June 01.

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“…The chemical index of alteration (CIA) is used to quantify the chemical weathering of the rocks, expressing the selective removal of mobile elements such as Na, Ca, and K (Xiong et al, 2010;Roy et al, 2008;Nesbitt and Young, 1982). The CIA values of fresh rocks and minerals are <50 (Nesbitt and Young, 1982 (Fedo et al, 1995;Nesbitt and Young, 1982).…”

Section: Introductionmentioning

confidence: 99%

Geochemistry of Middle Holocene sediments from south Yellow Sea: Implications to provenance and climate change

Versteegh¹,

Song

et al. 2016

J. Earth Sci.

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Geochemistry of late quaternary sediments from Tecocomulco lake, central Mexico: Implication to chemical weathering and provenance

Cited by 96 publications

References 25 publications

Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring

Early land use and centennial scale changes in lake-water organic carbon prior to contemporary monitoring

Ostrácodos no-marinos de lagos en el altiplano este-centro de México

Geochemistry of Middle Holocene sediments from south Yellow Sea: Implications to provenance and climate change

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