Around 6.67 kg gold was extracted which was moulded into 19 bars
Customs officials have seized gold worth Rs 2.95 crore, concealed inside body shapers being carried by three passengers, at Delhi airport, an official statement issued on Tuesday said.
The accused were intercepted after they arrived from Sharjah on October 28.
The detailed examination of the baggage and personal search of the passengers resulted in the recovery of seven rectangular-shaped pouches containing chemical paste, appearing to be gold and weighing 7.76 kg in total, which was concealed in the pockets of the body shapers belt kept in the handbag, it said.
Around 6.67 kg gold was extracted from this paste which was moulded into 19 uneven rectangular-shaped bars of gold having a value of Rs 2.95 crore, said the statement issued by the customs.
The gold has been seized and the passengers have been arrested, it said, without sharing further details of the accused.
(Except for the headline, this story has not been edited by NDTV staff and is published from a syndicated feed.)
The amount of oxygen in the Earths atmosphere makes it a habitable planet. (Representational)
The amount of oxygen in the Earth’s atmosphere makes it a habitable planet.
Twenty-one per cent of the atmosphere consists of this life-giving element. But in the deep past — as far back as the Neoarchean era 2.8 to 2.5 billion years ago — this oxygen was almost absent.
So, how did Earth’s atmosphere become oxygenated?
Our research, published in Nature Geoscience, adds a tantalizing new possibility: that at least some of the Earth’s early oxygen came from a tectonic source via the movement and destruction of the Earth’s crust.
The Archean Earth
The Archean eon represents one third of our planet’s history, from 2.5 billion years ago to four billion years ago.
This alien Earth was a water-world, covered in green oceans, shrouded in a methane haze and completely lacking multi-cellular life. Another alien aspect of this world was the nature of its tectonic activity.
On modern Earth, the dominant tectonic activity is called plate tectonics, where oceanic crust — the outermost layer of the Earth under the oceans — sinks into the Earth’s mantle (the area between the Earth’s crust and its core) at points of convergence called subduction zones. However, there is considerable debate over whether plate tectonics operated back in the Archean era.
One feature of modern subduction zones is their association with oxidized magmas. These magmas are formed when oxidized sediments and bottom waters — cold, dense water near the ocean floor — are introduced into the Earth’s mantle. This produces magmas with high oxygen and water contents.
Our research aimed to test whether the absence of oxidized materials in Archean bottom waters and sediments could prevent the formation of oxidized magmas. The identification of such magmas in Neoarchean magmatic rocks could provide evidence that subduction and plate tectonics occurred 2.7 billion years ago.
We collected samples of 2750- to 2670-million-year-old granitoid rocks from across the Abitibi-Wawa subprovince of the Superior Province — the largest preserved Archean continent stretching over 2000 km from Winnipeg, Manitoba to far-eastern Quebec. This allowed us to investigate the level of oxidation of magmas generated across the Neoarchean era.
So, we decided to look at the mineral apatite which is present in the zircon crystals in these rocks. Zircon crystals can withstand the intense temperatures and pressures of the post-crystallization events. They retain clues about the environments in which they were originally formed and provide precise ages for the rocks themselves.
Small apatite crystals that are less than 30 microns wide — the size of a human skin cell — are trapped in the zircon crystals. They contain sulfur. By measuring the amount of sulfur in apatite, we can establish whether the apatite grew from an oxidized magma.
We were able to successfully measure the oxygen fugacity of the original Archean magma — which is essentially the amount of free oxygen in it — using a specialized technique called X-ray Absorption Near Edge Structure Spectroscopy (S-XANES) at the Advanced Photon Source synchrotron at Argonne National Laboratory in Illinois.
These new findings indicate that oxidized magmas did form in the Neoarchean era 2.7 billion years ago. The data show that the lack of dissolved oxygen in the Archean ocean reservoirs did not prevent the formation of sulfur-rich, oxidized magmas in the subduction zones. The oxygen in these magmas must have come from another source, and was ultimately released into the atmosphere during volcanic eruptions.
We found that the occurrence of these oxidized magmas correlates with major gold mineralization events in the Superior Province and Yilgarn Craton (Western Australia), demonstrating a connection between these oxygen-rich sources and global world-class ore deposit formation.
The implications of these oxidized magmas go beyond the understanding of early Earth geodynamics. Previously, it was thought unlikely that Archean magmas could be oxidized, when the ocean water and ocean floor rocks or sediments were not.
While the exact mechanism is unclear, the occurrence of these magmas suggests that the process of subduction, where ocean water is taken hundreds of kilometres into our planet, generates free oxygen. This then oxidizes the overlying mantle.
As far as we know, the Earth is the only place in the solar system — past or present — with plate tectonics and active subduction. This suggests that this study could partly explain the lack of oxygen and, ultimately, life on the other rocky planets in the future as well.
(Disclosure Statement: David Mole received funding from Canada First Research Excellence Fund (CFREF) and additional federal, provincial, and industry partners as part of the Metal Earth project; a Canadian geoscience research program led by Laurentian University. The $104-million dollar project started in 2016, and is transforming our understanding of the genesis of base and precious metal deposits during Earth’s evolution. This initiative has created a strategic consortium of allied Canadian and international researchers, government, and industry. The Metal Earth grant project # is CFREF-2015-00005. David currently works for Geoscience Australia, who were not involved in this work.
Adam C. Simon received funding from the U.S. National Science Foundation EAR grants #2214119 and 1924142.
Xuyang Meng receives funding from Canada First Research Excellence Fund (CFREF-2015-00005), Natural Science Foundation of China, U.S. National Science Foundation EAR, and a doctoral scholarship from China Scholarship Council)
(This story has not been edited by NDTV staff and is auto-generated from a syndicated feed.)
Featured Video Of The Day
Ahead Of Gujarat Phase 1 Polling, A Voter Vibe Check