Featured Research

from universities, journals, and other organizations

Schwertmannite In Wet, Acid, And Oxic Microenvironments Beneath Polar And Polythermal Glaciers

Date:
May 5, 2009
Source:
The Geological Society of America
Summary:
Chemical conditions beneath glaciers are difficult to observe and are usually studied by sampling meltwaters emerging from glacial oulets or drill holes. These waters average chemical signals over a large area and cannot record small-scale spatial and temporal variability.

Chemical conditions beneath glaciers are difficult to observe and are usually studied by sampling meltwaters emerging from glacial oulets or drill holes. These waters average chemical signals over a large area and cannot record small-scale spatial and temporal variability.

Related Articles


By contrast, subglacial sediments contain minute (nanometer-sized) particles of iron oxides that can only have formed in transient geochemical "hotspots." Raiswell et al. have found minute crystals of schwertmannite, an iron hydroxy-sulfate mineral, in glaciers from the Antarctic and Arctic.

Schwertmannite is typically found in acid mine drainage, where it forms by the oxidation of pyrite at low pH. These conditions can also be created in subglacial environments, but only in minute hotspots or "microenvironments."

There, schwertmannite forms rapidly but is very unstable, and its survival requires freezing into ice within 100 years. So, frozen nanoparticle schwertmannite indicates the presence of transient geochemically active microenvironments deep within glacial ice.

The formation, preservation, and delivery of nanoparticles of schwertmannite (and iron oxides) into the Southern Ocean may partially relieve iron-limited photosynthesis and assist in the removal of manmade carbon dioxide from the atmosphere.

This study, "Schwertmannite in wet, acid, and oxic microenvironments beneath polar and polythermal glaciers," by R. Raiswell et al. was published in the May 2009 edition of Geology.


Story Source:

The above story is based on materials provided by The Geological Society of America. Note: Materials may be edited for content and length.


Cite This Page:

The Geological Society of America. "Schwertmannite In Wet, Acid, And Oxic Microenvironments Beneath Polar And Polythermal Glaciers." ScienceDaily. ScienceDaily, 5 May 2009. <www.sciencedaily.com/releases/2009/05/090505061830.htm>.
The Geological Society of America. (2009, May 5). Schwertmannite In Wet, Acid, And Oxic Microenvironments Beneath Polar And Polythermal Glaciers. ScienceDaily. Retrieved November 23, 2014 from www.sciencedaily.com/releases/2009/05/090505061830.htm
The Geological Society of America. "Schwertmannite In Wet, Acid, And Oxic Microenvironments Beneath Polar And Polythermal Glaciers." ScienceDaily. www.sciencedaily.com/releases/2009/05/090505061830.htm (accessed November 23, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Sunday, November 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Ebola-Hit Sierra Leone's Late Cocoa Leaves Bitter Taste

Ebola-Hit Sierra Leone's Late Cocoa Leaves Bitter Taste

AFP (Nov. 23, 2014) The arable district of Kenema in Sierra Leone -- at the centre of the Ebola outbreak in May -- has been under quarantine for three months as the cocoa harvest comes in. Duration: 01:32 Video provided by AFP
Powered by NewsLook.com
NY Gov. on Flood Prep: 'prepared for the Worst'

NY Gov. on Flood Prep: 'prepared for the Worst'

AP (Nov. 23, 2014) First came the big storm. Now comes the big melt for residents of flood-prone areas around Buffalo. New York's governor says officials are preparing for the worst as the temperature is expected to rise and potentially melt several feet of snow. (Nov. 23) Video provided by AP
Powered by NewsLook.com
Anglerfish Rarely Seen In Its Habitat Will Haunt You

Anglerfish Rarely Seen In Its Habitat Will Haunt You

Newsy (Nov. 22, 2014) For the first time Monterey Bay Aquarium recorded a video of the elusive, creepy and rarely seen anglerfish. Video provided by Newsy
Powered by NewsLook.com
Raw: Buffalo Residents Digging Out, Helping out

Raw: Buffalo Residents Digging Out, Helping out

AP (Nov. 22, 2014) Hundreds of volunteers joined a 'shovel brigade' in Buffalo, New York on Saturday, as the city was living up to its nickname, "The City of Good Neighbors." Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins