Natural Acid Rock Drainage Associated with Hydrothermally Altered Terrane in Colorado

Sares, Matthew A.; Kurtz, J.; Bove, Dana J.; Neubert, John T.

doi:10.21000/jasmr06021844

ASMR

2006

DOI: 10.21000/jasmr06021844

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Natural Acid Rock Drainage Associated with Hydrothermally Altered Terrane in Colorado

Matthew A. Sares¹,

J. Kurtz²,

Dana J. Bove³

et al.

Abstract: Introduction Acid mine drainage impacts on water quality from historic mining districts are well documented in Colorado's mountainous areas. It is less well known that natural acid rock drainage (ARD) adversely affects water quality in eleven different headwater areas of the state. The geology of these areas is characterized by hydrothermal alteration, commonly related to volcanic activity, post-volcanic mineralization, or igneous stock emplacement. Areas of Colorado known to exhibit natural acid rock drainage… Show more

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Naturally Occurring Acid Rock Drainage in Colorado’s Lake Creek Watershed

Bird¹,

Sares²,

Peters³

et al. 2005

JASMR

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The Lake Creek watershed in Colorado is an excellent, unique, natural outdoor laboratory for studying naturally occurring acid rock drainage (ARD) and other hydrogeochemical processes involving metal transport and deposition. ARD originates in Peekaboo Gulch, Sayres Gulch, and Sayres Bowl Stream, headwater tributaries of Lake Creek that drain low-grade Cu-Mo hydrothermal systems associated with the Grizzly Peak Caldera, host of an Oligocene, calcalkaline porphyry. The watershed receives no visible contribution of ARD from mining or other anthropogenic disturbances. The pH in Peekaboo Gulch, Sayres Gulch, and Sayres Bowl Stream starts in the 2.5-3.0 range, but is naturally neutralized by freshwater tributaries to Lake Creek and ultimately attains a pH of 7.7 at the confluence with the Arkansas River, 37 kilometers downstream.

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Naturally Occurring Acid Rock Drainage in Colorado’s Lake Creek Watershed

Bird¹,

Sares²,

Peters³

et al. 2005

JASMR

View full text Add to dashboard Cite

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Climate Change Adaptation in Acid Sulfate Landscapes

Lin¹

2012

American Journal of Environmental Sciences

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Oxidation of sulfide minerals produces sulfuric acid and consequently creates Acid Sulfate Landscapes (ASLs), which represent one of the most degraded types of land-surface environments. Although acid sulfate-producing weathering is a naturally occurring process, it is markedly facilitated by human intervention. Mining is by far the dominant anthropogenic cause for the creation of inland acid sulfate footprints while land reclamation in coastal lowlands is the driver for the formation of coastal ASLs. The projected climate change highlights the possibility of an increase in the frequency and severity of extreme weather events such as droughts and heavy rains, which is likely to accelerate the acid generation in some circumstances and increase the frequency and magnitude of acid discharge. Sea level rise as a result of global warming will cause additional problems with the coastal ASLs. This is a review article. The following aspects are covered: (a) the overriding biogeochemical processes leading to acid sulfateproducing weathering, (b) a brief introduction to the inland acid sulfate landscapes, (c) a brief introduction to the coastal acid sulfate landscapes, (d) the likely impacts of climate change on ASLs and (e) the possible measures to combat climate change-induced environmental degradation in the identified key acid sulfate footprints. The projected climate change is like to significantly affect the acid sulfate landscapes in different ways. Appropriate management strategies and cost-effective technologies need to be developed in order to minimize the climate change-induced ecological degradation.

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Natural Acid Rock Drainage Associated with Hydrothermally Altered Terrane in Colorado

Cited by 2 publications

References 0 publications

Naturally Occurring Acid Rock Drainage in Colorado’s Lake Creek Watershed

Naturally Occurring Acid Rock Drainage in Colorado’s Lake Creek Watershed

Climate Change Adaptation in Acid Sulfate Landscapes

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