Brahmand NewsPrevious Article
Brahmand NewsNext Article
Headlines
  • Rajnath approves reform of Indian Army headquarters:-Indian Defence Minister Rajnath Singh has approved the first batch of reforms in the Army including relocation of 206 officers from the Army headquarters, setting up of a separate vigilance cell and forming an umbrella organisation to focus on human rights issues. ...
  • IAF always cautious and alert says Air Chief Marshal Dhanoa:-As tensions continue between India and Pakistan over the abrogation of special status to Jammu and Kashmir, Air Chief Marshal B S Dhanoa has said the Indian Air Force (IAF) is "always cautious and alert" to check any untoward aerial movement on the border....
  • Chandrayaan-2 placed in Lunar orbit, focus now on soft-landing:- India's Chandrayaan-2 mission, aimed at soft landing a rover in the unexplored south pole of the Moon, achieved a major milestone as the ISRO successfully injected the spacecraft into the lunar orbit on Tuesday. ...
  • Chandrayaan 2 successfully enters orbit around Moon:-In a major milestone for India's Moon mission, the Chandrayaan-2 spacecraft successfully entered the lunar orbit on Tuesday. Lunar Orbit Insertion (LOI) maneuver was completed successfully at 0902 hours as planned, using the onboard propulsion system, the Bengaluru headquartered space agency said in a statement....

NASA's Curiosity rover spots mineral veins on Mars

Line Spacing+- AFont Size+- Print This Article

This March 18, 2015, view from the Mast Camera on NASA's Curiosity Mars rover shows a network of two-tone mineral veins at an area called "Garden City" on lower Mount Sharp. Photo: NASA/JPL-Caltech/MSSS.

WASHINGTON (PTI): NASA's Curiosity rover has found mineral veins at a site on Mars, offering clues about multiple episodes of fluid movement in the area.

The mineral veins were found at the site called "Garden City" on the slopes of a 5-km-high mountain known as Mount Sharp.

They appear as a network of ridges left standing above the now eroded-away bedrock in which they formed.

Individual ridges range up to about 2.5 inches high and half that in width, and they bear both bright and dark material.

"Some of them look like ice-cream sandwiches: dark on both edges and white in the middle," said Linda Kah, a Curiosity science-team member at the University of Tennessee, Knoxville.

"These materials tell us about secondary fluids that were transported through the region after the host rock formed," she said.

Veins such as these form where fluids move through cracked rock and deposit minerals in the fractures, often affecting the chemistry of the rock surrounding the fractures.

Curiosity has found bright veins composed of calcium sulfate at several previous locations. The dark material preserved here presents an opportunity to learn more.

"At least two secondary fluids have left evidence here.

We want to understand the chemistry of the different fluids that were here and the sequence of events. How have later fluids affected the host rock?" Kah said.

Mud that formed lake-bed mudstones Curiosity examined near its 2012 landing site and after reaching Mount Sharp must have dried and hardened before the fractures formed.

The dark material that lines the fracture walls reflects an earlier episode of fluid flow than the white, calcium-sulfate-rich veins do, although both flows occurred after the cracks formed.

Garden City is about 39 feet higher than the bottom edge of the "Pahrump Hills" outcrop of the bedrock forming the basal layer of Mount Sharp, at the centre of Mars' Gale Crater.

The Curiosity mission spent about six months examining the first 33 feet of elevation at Pahrump Hills, climbing from the lower edge to higher sections three times to vertically profile the rock structures and chemistry, and to select the best targets for drilling.

Analysis is still preliminary, but the three drilled samples from Pahrump Hills have clear differences in mineral ingredients.

The first, "Confidence Hills," had the most clay minerals and hematite, both of which commonly form under wet conditions. The second, "Mojave," had the most jarosite, an oxidised mineral containing iron and sulfur that forms in acidic conditions. The third is "Telegraph Peak."

Examination of Garden City has not included drilling a sample.

Tags:

NASA  Curiosity  Mars  
Line Spacing+- AFont Size+- Print Article

Other Related News

China congratulates India on Chandrayaan-2; Wants to work together for outer space exploration

China has congratulated India on the successful launch of the Chandrayaan-2 and expressed its desire to work with New Delhi for outer space exploration as both countries have stepped up their space programmes including plans to build their own space stations.

Upcoming Defence Exhibitions

BRAHMOS Missile Systems

Headlines

Brahmand World Defence Update 2019

Image Gallery