HOME >> BIOLOGY >> NEWS
Earlier water on Earth? Oldest rock suggests hospitable young planet

ample) could have occurred during this bombardment, but between cataclysmic events."

Scientists have been searching diligently to find samples of the Earth's oldest rocks. Valley and Peck say such ancient samples are extremely rare because rock is constantly recycled or sinks to the hot mantle of the Earth. Over the great spans of geologic time, there is little surface material that has not been recycled and reprocessed in this way.

The tiny grain of zirconium silicate or zircon found by Wilde in western Australia was embedded in a larger sample containing fragments of material from many different rocks, Valley says. Zircons dated at 4.3 billion years were reported from the same site a decade ago, but the new-found zircon grain is more than 100 million years older than any other known sample, giving scientists a rare window to the earliest period of the Earth.

"This early age restricts theories for the formation of the moon," Valley says. "Perhaps the moon formed earlier than we thought, or by a different process." Another intriguing question is whether or not life may have arisen at that early time. Low temperatures and water are preconditions for life. The earliest known biochemical evidence for life and for a hydrosphere is estimated at 3.85 billion years ago, and the oldest microfossils are 3.5 billion years old.

"It may have been that life evolved and was completely extinguished several times" in catastrophic, meteorite-triggered extinction events well before that, Valley says.


'"/>

Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-8070
National Science Foundation
8-Jan-2001


Page: 1 2 3

Related biology news :

1. Earlier weaning, high-energy diet produce higher quality beef
2. Precursors To Red Blood Cells Form Earlier Than Previously Thought
3. Earlier Human Speech?
4. Brain-Activity Data Clarify Contradictions In Earlier Anxiety Research
5. New Arizona State center brings science to policy on issues of water resources and urban growth
6. Posters highlight water, energy and other natural resource research
7. Wastewater could treat itself, power city
8. Byproduct of water-disinfection process found to be highly toxic
9. Sandia experiments may reduce possibility of future water wars
10. NASA satellites detect glow of plankton in black waters
11. Cleaner water, more efficient electricity among UH chemical research

Post Your Comments:
*Name:
*Comment:
*Email:


(Date:6/6/2019)... ... June 05, 2019 , ... Ziegler, ... financial advisor to Pathologists Bio-Medical Laboratories (PBM) on its recent acquisition by PathGroup. ... platform that provides services to more than one dozen hospitals and surgery centers ...
(Date:6/4/2019)... ... June 04, 2019 , ... Harper was three years old when ... severe elbow dysplasia, which caused painful osteoarthritis in the joints. She was referred ... were heartbroken. , The surgical specialist, Dr. Christopher Eich of Southern California Veterinary ...
(Date:6/3/2019)... ... 2019 , ... Stay on top of current hot topics through free webinars ... all webinars is free, so be sure to register today to save your place! ... to see our upcoming webinars: , CLINICAL TRIALS , June 10 – A ...
Breaking Biology News(10 mins):
(Date:6/11/2019)... ... June 11, 2019 , ... A study ... stem cells (MSC-EV) are able to incorporate into human CD34+ cells, modifying their ... mice, MSC-EVs also increased the cells’ ability to lodge into bone marrow. This ...
(Date:5/31/2019)... ... May 30, 2019 , ... Object Pharma, ... the strategic acquisition of Metabiologics, Inc., a globally recognized leader in the production ... and commercialization rights to a full spectrum of botulinum neurotoxins, as well as ...
(Date:5/15/2019)... ... 16, 2019 , ... Emulsifiers are the magic bullet when ... rely on these ingredients to create stable quality food that can withstand shelf-life ... triggers food formulators to seek out alternatives for starches, gums and chemical emulsifiers. ...
(Date:5/4/2019)... ... May 03, 2019 , ... More than three thousand ... Association, the scientist and ufologist Urandir Fernandes de Oliveira, last Thursday (25), during ... results of some research carried out by the association, in partnership with scientists ...
Breaking Biology Technology:
Cached News: