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Inti bumi terbentuk 1-1.5 milyar  tahun yang lalu

Date:

October 7, 2015

Source:

University of Liverpool

Summary:

Ada banyak perkiraan ketika inti bumi terbentuk , tetapi para ilmuwan telah menggunakan data baru yang menunjukkan bahwa inti bumi terbentuk 1-1.5 milyar  tahun yang lalu karena ' membeku ' dari sekitar besi cair inti luar .

............ Inti dalam adalah lapisan terdalam bumi . Ini adalah sebuah bola besi padat hanya lebih besar dari Pluto yang dikelilingi oleh inti luar cair. Inti  adalah tambahan yang relatif baru untuk planet kita dan membangun ketika membentuk adalah topik perdebatan ilmiah yang kuat dengan perkiraan mulai 0.5 -2 milyar  tahun yang lalu ......more

Earth's inner
core was formed 1-1.5 billion years ago

Date:

October 7, 2015

Source:

University of Liverpool

Summary:

There have been many estimates for when the earth's inner core was formed,
but scientists have used new data which indicates that the Earth's inner core
was formed 1-1.5 billion years ago as it 'froze' from the surrounding molten
iron outer core.

........................

There have been many estimates for when the earth's inner core was formed,
but scientists from the University of Liverpool have used new data which
indicates that the Earth's inner core was formed 1 -- 1.5 billion years ago as
it "froze" from the surrounding molten iron outer core.

The inner core is Earth's deepest layer. It is a ball of solid iron just
larger than Pluto which is surrounded by a liquid outer core. The inner core is
a relatively recent addition to our planet and establishing when it was formed
is a topic of vigorous scientific debate with estimates ranging from 0.5
billion to 2 billion years ago

In a new study published in Nature, researchers from the
University's School of Environmental Sciences analysed magnetic records from
ancient igneous rocks and found that there was a sharp increase in the strength
of the Earth's magnetic field between 1 and 1.5 billion years ago.

This increased magnetic field is a likely indication of the first
occurrence of solid iron at Earth's centre and the point in Earth's history at
which the solid inner core first started to "freeze" out from the
cooling molten outer core.

Liverpool palaeomagnetism expert and the study's lead author, Dr Andy
Biggin, said: "This finding could change our understanding of the Earth's
interior and its history."

"The timing of the first appearance of solid iron or
"nucleation" of the inner core is highly controversial but is crucial
for determining the properties and history of the Earth's interior and has
strong implications for how the Earth's magnetic field -- which acts as a
shield against harmful radiation from the sun, as well as a useful navigational
aid -- is generated.

"The results suggest that the Earth's core is cooling down less
quickly than previously thought which has implications for the whole of Earth
Sciences. It also suggests an average growth rate of the solid inner core of
approximately 1mm per year which affects our understanding of the Earth's
magnetic field."

The Earth's magnetic field is generated by the motion of the liquid iron
alloy in the outer core, approximately 3,000 km beneath the Earth's crust.
These motions occur because the core is losing heat to the overlying solid
mantle that extends up to the crust on which we live producing the phenomenon
of convection.

Once the inner core started to freeze, this convection received a strong
boost in power because light, non-metallic elements remained molten in the
outer core and were buoyant relative to the overlying liquid. The process
continues today and is thought to be the main source of "fuel" for
generating the Earth's magnetic field.

Dr Biggin added: "The theoretical model which best fits our data
indicates that the core is losing heat more slowly than at any point in the
last 4.5 billion years and that this flow of energy should keep the Earth's
magnetic field going for another billion years or more.

"This contrasts sharply with Mars which had a strong magnetic field
early in its history which then appears to have died after half a billion
years."

The study, published in the journal Nature, is a collaboration
between scientists at the Universities of Liverpool, Helsinki, Michigan Tech,
UC San Diego, and the Chinese Academy of Sciences.







Story Source:

The above post is reprinted from materials provided byUniversity of Liverpool. Note: Materials may be edited for content and length.







Journal Reference:

1.    A. J. Biggin, E. J. Piispa, L. J. Pesonen, R. Holme, G. A. Paterson, T.
Veikkolainen, L. Tauxe. Palaeomagnetic field intensity variations
suggest Mesoproterozoic inner-core nucleation. Nature, 2015;
526 (7572): 245 DOI:10.1038/nature15523

http://www.sciencedaily.com/releases/2015/10/151007135656.htm

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